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Saint George, Utah climate
BWk Cold desert
Saint George has a seasonal mild-temperate climate (Cold desert, Köppen BWk). The hottest month is July with an average daily high near 99°F, while the coldest is December averaging around 31°F at night. Precipitation totals about 5 inches a year and is strongly seasonal — March alone averages 1.2 inches while June 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 figuresClear vs cloudy days
Share of days each month that are clear, partly cloudy or cloudy · 1991–2020 · hover a month for the day countsSaint George climate normals (1991–2020)
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg high (°F) | 54 | 57 | 65 | 72 | 82 | 94 | 99 | 97 | 90 | 76 | 63 | 53 |
| Avg temp (°F) | 42 | 45 | 52 | 58 | 68 | 79 | 85 | 84 | 76 | 63 | 50 | 42 |
| Avg low (°F) | 31 | 33 | 38 | 44 | 54 | 64 | 72 | 71 | 62 | 49 | 38 | 31 |
| Precipitation (in) | 0.7 | 0.6 | 1.2 | 0.4 | 0.7 | 0.0 | 0.7 | 0.4 | 0.2 | 0.3 | 0.1 | 0.1 |
| Jan – Jun | Jan | Feb | Mar | Apr | May | Jun |
|---|---|---|---|---|---|---|
| Avg high (°F) | 54 | 57 | 65 | 72 | 82 | 94 |
| Avg temp (°F) | 42 | 45 | 52 | 58 | 68 | 79 |
| Avg low (°F) | 31 | 33 | 38 | 44 | 54 | 64 |
| Precipitation (in) | 0.7 | 0.6 | 1.2 | 0.4 | 0.7 | 0.0 |
| Jul – Dec | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|
| Avg high (°F) | 99 | 97 | 90 | 76 | 63 | 53 |
| Avg temp (°F) | 85 | 84 | 76 | 63 | 50 | 42 |
| Avg low (°F) | 72 | 71 | 62 | 49 | 38 | 31 |
| Precipitation (in) | 0.7 | 0.4 | 0.2 | 0.3 | 0.1 | 0.1 |
How often — frequency of weather events
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Days with measurable rain (days) | 2 | 4 | 6 | 3 | 3 | 0.5 | 2 | 2 | 2 | 2 | 2 | 3 |
| Days with high ≥ 90°F (days) | — | — | — | 2 | 10 | 26 | 29 | 28 | 20 | 3 | — | — |
| Days with low ≤ 32°F (days) | 14 | 12 | 2 | — | — | — | — | — | — | 1 | 6 | 22 |
| Jan – Jun | Jan | Feb | Mar | Apr | May | Jun |
|---|---|---|---|---|---|---|
| Days with measurable rain (days) | 2 | 4 | 6 | 3 | 3 | 0.5 |
| Days with high ≥ 90°F (days) | — | — | — | 2 | 10 | 26 |
| Days with low ≤ 32°F (days) | 14 | 12 | 2 | — | — | — |
| Jul – Dec | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|
| Days with measurable rain (days) | 2 | 2 | 2 | 2 | 2 | 3 |
| Days with high ≥ 90°F (days) | 29 | 28 | 20 | 3 | — | — |
| Days with low ≤ 32°F (days) | — | — | — | 1 | 6 | 22 |
Sky & atmosphere
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Cloud cover (%) | 49 | 52 | 48 | 45 | 41 | 26 | 38 | 34 | 27 | 33 | 40 | 49 |
| Clear days (≤ 30% cloud) | 11 | 9 | 11 | 11 | 13 | 20 | 14 | 16 | 19 | 19 | 14 | 10 |
| Partly cloudy days (30–70%) | 11 | 10 | 10 | 12 | 11 | 7 | 11 | 10 | 8 | 6 | 10 | 11 |
| Cloudy days (≥ 70%) | 9 | 10 | 10 | 7 | 7 | 4 | 6 | 5 | 3 | 6 | 6 | 10 |
| Relative humidity (%) | 53 | 50 | 43 | 36 | 29 | 20 | 27 | 30 | 29 | 33 | 42 | 51 |
| Wind speed (mph) | 5.1 | 5.3 | 5.7 | 6.2 | 6.0 | 6.2 | 5.1 | 5.0 | 5.1 | 5.1 | 5.0 | 4.9 |
| Jan – Jun | Jan | Feb | Mar | Apr | May | Jun |
|---|---|---|---|---|---|---|
| Cloud cover (%) | 49 | 52 | 48 | 45 | 41 | 26 |
| Clear days (≤ 30% cloud) | 11 | 9 | 11 | 11 | 13 | 20 |
| Partly cloudy days (30–70%) | 11 | 10 | 10 | 12 | 11 | 7 |
| Cloudy days (≥ 70%) | 9 | 10 | 10 | 7 | 7 | 4 |
| Relative humidity (%) | 53 | 50 | 43 | 36 | 29 | 20 |
| Wind speed (mph) | 5.1 | 5.3 | 5.7 | 6.2 | 6.0 | 6.2 |
| Jul – Dec | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|
| Cloud cover (%) | 38 | 34 | 27 | 33 | 40 | 49 |
| Clear days (≤ 30% cloud) | 14 | 16 | 19 | 19 | 14 | 10 |
| Partly cloudy days (30–70%) | 11 | 10 | 8 | 6 | 10 | 11 |
| Cloudy days (≥ 70%) | 6 | 5 | 3 | 6 | 6 | 10 |
| Relative humidity (%) | 27 | 30 | 29 | 33 | 42 | 51 |
| Wind speed (mph) | 5.1 | 5.0 | 5.1 | 5.1 | 5.0 | 4.9 |
Methodology & sources
Temperature — modelled for this location from ERA5-Land reanalysis, a ~9 km global grid, because no long-record weather station is close enough to use.
Precipitation — 1991–2020 normals computed from 3 years of daily observations at ST George Muni AP, a weather station, about 1 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.