Greater Perth in November 2018: dry with mild days and cool nights

Rainfall in November 2018 was very much below average across Perth, and it was the driest November on record at Perth Metro and driest for 61 years for the city. Daytime temperatures were generally mild while overnight temperatures were mostly cool.

Well below average rainfall across Perth

  • It was a very dry month across Perth, with most sites recording less than 10 mm monthly rainfall totals
  • Perth Metro recorded 3.2 mm in total, which was the driest November in its 25 years of record; the previous record was 4.4 mm on November 1999
  • It was the driest November for 61 years for the Perth city (Perth Regional Office and Perth Metro records combined) when 1.6 mm was recorded in November 1957
  • Rottnest Island also recorded 3.2 mm in November, which was its driest November for 24 years
  • Most sites recorded light falls on the 5th, 6th, 23rd and 26th from weak cold fronts and troughs

Mild daytime temperatures and cool overnight temperatures

  • Both mean maximum and minimum temperatures were below average across Perth
  • Perth Metro recorded mean maximum and minimum temperatures of 25.2 °C and 13.5 °C respectively, which was its coolest November in 10 years, since 23.6 °C and 12.4 °C in November 2008
  • Rottnest Island equalled its coolest November on record with 2005, and Swanbourne had its record lo, in terms of mean maximum temperature

Perth Metro

  • Total rainfall for Perth Metro was 3.2 mm, which is 15% of the long-term average of 21.8 mm
  • The mean daily maximum temperature for Perth Metro was 25.2 °C, which is 1.6 °C below the long-term average of 26.8 °C
  • The warmest day was 35.9 °C on the 16th, and the coolest day was on the 6th when the temperature reached 19.6 °C
  • The mean daily minimum temperature for Perth Metro was 13.5 °C, which is 0.9 °C below the long-term average of 14.4 °C
  • The coldest morning was 8.0 °C on the 7th, and the warmest morning was on the 17th when the minimum temperature was 18.3 °C

Further information

Media
(03) 9669 4057
Enquiries

Extremes in November 2018
Hottest day 37.1 °C at Pearce RAAF on the 16th
Warmest days on average 27.3 °C at Pearce RAAF
Coolest days on average 21.1 °C at Rottnest Island
22.7 °C at Swanbourne
Coldest day 15.8 °C at Bickley on the 5th
Coldest night 4.5 °C at Millendon (Swan Valley) on the 8th
Coolest nights on average 10.5 °C at Bickley
Warmest nights on average 14.8 °C at Rottnest Island
14.1 °C at Mandurah
Warmest night 20.6 °C at Mandurah on the 17th
Warmest on average overall 19.7 °C at Pearce RAAF
Coolest on average overall 17.0 °C at Bickley
Wettest overall 16.7 mm at Huntly
Driest overall 1.2 mm at Werribee
Wettest day 6.8 mm at Huntly on the 23rd
Strongest wind gust 76 km/h at Rottnest Island on the 29th

Record lowest November total rainfall
New record
(mm)
Old
record
Years of
record
Average for
November
Perth Metro 3.2 4.4 in 1999 26 21.8

Lowest November total rainfall for at least 20 years
Observed
(mm)
Most recent
lower
Average for
November
Rottnest Island 3.2 2.2 in 1994 18.8

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




Record lowest November mean daily maximum temperature
New record
(°C)
Old
record
Years of
record
Average for
November
Rottnest Island 21.1 = 21.1 in 2005 28 23.2
Swanbourne 22.7 22.8 in 2008 25 25.5



Summary statistics for November 2018
Maximum temperatures
(°C)
Minimum temperatures
(°C)
Rainfall
(millimetres)
Mean for
November
2018
Diff
from
average
Highest for
November
2018
Mean for
November
2018
Diff
from
average
Lowest for
November
2018
Total for
November
2018
Average
for
November
Rank of
November
2018
Fraction of
November
average
Bickley 23.5 -1.6 32.4 16th 10.5 -1.4 5.4 7th 8.8 40.9 low 22%
Garden Island HSF 21.3 -2.6 28.2 22nd 14.6 -1.2 9.9 7th 3.2 20.8 low 15%
Jandakot Aero 24.8 -1.6 35.0 16th 12.1 -0.6 6.3 7th 11.0 27.3 low 40%
Mandurah 23.1 -1.8 33.6 16th 14.1 -1.6 9.0 7th 8.0 22.7 low 35%
Millendon (Swan Valley) 26.9   36.2 16th 12.0   4.5 8th  
Pearce RAAF 27.3 -0.1 37.1 16th 12.0 -0.6 5.2 8th 3.8 22.5 low 17%
Perth Airport 25.7 -0.3 36.0 16th 12.5 -0.3 6.1 8th 4.8 25.6 v low 19%
Perth Metro 25.2 -1.6 35.9 16th 13.5 -0.9 8.0 7th 3.2 21.8 lowest 15%
Rottnest Island 21.1 -2.1 25.2 16th 14.8 -1.2 10.3 7th 3.2 18.8 v low 17%
Swanbourne 22.7 -2.8 31.9 9th 13.6 -1.2 8.5 7th 5.0 22.6 low 22%

Daily maximum temperatures for November 2018
123456789101112131415161718192021222324252627282930
Bickley18.821.425.220.115.816.822.326.931.126.322.421.425.128.932.232.424.221.218.720.624.825.622.121.818.920.924.126.126.022.4
Garden Island HSF20.319.420.921.217.716.918.621.426.821.219.221.121.621.923.927.123.223.018.919.021.428.220.121.722.320.423.020.120.318.9
Gosnells City26.523.126.819.019.523.534.228.024.023.726.434.235.625.521.028.823.622.123.728.1
Jandakot Aero21.621.826.221.619.718.922.028.334.025.822.824.125.129.932.835.024.123.621.321.024.829.223.223.021.522.725.725.526.222.7
Karnet18.425.216.016.821.530.027.022.220.724.731.325.021.319.224.522.521.019.020.325.222.8
Mandurah20.520.623.621.019.218.418.924.131.524.722.321.322.826.829.133.623.022.120.619.823.127.922.722.220.521.423.222.923.521.1
Millendon (Swan Valley)22.520.025.630.235.428.724.424.627.632.434.736.225.824.322.222.727.329.825.324.622.823.827.328.027.824.3
Pearce RAAF22.525.827.923.620.820.725.630.436.229.224.926.328.432.935.637.126.625.523.023.428.532.626.225.324.824.428.528.828.325.1
Perth Airport21.523.226.521.919.519.723.929.234.827.023.824.325.831.334.536.025.424.021.822.226.929.924.923.422.623.627.126.727.423.4
Perth Metro21.822.626.122.019.719.623.627.333.825.823.424.226.031.532.335.924.524.121.221.126.329.624.223.422.923.226.825.825.022.5
Rottnest Island21.019.620.721.318.217.619.220.622.921.420.121.520.622.423.725.222.122.720.318.420.722.521.421.322.020.423.221.121.319.6
Swanbourne20.920.321.921.819.218.220.724.231.922.120.721.821.725.825.831.122.223.820.719.123.827.821.922.421.721.124.422.322.620.3
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 November 2018
123456789101112131415161718192021222324252627282930
Bickley10.48.912.19.89.37.15.47.210.513.113.99.412.511.715.413.816.713.99.25.88.312.312.010.88.56.38.010.011.59.9
Garden Island HSF15.414.215.514.314.711.29.912.314.516.617.014.415.915.018.218.319.017.413.910.811.917.316.314.313.811.312.614.315.512.6
Gosnells City11.514.111.710.510.19.518.015.011.015.214.716.118.517.47.312.110.19.414.0
Jandakot Aero13.59.413.610.712.810.06.37.813.914.614.511.214.713.215.017.618.315.813.37.39.114.513.112.06.57.711.511.512.211.9
Karnet10.77.39.07.55.28.112.813.19.413.611.514.014.210.46.413.69.57.19.010.0
Mandurah14.913.714.513.913.910.99.011.413.816.216.914.315.814.717.817.520.617.413.810.011.816.815.113.311.911.112.013.814.612.3
Millendon (Swan Valley)13.89.67.44.514.415.214.09.516.012.713.717.817.915.513.58.410.114.413.610.37.27.412.17.910.713.3
Pearce RAAF13.59.411.213.512.29.47.65.213.916.914.99.815.913.412.818.417.816.213.67.89.815.914.69.36.37.810.68.610.713.3
Perth Airport13.79.413.912.313.39.39.06.114.413.513.710.516.114.014.117.517.816.913.58.911.916.413.412.27.58.612.19.511.913.1
Perth Metro14.111.814.613.314.211.08.09.914.916.714.912.816.013.715.117.918.317.014.09.511.517.013.913.59.69.912.113.113.313.2
Rottnest Island15.014.915.814.713.711.210.313.114.917.016.415.016.016.117.818.318.416.513.511.612.316.516.615.014.412.113.415.215.313.5
Swanbourne13.912.615.113.414.210.08.510.014.615.015.213.715.714.717.118.318.716.613.89.411.316.614.812.911.79.812.612.113.112.8
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 November 2018
123456789101112131415161718192021222324252627282930
Anketell - - - - 1.8 2.4 - - - - - - - - - - - - - - - - 1.8 - - - - - - -
Bickley - - - - 4.4 0.2 - - - - - - - - - - - - 0.8 - - - 1.2 - - 2.2 - - - -
Bungendore - - - - 2.8 0.2 - - - - - - - - - - - - - - - - 3.0 - - 1.0 - - - -
Chidlow - - - 1.1
























Garden Island HSF - - - - 0.8 0.4 - - - - - - - - - - - - - - - - 0.2 0.2 - 1.6 - - - -
Gidgegannup - - - - 3.2 - - - - 0.2 - - - - - - - - - - - - - - - 0.8 - - - -
Gosnells City - - - - - - - - - - 2.0 - - - - - - - - - - - - - - - - - - -
Huntly - - - - 5.4 0.5 - - - - - - - - - - - - - - - - 6.8 - - 4.0 - - - -
Jandakot Aero - - - - 4.4 - - - - - - - - - - - - - - - - - 6.6 - - - - - - -
Jarrahdale - - - - 6.0 0.4 0.2 - 0.2 - - - - - 0.2 - - - 1.0 0.2 - - 2.2 - - 6.2 - - - -
Karnet - - 4.4 0.8 - - - - - - - - - -
- 0.8 - - - - - - 3.4 -

-
Karragullen North - - - - 4.2 - - - - - - - - - - - - - - - - - 2.2 - - 2.8



Maida Vale - - - - 2.2 - - - - - - - - - - - - - - - - - 1.6 - - 1.4



Mandurah - - - - 1.4 0.6 - - - - - - - - - - - - - - - - 2.0 - - 4.0 - - - -
Midland - - - - - 1.0





















Millendon (Swan Valley) -





- - - 1.0 - - - - - - - - - - - - - - - - - - -
Mount Solus - - 0.8 - 3.8 - - - - - - - - - - - - - 0.4 - - - 3.2 - - 2.2 0.2 - - -
Muchea - - - - 0.6 - - - - 2.4 0.2 - - - - - - - - - - - - - - - - - - -
Mundaring - - - - 2.4 0.2 - - - - 2.8 - - - - - - - - - - - 0.8 - - 4.0



Noble Falls




1.4


2.0











0.2

0.4



Pearce RAAF - - - - 0.6 - - - - 2.8 - - - - - - - - - - -
0.4 - - - - - - -
Perth Airport - - - - 2.2 - - - - - - - - - - - - - - - - - 1.0 - - 1.6 - - - -
Perth Metro - - - - 1.8 - - - - - - - - - - - - - - - - - 1.4 - - - - - - -
Pinjarra Refinery - - - - 3.0 0.8 - - - - - - - - - - - - - - - - 3.2 - - 5.2 - - - -
Pinjarra South - - - - 1.6 1.2 - - - - - - - - - - - - - - - - 1.0 - - 2.4 - - - -
Roleystone - - - - 4.0 0.4 - - - - - - - - - - - - - - - - 4.6 - - 1.4



Rottnest Island - - - - 1.4 0.8 - - - - - - - - - - - - - - - - - - - 1.0 - - - -
Serpentine - - - - 4.0 0.4 - - - - - - - - - - - - - - - - 2.4 - - 1.8 - - - -
Swanbourne - - - - 1.8 0.6 - - - - - - - - - - - - 0.4 - - - 2.2 - - - - - - -
Tamala Park (Mindarie) - - - - - 1.8 - - - 2.0 - - - - - - - - - - - - - 0.8 - - - - - -
Wanneroo - - - - - - - - - - - - - - - - - - - - - - - 1.4



Werribee - - - - 0.4 - - - - 0.6 - - - - - - - - - - - - 0.2 - - - - - - -
Whiteman Park - - - - 3.2 - - - - - - - - - - - - - - - - - 0.8






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 9 am on Monday 3 December 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