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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 36°C, while the coldest is July averaging around 14°C at night. Precipitation totals about 317 mm a year and is strongly seasonal — February alone averages 89 mm while October barely receives 0 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)Karratha climate normals (1991–2020)
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg high (°C) | 36 | 36 | 36 | 34 | 30 | 27 | 27 | 28 | 31 | 34 | 35 | 36 |
| Avg temp (°C) | 31 | 31 | 31 | 29 | 24 | 21 | 20 | 21 | 24 | 28 | 29 | 31 |
| Avg low (°C) | 27 | 27 | 26 | 23 | 18 | 15 | 14 | 14 | 17 | 21 | 23 | 26 |
| Precipitation (mm) | 57 | 89 | 52 | 16 | 28 | 42 | 12 | 3 | 1 | 0 | 2 | 16 |
| Jan – Jun | Jan | Feb | Mar | Apr | May | Jun |
|---|---|---|---|---|---|---|
| Avg high (°C) | 36 | 36 | 36 | 34 | 30 | 27 |
| Avg temp (°C) | 31 | 31 | 31 | 29 | 24 | 21 |
| Avg low (°C) | 27 | 27 | 26 | 23 | 18 | 15 |
| Precipitation (mm) | 57 | 89 | 52 | 16 | 28 | 42 |
| Jul – Dec | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|
| Avg high (°C) | 27 | 28 | 31 | 34 | 35 | 36 |
| Avg temp (°C) | 20 | 21 | 24 | 28 | 29 | 31 |
| Avg low (°C) | 14 | 14 | 17 | 21 | 23 | 26 |
| Precipitation (mm) | 12 | 3 | 1 | 0 | 2 | 16 |
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 ≥ 32°C (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 ≥ 32°C (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 ≥ 32°C (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 (m/s) | 5.0 | 4.7 | 4.3 | 4.0 | 4.5 | 4.9 | 4.6 | 4.4 | 4.7 | 4.8 | 5.2 | 5.1 |
| 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 (m/s) | 5.0 | 4.7 | 4.3 | 4.0 | 4.5 | 4.9 |
| 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 (m/s) | 4.6 | 4.4 | 4.7 | 4.8 | 5.2 | 5.1 |
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.