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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 101°F, while the coldest is July averaging around 46°F at night. Precipitation totals about 18 inches a year and is strongly seasonal — January alone averages 4.8 inches while August barely receives 0.09 inches.
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 (°F) | 98 | 97 | 96 | 91 | 83 | 77 | 78 | 82 | 90 | — | 99 | 101 |
| Avg temp (°F) | 86 | 85 | 83 | 78 | 70 | 63 | 62 | 65 | 73 | — | 84 | 87 |
| Avg low (°F) | 73 | 73 | 70 | 65 | 55 | 48 | 46 | 47 | 55 | — | 69 | 73 |
| Precipitation (in) | 4.8 | 4.1 | 2.6 | 0.5 | 0.3 | 0.4 | 0.1 | 0.1 | 0.4 | 0.7 | 1.7 | 3.0 |
| Jan – Jun | Jan | Feb | Mar | Apr | May | Jun |
|---|---|---|---|---|---|---|
| Avg high (°F) | 98 | 97 | 96 | 91 | 83 | 77 |
| Avg temp (°F) | 86 | 85 | 83 | 78 | 70 | 63 |
| Avg low (°F) | 73 | 73 | 70 | 65 | 55 | 48 |
| Precipitation (in) | 4.8 | 4.1 | 2.6 | 0.5 | 0.3 | 0.4 |
| Jul – Dec | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|
| Avg high (°F) | 78 | 82 | 90 | — | 99 | 101 |
| Avg temp (°F) | 62 | 65 | 73 | — | 84 | 87 |
| Avg low (°F) | 46 | 47 | 55 | — | 69 | 73 |
| Precipitation (in) | 0.1 | 0.1 | 0.4 | 0.7 | 1.7 | 3.0 |
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 ≥ 90°F (days) | 20 | 17 | 19 | 15 | 3 | 0.3 | 0.3 | 3 | 13 | 19 | 20 | 20 |
| Days with low ≤ 32°F (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 ≥ 90°F (days) | 20 | 17 | 19 | 15 | 3 | 0.3 |
| Days with low ≤ 32°F (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 ≥ 90°F (days) | 0.3 | 3 | 13 | 19 | 20 | 20 |
| Days with low ≤ 32°F (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.