Greater Sydney in December 2017: a warm start to summer

December rainfall was average to below average in the Sydney region, with more rainy days than average for December. A heatwave in the middle of the month resulted in above average mean daytime and overnight temperatures throughout Sydney.

Average rainfall totals across the city

  • Rainfall totals were average to below average in Greater Sydney during December, with more rain days than the December average
  • Total rainfall for Sydney (Observatory Hill) was 47.2 mm, 61% of the long-term December average of 77.5 mm
  • Rain fell on 16 days at Observatory Hill, above the December average of 12 days, but only one day received more than 10 mm, less than average of two days
  • A similar pattern occurred in the west: Richmond received a total of 46.6 mm over 16 rain days, a slightly below average rainfall total, but more than the December average of ten rain days
  • The heaviest falls came at the start of the month, when an extensive cloud band with embedded thunderstorms crossed the city on the 3rd; falls in excess of 10 mm were recorded throughout Greater Sydney, and showers continued for several days

First heatwave of the summer

  • The mean daily maximum temperature for Sydney (Observatory Hill) was 27.8 °C, which was 2.6 °C above the long-term average of 25.2 °C and the fifth-warmest December on record
  • Daytime temperatures were very much warmer than average across the city, with mean maximum temperatures for the month up to 4.0 °C above average at Penrith Lakes
  • Low intensity heatwave conditions in Sydney began on the 12th and continued for several days, reaching severe status by the 18th; during the heat in the middle of the month, several sites had their highest December day on record
  • A number of sites in the western suburbs had their warmest mean December days on record, and only six days failed to reach 25 °C or higher at Observatory Hill, the lowest number of days since 2005
  • Overnight temperatures were also warmer than average; the mean daily minimum temperature for Sydney (Observatory Hill) was 19.9 °C, which was 2.4 °C above the long-term average of 17.5 °C and the second warmest on record behind 2016
  • At 9am on the 20th, Sydney (Observatory Hill) had already reached 35.3 °C, the second-highest 9am temperature on record at the site (after 36.5 °C on 18 January 2017)
  • Numerous sites around Greater Sydney exceeded their December records for the number of consecutive warm nights of 20 °C or above, including Sydney (Observatory Hill) with 11 consecutive nights (14th to 24th, previous December record was seven such nights in December 1990)
  • Several sites had their highest December mean daily minimum temperature on record for the month, or their warmest December night (highest daily minimum temperature) on record on the 20th

Further information

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Extremes in December 2017
Hottest day 44.1 °C at Penrith Lakes AWS on the 19th
Warmest days on average 33.4 °C at Penrith Lakes AWS
Coolest days on average 24.3 °C at Sydney Harbour (Wedding Cake West)
Coldest day 12.8 °C at Katoomba (Murri St) on the 25th
Coldest night 7.8 °C at Mount Boyce AWS on the 4th
Coolest nights on average 13.9 °C at Mount Boyce AWS
Warmest nights on average 19.9 °C at Sydney (Observatory Hill)
Warmest night 26.2 °C at Mangrove Mountain AWS on the 20th
Warmest on average overall 26.1 °C at Penrith Lakes AWS
Coolest on average overall 19.3 °C at Mount Boyce AWS
Wettest overall 148.8 mm at Mount Wilson (Clarine)
Driest overall 25.0 mm at Camden Airport AWS
Wettest day 39.0 mm at Mount Wilson (Clarine) on the 6th
Strongest wind gust 93 km/h at Wattamolla AWS on the 5th



Record highest December temperature
New record
(°C)
Old
record
Years of
record
Average for
December
Mangrove Mountain AWS 40.8 on the 20th 40.1 on the 21st in 1994 24 26.2
Badgerys Creek AWS 42.7 on the 19th 42.5 on the 17th in 2009 23 28.4
Canterbury Racecourse AWS 40.6 on the 24th 40.3 on the 1st in 2004 23 26.5
Penrith Lakes AWS 44.1 on the 19th 42.3 on the 17th in 2009 23 29.4
Horsley Park Equestrian Centre AWS 42.6 on the 14th 41.9 on the 17th in 2009 21 28.2



Record highest December mean daily maximum temperature
New record
(°C)
Old
record
Years of
record
Average for
December
Bankstown Airport AWS 30.7 30.4 in 2005 49 27.4
Richmond RAAF 32.6 32.2 in 2005 24 28.7
Penrith Lakes AWS 33.4 32.7 in 2005 22 29.4
Horsley Park Equestrian Centre AWS 31.6 31.4 in 2005 20 28.2

Highest December mean daily maximum temperature for at least 20 years
Observed
(°C)
Most recent
higher
Average for
December
Camden Airport AWS 31.8 32.2 in 1990* 28.5

* note: there are gaps in the historical record at this site, so it is possible a higher value has gone unreported




Record highest December daily minimum temperature
New record
(°C)
Old
record
Years of
record
Average for
December
Katoomba (Murri St) 23.4 on the 20th 23.2 on the 23rd in 2013 55 11.7
Prospect Reservoir 25.5 on the 20th 25.3 on the 23rd in 2000 51 16.4
Mangrove Mountain AWS 26.2 on the 20th 24.7 on the 14th in 2016 24 15.4
Penrith Lakes AWS 25.3 on the 20th 24.7 on the 31st in 2016 23 17.0
Horsley Park Equestrian Centre AWS 25.0 on the 20th 24.5 on the 14th in 2016 21 16.2



Record highest December mean daily minimum temperature
New record
(°C)
Old
record
Years of
record
Average for
December
Katoomba (Murri St) 14.7 14.3 in 2016 89 11.7
Camden Airport AWS 17.6 17.0 in 2016 41 15.2
Mount Boyce AWS 13.9 13.6 in 2016 26 11.5
Mangrove Mountain AWS 17.1 16.8 in 1997 23 15.4
Badgerys Creek AWS 17.7 17.6 in 2016 22 15.4
Canterbury Racecourse AWS 18.5 18.4 in 2016 22 16.8
Horsley Park Equestrian Centre AWS 17.9 17.6 in 2016 20 16.2

Highest December mean daily minimum temperature for at least 20 years
Observed
(°C)
Most recent
higher
Average for
December
Bankstown Airport AWS 18.6 18.9 in 1990 16.7
Prospect Reservoir 18.4 20.5 in 1990 16.4



Record highest December mean temperature
New record
(°C)
Old
record
Years of
record
Average for
December
Bankstown Airport AWS 24.7 24.6 in 1990 49 22.0
Camden Airport AWS 24.7 24.4 in 1990 41 21.8
Richmond RAAF 25.3 25.0 in 2016 24 22.4
Mangrove Mountain AWS 23.2 = 23.2 in 2016 23 20.8
Canterbury Racecourse AWS 23.9 23.6 in 2016 22 21.6
Penrith Lakes AWS 26.1 25.5 in 2016 22 23.2
Horsley Park Equestrian Centre AWS 24.8 24.2 in 2016 20 22.2

Highest December mean temperature for at least 20 years
Observed
(°C)
Most recent
higher
Average for
December
Parramatta North (Masons Drive) 24.2 24.3 in 1990 21.9
Sydney Airport AMO 24.5 24.6 in 1990 21.7



Summary statistics for December 2017
Maximum temperatures
(°C)
Minimum temperatures
(°C)
Rainfall
(millimetres)
Mean for
December
2017
Diff
from
average
Highest for
December
2017
Mean for
December
2017
Diff
from
average
Lowest for
December
2017
Total for
December
2017
Average
for
December
Rank of
December
2017
Fraction of
December
average
Badgerys Creek AWS 31.8 +3.4 42.7 19th 17.7 +2.3 13.5 7th 31.2 57.1 average 55%
Bankstown Airport AWS 30.7 +3.3 42.6 24th 18.6 +1.9 14.5 10th 46.0 67.5 average 68%
Camden Airport AWS 31.8 +3.3 42.4 14th 17.6 +2.4 11.5 7th 25.0 56.4 low 44%
Campbelltown (Mount Annan) 31.3 +3.4 41.5 14th 17.1 +1.9 11.7 7th 32.2 54.8 low 59%
Canterbury Racecourse AWS 29.2 +2.7 40.6 24th 18.5 +1.7 13.5 7th 60.4 64.6 average 93%
Cooranbong (Lake Macquarie AWS) 29.4   41.5 20th 17.3   12.1 7th 52.0 85.6 low 61%
Gosford AWS 28.8   40.5 24th 18.7   14.3 10th 61.8
Holsworthy Aerodrome AWS 30.3   41.7 14th 17.6   12.7 10th 37.4
Horsley Park Equestrian Centre AWS 31.6 +3.4 42.6 14th 17.9 +1.7 13.4 10th 37.8 63.3 low 60%
Katoomba (Murri St) 24.4 +2.0 33.8 19th 14.7 +3.0 8.8 4th 88.8 122.4 average 73%
Mangrove Mountain AWS 29.3 +3.1 40.8 20th 17.1 +1.7 12.6 10th 88.6 88.8 average 100%
Mount Boyce AWS 24.7 +2.3 33.0 19th 13.9 +2.4 7.8 4th 69.6 84.6 average 82%
Norah Head AWS 26.5 +1.6 33.7 30th 19.1 +0.7 16.1 3rd 82.6 68.7 average 120%
Parramatta North (Masons Drive) 30.8 +3.3 41.8 19th 17.5 +1.2 12.2 10th 46.2 73.1 average 63%
Penrith Lakes AWS 33.4 +4.0 44.1 19th 18.7 +1.7 14.6 7th 50.6 62.0 average 82%
Prospect Reservoir     42.3 19th 18.4 +2.0 13.6 10th 46.8 75.9 average 62%
Richmond RAAF 32.6 +3.9 42.9 19th 18.0 +1.9 13.7 10th 46.6 68.6 low 68%
Sydney (Observatory Hill) 27.8 +2.6 38.3 20th 19.9 +2.4 16.0 5th 47.2 77.5 average 61%
Sydney Airport AMO 29.3 +3.5 41.6 24th 19.6 +2.0 15.5 5th 52.0 73.6 average 71%
Sydney Harbour (Wedding Cake West) 24.3 +0.8 33.2 30th 19.7 +0.9 15.6 5th
Sydney Olympic Park AWS (Archery Centre) 30.2   41.0 14th 19.0   15.0 10th 46.0
Terrey Hills AWS 28.2 +2.9 39.4 24th 18.2 +1.6 14.6 5th

Daily maximum temperatures for December 2017
12345678910111213141516171819202122232425262728293031
Badgerys Creek AWS34.929.428.819.826.226.333.230.526.829.832.032.436.941.826.637.829.934.242.741.724.728.237.241.421.522.728.034.739.637.229.4
Bankstown Airport AWS31.830.929.522.125.126.233.330.326.227.429.329.532.841.726.634.827.832.538.440.024.627.934.642.622.724.128.231.335.737.327.8
Camden Airport AWS33.831.327.921.324.925.732.329.827.429.832.131.837.842.426.437.928.935.441.940.324.928.937.240.421.422.429.335.439.336.929.2
Campbelltown (Mount Annan)33.128.928.220.525.326.031.930.326.929.231.530.935.741.526.437.629.034.640.039.825.828.537.339.321.222.529.134.038.436.629.1
Canterbury Racecourse AWS29.830.728.818.723.726.131.629.924.625.627.527.729.839.226.833.925.930.334.439.523.927.431.940.621.623.727.029.633.035.627.5
Cooranbong (Lake Macquarie AWS)30.030.328.521.125.027.033.029.024.625.426.726.729.838.729.930.630.429.738.041.523.425.731.040.021.724.425.828.531.636.125.8
Gosford AWS28.830.127.919.124.026.131.828.323.624.826.326.430.438.226.931.027.629.136.139.623.125.930.040.521.924.426.429.732.136.225.9
Holsworthy Aerodrome AWS31.730.128.919.824.625.332.930.325.527.429.329.533.041.726.035.527.031.337.640.424.127.335.240.021.723.028.232.335.436.926.5
Horsley Park Equestrian Centre AWS34.729.328.820.224.725.633.131.627.229.431.731.936.442.627.237.629.434.841.841.023.828.436.341.020.622.928.433.838.736.828.7
Katoomba (Murri St)26.820.018.613.618.017.624.024.220.424.126.226.131.132.423.032.026.231.233.831.616.422.730.231.312.813.920.427.229.726.623.7
Mangrove Mountain AWS31.128.127.417.023.426.031.029.923.125.328.027.533.539.728.435.030.232.538.840.820.325.232.739.519.822.324.931.036.433.925.3
Mount Boyce AWS27.819.517.516.318.816.624.223.322.225.126.928.829.931.723.231.328.430.233.030.416.524.129.231.213.114.622.528.329.826.025.5
Norah Head AWS26.524.926.919.321.826.431.826.924.924.827.127.127.926.523.926.626.228.028.530.322.825.128.229.621.924.226.628.428.733.727.4
Parramatta North (Masons Drive)31.031.229.019.225.025.733.031.225.528.229.829.734.241.727.235.028.533.041.841.223.827.235.240.621.424.328.033.036.037.227.5
Penrith Lakes AWS37.431.030.121.527.827.734.433.028.631.434.234.539.843.528.939.932.935.944.143.623.729.437.842.121.623.830.036.440.438.231.8
Prospect Reservoir34.330.029.619.824.826.132.631.527.029.631.535.741.528.137.228.635.342.341.524.828.036.741.0
Richmond RAAF36.529.729.420.427.327.233.532.027.130.032.933.538.342.130.039.331.834.742.942.523.829.637.542.521.022.729.336.539.337.630.6
Springwood (Valley Heights)33.627.026.618.324.424.224.730.124.027.730.430.936.940.128.635.541.235.138.925.532.535.734.528.2
Sydney (Observatory Hill)27.526.829.218.625.326.031.327.724.124.826.527.028.030.826.628.526.827.635.338.324.526.128.337.721.723.826.227.428.836.225.3
Sydney Airport AMO30.329.928.818.722.726.432.329.824.726.929.129.030.636.124.831.826.530.334.239.925.228.131.741.622.424.427.729.333.035.727.1
Sydney Harbour (Wedding Cake West)22.221.524.418.021.724.928.423.422.221.722.222.522.527.224.523.523.823.528.731.023.023.226.930.421.422.522.923.525.933.223.6
Sydney Olympic Park AWS (Archery Centre)31.531.129.718.924.926.433.230.425.026.829.229.332.941.026.932.327.431.438.940.923.727.633.440.721.324.428.230.534.436.527.8
Terrey Hills AWS27.929.727.817.123.025.631.628.022.325.726.426.628.938.826.833.126.929.235.439.021.325.130.439.420.521.826.628.632.634.724.9
Values are the maximum temperature, usually in the 24 hours from 9 am on the day indicated,
and typically occurred in the afternoon of that day.
Temperatures coloured according to their difference
from the long-term average for the period
-10.0 -9.0 -8.0 -7.0 -6.0 -5.0 -4.0 -3.0 -2.0 -1.0 0.0 +1.0 +2.0 +3.0 +4.0 +5.0 +6.0 +7.0 +8.0 +9.0 +10.0 °C Grey outline marks highest
and lowest for the period

Daily minimum temperatures for December 2017
12345678910111213141516171819202122232425262728293031
Badgerys Creek AWS18.419.214.815.915.415.513.515.315.813.514.317.416.517.021.320.820.820.220.323.019.619.216.318.216.816.917.414.918.422.119.1
Bankstown Airport AWS18.021.014.916.516.218.014.717.316.214.515.419.717.219.021.321.620.821.320.723.820.119.717.518.818.418.217.716.119.022.321.2
Camden Airport AWS20.319.713.215.415.616.611.514.216.412.717.515.716.320.920.720.720.620.122.119.419.116.616.917.416.417.615.118.122.319.6
Campbelltown (Mount Annan)18.218.713.515.515.616.511.714.815.712.413.516.915.316.220.220.220.220.319.721.918.919.116.317.417.315.917.314.617.721.117.7
Canterbury Racecourse AWS19.319.614.215.515.917.813.518.416.914.415.019.916.919.220.921.421.021.220.622.120.718.617.619.018.418.917.916.118.722.220.9
Cooranbong (Lake Macquarie AWS)16.419.914.314.916.915.012.113.218.412.612.314.614.716.019.818.621.117.819.221.119.820.418.317.118.518.219.413.918.622.821.5
Gosford AWS18.021.415.018.316.817.314.517.918.414.315.118.216.718.421.020.621.421.020.823.219.819.518.419.118.118.018.016.819.322.321.4
Holsworthy Aerodrome AWS18.120.014.016.214.516.513.316.215.412.714.018.215.917.720.420.320.220.720.023.019.718.516.817.217.316.217.616.018.521.617.5
Horsley Park Equestrian Centre AWS17.719.214.715.615.716.316.118.815.513.414.917.416.817.820.920.720.620.020.125.019.719.017.118.116.516.217.015.618.921.419.7
Katoomba (Murri St)15.418.810.08.89.810.112.112.710.211.114.713.217.021.618.417.315.615.719.923.413.614.414.819.611.911.112.213.118.317.714.3
Mangrove Mountain AWS17.121.214.715.314.113.814.716.015.112.613.915.315.218.518.818.619.917.719.826.217.917.817.217.815.915.916.613.619.020.918.3
Mount Boyce AWS14.218.49.07.89.59.710.611.59.99.112.712.716.020.518.716.114.514.819.122.213.213.714.318.111.610.310.912.018.017.113.6
Norah Head AWS19.418.416.117.316.617.017.117.718.517.217.719.119.219.419.519.719.619.920.821.820.020.419.820.519.618.719.319.420.321.721.1
Parramatta North (Masons Drive)17.418.215.815.314.716.816.617.214.512.213.516.316.017.820.520.220.220.019.425.219.619.415.718.016.616.016.214.018.220.819.8
Penrith Lakes AWS20.120.715.515.415.916.414.617.015.914.715.819.218.119.321.821.621.020.322.025.320.619.318.420.116.416.918.416.520.422.020.9
Prospect Reservoir21.015.516.815.116.916.118.515.013.614.717.018.321.221.120.720.820.725.520.418.817.518.717.217.417.015.719.321.820.2
Richmond RAAF17.920.115.015.416.116.114.415.215.613.714.216.916.117.622.021.621.819.421.124.820.918.917.918.516.816.818.514.819.521.919.8
Springwood (Valley Heights)18.219.514.213.614.414.115.118.213.713.114.217.116.119.020.220.220.218.516.714.914.919.221.118.5
Sydney (Observatory Hill)20.119.716.916.116.018.217.521.418.117.318.020.319.320.920.721.421.921.122.325.221.221.220.121.018.519.518.819.221.322.420.1
Sydney Airport AMO20.320.116.415.615.517.817.020.318.117.118.120.420.220.720.320.920.421.221.125.120.519.720.621.418.519.118.519.620.922.220.8
Sydney Harbour (Wedding Cake West)19.918.917.416.315.617.817.920.018.918.118.320.419.420.320.420.721.621.021.822.421.120.820.320.918.519.218.919.821.221.821.1
Sydney Olympic Park AWS (Archery Centre)20.120.315.516.316.318.415.918.416.215.016.019.118.220.121.221.821.421.021.123.320.820.318.819.517.918.218.617.020.022.220.5
Terrey Hills AWS18.419.815.615.014.615.716.819.016.314.715.818.117.018.619.320.119.719.821.125.319.218.718.219.516.217.018.017.319.920.718.6
Values are the minimum temperature, usually in the 24 hours to 9 am on the day indicated,
and typically occurred that morning.
Temperatures coloured according to their difference
from the long-term average for the period
-10.0 -9.0 -8.0 -7.0 -6.0 -5.0 -4.0 -3.0 -2.0 -1.0 0.0 +1.0 +2.0 +3.0 +4.0 +5.0 +6.0 +7.0 +8.0 +9.0 +10.0 °C Grey outline marks highest
and lowest for the period

Daily rainfall for December 2017
12345678910111213141516171819202122232425262728293031
Abbotsbury (Fairfield (City Farm)) - - 12.0 - 4.0 - 1.0 - - - - - - - - 1.0 5.0 - 1.0 - 3.0 4.0 1.0 - - 1.0 2.0 - - 3.0 -
Abbotsford (Blackwall Point Rd) - - 12.0 3.0 11.0 0.2 5.2 - 0.2 - - - - - 0.4 2.5 - 1.0 - - 3.0 - - - - - - - - - 24.0
Audley (Royal National Park) - - 9.0 1.0 7.0 - 3.0 - 1.0 - - - - - - 1.0 2.0 1.0 - - 1.0 1.0 - - - - 3.0 - - 1.0 -
Avalon Beach (Avalon (Palmgrove Rd)) - - 13.2 1.2 8.2 0.2 - - 7.2 - - - - - 3.2















Badgerys Creek AWS - - 9.4 0.6 2.2 - 0.8 - 4.4 - - - - - - 1.8 2.4 - 0.4 - 3.2 4.0 - - - - 1.2 - - 0.8 -
Bankstown Airport AWS - - 11.4 0.8 17.8 2.4 4.2 - 2.2 - - - - - - 1.0 0.2 - - - 1.4 0.4 - - - - 0.6 - - 3.4 0.2
Baulkham Hills Eucalyptus Ct - - 14.5 - 4.0 - 1.0 - 4.0 - - 0.5 - - - 0.5 2.0 - - - 1.0 0.5 9.0 - - 0.5 - - - 4.5 -
Belrose (Evelyn Place) 0.2 - 11.8 0.4 7.2 - 5.0 - 0.6 - - - - - 1.4 0.2 0.2 0.2 - - 9.0 1.2 - - - - 0.2 - - 6.0
Bilpin (Fern Grove) - 12.0 - 4.8 30.0 0.4 - - 10.2 0.4 - - - - - - 0.4 - 1.4 - 1.0 11.0 0.8 - 8.0 7.0 4.8 - - 1.6 1.2
Bilpin Post Office - - - 14.4 5.0 25.0 0.6 - 9.0 - - - - - - - - - 0.8 - 4.4 12.2 - - - - 14.6 - 12.2 5.0 -
Blackheath (Evans Lookout Rd) 4.0
17.8 4.8 14.4 1.0
3.0





1.2 3.8


6.4 5.6 21.2


Blackheath (Wombat Street) - - 20.0 1.0 3.0 17.0 2.0 - 4.0 - - - - - - 1.0 - 2.0 - - - 8.0 2.0 - 4.0 9.0 8.0 - - 6.0 -
Box Hill (McCall Gardens) - - 13.0 1.0 5.0 2.0 - - 1.0 - - - - - - - - - 1.0 - 8.0 10.0 1.0 - - - 3.0 - - 5.0 -
Camden Airport AWS - - 12.2 2.0 3.6 - 2.0 - - - - - - - - 1.0 0.8 - - - - 0.8 - - - 0.6 0.4 - - 1.6 -
Campbelltown (Kentlyn (Georges River Roa 12.0 - 10.0 1.0 10.0 - 4.0 - 2.0 - - - - - - 1.0 1.0 - - - 6.0 - - - - - - - - 2.0 -
Campbelltown (Mount Annan) 0.2 - 10.6 4.4 3.4 - 2.2 - 0.6 - - - - - - 0.6 2.4 0.4 - - 2.6 0.2 3.0 - - - 0.2 - - 1.2 0.2
Canterbury Racecourse AWS - - 12.4 15.6 8.2 - 6.2 - 0.8 - - - - - - 0.8 0.4 - - - 8.8 - - - - - 2.2 - - 5.0 -
Castle Cove (Rosebridge Ave) - - 12.0 2.5 9.0 - 3.0 - - - - - - - 8.0 - - - 3.0 - 13.0 2.0 - - - - - - - 8.5 5.0
Castle Hill (Kathleen Ave) - - 15.8 - 2.8 1.0 - - - - - - - - 0.2 - 0.8 - - - 8.6









Cawdor (Woodburn) - - 8.2 6.4 - - - - - - - - - - - 2.0 1.0 - - - - - - - - 1.6 0.8 - - - -
Chatswood Bowling Club - - 11.0 - 12.0 - 3.0 - - - - - - - 11.0 - - - - - 4.0 1.0 - - - - 1.0 - - 4.0 1.0
Collaroy (Long Reef Golf Club) - - 11.8 - 6.2 - 14.6 - - - - - - - - - - - 2.4 - 7.6 - - - - 2.6 3.4 - - 5.0 0.6
Colo Heights (Mountain Pines) - - 17.0 - - 9.2 3.8 - 3.2 - - - - - - 2.4 0.6 - 2.4 - 4.0 - - - 4.6 3.2 0.6 - - - 1.8
Concord (Brays Rd) 0.8 - 12.0 9.8 21.4 - 5.0 - 0.6 - - - - - - 1.8 0.6 - - - 3.0 - 0.8 - 2.6 - - - - 4.6
Concord Golf Club - - 13.4 9.6 10.6 - 4.6 - - - - - - - - 1.4 - - - - 7.2 - - - 3.2 - - - - 5.2
Cooranbong (Avondale) - - 21.0 - 8.0 - 2.0 - - - - - - - - - - - 7.0 - 2.0 1.0 - - 2.0 5.0 1.0 - - 1.0 -
Cooranbong (Lake Macquarie AWS) - - 19.8 - 8.6 - 2.8 - - - - - - - - 0.2 0.2 - 9.0 - 1.8 1.0 0.2 - 2.2 4.4 0.6 - - 0.8 0.4
Darkes Forest (Kintyre) - - 14.6 - 5.4 - 6.2 - 2.4 - - - - - - 1.6 4.2 1.2 - - 2.6 4.2 0.2 - 3.0 2.8 2.8 0.4 - - -
Douglas Park ( St. Marys Towers) - - 11.3 1.5 3.0 - 2.1 - - - - - - - - 4.6 2.6 0.8 - - - - 0.8 - - - - 0.2 - 0.9 -
Dover Heights (Portland St) - - 9.2 0.2 10.4 0.2 3.0 - - - - - - - 0.2 1.6 1.0 - - - 5.4 - - - 3.6 0.4 3.6 - - 3.8 0.8
Dural (Old Northern Road) - - 16.8 - 3.2 - - - 3.0 - - - - - - - - - 1.8 - 14.2 4.8 - - 1.2 1.8 2.2 - - - 0.6
Erskine Park Reservoir - - 16.0 4.0 1.0 - 1.0 - 1.0 - - - - - - - 1.0 - 3.0 - 4.0 2.0 - - - 1.0 1.0 - - 4.0 -
Faulconbridge (Great Western Hwy) - - 7.0 1.0 7.0 5.0 9.0 - 4.0 - - - - - - - 1.0 - 4.0 - - 8.0 - - 4.0 3.0 9.0 - - 1.0 -
Faulconbridge (St Georges Crescent) - - 7.4 2.4 12.2 7.6 5.0 - 4.6 - - - - - - 0.8 1.2 - 3.4 - 0.4 9.0 - 3.8 - 3.6 8.2 - 0.2 1.4 -
Frenchs Forest (Frenchs Forest Rd) - - 12.0 - 10.0 - 7.0 - 1.0 - - - - - 1.0 - - - 1.0 - 19.0 1.0 - - - - - - - 6.0 1.0
Gosford AWS - - 20.0 8.6 6.0 - 2.2 - 5.8 - - - - - - 0.4 - - - - 9.6 4.4 - - - 2.2 0.6 - - 1.8 0.2
Holsworthy Aerodrome AWS 0.4 - 10.2 0.2 10.0 0.4 1.8 - 1.6 0.2 - - - - - 1.4 1.4 0.2 - - 1.8 0.2 - - 2.2 0.8 1.0 - - 3.4 0.2
Hornsby (Swimming Pool) - - 13.6 - 2.6 - - - 1.4 - - - - - - - 1.4 - 0.2 - 14.2 7.2 - - 0.6 0.6 0.2 - - 4.6 0.4
Horsley Park Equestrian Centre AWS - - 11.4 - 4.2 0.2 0.6 - 0.4 - - - - - - 0.6 1.6 0.2 1.8 0.2 3.4 5.0 1.4 - 0.6 0.4 1.6 0.2 - 3.8 0.2
Katoomba (Murri St) - - 12.4 - 7.4 15.8 1.6 - 5.8 - - - - - - 0.8 4.0 1.0 - - - 5.8 0.6 - 6.4 10.4 8.8 - - 8.0 -
Kurrajong Heights (Bells Line of Road) - - 16.2 0.4 0.6 8.6 2.5 - 25.8 - - - - - - - 0.2 - - - 2.0 17.6 0.2 - 10.4 4.8 - - 0.5 7.4
Lucas Heights (ANSTO) - - 8.2 0.4 4.4 - 4.4 - 1.0 - - - - - - 1.5 - - - - 2.4 0.8 - - - - - - - 2.0 0.4
Macquarie Park (Willandra Village) - - 14.0 1.0 7.8 - 6.0 - 1.6 - - - - 9.2 0.2 0.4 - - 4.0 - 6.6 1.0 - - 1.6 0.2 0.2 - - 4.8 0.6
Mangrove Mountain AWS - - 21.0 0.2 32.6 0.8 0.2 - 9.6 - - - - - - 0.2 0.2 - 5.0 0.2 2.0 4.8 0.2 - 0.6 4.0 0.4 - - 4.6 2.0
Marrickville Golf Club - - 10.0 12.0 11.0 - 5.0 - - - - - - - - - 1.0 - - - 7.0 - - - 1.0 - 2.0 - - 3.0 -
Menangle Bridge (Nepean River) - - 10.0 16.0 2.0 - 34.0 - - - - - - - - 1.0 - - - - - - - - 1.0 - - - - - -
Milperra Bridge (Georges River) - - 7.0 - 16.0 1.0 4.0 - 1.0 - - - - - - - - - - - - - - - - - - - - 1.0 -
Mona Vale Golf Club - - 15.6 - 11.2 - 0.4 - 12.2 0.2 - - - - 0.4 0.2 - - - - 5.2 - 0.2 - - 1.4 - - 0.2 6.8 1.6
Mount Annan Botanic Garden - - 11.8 3.4 4.8 - 2.8 - 0.5 - - - - - - 1.2 2.2 0.5 - - 1.3 1.0 3.0 - - - 0.4 - - 1.4 -
Mount Boyce AWS - - 14.4 - 2.0 15.0 2.0 0.2 4.0 - - - - - - 0.6 0.4 1.6 0.4 - - 4.6 1.0 0.2 3.6 7.6 6.6 0.2 0.2 5.0 -
Mount Wilson (Clarine) - - 18.8 - 5.0 39.0 - - 7.0 - - - - - - 3.0 1.0 1.0 8.4 - 5.8 15.0 - - 6.8 17.0 11.0 0.4 - 8.8 0.8
Norah Head AWS - - 28.0 - 4.8 - 0.4 - 9.2 - 0.2 - - - - 0.4 - - 8.6 - 12.0 - - 0.2 2.4 12.0 0.2 - - 3.2 1.0
North Rocks (Muirfield Golf Club) - - 14.0 - 4.5 - 1.0 - 1.0 - - - - - 2.0 - 1.5 - - - 3.0 0.5 1.5 - 0.5 - - - - 4.5 -
North Ryde Golf Club - - 13.0 1.0 13.0 - 7.0 - - - - - - - 9.0 1.0 - - 4.0 - 4.0 - - - 1.0 - - - - 4.0 -
Palm Beach (Sunrise Road) - - 14.0 0.6 8.0 0.2 0.2 - 8.2 - - - - - 1.0 1.4 - - - - 6.8 0.8 - - 0.6 0.8 - - - 3.6 0.4
Parramatta North (Masons Drive) - - 16.2 0.2 8.4 - 2.0 - 1.2 - - - - - - 2.2 0.4 - 2.8 - 3.2 0.2 4.0 - 0.4 - 0.6 - - 4.4 -
Peakhurst Golf Club - - 10.0 1.0 6.0 - 4.0 - 5.0 - - - - - - 1.0 2.0 - - - 6.0 - - - 1.0 1.0 2.0 - - 3.0 -
Pennant Hills (Yarrara Road) - - 14.4 0.4 5.0 - 0.2 - 0.8 - - - - 4.0 - 1.4 - - - 14.8 4.6 2.2 - 1.0 1.0 0.2 - - 4.6 2.4
Penrith Lakes AWS - - 11.4 - 1.6 2.8 2.8 0.2 3.0 - - - - - - 0.6 0.8 - 5.4 - 6.0 4.6 5.2 - 0.4 0.2 4.2 - - 1.4 -
Picton Council Depot - - - - 14.6 - 2.0 - - - - - - - - - - - 12.4 - 3.0 0.2 - - - - 5.0 - - - -
Prospect Reservoir - - 13.1 0.1 9.0 0.4 - 0.2 2.4 - - - - - - 0.9 1.6 - 1.3 - 6.6 3.0 2.2 - 0.2 - 1.0 - - 4.6 0.2
Putty (The Gibba) - - 19.0 - 1.0 25.0 - - 2.0 - - - - - - 2.0 - - 16.0 - 5.0 5.0 - - 2.0 2.0 - - - 1.0 -
Randwick (Randwick St) - - 11.2 - 19.8 0.2 3.6 - 0.2 - - - - - - 1.4 1.0 - - - 3.4 - 0.2 - 2.4 - 3.0 - - 4.2 4.4
Richmond - UWS Hawkesbury - - 12.8 2.6 4.4 - - - 9.2 - - - - - 0.4 - - 4.4 5.2 - - - 4.0 2.8 - - - 4.2
Richmond RAAF 0.2 - 14.4 0.2 1.0 6.2 0.2 - 7.6 0.2 - - - - - - - - 0.2 - 3.4 5.6 - - 0.6 1.8 1.4 - - 3.2 0.4
Rose Bay (Royal Sydney Golf Club) - - 9.1 - 11.1 - 6.2 - - - - - - - - 1.4 - - - 1.4 5.6 - - - 3.2 0.2 3.4 - - 3.4 6.4
Rossmore (South Creek) - - 7.0 21.0 4.0 - 1.0 - 1.0 - - - - - - 2.0 - - 1.0 - 4.0 2.0 - - - - 1.0 - - 3.0 -
Sans Souci (Public School) - - 9.0 3.0 7.0 - 8.0 - 5.0 - - - - - - 1.0 1.0 - - - 15.0 - - - - - 3.0 - - 2.0 -
Seven Hills (Radio FM 103.2) - - 13.5 - 11.0 0.5 5.0 0.5 5.0 - - - - - - 1.5 1.0 - - - 9.0 4.0 2.5 - - - 1.5 - - 4.0 -
Seven Hills (Collins St)

17.2
9.0


6.0





1.6



7.4 4.2



2.0

4.8
Shanes Park (South Creek Road) - - 20.6 - 3.0 1.0 0.2 - 2.4 0.2 - - - - - 1.2 0.6 0.2 7.6 - 3.6 5.6 - - 0.2 - 1.0 - - 4.4 -
Springwood (Valley Heights) - - 8.8 2.4 1.2 6.4 4.8 - 5.6 - - - - - - 0.8 - 1.2 7.4 13.8 - - 1.2 -
St Ives (Richmond Avenue) - - 11.4 0.8 12.4 - 0.4 - 3.4 - - - - - - - 0.6 - - - 11.0 5.0 2.0 - 0.4 0.4 0.2 - - 5.4 3.0
Sydney (Observatory Hill) 0.2 - 10.8 3.0 7.6 0.2 5.8 - - - - - - - 0.2 1.4 0.6 0.2 - - 3.0 0.2 - - 1.2 - 3.0 - - 3.8 6.0
Sydney Airport AMO - - 10.0 7.6 9.0 - 4.4 0.6 - - - - - - - 0.8 0.6 0.6 - - 7.6 - - 4.4 - 3.6 - - 2.8 -
Sydney Botanic Gardens - - 12.2 1.6 12.2 - 6.6 - 0.8 - - 0.1 - - 0.4 1.4 0.8 - - - 4.4 - - - 2.5 1.5 3.6
4.1 1.8 1.4
Sydney Olympic Park AWS (Archery Centre) - - 12.8 1.0 13.0 - 2.4 - 0.4 - - - - - - 1.8 - - 0.8 - 6.6 - 0.2 - 1.0 0.2 0.8 - - 4.6 0.4
Terrey Hills AWS - - 11.0 - 12.8 0.2 - - 1.6 0.2 - - - -
- - - - - 7.0
0.2 - 0.2 2.8 - 0.2 - 5.0
Turramurra (Kissing Point Road) - - 3.0 - - - - - - 9.2 - - - - 5.4 - 1.0 - - - 18.6 7.2 - - 0.8 2.0 0.2 - - - -
Wahroonga (Ada Avenue) - - 15.8 0.2 6.4 - - - 1.2 - - - - - 1.6 - 1.4 - 0.2 - 18.0 8.8 0.4 - 0.6 2.6 0.2 - - 5.8 0.2
Warragamba - - 6.0 3.0 2.0 2.0 - - 3.0 - - - - - - 1.0 1.0 - - - - 6.0 - - - - 3.0 - - 1.0 -
Wedderburn (Booalbyn) - - 10.0 1.0 3.0 - 9.0 - - - - - - - - - 4.0 - - - - - - - 2.0 - - - - 1.0 -
Wentworth Falls Country Club - 12.0 - 4.4 - - - - - - - - - - 1.0 - 4.0 3.5












Wyong (Jilliby (Jilliby Creek)) - - 17.8 - 5.2 3.0 1.2 - 13.6 - - - - - 0.2 0.6 - - 14.6 - 1.6 3.0 1.2 - 0.2 13.4 - - - 2.8 0.6
Wyong (Kulnura (Jeavons)) - - 25.0 1.0 2.0 8.0 6.0 - 8.0 - - - - - - - - - 5.0 - - 9.0 - - 3.0 13.0 - - - 2.0 1.0
Wyong (Mount Elliot) - - 24.0 1.0 3.0 - 9.0 - 6.0 - - - - - - - - - - - 3.0 9.0 - - - 5.0 - - - 2.0 -
Wyong (Olney Forest) 1.0 - 18.0 - 4.0 7.0 4.0 - 6.0 - - - - - - - - - 12.0 - - 19.0 - - 3.0 8.0 - - - 3.0 3.0
Yarramalong (Lewensbrook) 1.0 - 21.0 1.2 5.8 - - - 14.0 - - - - - - - - 1.0 9.2 - 1.0 5.0 - - 0.4 12.0 - - - 3.0 2.0
Most values are the precipitation in the 24 hours to 9 am on the day indicated. Days marked with → are part of a longer accumulation, which is shown on the final day.
Values over 100 mm have been rounded to the nearest whole millimetre.
Days marked with - have a rainfall report of zero; days left blank have no rainfall report (which often indicates no rain fell).
Rainfalls coloured
according to the amount
0 1.0 5.0 10.0 15.0 25.0 50.0 100 150 200 300 400 600 millimetres

Notes

The Monthly climate summary, generally published on the first working day of each month, lists the main features of the weather in Greater Sydney using the most timely and accurate information available on the date of publication; it will generally not be updated. More extensive discussion of significant weather events, along with later information and data that has had greater opportunity for quality control, will be presented in the Monthly Weather Review.

In September 2017 this summary was broadened to include data from observing sites in or near the Greater Sydney “Greater Capital City Statistical Area” (GCCSA). The Australian Bureau of Statistics designed the GCCSAs to “include the population within the urban area of the city, as well as people who regularly socialise, shop or work within the city, and live in small towns and rural areas surrounding the city. It is important to note that GCCSAs do not define the built up edge of the city. They provide a stable definition for these cities and are designed for the output of a range of social and economic survey data.

This statement has been prepared based on information available at 1 pm on Tuesday 9 January 2018. Some checks have been made on the data, but it is possible that results will change as new information becomes available.

In some situations, some or all of the rainfall is in the form of hail or snow. In these cases the totals given are for the water equivalent: the depth of liquid water that results from melting any frozen precipitation. There can be significant 'undercatch' of snow in strong winds, meaning the true precipitation can be higher than that reported.

Averages for individual sites are long-term means based on observations from all available years of record, which vary widely from site to site. They are not shown for sites with less than 10 years of record, as they cannot then be calculated reliably.
The median is sometimes more representative than the mean of long-term average rain.

The Rank indicates how rainfall this time compares with the climate record for the site, based on the decile ranking (very low rainfall is in decile 1, low in decile 2 or 3, average in decile 4 to 7, high in decile 8 or 9 and very high is in decile 10).
The Fraction of average shows how much rain has fallen this time as a percentage of the long-term mean.

Where temperature area averages are mentioned, they are derived from the ACORN-SAT dataset.

Further information

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