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San Tan Valley, Arizona climate
BWh Hot desert
San Tan Valley has a seasonal warm-temperate climate (Hot desert, Köppen BWh). The hottest month is July with an average daily high near 105°F, while the coldest is December averaging around 41°F at night. Precipitation totals about 9 inches a year and is strongly seasonal — January alone averages 1.4 inches while June barely receives 0.04 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 countsSan Tan Valley climate normals (1991–2020)
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg high (°F) | 68 | 71 | 79 | 86 | 94 | 103 | 105 | 103 | 99 | 89 | 77 | 67 |
| Avg temp (°F) | 55 | 57 | 64 | 70 | 78 | 87 | 92 | 90 | 85 | 74 | 63 | 54 |
| Avg low (°F) | 42 | 44 | 49 | 53 | 61 | 70 | 78 | 78 | 72 | 60 | 48 | 41 |
| Precipitation (in) | 1.4 | 0.9 | 1.2 | 0.3 | 0.4 | 0.0 | 1.2 | 1.1 | 0.3 | 0.5 | 0.5 | 1.0 |
| Jan – Jun | Jan | Feb | Mar | Apr | May | Jun |
|---|---|---|---|---|---|---|
| Avg high (°F) | 68 | 71 | 79 | 86 | 94 | 103 |
| Avg temp (°F) | 55 | 57 | 64 | 70 | 78 | 87 |
| Avg low (°F) | 42 | 44 | 49 | 53 | 61 | 70 |
| Precipitation (in) | 1.4 | 0.9 | 1.2 | 0.3 | 0.4 | 0.0 |
| Jul – Dec | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|
| Avg high (°F) | 105 | 103 | 99 | 89 | 77 | 67 |
| Avg temp (°F) | 92 | 90 | 85 | 74 | 63 | 54 |
| Avg low (°F) | 78 | 78 | 72 | 60 | 48 | 41 |
| Precipitation (in) | 1.2 | 1.1 | 0.3 | 0.5 | 0.5 | 1.0 |
How often — frequency of weather events
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Days with measurable rain (days) | 3 | 3 | 3 | 0.8 | 1 | 0.3 | 2 | 3 | 1 | 1 | 1 | 2 |
| Days with high ≥ 90°F (days) | — | — | 1 | 7 | 20 | 25 | 27 | 24 | 23 | 13 | 0.9 | — |
| Days with low ≤ 32°F (days) | 2 | 0.9 | 0.4 | — | — | — | — | — | — | — | 0.9 | 3 |
| Jan – Jun | Jan | Feb | Mar | Apr | May | Jun |
|---|---|---|---|---|---|---|
| Days with measurable rain (days) | 3 | 3 | 3 | 0.8 | 1 | 0.3 |
| Days with high ≥ 90°F (days) | — | — | 1 | 7 | 20 | 25 |
| Days with low ≤ 32°F (days) | 2 | 0.9 | 0.4 | — | — | — |
| Jul – Dec | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|
| Days with measurable rain (days) | 2 | 3 | 1 | 1 | 1 | 2 |
| Days with high ≥ 90°F (days) | 27 | 24 | 23 | 13 | 0.9 | — |
| Days with low ≤ 32°F (days) | — | — | — | — | 0.9 | 3 |
Sky & atmosphere
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Cloud cover (%) | 42 | 44 | 38 | 30 | 25 | 20 | 46 | 45 | 29 | 27 | 32 | 42 |
| Clear days (≤ 30% cloud) | 14 | 12 | 15 | 18 | 21 | 23 | 10 | 11 | 18 | 20 | 17 | 14 |
| Partly cloudy days (30–70%) | 9 | 8 | 9 | 8 | 8 | 5 | 14 | 14 | 8 | 6 | 7 | 8 |
| Cloudy days (≥ 70%) | 8 | 8 | 7 | 4 | 3 | 2 | 8 | 7 | 4 | 5 | 5 | 8 |
| Relative humidity (%) | 49 | 47 | 41 | 32 | 24 | 18 | 34 | 41 | 36 | 33 | 37 | 47 |
| Wind speed (mph) | 5.2 | 5.0 | 5.0 | 5.4 | 5.4 | 5.3 | 4.7 | 4.1 | 4.7 | 5.0 | 5.3 | 5.2 |
| Jan – Jun | Jan | Feb | Mar | Apr | May | Jun |
|---|---|---|---|---|---|---|
| Cloud cover (%) | 42 | 44 | 38 | 30 | 25 | 20 |
| Clear days (≤ 30% cloud) | 14 | 12 | 15 | 18 | 21 | 23 |
| Partly cloudy days (30–70%) | 9 | 8 | 9 | 8 | 8 | 5 |
| Cloudy days (≥ 70%) | 8 | 8 | 7 | 4 | 3 | 2 |
| Relative humidity (%) | 49 | 47 | 41 | 32 | 24 | 18 |
| Wind speed (mph) | 5.2 | 5.0 | 5.0 | 5.4 | 5.4 | 5.3 |
| Jul – Dec | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|
| Cloud cover (%) | 46 | 45 | 29 | 27 | 32 | 42 |
| Clear days (≤ 30% cloud) | 10 | 11 | 18 | 20 | 17 | 14 |
| Partly cloudy days (30–70%) | 14 | 14 | 8 | 6 | 7 | 8 |
| Cloudy days (≥ 70%) | 8 | 7 | 4 | 5 | 5 | 8 |
| Relative humidity (%) | 34 | 41 | 36 | 33 | 37 | 47 |
| Wind speed (mph) | 4.7 | 4.1 | 4.7 | 5.0 | 5.3 | 5.2 |
Methodology & sources
Temperature & precipitation — the official 1991–2020 climate normals from NOAA's U.S. Climate Normals, measured at Florence (NOAA GHCN station USC00023027), about 22 km from the city centre.
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.