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Barstow, California climate
BWh Hot desert
Barstow has a seasonal warm-temperate climate (Hot desert, Köppen BWh). The hottest month is July with an average daily high near 39°C, while the coldest is December averaging around 2°C at night. Precipitation totals about 126 mm a year and is strongly seasonal — February alone averages 25 mm while June barely receives 1 mm.
Temperature & precipitation
Daily high–low temperature range with the monthly average, plus monthly precipitation · 1991–2020 normals · hover a month for the exact figuresClear vs cloudy days
Share of days each month that are clear, partly cloudy or cloudy · 1991–2020 · hover a month for the day countsBarstow climate normals (1991–2020)
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg high (°C) | 15 | 17 | 21 | 25 | 30 | 36 | 39 | 38 | 34 | 27 | 20 | 14 |
| Avg temp (°C) | 8 | 11 | 14 | 17 | 22 | 27 | 31 | 30 | 26 | 19 | 13 | 8 |
| Avg low (°C) | 2 | 4 | 7 | 10 | 14 | 18 | 22 | 21 | 17 | 11 | 5 | 2 |
| Precipitation (mm) | 19 | 25 | 15 | 8 | 2 | 1 | 7 | 4 | 6 | 9 | 10 | 20 |
| Snowfall (cm) | — | — | — | — | — | — | — | — | — | — | — | 1 |
| Jan – Jun | Jan | Feb | Mar | Apr | May | Jun |
|---|---|---|---|---|---|---|
| Avg high (°C) | 15 | 17 | 21 | 25 | 30 | 36 |
| Avg temp (°C) | 8 | 11 | 14 | 17 | 22 | 27 |
| Avg low (°C) | 2 | 4 | 7 | 10 | 14 | 18 |
| Precipitation (mm) | 19 | 25 | 15 | 8 | 2 | 1 |
| Snowfall (cm) | — | — | — | — | — | — |
| Jul – Dec | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|
| Avg high (°C) | 39 | 38 | 34 | 27 | 20 | 14 |
| Avg temp (°C) | 31 | 30 | 26 | 19 | 13 | 8 |
| Avg low (°C) | 22 | 21 | 17 | 11 | 5 | 2 |
| Precipitation (mm) | 7 | 4 | 6 | 9 | 10 | 20 |
| Snowfall (cm) | — | — | — | — | — | 1 |
How often — frequency of weather events
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Days with measurable rain (days) | 4 | 4 | 2 | 1 | 0.7 | 0.2 | 1 | 0.9 | 0.9 | 1 | 2 | 3 |
| Days with high ≥ 32°C (days) | — | — | 0.2 | 3 | 12 | 24 | 29 | 30 | 24 | 6 | — | — |
| Days with low ≤ 0°C (days) | 9 | 4 | 1 | 0.2 | — | — | — | — | — | — | 3 | 12 |
| Days with snowfall ≥ 2.5 cm (days) | — | — | — | — | — | — | — | — | — | — | — | 0.1 |
| Jan – Jun | Jan | Feb | Mar | Apr | May | Jun |
|---|---|---|---|---|---|---|
| Days with measurable rain (days) | 4 | 4 | 2 | 1 | 0.7 | 0.2 |
| Days with high ≥ 32°C (days) | — | — | 0.2 | 3 | 12 | 24 |
| Days with low ≤ 0°C (days) | 9 | 4 | 1 | 0.2 | — | — |
| Days with snowfall ≥ 2.5 cm (days) | — | — | — | — | — | — |
| Jul – Dec | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|
| Days with measurable rain (days) | 1 | 0.9 | 0.9 | 1 | 2 | 3 |
| Days with high ≥ 32°C (days) | 29 | 30 | 24 | 6 | — | — |
| Days with low ≤ 0°C (days) | — | — | — | — | 3 | 12 |
| Days with snowfall ≥ 2.5 cm (days) | — | — | — | — | — | 0.1 |
Sky & atmosphere
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Cloud cover (%) | 46 | 43 | 38 | 31 | 26 | 16 | 19 | 16 | 16 | 24 | 33 | 43 |
| Clear days (≤ 30% cloud) | 11 | 12 | 15 | 17 | 20 | 25 | 24 | 26 | 24 | 22 | 17 | 13 |
| Partly cloudy days (30–70%) | 12 | 9 | 11 | 9 | 9 | 4 | 5 | 5 | 4 | 6 | 9 | 11 |
| Cloudy days (≥ 70%) | 8 | 7 | 6 | 4 | 2 | 1 | 2 | 0.9 | 1 | 3 | 4 | 7 |
| Relative humidity (%) | 53 | 53 | 49 | 42 | 36 | 26 | 24 | 24 | 28 | 33 | 41 | 51 |
| Wind speed (mph) | 5.2 | 6.1 | 6.9 | 8.1 | 8.4 | 8.7 | 7.7 | 6.9 | 6.1 | 5.9 | 5.4 | 5.3 |
| Jan – Jun | Jan | Feb | Mar | Apr | May | Jun |
|---|---|---|---|---|---|---|
| Cloud cover (%) | 46 | 43 | 38 | 31 | 26 | 16 |
| Clear days (≤ 30% cloud) | 11 | 12 | 15 | 17 | 20 | 25 |
| Partly cloudy days (30–70%) | 12 | 9 | 11 | 9 | 9 | 4 |
| Cloudy days (≥ 70%) | 8 | 7 | 6 | 4 | 2 | 1 |
| Relative humidity (%) | 53 | 53 | 49 | 42 | 36 | 26 |
| Wind speed (mph) | 5.2 | 6.1 | 6.9 | 8.1 | 8.4 | 8.7 |
| Jul – Dec | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|
| Cloud cover (%) | 19 | 16 | 16 | 24 | 33 | 43 |
| Clear days (≤ 30% cloud) | 24 | 26 | 24 | 22 | 17 | 13 |
| Partly cloudy days (30–70%) | 5 | 5 | 4 | 6 | 9 | 11 |
| Cloudy days (≥ 70%) | 2 | 0.9 | 1 | 3 | 4 | 7 |
| Relative humidity (%) | 24 | 24 | 28 | 33 | 41 | 51 |
| Wind speed (mph) | 7.7 | 6.9 | 6.1 | 5.9 | 5.4 | 5.3 |
Methodology & sources
Temperature & precipitation — the official 1991–2020 climate normals from NOAA's U.S. Climate Normals, measured at Barstow (NOAA GHCN station USC00040521), inside the city.
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.