Perth in December 2016: A mild start and end

Mean maximum temperatures were mostly cooler than normal across the Perth metropolitan area, with days particularly mild at the start and end of December. Mean minimum temperatures were also below average, and nights were mostly cool to mild. Rainfall was near average for most sites.

Near average rainfall

  • Rainfall totals at most sites were generally less than 15 mm over 3 or 4 rain days
  • A mid-level trough produced thunderstorms with moderate falls on the 12th and 13th and totals were higher in the Perth hills; 29.8 mm on the 13th at Karragullen North was the highest daily total of the month

Below average maximum and minimum temperatures

  • Mean maximum temperatures were mostly between 0.5 °C and 1.5 °C below average but Perth Airport and Pearce RAAF were slightly above average
  • The hottest day of the month was the 21st and Perth Metro recorded a daily maximum temperature 42.4 °C, its second-highest temperature in December in 121 years of record and highest for 10 years, since the record of 44.2 °C on 26 December 2007
  • Perth Metro's mean maximum of 28.4 °C was its lowest in December for eight years
  • Minimum temperatures were mostly between 0.5 °C and 1.0 °C below average
  • Perth Metro's mean minimum of 15.7 °C was its lowest in December for eight years

Further information

Media
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Extremes in December 2016
Hottest day 43.3 °C at Jandakot Aero on the 21st
Warmest days on average 30.8 °C at Pearce RAAF
Coolest days on average 24.5 °C at Rottnest Island
26.4 °C at Swanbourne
Coldest day 19.7 °C at Karnet on the 12th
Coldest night 8.5 °C at Pearce RAAF on the 28th
Coolest nights on average 12.7 °C at Bickley
Warmest nights on average 16.9 °C at Rottnest Island
15.8 °C at Swanbourne
Warmest night 22.4 °C at Gosnells City on the 10th
Warmest on average overall 22.2 °C at Pearce RAAF
22.1 °C at Perth Metro
Coolest on average overall 20.0 °C at Bickley
20.0 °C at Karnet
Wettest overall 38.6 mm at Karragullen North
Driest overall 2.4 mm at Rottnest Island
6.0 mm at Swanbourne
Wettest day 29.8 mm at Karragullen North on the 13th
Strongest wind gust 81 km/h at Rottnest Island on the 24th

Summary statistics for December 2016
Maximum temperatures
(°C)
Minimum temperatures
(°C)
Rainfall
(millimetres)
Mean for
December
2016
Diff
from
average
Highest for
December
2016
Mean for
December
2016
Diff
from
average
Lowest for
December
2016
Total for
December
2016
Average
for
December
Rank of
December
2016
Fraction of
December
average
Bickley 27.4 -0.7 39.7 21st 12.7 -1.0 9.1 28th 19.0 13.9 average 137%
Garden Island HSF 24.6 -0.9 40.9 21st 16.6 -0.6 13.5 8th 6.2 10.7 average 58%
Gosnells City 29.1 -1.3 42.4 21st 15.6 -0.7 10.6 28th 10.7 11.4 average 94%
Jandakot Aero 28.5 -0.6 43.3 21st 14.2 -0.5 8.6 29th 6.6 10.6 average 62%
Karnet 27.1 -1.1 38.6 21st 12.9 -0.6 9.6 29th 37.2 18.6 high 200%
Pearce RAAF 30.8 +0.5 42.9 21st 13.5 -1.0 8.5 28th 13.8 10.8 high 128%
Perth Airport 29.3 +0.3 42.8 21st 14.7 -0.2 8.9 28th 7.4 11.2 average 66%
Perth Metro 28.4 -0.7 42.4 21st 15.7 -0.7 11.8 29th 10.2 9.7 average 105%
Rottnest Island 24.5 -0.5 39.8 21st 16.9 -0.7 14.2 8th 2.4 10.3 average 23%
Swanbourne 26.4 -1.6 42.0 21st 15.8 -0.7 11.6 29th 6.0 11.8 average 51%
Note: Observations for “Perth Metro” are taken from the current site at Mount Lawley (Bureau number 009225).
Comparisons are made against combined data from the current site (which opened in early 1993) and the previous site at Perth Regional Office (009034), which ran from 1876 to early 1992.

Daily maximum temperatures for December 2016
12345678910111213141516171819202122232425262728293031
Bickley23.726.821.622.623.023.924.328.433.636.629.120.624.828.330.228.128.525.128.331.439.728.032.631.831.030.420.421.625.322.727.1
Garden Island HSF20.822.122.620.020.321.120.926.632.034.922.223.322.427.630.826.825.921.623.831.140.922.524.123.224.124.920.620.220.820.823.0
Gosnells City25.128.823.424.124.625.525.631.636.437.832.025.428.031.633.631.031.025.228.834.842.429.134.633.1  23.824.026.026.030.0
Jandakot Aero23.727.423.223.023.824.624.530.035.337.929.024.825.229.533.630.829.325.327.334.343.327.133.230.333.031.423.023.224.324.127.9
Karnet22.726.420.422.022.123.025.128.733.536.529.019.724.928.929.226.829.424.527.531.538.627.935.031.129.320.022.026.224.026.7
Medina Research Centre23.327.222.822.222.623.423.330.035.539.026.9
Pearce RAAF26.330.725.425.826.128.026.031.737.640.732.226.027.931.535.332.031.927.930.635.442.929.436.134.434.935.724.524.428.325.930.1
Perth Airport25.229.123.524.524.825.524.630.936.039.130.724.726.431.233.830.930.725.928.034.442.827.734.131.434.033.823.223.524.824.228.9
Perth Metro24.327.923.423.623.824.724.130.035.837.628.624.624.830.133.730.830.024.227.334.342.427.132.629.932.732.722.522.924.223.227.4
Rottnest Island21.921.822.221.221.722.122.224.930.833.722.923.021.225.630.023.324.722.122.228.439.823.625.523.924.126.021.721.821.221.722.9
Swanbourne23.523.622.921.822.223.523.128.433.836.225.123.722.627.831.827.528.623.124.033.342.026.529.825.528.827.122.421.921.822.524.1
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 2016
12345678910111213141516171819202122232425262728293031
Bickley11.310.311.810.49.911.313.09.812.817.915.315.911.012.914.713.910.513.011.312.115.817.215.517.014.512.112.49.19.211.69.5
Garden Island HSF16.713.916.615.015.015.117.913.515.519.518.717.915.116.318.916.914.118.015.616.319.819.219.120.118.117.116.615.114.115.214.1
Gosnells City12.913.813.411.313.015.513.117.222.418.417.413.915.819.217.214.014.113.516.220.020.018.416.716.018.110.611.113.016.0
Jandakot Aero10.711.611.613.111.59.517.212.812.718.217.917.212.814.616.916.313.713.812.515.619.719.914.616.916.116.016.210.48.611.010.1
Karnet12.111.110.011.010.09.913.59.913.219.015.014.811.314.015.413.811.013.011.012.617.017.114.916.015.013.013.210.59.612.410.5
Medina Research Centre12.513.412.814.012.710.117.712.713.218.016.517.1
Pearce RAAF11.411.312.212.89.99.313.612.411.710.915.017.314.914.916.816.014.011.512.213.422.119.813.514.916.516.815.68.59.38.811.0
Perth Airport11.013.313.713.711.610.717.313.413.515.316.217.814.915.117.217.314.114.713.715.820.120.215.716.617.816.216.38.99.510.612.1
Perth Metro13.714.015.714.612.812.917.813.314.116.218.217.714.415.618.317.914.215.514.516.020.320.017.319.217.916.216.313.411.813.113.1
Rottnest Island16.914.615.915.515.415.717.314.217.719.918.417.715.216.619.317.114.717.316.017.320.418.619.120.018.117.616.216.014.316.315.1
Swanbourne13.913.116.114.513.213.717.713.715.818.518.017.413.915.718.417.114.315.414.316.921.119.517.618.916.716.817.114.111.613.512.7
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 2016
12345678910111213141516171819202122232425262728293031
Anketell - - - 1.2 - - 0.2 - - - - 13.2 - - - - - - - - - - - - - - 0.8 0.2 - - -
Bickley - - - 0.2 0.2 - - - - - - 12.4 5.6 - - - - - - - - - - - - - 0.6 - - - -
Bungendore - - - 2.0 - - 0.4 - - - - 6.2 0.4 - - - - - - - - 1.6 - - - - 1.6 - - - -
Chidlow - - - - - - - - - - 7.8 2.4

















Garden Island HSF - - - 1.8 - - - - - - - 4.0 0.2 - - - - - - - - - - - - - 0.2 - - - -
Gidgegannup - - - 1.6 - - - - - - - 8.0 10.2 - - - - - - - - - - - - - 0.6 0.8 - - -
Gosnells City - - - 0.3 - - 0.4 - - - - 8.6 - - - - - - - - - - - - - - 1.4 - - - -
Jandakot Aero - - - 0.4 - - 0.2 - - - - 5.0 - - - - - - - - - - - - - - 0.8 0.2 - - -
Jarrahdale - - - 0.8 - - 0.4 0.2 - - - 28.6 2.6 - - - - - - - - - - - - - 3.6 - - - -
Karnet - - - 1.8 - - 0.4 - - - - 15.8 18.0 - - - - - - - - - - - - - 1.2 - - - -
Karragullen North - - - 2.0 - - - - - - - 6.8 29.8

















Maida Vale - - - 0.8 - - - - - - - 10.2 1.0 - - - - - - - - - - - - - 1.2 0.2


Medina Research Centre - - - 1.8 - - 0.4 - - - - 7.0


















Midland - - - - - - - - - 16.2 - - - - - - - - - - - - - - - 0.4 - -
Mount Helena


1.4






9.4 3.4












0.6 0.2


Mundaring - - - 0.6 - - - - - - - 15.2 4.8 - - - - - - - - - - - - - 0.6 0.4


Pearce RAAF - - - 0.4 - - - - - - - 11.8 1.6 - - - - - - - - - - - - - - - - - -
Perth Airport - - - 0.2 - - - - - - - 6.4 0.2 - - - - - - - - - - - - - - 0.6 - - -
Perth Metro - - - 1.8 - - - - - - - 7.8 - - - - - - - - - - - - - - 0.6 - - - -
Pickering Brook










14.4 7.0












1.2



Roleystone - - - - - - 2.0 - - - - 12.1 9.3 - - - - - - - - - - - - - 1.1



Rottnest Island - - - 0.4 - - - - - - - 1.8 - - - - - - - - - - - - - - 0.2 - - - -
Serpentine - - - - - - 0.2 - - - - 16.8 0.6 0.2 - - - - - - - - - - - - 1.8 0.2 - - -
Swanbourne - - - 0.2 - - - - - - - 5.6 - - - - - - - - - - - - - - 0.2 - - - -
Wanneroo - - 0.4 - - - - 5.0 3.0

















Werribee - - - 0.4 0.2 - - - - - - 9.0 7.0 - - - - - - - - - - - - - 0.2 0.2 - - -
Whiteman Park - - - - - - - - - - - 8.2 - - - - - - - - - - - - - - - 1.8


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 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 statement has been prepared based on information available at 1 pm on Tuesday 3 January 2017. Some checks have been made on the data, but it is possible that results will change as new information becomes available.

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.

Observations for “Perth Metro” are taken from the current site at Mount Lawley (Bureau number 009225).
Comparisons are made against combined data from the current site (which opened in early 1993) and the previous site at Perth Regional Office (009034), which ran from 1876 to early 1992.

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