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Casa Grande, Arizona climate
BWh Hot desert
Casa Grande has a seasonal warm-temperate climate (Hot desert, Köppen BWh). The hottest month is July with an average daily high near 107°F, while the coldest is December averaging around 38°F at night. Precipitation totals about 8 inches a year and is strongly seasonal — August alone averages 1.5 inches while May barely receives 0.18 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 countsCasa Grande climate normals (1991–2020)
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg high (°F) | 69 | 73 | 80 | 88 | 96 | 106 | 107 | 105 | 100 | 91 | 78 | 68 |
| Avg temp (°F) | 54 | 57 | 64 | 70 | 78 | 88 | 93 | 91 | 86 | 74 | 61 | 53 |
| Avg low (°F) | 39 | 42 | 47 | 53 | 60 | 70 | 78 | 77 | 71 | 57 | 45 | 38 |
| Precipitation (in) | 0.8 | 1.0 | 0.8 | 0.2 | 0.2 | 0.2 | 0.9 | 1.5 | 0.7 | 0.5 | 0.4 | 0.7 |
| Jan – Jun | Jan | Feb | Mar | Apr | May | Jun |
|---|---|---|---|---|---|---|
| Avg high (°F) | 69 | 73 | 80 | 88 | 96 | 106 |
| Avg temp (°F) | 54 | 57 | 64 | 70 | 78 | 88 |
| Avg low (°F) | 39 | 42 | 47 | 53 | 60 | 70 |
| Precipitation (in) | 0.8 | 1.0 | 0.8 | 0.2 | 0.2 | 0.2 |
| Jul – Dec | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|
| Avg high (°F) | 107 | 105 | 100 | 91 | 78 | 68 |
| Avg temp (°F) | 93 | 91 | 86 | 74 | 61 | 53 |
| Avg low (°F) | 78 | 77 | 71 | 57 | 45 | 38 |
| Precipitation (in) | 0.9 | 1.5 | 0.7 | 0.5 | 0.4 | 0.7 |
How often — frequency of weather events
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Days with measurable rain (days) | 3 | 4 | 3 | 1 | 1 | 0.6 | 3 | 4 | 2 | 2 | 2 | 3 |
| Days with high ≥ 90°F (days) | — | — | 2 | 10 | 22 | 26 | 27 | 24 | 24 | 14 | 2 | — |
| Days with low ≤ 32°F (days) | 4 | 2 | 0.4 | — | — | 0.0 | — | — | — | 0.0 | 1 | 6 |
| Jan – Jun | Jan | Feb | Mar | Apr | May | Jun |
|---|---|---|---|---|---|---|
| Days with measurable rain (days) | 3 | 4 | 3 | 1 | 1 | 0.6 |
| Days with high ≥ 90°F (days) | — | — | 2 | 10 | 22 | 26 |
| Days with low ≤ 32°F (days) | 4 | 2 | 0.4 | — | — | 0.0 |
| Jul – Dec | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|
| Days with measurable rain (days) | 3 | 4 | 2 | 2 | 2 | 3 |
| Days with high ≥ 90°F (days) | 27 | 24 | 24 | 14 | 2 | — |
| Days with low ≤ 32°F (days) | — | — | — | 0.0 | 1 | 6 |
Sky & atmosphere
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Cloud cover (%) | 41 | 43 | 37 | 28 | 24 | 21 | 51 | 49 | 30 | 26 | 32 | 41 |
| Clear days (≤ 30% cloud) | 14 | 12 | 16 | 19 | 21 | 22 | 8 | 9 | 18 | 21 | 17 | 14 |
| Partly cloudy days (30–70%) | 9 | 9 | 9 | 8 | 7 | 6 | 13 | 13 | 8 | 6 | 8 | 10 |
| Cloudy days (≥ 70%) | 7 | 7 | 6 | 3 | 3 | 2 | 10 | 8 | 4 | 4 | 5 | 7 |
| Relative humidity (%) | 48 | 46 | 40 | 30 | 23 | 17 | 30 | 36 | 34 | 31 | 36 | 47 |
| Wind speed (mph) | 4.2 | 4.3 | 4.4 | 5.0 | 5.0 | 5.1 | 4.5 | 3.8 | 4.1 | 4.2 | 4.3 | 4.1 |
| Jan – Jun | Jan | Feb | Mar | Apr | May | Jun |
|---|---|---|---|---|---|---|
| Cloud cover (%) | 41 | 43 | 37 | 28 | 24 | 21 |
| Clear days (≤ 30% cloud) | 14 | 12 | 16 | 19 | 21 | 22 |
| Partly cloudy days (30–70%) | 9 | 9 | 9 | 8 | 7 | 6 |
| Cloudy days (≥ 70%) | 7 | 7 | 6 | 3 | 3 | 2 |
| Relative humidity (%) | 48 | 46 | 40 | 30 | 23 | 17 |
| Wind speed (mph) | 4.2 | 4.3 | 4.4 | 5.0 | 5.0 | 5.1 |
| Jul – Dec | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|
| Cloud cover (%) | 51 | 49 | 30 | 26 | 32 | 41 |
| Clear days (≤ 30% cloud) | 8 | 9 | 18 | 21 | 17 | 14 |
| Partly cloudy days (30–70%) | 13 | 13 | 8 | 6 | 8 | 10 |
| Cloudy days (≥ 70%) | 10 | 8 | 4 | 4 | 5 | 7 |
| Relative humidity (%) | 30 | 36 | 34 | 31 | 36 | 47 |
| Wind speed (mph) | 4.5 | 3.8 | 4.1 | 4.2 | 4.3 | 4.1 |
Methodology & sources
Temperature & precipitation — the official 1991–2020 climate normals from NOAA's U.S. Climate Normals, measured at Casa Grande (NOAA GHCN station USC00021306), about 4 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.