Mount Isa Long-term Averages

  Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Ann
Mean Max (°C)
36.5 35.5 34.5 32.1 28.0 25.0 25.0 27.5 31.5 34.9 36.7 37.3 32.0
Mean Min (°C)
23.8 23.3 21.8 18.5 13.9 10.0 8.7 10.2 14.3 18.5 21.5 23.1 17.3
Mean Rain (mm)
113.5 101.2 64.1 13.1 11.6 7.0 5.6 3.4 8.5 18.4 37.2 69.4 461.0
Median Rain (mm)
72.8 85.6 38.0 1.8 3.7 0.0 0.0 0.4 0.4 8.6 25.2 49.4 421.2
Mean Rain Days
9.7 8.8 5.7 2.0 1.6 1.1 0.9 0.9 1.7 3.3 5.3 7.6 49.0

Mount Isa Daily Records

  Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Ann
High Max (°C)
45.9 43.5 41.9 38.6 37.8 34.3 35.2 36.4 40.4 42.5 43.9 45.3 45.9
Low Max (°C)
22.8 23.1 23.3 17.0 15.6 9.4 10.1 14.1 14.8 19.1 19.1 20.4 9.4
High Min (°C)
31.6 30.1 29.3 27.3 24.0 20.3 20.1 21.3 26.6 28.2 30.1 30.7 31.6
Low Min (°C)
15.4 13.1 13.1 5.8 1.8 -1.3 -2.9 -1.1 1.0 6.1 10.3 12.0 -2.9
High Rain (mm)
213.0 148.8 153.8 44.6 106.4 54.8 61.8 26.6 70.3 39.2 102.4 115.0 213.0

Mount Isa Monthly Records

  Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Ann
High Mn. Max (°C)
40.3 40.5 38.3 35.1 31.1 28.8 27.9 31.6 35.3 38.2 40.1 41.2 34.2
Low Mn. Max (°C)
30.0 31.3 30.2 26.9 24.2 20.4 22.6 24.9 27.6 31.9 32.7 31.6 29.9
High Mn. Min (°C)
26.2 25.5 24.4 20.9 17.7 13.9 12.9 13.8 17.8 21.7 24.1 25.8 19.3
Low Mn. Min (°C)
21.1 19.9 18.4 15.3 9.3 6.5 5.0 5.9 10.8 14.6 19.7 20.1 15.4
High Rain (mm)
535.2 278.2 276.6 167.8 176.4 111.8 67.4 41.8 117.0 91.4 205.6 275.2 1092.4
Low Rain (mm)
0.2 2.2 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 93.4

Mount Isa Annual Temperatures & Rainfall

Mount Isa annual climate

Mount Isa Average Number of Days With Temperatures

  Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Ann
≥ 40°C
5.4 2.8 0.4 0.0 0.0 0.0 0.0 0.0 0.0 1.1 4.5 7.4 21.5
≥ 35°C
22.0 16.6 14.8 4.5 0.2 0.0 0.0 0.4 5.5 16.7 22.4 24.1 126.1
≥ 30°C
28.8 26.0 28.8 23.9 9.2 1.7 1.9 8.0 20.9 27.9 28.5 29.6 232.9
≤ 2°C
0.0 0.0 0.0 0.0 0.0 0.6 1.5 0.7 0.1 0.0 0.0 0.0 2.9
≤ 0°C
0.0 0.0 0.0 0.0 0.0 0.1 0.4 0.1 0.0 0.0 0.0 0.0 0.6

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

  Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Ann
High Max
40.0 39.0 37.0 34.7 31.2 28.5 28.4 31.2 35.3 38.0 39.8 40.5 37.9
Low Max
32.0 31.4 31.7 28.9 24.3 21.1 21.0 23.2 26.8 30.9 33.1 33.5 25.1
High Min
26.3 25.7 24.4 22.0 18.5 14.3 13.1 15.0 18.8 22.6 24.9 26.1 24.0
Low Min
21.3 21.2 18.6 15.0 9.4 5.6 4.0 5.6 9.8 14.3 17.9 20.2 9.3

Mount Isa Data Availability

  Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Ann
Years of Minima
53 54 54 54 54 54 55 54 52 54 54 53 54.0
Earliest Entry
1967 1967 1967 1967 1967 1967 1967 1967 1967 1967 1967 1966 1966
Latest Entry
2021 2021 2021 2021 2021 2021 2021 2021 2021 2021 2021 2020 2021
Years of Maxima
54 54 54 54 54 54 55 54 53 54 54 53 54.0
Earliest Entry
1967 1967 1967 1967 1967 1967 1967 1967 1967 1967 1967 1966 1966
Latest Entry
2021 2021 2021 2021 2021 2021 2021 2021 2021 2021 2021 2020 2021
Years of Rainfall
55 54 54 55 55 55 55 55 55 55 54 53 54.0
Earliest Entry
1967 1967 1967 1967 1967 1967 1967 1967 1967 1967 1967 1966 1966
Latest Entry
2021 2021 2021 2021 2021 2021 2021 2021 2021 2021 2021 2020 2021

Station Details

MOUNT ISA AERO
Northwest, Queensland
20.6778°S 139.4875°E 341m AMSL
Commenced 1966

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