Mount William Long-term Averages

  Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Ann
Mean Max (°C)
21.4 20.2 17.6 12.5 8.4 5.9 5.0 5.8 8.9 12.9 16.2 18.3 12.8
Mean Min (°C)
10.2 9.6 8.5 6.0 3.6 1.8 0.9 1.0 2.2 4.0 6.5 7.9 5.2
Mean Rain (mm)
65.0 37.3 52.7 79.3 134.0 128.1 170.1 154.1 117.1 79.8 72.7 61.3 1139.8
Median Rain (mm)
46.8 35.4 30.4 79.0 119.2 107.8 156.0 123.4 86.8 56.4 73.2 99.4 1109.8
Mean Rain Days
9.1 11.7 14.2 17.7 22.4 24.1 25.5 23.5 21.0 16.4 14.8 11.7 210.1

Mount William Daily Records

  Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Ann
High Max (°C)
36.6 36.6 32.2 26.1 18.0 13.4 12.1 16.1 20.6 27.0 32.1 36.1 36.6
Low Max (°C)
7.8 7.0 5.4 2.4 0.1 -0.2 -0.4 -0.9 -0.5 2.2 0.0 3.8 -0.9
High Min (°C)
25.9 25.6 23.2 19.6 11.4 7.6 6.4 8.2 12.2 19.3 20.4 22.5 25.9
Low Min (°C)
0.9 1.8 -0.1 -1.2 -2.1 -2.6 -4.1 -3.8 -3.8 -3.3 -2.5 -0.5 -4.1
High Rain (mm)
134.6 40.8 35.4 62.8 60.6 41.8 70.0 49.0 78.6 51.4 58.4 70.0 134.6

Mount William Monthly Records

  Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Ann
High Mn. Max (°C)
24.8 22.3 20.4 16.5 10.1 7.0 6.4 8.1 10.9 18.5 19.8 22.5 14.1
Low Mn. Max (°C)
19.0 16.9 14.5 9.5 6.8 4.0 3.7 3.6 6.8 10.1 13.0 14.7 11.8
High Mn. Min (°C)
12.6 12.1 11.2 8.0 5.6 3.2 2.0 2.9 4.4 7.6 10.8 10.7 5.9
Low Mn. Min (°C)
8.7 7.5 5.4 3.4 2.2 0.4 -0.2 0.1 0.9 2.2 4.1 5.6 4.6
High Rain (mm)
289.6 93.6 90.2 151.0 240.2 247.0 244.6 312.0 328.2 225.0 115.4 143.6 1427.0
Low Rain (mm)
2.6 2.8 16.0 22.8 88.0 47.4 64.6 0.0 49.6 11.4 29.2 0.0 794.4

Mount William Annual Temperatures & Rainfall

Mount William annual climate

Mount William Average Number of Days With Temperatures

  Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Ann
≥ 40°C
0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0
≥ 35°C
0.5 0.1 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.1 0.7
≥ 30°C
3.5 1.3 0.5 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.1 1.4 6.9
≤ 2°C
0.3 0.1 0.9 3.9 9.4 16.0 23.1 22.7 17.1 13.8 6.7 2.9 116.0
≤ 0°C
0.0 0.0 0.1 0.7 2.1 5.9 8.9 11.8 8.3 5.3 1.5 0.3 44.5

Mount William 'per Week' Values (14th/86th Percentiles)

  Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Ann
High Max
27.8 27.4 24.6 17.2 11.6 8.1 6.9 9.9 13.4 19.0 24.1 24.0 21.5
Low Max
14.3 13.3 10.9 6.9 5.0 2.9 2.4 3.1 4.4 6.0 9.3 11.1 4.7
High Min
16.8 16.0 14.0 9.7 6.5 3.8 2.5 3.8 5.0 8.4 13.7 13.4 11.4
Low Min
4.4 3.7 3.7 1.8 0.9 -0.5 -0.8 -0.9 -0.7 -0.4 1.7 2.3 0.2

Mount William Data Availability

  Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Ann
Years of Minima
15 15 15 15 15 14 15 15 15 15 15 15 15.0
Earliest Entry
2006 2006 2006 2006 2006 2006 2006 2006 2006 2006 2006 2005 2005
Latest Entry
2021 2020 2020 2020 2020 2020 2020 2020 2020 2020 2020 2020 2021
Years of Maxima
15 15 15 15 15 14 15 15 15 15 15 15 15.0
Earliest Entry
2006 2006 2006 2006 2006 2006 2006 2006 2006 2006 2006 2005 2005
Latest Entry
2021 2020 2020 2020 2020 2020 2020 2020 2020 2020 2020 2020 2021
Years of Rainfall
15 15 15 15 15 14 15 15 15 15 14 15 15.0
Earliest Entry
2006 2006 2006 2006 2006 2006 2006 2006 2006 2006 2006 2005 2005
Latest Entry
2021 2020 2020 2020 2020 2020 2020 2020 2020 2020 2020 2020 2021

Station Details

GRAMPIANS (MOUNT WILLIAM)
South West, Victoria
37.2950°S 142.6039°E 1150m AMSL
Commenced 2005

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Hottest start to year in decades for west coast

14:51 AEDT Perth days for the first half of January are averaging the hottest since 1962.  Only two days this month so far have stayed below 30 degrees - and then barely - pushing the average maximum for the month so far up to 33.6 degrees, 2.5 degrees above average.

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