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 25.1 24.9 27.5 31.6 34.9 36.7 37.4 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)
115.9 101.3 66.5 13.3 11.4 6.7 7.5 3.3 8.7 19.1 38.8 67.2 463.7
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
10.0 8.9 5.8 2.0 1.6 1.1 1.0 0.9 1.7 3.3 5.5 7.5 49.2

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 45.4 45.9
Low Max (°C)
22.8 23.1 21.1 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 78.4 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 84.2 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
5.5 2.6 0.5 0.0 0.0 0.0 0.0 0.0 0.0 1.1 4.4 7.8 21.9
≥ 35°C
21.8 16.4 14.9 4.8 0.2 0.0 0.0 0.4 5.6 16.9 22.3 24.3 127.0
≥ 30°C
28.8 26.0 28.7 24.0 9.1 1.9 1.9 8.0 21.0 28.0 28.5 29.7 233.9
≤ 2°C
0.0 0.0 0.0 0.0 0.0 0.6 1.4 0.7 0.1 0.0 0.0 0.0 2.8
≤ 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
56 57 56 56 56 56 57 56 54 56 57 56 57.0
Earliest Entry
1967 1967 1967 1967 1967 1967 1967 1967 1967 1967 1967 1966 1966
Latest Entry
2024 2024 2024 2023 2023 2023 2023 2023 2023 2023 2023 2023 2024
Years of Maxima
57 57 56 56 56 56 57 56 55 56 57 56 57.0
Earliest Entry
1967 1967 1967 1967 1967 1967 1967 1967 1967 1967 1967 1966 1966
Latest Entry
2024 2024 2024 2023 2023 2023 2023 2023 2023 2023 2023 2023 2024
Years of Rainfall
58 57 56 57 57 57 57 57 57 57 57 56 57.0
Earliest Entry
1967 1967 1967 1967 1967 1967 1967 1967 1967 1967 1967 1966 1966
Latest Entry
2024 2024 2024 2023 2023 2023 2023 2023 2023 2023 2023 2023 2024

Station Details

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

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A very wet weekend for southeast Qld, northeast NSW

11:48 AEST A prolonged rainfall event is set to bring large totals to parts of NSW and Qld from Saturday, with possible heavy falls and flooding.  A low-pressure system in the Coral Sea, a deepening coastal trough and persistent easterlies will bring moisture-laden air into southeast Qld and northeast NSW will bring days of rainfall to the region.  While there is not a drop of rain on the radar over southeast Qld and Northeast NSW on Friday morning, the mass of cloud associated with a low in the Coral Sea will enhance rainfall over the weekend.

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