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Karratha, Western Australia climate
BWh Hot desert
Karratha has a mildly seasonal tropical climate (Hot desert, Köppen BWh). The hottest month is January with an average daily high near 97°F, while the coldest is July averaging around 57°F at night. Precipitation totals about 12 inches a year and is strongly seasonal — February alone averages 3.5 inches while October barely receives 0.01 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)Karratha climate normals (1991–2020)
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg high (°F) | 97 | 96 | 97 | 94 | 86 | 80 | 80 | 83 | 88 | 93 | 95 | 97 |
| Avg temp (°F) | 89 | 88 | 88 | 84 | 76 | 70 | 68 | 70 | 75 | 82 | 84 | 87 |
| Avg low (°F) | 80 | 80 | 79 | 73 | 65 | 59 | 57 | 58 | 63 | 70 | 74 | 78 |
| Precipitation (in) | 2.2 | 3.5 | 2.0 | 0.6 | 1.1 | 1.7 | 0.5 | 0.1 | 0.0 | 0.0 | 0.1 | 0.6 |
| Jan – Jun | Jan | Feb | Mar | Apr | May | Jun |
|---|---|---|---|---|---|---|
| Avg high (°F) | 97 | 96 | 97 | 94 | 86 | 80 |
| Avg temp (°F) | 89 | 88 | 88 | 84 | 76 | 70 |
| Avg low (°F) | 80 | 80 | 79 | 73 | 65 | 59 |
| Precipitation (in) | 2.2 | 3.5 | 2.0 | 0.6 | 1.1 | 1.7 |
| Jul – Dec | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|
| Avg high (°F) | 80 | 83 | 88 | 93 | 95 | 97 |
| Avg temp (°F) | 68 | 70 | 75 | 82 | 84 | 87 |
| Avg low (°F) | 57 | 58 | 63 | 70 | 74 | 78 |
| Precipitation (in) | 0.5 | 0.1 | 0.0 | 0.0 | 0.1 | 0.6 |
How often — frequency of weather events
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Days with measurable rain (days) | 4 | 5 | 4 | 2 | 3 | 3 | 2 | 0.8 | 0.3 | 0.2 | 0.4 | 1 |
| Days with high ≥ 90°F (days) | 25 | 22 | 25 | 23 | 7 | 0.3 | 0.2 | 2 | 10 | 20 | 21 | 25 |
| Jan – Jun | Jan | Feb | Mar | Apr | May | Jun |
|---|---|---|---|---|---|---|
| Days with measurable rain (days) | 4 | 5 | 4 | 2 | 3 | 3 |
| Days with high ≥ 90°F (days) | 25 | 22 | 25 | 23 | 7 | 0.3 |
| Jul – Dec | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|
| Days with measurable rain (days) | 2 | 0.8 | 0.3 | 0.2 | 0.4 | 1 |
| Days with high ≥ 90°F (days) | 0.2 | 2 | 10 | 20 | 21 | 25 |
Sky & atmosphere
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Cloud cover (%) | 47 | 50 | 41 | 39 | 39 | 41 | 30 | 21 | 18 | 18 | 21 | 32 |
| Relative humidity (%) | 72 | 74 | 69 | 63 | 60 | 61 | 60 | 60 | 61 | 61 | 64 | 69 |
| Wind speed (mph) | 11.1 | 10.6 | 9.7 | 9.0 | 10.1 | 11.0 | 10.4 | 9.8 | 10.4 | 10.8 | 11.6 | 11.5 |
| Jan – Jun | Jan | Feb | Mar | Apr | May | Jun |
|---|---|---|---|---|---|---|
| Cloud cover (%) | 47 | 50 | 41 | 39 | 39 | 41 |
| Relative humidity (%) | 72 | 74 | 69 | 63 | 60 | 61 |
| Wind speed (mph) | 11.1 | 10.6 | 9.7 | 9.0 | 10.1 | 11.0 |
| Jul – Dec | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|
| Cloud cover (%) | 30 | 21 | 18 | 18 | 21 | 32 |
| Relative humidity (%) | 60 | 60 | 61 | 61 | 64 | 69 |
| Wind speed (mph) | 10.4 | 9.8 | 10.4 | 10.8 | 11.6 | 11.5 |
Methodology & sources
Temperature & precipitation — 1991–2020 normals computed from 27 years of daily observations at Karratha Aero, a weather station, about 8 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.