Greater Perth in March 2019: Below average rainfall

Rainfall totals in March 2019 were below the long-term March average for most sites in Greater Perth. Mean mean maximum and minimum temperatures were above average for most sites.

Below average rainfall

  • Monthly rainfall totals were mostly less than 10 mm, up to 15-20 mm for some locations on the Perth hills, with majority of falls recorded on four days between the 7th and 10th
  • Perth Metro recorded measurable daily rainfall (at least 0.2 mm) over five consecutive days on the 7th and 11th, whilst Perth Metro's previous longest wet spell in March was 3 days observed on several occasions

Warm days for most sites

  • Mean maximum temperatures were above average for most sites, but below average at Swanbourne
  • Mean minimum temperatures were above average except for the offshore islands
  • The hottest day was on the 4th with daily maxima in the high 30s to low 40s; the highest temperature was 41.1 °C at Pearce RAAF
  • Perth Metro recorded a daily maximum temperature 39.5 °C on the 4th, which was its highest temperature in March for 3 years when 39.8 °C was recorded on 14 March 2016
  • Warm nights on the 4th, 19th and 21st saw daily minima mostly in the low 20s

Perth Metro

  • Total rainfall for Perth Metro was 6.2 mm, which is 32% of the long-term average of 19.2 mm
  • The mean daily maximum temperature for Perth Metro was 30.1 °C, which is 0.5 °C above the long-term average of 29.6 °C. The warmest day was 39.5 °C on the 4th, and the coolest day was on the 1st when the temperature reached 23.9 °C
  • The mean daily minimum temperature for Perth Metro was 17.3 °C, which is 0.6 °C above the long-term average of 16.7 °C. The coldest morning was 11.0 °C on the 24th, and the warmest morning was on the 21st when the minimum temperature was 21.8 °C

Further information

Media
(03) 9669 4057
Enquiries

Extremes in March 2019
Hottest day 41.1 °C at Pearce RAAF on the 4th
Warmest days on average 32.5 °C at Pearce RAAF
Coolest days on average 26.1 °C at Rottnest Island
27.9 °C at Mandurah
Coldest day 21.7 °C at Garden Island HSF on the 1st
22.2 °C at Bickley on the 1st
Coldest night 7.9 °C at Jandakot Aero on the 2nd
Coolest nights on average 15.0 °C at Bickley
Warmest nights on average 18.5 °C at Rottnest Island
18.1 °C at Garden Island HSF
18.1 °C at Mandurah
Warmest night 23.3 °C at Mandurah on the 19th
Warmest on average overall 24.7 °C at Pearce RAAF
Coolest on average overall 21.8 °C at Bickley
Wettest overall 18.2 mm at Mount Solus
Driest overall 2.8 mm at Pearce RAAF
Wettest day 8.6 mm at Mandurah on the 7th
Strongest wind gust 80 km/h at Rottnest Island on the 22nd

Summary statistics for March 2019
Maximum temperatures
(°C)
Minimum temperatures
(°C)
Rainfall
(millimetres)
Mean for
March
2019
Diff
from
average
Highest for
March
2019
Mean for
March
2019
Diff
from
average
Lowest for
March
2019
Total for
March
2019
Average
for
March
Rank of
March
2019
Fraction of
March
average
Bickley 28.7 +0.8 37.2 4th 15.0 +0.4 9.2 24th 8.0 25.7 low 31%
Garden Island HSF 26.9 -0.1 36.5 4th 18.1 -0.2 13.4 25th 12.2 14.8 average 82%
Gosnells City 31.1 +0.6 40.0 4th 17.4 +0.1 11.5 29th 1.4 16.5 v low 8%
Jandakot Aero 30.2 +0.6 39.7 4th 16.6 +1.1 7.9 2nd 7.4 16.1 average 46%
Mandurah 27.9 +0.1 37.2 4th 18.1 0.0 12.7 24th 17.4 16.5 average 105%
Millendon (Swan Valley) 31.6   40.7 4th 17.0   9.5 2nd 3.8
Pearce RAAF 32.5 +1.9 41.1 4th 16.8 +0.8 10.5 2nd 2.8 16.4 average 17%
Perth Airport 31.0 +1.3 40.4 4th 17.2 +1.3 10.1 2nd 4.4 16.0 low 28%
Perth Metro 30.1 +0.5 39.5 4th 17.3 +0.6 11.0 24th 6.2 19.2 average 32%
Rottnest Island 26.1 +0.1 33.8 31st 18.5 -0.2 13.9 29th 8.8 17.6 average 50%
Swanbourne 28.0 -0.8 39.4 4th 17.8 +0.4 11.8 24th 8.0 20.7 average 39%

Daily maximum temperatures for March 2019
12345678910111213141516171819202122232425262728293031
Bickley22.225.432.837.226.927.123.227.522.529.029.930.028.429.730.630.532.535.233.833.130.525.725.125.625.030.730.324.924.327.832.5
Garden Island HSF21.723.230.436.530.831.323.524.623.323.724.325.027.426.727.925.823.522.528.731.823.122.527.330.935.3
Gosnells City37.427.035.840.030.031.026.030.524.230.132.032.030.033.032.530.534.035.532.029.028.428.534.031.527.527.530.929.5
Jandakot Aero23.925.634.739.730.531.524.529.023.828.731.630.527.931.530.728.233.536.134.031.730.929.227.627.628.333.629.926.727.530.835.7
Karnet36.727.628.523.728.129.527.329.630.330.032.234.534.333.031.725.631.229.823.3
Mandurah22.923.434.337.231.228.923.926.623.927.128.426.824.428.427.527.430.530.927.927.629.927.625.824.628.230.626.824.326.629.731.6
Millendon (Swan Valley)24.827.935.540.731.431.427.130.624.931.632.933.230.033.233.131.135.437.936.735.432.429.527.828.528.534.032.428.627.231.135.8
Pearce RAAF26.429.236.241.132.331.728.230.624.932.634.134.730.833.634.831.635.638.637.536.632.931.928.528.929.335.133.929.627.731.436.7
Perth Airport24.627.136.040.430.430.926.030.324.130.632.632.029.332.331.129.634.037.436.532.731.930.028.226.328.534.331.628.327.331.135.7
Perth Metro23.925.834.739.530.430.625.629.424.029.431.330.827.331.331.028.733.434.834.131.731.728.927.525.328.134.029.627.127.330.735.2
Rottnest Island23.023.127.632.729.231.323.524.822.424.123.124.922.524.326.924.327.029.828.026.228.525.922.822.025.131.523.922.425.628.033.8
Swanbourne23.323.833.839.431.132.025.225.423.525.225.127.823.826.826.925.130.231.127.626.828.629.026.122.928.333.225.225.927.131.136.4
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 2019
12345678910111213141516171819202122232425262728293031
Bickley15.110.113.719.116.013.615.917.719.817.815.713.913.914.215.414.816.218.019.719.519.417.210.99.29.412.018.511.910.010.215.9
Garden Island HSF18.614.916.921.119.718.020.320.420.820.418.118.617.220.521.820.914.813.813.418.019.616.513.714.618.9
Gosnells City12.016.122.119.017.619.019.521.720.119.217.518.020.017.016.417.622.020.019.513.912.513.014.516.515.011.517.917.9
Jandakot Aero18.17.912.721.119.417.519.718.120.419.116.417.913.917.418.515.718.220.422.718.822.719.213.98.112.217.215.013.310.812.815.7
Karnet14.515.614.215.718.519.014.613.514.014.815.816.917.421.220.820.117.713.914.412.110.4
Mandurah17.912.917.222.019.917.620.319.921.419.816.917.716.817.818.817.919.520.723.321.622.620.614.412.712.715.719.115.413.313.919.4
Millendon (Swan Valley)17.39.511.222.719.918.020.317.421.019.519.217.713.314.919.117.519.520.620.419.921.515.714.612.213.116.513.913.513.114.618.2
Pearce RAAF17.310.512.522.020.118.420.716.420.920.118.917.312.913.318.716.518.018.518.819.919.915.814.412.913.717.713.014.613.415.019.2
Perth Airport18.610.111.921.619.617.419.218.421.219.817.917.714.916.818.616.619.422.022.919.221.918.913.911.612.815.414.814.812.613.718.3
Perth Metro18.913.713.320.319.917.619.619.021.319.717.417.315.916.918.516.918.620.920.420.221.818.814.611.013.114.816.315.812.914.116.7
Rottnest Island18.116.418.021.219.818.519.519.520.619.819.018.817.818.619.619.019.621.520.720.421.321.315.114.714.216.820.216.613.915.318.4
Swanbourne18.813.115.722.319.918.019.319.820.919.918.016.716.018.119.017.419.021.820.220.420.620.014.211.813.315.918.215.413.214.219.3
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 2019
12345678910111213141516171819202122232425262728293031
Anketell - - - - - - 3.4 2.8 2.0 3.2 - - - - - - - - - - - - - - - - - - - - -
Bickley - - - - - - 1.8 0.4 1.4 4.2 - - - - - 0.2 - - - - - - - - - - - - - - -
Bungendore - - - - - - 1.6 1.4 1.8 3.6 - - - - - - - - - - - - - - - - - - - - -
Chidlow - - - - - - 0.4 - 0.7 2.0 - - - - - 0.1 1.0











Garden Island HSF - - - - - - 5.0 2.0 1.8 3.4 - - -





- - - - - - - - - - - -
Gidgegannup - - - - - - 0.4 0.4 0.8 2.6 - - - - - - - - - - - - - - - - - - - - -
Gosnells City - - - - - - 1.4 - - - - - - - - - - - - - - - - - - - - - - - -
Huntly 0.5 - - - - - 6.0 5.0 1.8 2.6 - - - - - - - - - - - - - - - - - - - - -
Jandakot Aero - - - - - - 1.4 1.0 1.6 3.4 - - - -
- - - - - - - - - - - - - - - -
Jarrahdale 0.2 0.2 - - - - 5.0 3.2 1.8 3.8 0.2 - - - - - 0.2 - - - - - - - - - - - - - -
Karnet 0.3


- - 6.6 2.6 1.5 2.8
- - - - - - - - - - - - - - - -

Karragullen North - - - - - - 1.8 1.8 1.2 3.0




















Maida Vale - - - - - - 2.8 - 1.6 2.2




















Mandurah - - - - - - 8.6 2.6 1.6 4.6 - - - - - - - - - - - - - - - - - - - - -
Midland - - - - 0.8 - 0.8 - - - - - - - - - - - - - - - - - - - - -


Millendon (Swan Valley) - - - - - - 0.4 0.2 0.4 2.6 0.2 - - - - - - - - - - - - - - - - - - - -
Mosman Park - - - - - - 2.0























Mount Solus 0.2 0.2 - - - - 7.2 3.8 1.8 5.0 - - - - - - - - - - - - - - - - - - - - -
Muchea - - - - - - 0.2 - 0.6 2.2 0.2 - - - - - - - - - - 0.2 - - - - - - - - -
Mundaring - - - - - - 0.8 0.5 4.2




















Pearce RAAF - - - - - - - 0.2 0.4 2.2 - - - - -
- - - - - - - - - - - - - - -
Perth Airport - - - - - - 1.2 0.2 1.0 2.0 - - - - - - - - - - - - - - - - - - - - -
Perth Metro - - - - - - 1.6 0.4 0.6 3.4 0.2 - - - - - - - - - - - - - - - - - - - -
Pinjarra South - - - - - - 8.2 1.8 1.6 4.2 - - - - - - - - - - - - - - - - - - - - -
Roleystone - - - - - - 3.2 - 2.8 2.4




















Rottnest Island - - - - - - 2.2 1.8 1.8 2.8 - - - - - - - - - 0.2 - - - - - - - - - - -
Serpentine - 0.2 - - - - 5.6 2.2 1.6 3.8 - - - - - - - - - - - - - - - - - - - - -
Subiaco Treatment Plant - - - - - - 1.4 4.6 0.5





















Swanbourne - - - - - - 1.0 0.6 1.2 5.2 - - - - - - - - - - - - - - - - - - - - -
Tamala Park (Mindarie) - - - - - - 1.4 - 1.0 - - - - - - - - - - - - - - - - -




Wanneroo - - - - - - 0.8 - 3.0



















Werribee - - - - - - 0.2 0.8 0.6 1.6 - - - - - - - - - - - - - - - - - - - - -
Whiteman Park - - - - - - - - 3.0 1.0




















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 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.

This summary includes 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 10 am on Monday 1 April 2019. 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