Greater Perth in March 2018: a dry start to autumn

Rainfall was below average for most Perth sites. Mean maximum temperatures were generally near average but mean minimum temperatures were above average.

Below average rainfall for most sites

  • March rainfall was below average for most sites, with monthly totals generally less than 5 mm, reaching 10 mm to 20 mm in the hills
  • Light rainfall was recorded on three or four days in the middle of the month and in late March for most sites

Above average mean minimum temperatures; near average mean maximum temperatures

  • Mean maximum temperatures were near average for most sites
  • Mean minimum temperatures were above average for most sites
  • Days were mostly warm or mild with some hot days; the hottest day was on the 13th with daily maxima over 37 °C for most sites
  • Mornings were generally cool or mild; the warmest morning was on the 6th with daily minima in the mid-20s, whilst daily minima below 10 °C were spotted on the 18th, 28th and 29th

Perth Metro

  • Total rainfall for Perth Metro was 2.6 mm, which was the driest March for six years when a mere 0.2 mm was recorded in March 2012
  • The mean daily maximum temperature for Perth Metro was 29.8 °C, which was 0.2 °C above average, and the warmest March for four years, since a mean maximum of 30.3 °C in March 2014
  • The hottest day was on the 13th with 38.5 °C, which was the highest temperature recorded at Perth Metro for 13 months, since 39.3 °C was recorded on 25 February 2017
  • The mean daily minimum temperature for Perth Metro was 17.7 °C, which was 1.0 °C above average and the mildest March for two years, since a mean minimum of 17.9 °C in March 2016
  • The warmest morning was on the 6th with 25.5 °C, which was the highest minimum for 24 months, since 26.0 °C was recorded on 14 March 2016
  • The coolest morning was on the 28th with 9.4 °C, which was the lowest minimum for six months, since 8.7 °C was recorded on 30 October 2017

Further information

Media
(03) 9669 4057
Enquiries

Extremes in March 2018
Hottest day 38.6 °C at Millendon (Swan Valley) on the 13th
38.6 °C at Pearce RAAF on the 13th
Warmest days on average 31.5 °C at Pearce RAAF
Coolest days on average 26.1 °C at Rottnest Island
27.9 °C at Bickley
27.9 °C at Mandurah
Coldest day 21.0 °C at Karnet on the 27th
Coldest night 5.7 °C at Jandakot Aero on the 18th
Coolest nights on average 15.0 °C at Bickley
Warmest nights on average 19.0 °C at Rottnest Island
18.4 °C at Mandurah
Warmest night 26.0 °C at Millendon (Swan Valley) on the 6th
26.0 °C at Pearce RAAF on the 6th
Warmest on average overall 24.1 °C at Pearce RAAF
Coolest on average overall 21.4 °C at Bickley
Wettest overall 18.8 mm at Mount Solus
Driest overall 0.8 mm at Millendon (Swan Valley)
0.8 mm at Pearce RAAF
Wettest day 9.5 mm at Huntly on the 27th
Strongest wind gust 80 km/h at Bickley on the 26th




Summary statistics for March 2018
Maximum temperatures
(°C)
Minimum temperatures
(°C)
Rainfall
(millimetres)
Mean for
March
2018
Diff
from
average
Highest for
March
2018
Mean for
March
2018
Diff
from
average
Lowest for
March
2018
Total for
March
2018
Average
for
March
Rank of
March
2018
Fraction of
March
average
Bickley 27.9 0.0 35.4 13th 15.0 +0.4 8.4 18th 14.4 26.1 average 55%
Garden Island HSF 26.7 -0.3 37.0 13th 18.9 +0.7 13.3 18th 2.8 15.0 low 19%
Gosnells City 30.6 +0.1 38.5 13th 17.9 +0.7 11.0 28th 4.6 16.7 low 28%
Jandakot Aero 29.8 +0.2 37.6 13th 16.5 +1.1 5.7 18th 3.8 16.3 low 23%
Mandurah 27.9 +0.1 34.7 13th 18.4 +0.3 12.2 18th 3.6 16.4 low 22%
Millendon (Swan Valley) 31.1   38.6 13th 17.0   7.9 28th 0.8
Pearce RAAF 31.5 +1.0 38.6 13th 17.1 +1.1 6.7 28th 0.8 16.7 v low 5%
Perth Airport 30.5 +0.8 38.5 13th 17.1 +1.2 7.3 28th 1.0 16.2 low 6%
Perth Metro 29.8 +0.2 38.5 13th 17.7 +1.0 9.4 28th 2.6 19.7 low 13%
Rottnest Island 26.1 +0.1 35.3 21st 19.0 +0.3 14.0 18th 3.8 18.0 average 21%
Swanbourne 28.1 -0.8 37.7 13th 18.2 +0.8 11.8 18th 4.6 21.2 low 22%

Daily maximum temperatures for March 2018
12345678910111213141516171819202122232425262728293031
Bickley31.927.526.529.433.133.829.730.930.127.930.131.635.427.123.223.621.526.028.930.734.726.427.424.221.221.721.623.628.231.526.4
Garden Island HSF23.422.626.128.534.634.423.223.823.229.233.234.837.026.624.323.321.522.429.834.035.423.325.323.425.124.121.822.022.426.721.9
Gosnells City33.230.032.536.136.931.531.331.231.533.135.138.529.826.727.924.928.831.934.137.427.530.127.125.026.025.025.430.928.928.9
Jandakot Aero31.528.729.632.835.936.528.129.629.031.633.234.637.628.626.125.223.827.631.734.137.126.329.825.925.125.824.224.728.732.927.9
Karnet34.034.827.730.025.530.031.834.030.534.522.521.821.027.025.0
Mandurah27.725.929.332.934.030.024.925.927.229.633.434.334.726.824.724.322.524.732.033.834.525.329.222.525.423.122.722.825.730.924.6
Millendon (Swan Valley)33.729.929.732.736.737.131.532.331.230.833.435.538.630.427.427.424.728.832.234.237.828.331.327.926.327.225.626.030.935.328.6
Pearce RAAF34.530.930.133.235.832.733.732.831.633.935.638.632.227.928.225.429.132.734.737.728.731.528.526.728.726.527.031.735.828.9
Perth Airport33.129.929.632.436.536.730.230.330.431.233.434.938.529.426.626.124.228.532.234.137.726.230.727.525.526.225.225.529.834.127.8
Perth Metro31.627.429.832.335.936.529.129.928.730.933.135.038.529.226.025.823.827.332.033.538.125.229.227.125.825.824.624.628.533.226.5
Rottnest Island24.423.524.626.033.831.124.223.823.629.230.630.634.626.524.123.122.521.825.331.935.323.824.623.624.725.022.422.723.625.722.8
Swanbourne26.424.828.331.336.635.425.325.125.130.933.334.737.727.225.323.822.923.830.933.837.323.625.926.526.125.024.122.924.430.823.3
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 March 2018
12345678910111213141516171819202122232425262728293031
Bickley14.814.412.312.715.320.818.615.615.713.813.715.220.121.018.214.112.98.413.415.420.118.414.514.113.814.413.410.711.413.313.4
Garden Island HSF18.118.316.216.720.324.721.217.320.217.417.820.024.021.020.618.219.313.316.520.322.920.918.818.419.020.417.713.616.017.118.6
Gosnells City15.216.819.923.717.016.716.917.419.122.224.220.916.514.513.414.919.123.521.216.018.418.920.516.511.013.017.816.2
Jandakot Aero14.414.815.216.219.725.620.313.514.616.717.219.023.821.420.315.413.35.711.219.724.018.115.017.718.519.115.97.48.313.015.7
Karnet21.118.213.812.014.019.618.821.017.013.17.512.0
Mandurah17.717.015.716.519.425.121.218.319.417.017.619.122.821.220.317.618.512.215.819.622.520.718.418.218.719.617.012.915.216.118.3
Millendon (Swan Valley)15.013.915.716.520.426.019.814.215.317.417.719.423.622.921.014.513.212.210.720.024.819.915.118.219.020.316.27.98.013.215.2
Pearce RAAF15.114.115.716.820.826.020.714.514.917.317.820.023.822.121.514.613.611.511.920.224.720.014.918.819.919.616.26.77.413.315.1
Perth Airport14.815.715.816.219.725.322.114.016.117.417.418.923.124.021.515.312.812.611.319.524.319.516.217.818.218.916.07.38.614.615.6
Perth Metro14.716.516.016.519.825.521.816.616.817.417.619.023.223.821.316.915.510.512.219.623.420.416.918.118.820.316.69.411.814.117.0
Rottnest Island19.117.916.417.320.523.720.619.019.517.517.720.022.521.420.218.818.314.016.220.823.121.018.818.618.820.317.416.417.517.918.6
Swanbourne15.916.315.717.020.423.820.817.717.117.117.519.623.222.620.717.018.011.816.020.223.921.216.918.319.219.816.412.713.716.117.5
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 March 2018
12345678910111213141516171819202122232425262728293031
Anketell - - - - - - - - - - - - 4.4 0.4 0.4 1.4 - - - -
Bickley - - - - - - - - - - - - - - 4.4 0.2 - - - - - - - - 0.2 1.6 8.0 - - - -
Bungendore - - - - - - - - - - - - - 1.0 4.6 - - - - - - - - - - 1.0 4.8 0.2 - 0.2 -
Chidlow - - - - - - - - - - - - - - - - - - - - - - - - 0.1 1.2



Garden Island HSF - - - - - - - - - - - - - 2.2 0.2 - - - - - - - - - - - 0.4 - - - -
Gidgegannup - - - - - - - - - - - - - - - - - - - - - - - - - 0.2 2.8 - - - -
Gosnells City - - - - - - - - - - - - - - 4.6 - - - - - - - - - - - - - - - -
Huntly - - - - - - - - - - - - - 3.8 0.5 - - - - - - - - - - 2.6 9.5 - - - -
Jandakot Aero - - - - - - - - - - - - - 0.4 2.6 - - - - - - - - - - 0.2 0.6 - - - -
Jarrahdale - 0.2 - - - - - - 0.2 - - - - 3.4 2.4 0.4 - - 0.2 - - - - 0.2 - 2.2 6.6 0.2 - 0.2 -
Karnet - - - - - - - -
- - - - 5.0 - - - - - - - -


3.2 9.2 - - - -
Karragullen North - - - - - - - - - - - - - 5.4 - - - - - - - - - - - 1.6 5.6



Maida Vale - - - - - - - - - - - - - - 2.6 - - - - - - - - - - 2.0




Mandurah - - - - - - - - - - - - - 2.6 - 0.2 - - - - - - - - - - 0.6 0.2 - - -
Midland - - - - - - - - - - - - - - - - - - - - - - - - - - - -


Millendon (Swan Valley) - - - - - - - - - - - - - - - - - - - - - - - - - - 0.8 - - - -
Mount Solus - - - - - - - - - - - - - 6.2 1.6 0.2 - 0.2 - - - - 0.2 - 0.2 2.4 7.4 0.2 - 0.2 -
Muchea - - - - - - - - - - - - - - - - - - - - - - - - 0.2 - 1.4 - - - -
Mundaring - - - - - - - - - - - - - - 0.8 0.2 - - - - - - 0.2 - - 0.6 5.0



Noble Falls

























2.0



Pearce RAAF - - - - - -
- - - - - - - - - - - - - - - - - - - 0.8 - - - -
Perth Airport - - - - - - - - - - - - - - 0.6 - - - - - - - - - - - 0.4 - - - -
Perth Metro - - - - - - - - - - - - - - 1.6 - - - - - - - - - - 0.2 0.8 - - - -
Pinjarra Refinery - - - - - - - - - - - - - 3.8 0.2 - 0.2 - - - - - - - - 1.2 1.4 - - - -
Pinjarra South - - - - - - - - - - - - - 4.0 - - - - - - - - - - - - 1.0 - - - -
Roleystone - - - - - - - - - - - - - 0.6 5.6 - - - - - - - - - - 1.8 4.6



Rottnest Island - - - - - - - - - - - - - 0.8 1.4 - - - - - - -
- 0.2 - 1.4 - - - -
Serpentine - - - - - - - - - - - - - 3.4 1.0 0.2 - - - - - - - - - 1.2 2.2 0.2 - - -
Swanbourne - - - - - - - - - - - - - - 3.0 - - - - - - - - - - 0.6 1.0 - - - -
Wanneroo - - - - - - - - - - - - - - 0.2 - - - - - - - - 0.2 2.0



Werribee - - - - - - - - - - - - - - - - - - - - - - - - - - 1.2 0.2 - - -
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 Perth 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 Perth “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 9 am on Tuesday 3 April 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

Media
(03) 9669 4057
Enquiries