Perth in January 2017: A warm start, with a wet end

Across the Perth metropolitan area, mild monthly mean minimum temperatures were recorded. In contrast, monthly mean maximum temperature anomalies varied between below to above average across the region. Rainfall for the month was above average, with rainfall occurring generally towards the end of the month.

Above average rainfall

  • Good falls between the 29th to 31st resulted in above average to very much above average rainfall at most sites, with heavy rainfall recorded at a few sites on the 31st
  • Pearce RAAF and Perth Airport each recorded monthly rainfall totals at least three times the January average

Cool nights; a record cool day on the 30th

  • Mean minimum temperatures were below average, with both Perth Metro and Pearce RAAF recording overnight temperatures more than 1°C cooler than normal
  • Mean maximum temperatures varied across the region, ranging from 1.4 °C below average at Garden Island and Swanbourne to 0.4 °C above average at Pearce RAAF
  • The hottest days of the month were on the 4th and 26th, with the highest temperature of 44.5°C recorded at Pearce RAAF on the 4th
  • On the 30th, Perth Airport and Swanbourne recorded their coldest January day on record
  • Perth Metro recorded its equal fifth coolest January day in its 120 year recording history on the 30th (maximum of 20.3 °C). The Perth Metro record low January maximum is 19.7 °C on both 3 January 2007 and 19 January 1939.

Further information

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Extremes in January 2017
Hottest day 44.5 °C at Pearce RAAF on the 4th
Warmest days on average 33.9 °C at Pearce RAAF
Coolest days on average 25.9 °C at Rottnest Island
Coldest day 17.9 °C at Bickley on the 31st
Coldest night 8.0 °C at Jandakot Aero on the 13th
8.0 °C at Perth Airport on the 13th
Coolest nights on average 14.9 °C at Karnet
Warmest nights on average 18.5 °C at Rottnest Island
Warmest night 24.5 °C at Pearce RAAF on the 26th
Warmest on average overall 24.9 °C at Gosnells City
Coolest on average overall 22.2 °C at Rottnest Island
Wettest overall 65.6 mm at Tamala Park (Mindarie)
Wettest day 49.4 mm at Gidgegannup on the 31st
Strongest wind gust 78 km/h at Rottnest Island on the 16th

Record lowest January daily maximum temperature
New record
(°C)
Old
record
Years of
record
Average for
January
Perth Airport 19.7 on the 30th 20.1 on the 3rd in 2007 73 31.8
Swanbourne 19.5 on the 30th 20.4 on the 3rd in 2007 24 30.0



Summary statistics for January 2017
Maximum temperatures
(°C)
Minimum temperatures
(°C)
Rainfall
(millimetres)
Mean for
January
2017
Diff
from
average
Highest for
January
2017
Mean for
January
2017
Diff
from
average
Lowest for
January
2017
Total for
January
2017
Average
for
January
Rank of
January
2017
Fraction of
January
average
Bickley 30.8 +0.2 41.0 4th 15.1 -0.3 8.8 13th 10.8 17.7 average 61%
Garden Island HSF 26.2 -1.4 38.4 26th 18.4 -0.7 14.8 13th 14.0 10.8 average 130%
Gosnells City 32.7 -0.5 42.5 4th 17.7 -0.9 12.0 7th 24.3 11.7 high 208%
Jandakot Aero 30.9 -0.5 41.7 26th 16.0 -0.9 8.0 13th 18.6 14.3 high 130%
Karnet     40.2 4th 14.9 -0.5 9.0 23rd 17.8 17.1 high 104%
Pearce RAAF 33.9 +0.4 44.5 4th 15.4 -1.6 9.1 23rd 54.6 9.7 v high 563%
Perth Airport 32.0 +0.2 43.3 4th 16.3 -0.8 8.0 13th 36.0 10.0 v high 360%
Perth Metro 31.0 -0.2 42.0 26th 16.8 -1.4 11.5 13th 45.4 16.7 high 272%
Rottnest Island 25.9 -0.7 39.3 26th 18.5 -0.6 15.7 13th 11.2 12.0 average 93%
Swanbourne 28.6 -1.4 40.1 26th 17.7 -0.6 12.8 13th 33.8 15.5 high 218%
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 January 2017
12345678910111213141516171819202122232425262728293031
Bickley30.435.137.141.024.720.225.730.934.136.436.421.828.835.235.727.128.630.824.727.334.024.825.231.737.139.737.938.524.917.9
Garden Island HSF27.435.032.736.623.820.922.724.830.626.127.221.225.727.623.522.226.131.021.121.823.521.223.927.732.038.425.125.323.521.122.2
Gosnells City33.038.040.042.525.524.526.031.836.838.037.026.029.037.036.128.031.633.625.534.125.726.534.440.242.037.640.328.120.8
Jandakot Aero31.236.539.541.624.923.425.030.335.335.634.723.626.236.133.827.031.033.224.526.132.725.225.332.538.641.734.936.727.720.622.4
Karnet30.634.236.540.235.535.221.528.036.535.026.528.129.725.228.432.724.024.531.537.039.136.637.627.0
Pearce RAAF33.837.641.444.527.524.928.034.737.939.941.025.930.338.938.229.731.934.926.230.636.627.927.935.440.842.639.543.125.420.0
Perth Airport32.837.440.243.325.624.126.531.636.436.437.624.727.237.735.528.131.434.425.828.534.526.326.933.639.941.936.139.825.619.722.1
Perth Metro31.337.140.040.924.923.224.930.635.435.536.023.526.037.235.126.030.533.824.126.933.124.425.032.239.442.034.038.825.820.322.9
Rottnest Island25.834.432.836.223.622.322.023.525.925.629.622.624.126.824.023.625.330.622.423.224.022.722.825.430.939.324.425.622.919.521.7
Swanbourne29.136.538.440.124.023.023.926.733.929.332.123.125.532.126.924.329.132.523.024.327.423.623.330.637.140.127.933.323.919.522.1
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 January 2017
12345678910111213141516171819202122232425262728293031
Bickley12.515.017.221.117.612.310.214.214.218.417.913.98.813.419.315.012.712.713.712.015.313.410.912.116.620.921.716.020.014.0
Garden Island HSF16.619.320.319.119.217.616.717.617.821.221.517.514.817.721.218.716.717.918.515.317.818.616.115.918.620.221.420.020.618.616.8
Gosnells City18.022.022.521.217.612.013.318.121.422.617.113.015.817.916.117.617.116.615.515.715.812.615.520.021.020.623.017.616.9
Jandakot Aero15.915.518.718.720.116.510.013.615.919.421.116.68.013.113.716.015.516.916.311.812.815.89.412.815.221.419.619.722.318.516.5
Karnet12.715.018.922.016.412.613.614.017.817.514.311.514.315.814.012.813.113.211.513.413.89.012.616.018.016.620.017.514.1
Pearce RAAF15.516.918.415.618.114.29.312.416.217.419.016.99.212.212.516.216.116.713.09.815.09.111.415.524.517.519.721.116.116.2
Perth Airport16.116.218.719.820.616.59.515.517.919.721.816.88.013.213.616.215.916.716.813.412.415.89.612.116.721.720.719.822.216.515.8
Perth Metro16.318.218.218.920.016.913.813.717.017.321.217.111.514.315.317.716.116.717.312.414.916.812.713.515.821.321.420.121.416.716.1
Rottnest Island17.119.521.020.718.216.516.618.318.820.421.116.515.717.620.018.817.018.317.616.318.718.317.516.819.921.719.920.219.918.316.6
Swanbourne16.519.020.821.119.217.014.716.118.319.720.816.812.816.319.117.416.417.217.813.616.117.414.114.318.523.420.919.721.016.815.9
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 January 2017
12345678910111213141516171819202122232425262728293031
Anketell - - - - - - - - - - - 0.4 - - - - - - - - - - - - - - - - - 0.6 9.0
Bickley - - - - - - - - - - - 0.8 - - - - - - - - - - - - - - - - 0.2 9.8
Bungendore - - - - - 0.2 - - - - - 0.4 0.2 - - - - - - - - - - - - - - - 3.4 0.4 15.2
Chidlow - - - - - - - - - - - - - - - - - - - - - - - - - - - - 12.6 46.8
Garden Island HSF - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 10.0 4.0
Gidgegannup - - - - - - - - - - - 0.2 - - - - - - - - - - - - - - - - 0.2 15.4 49.4
Gosnells City - - - - - - - - - - - 0.2 - - - - - - - - - - - - - - - 4.2 19.8
Jandakot Aero - - - - - - - - - - - 0.6 - - - - - - - - - - - - - - - - - 0.8 17.2
Jarrahdale - - - - - 0.2 - 0.2 - - - 1.2 - - - - - - - - - 0.2 - - - - - - - 1.0 11.2
Karnet - - - - - - - - - - - 0.6
- - - - - - - - - - - - - - - 2.5 3.1 11.6
Karragullen North - - - - - - - - - - - 1.0 - - - - - - - - - - - - - - - - 1.2 3.2 27.8
Maida Vale - - - - - - - - - - - 0.6 - - - - - - - - - - - - - - - - 4.0 9.8 24.0
Midland - - - - - - - - - - - 0.1 - - - - - - - - - - - - - - - 18.4 36.2
Mount Helena










0.4















0.6 11.6 48.2
Mundaring - - - - - - - - - - - 0.8 - - - - - - - - - - - - - - - - - 12.4 44.4
Pearce RAAF - - - - - - - - - - - 0.4 - - - - -
- - - - - -
- - - 0.6 26.6 27.0
Perth Airport - - - - - - - - - - - - - - - - - - - - - - - - - - - - 0.2 6.2 29.6
Perth Metro - - - - - - - - - - - 0.4 - - - - - - - - - - - - - - - - 6.2 7.0 31.8
Pickering Brook










0.8















1.0 7.4 33.6
Roleystone - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 3.1 24.2
Rottnest Island - - - - - - - - - - - 0.6 - - - - - - - - - - - - - - - - - 1.2 9.4
Serpentine - - - - - - - - - - - 0.4 0.2 - - - - - - - - - - - - - - - 1.0 8.6 7.0
Swanbourne - - - - - - - - - - - 0.4 - - - - - - - - - - - - - - - - - 7.4 26.0
Tamala Park (Mindarie) - - - - - - - - - - - 0.1 - - - - - - - - - - - - - - - - 7.0 14.4 44.1
Wanneroo - - - - - - - - - - - 1.0


















Werribee - - - - - - - - - - - 0.2 - - - - - - - - - - - - - - - - 0.2 18.8 39.8
Whiteman Park - - - - - - - - - - - 1.0 - - - - - - - - - - - - - - - - 2.6 14.2 41.6
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 Wednesday 1 February 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