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Mount Isa, Queensland climate
BSh Hot semi-arid
Mount Isa has a mildly seasonal tropical climate (Hot semi-arid, Köppen BSh). The hottest month is December with an average daily high near 38°C, while the coldest is July averaging around 8°C at night. Precipitation totals about 470 mm a year and is strongly seasonal — January alone averages 121 mm while August barely receives 2 mm.
Temperature & precipitation
Daily high–low temperature range with the monthly average, plus monthly precipitation · 1991–2020 normals · hover a month for the exact figuresHours of sunshine per day
Estimated sunny hours each month — daylight length × clear-sky fraction · 1991–2020 monthly cloud cover (NASA POWER)Mount Isa climate normals (1991–2020)
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg high (°C) | 37 | 36 | 35 | 33 | 28 | 25 | 26 | 28 | 32 | — | 37 | 38 |
| Avg temp (°C) | 30 | 30 | 28 | 26 | 21 | 17 | 17 | 18 | 23 | — | 29 | 31 |
| Avg low (°C) | 23 | 23 | 21 | 18 | 13 | 9 | 8 | 8 | 13 | — | 21 | 23 |
| Precipitation (mm) | 121 | 104 | 65 | 12 | 7 | 9 | 3 | 2 | 10 | 17 | 43 | 77 |
| Jan – Jun | Jan | Feb | Mar | Apr | May | Jun |
|---|---|---|---|---|---|---|
| Avg high (°C) | 37 | 36 | 35 | 33 | 28 | 25 |
| Avg temp (°C) | 30 | 30 | 28 | 26 | 21 | 17 |
| Avg low (°C) | 23 | 23 | 21 | 18 | 13 | 9 |
| Precipitation (mm) | 121 | 104 | 65 | 12 | 7 | 9 |
| Jul – Dec | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|
| Avg high (°C) | 26 | 28 | 32 | — | 37 | 38 |
| Avg temp (°C) | 17 | 18 | 23 | — | 29 | 31 |
| Avg low (°C) | 8 | 8 | 13 | — | 21 | 23 |
| Precipitation (mm) | 3 | 2 | 10 | 17 | 43 | 77 |
How often — frequency of weather events
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Days with measurable rain (days) | 10 | 9 | 5 | 2 | 1 | 1 | 0.7 | 0.6 | 2 | 3 | 6 | 7 |
| Days with high ≥ 32°C (days) | 20 | 17 | 19 | 15 | 3 | 0.3 | 0.3 | 3 | 13 | 19 | 20 | 20 |
| Days with low ≤ 0°C (days) | — | — | — | — | — | 0.1 | 0.2 | 0.0 | — | — | — | — |
| Jan – Jun | Jan | Feb | Mar | Apr | May | Jun |
|---|---|---|---|---|---|---|
| Days with measurable rain (days) | 10 | 9 | 5 | 2 | 1 | 1 |
| Days with high ≥ 32°C (days) | 20 | 17 | 19 | 15 | 3 | 0.3 |
| Days with low ≤ 0°C (days) | — | — | — | — | — | 0.1 |
| Jul – Dec | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|
| Days with measurable rain (days) | 0.7 | 0.6 | 2 | 3 | 6 | 7 |
| Days with high ≥ 32°C (days) | 0.3 | 3 | 13 | 19 | 20 | 20 |
| Days with low ≤ 0°C (days) | 0.2 | 0.0 | — | — | — | — |
Sky & atmosphere
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Cloud cover (%) | 61 | 55 | 43 | 28 | 25 | 17 | 15 | 13 | 19 | 30 | 44 | 52 |
| Relative humidity (%) | 53 | 57 | 53 | 40 | 40 | 42 | 37 | 30 | 26 | 26 | 33 | 41 |
| Wind speed (mph) | 6.8 | 6.6 | 6.6 | 7.3 | 7.3 | 7.3 | 7.2 | 7.4 | 7.4 | 7.6 | 7.1 | 6.9 |
| Jan – Jun | Jan | Feb | Mar | Apr | May | Jun |
|---|---|---|---|---|---|---|
| Cloud cover (%) | 61 | 55 | 43 | 28 | 25 | 17 |
| Relative humidity (%) | 53 | 57 | 53 | 40 | 40 | 42 |
| Wind speed (mph) | 6.8 | 6.6 | 6.6 | 7.3 | 7.3 | 7.3 |
| Jul – Dec | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|
| Cloud cover (%) | 15 | 13 | 19 | 30 | 44 | 52 |
| Relative humidity (%) | 37 | 30 | 26 | 26 | 33 | 41 |
| Wind speed (mph) | 7.2 | 7.4 | 7.4 | 7.6 | 7.1 | 6.9 |
Methodology & sources
Temperature & precipitation — 1991–2020 normals computed from 17 years of daily observations at Mount Isa Mine, a weather station, about 2 km from the city centre. The underlying daily records come from NOAA's global station network.
Cloud, humidity, wind & sunshine — modelled estimates from NASA POWER, NASA's satellite-and-reanalysis climatology. This is the standard global source for atmospheric variables, which are not measured at most weather stations.