Casa Grande climate — normals and trends
Casa Grande (United States) has a hot desert climate (BWh) under the Köppen-Geiger classification. Its mean annual temperature is 22.3 °C and it receives 203 mm of precipitation per year.
These figures are normals computed over 86 complete calendar years, from 1940 to 2025, using ERA5 reanalysis data from the Copernicus programme.
The warmest month is July (33.9 °C on average) and the coldest is January (11.2 °C). Rainfall peaks in August.
Casa Grande averages 5 frost days, 186 hot days (≥ 30 °C) and 32 rainy days per year.
Casa Grande has warmed by +2.7 °C between 1940 and 2025, or +0.32 °C per decade. This trend is statistically significant.
The number of frost days there went from about 10 to 0 per year over the period.
The hottest day of the period reached 48.1 °C (on 26 June 1990) and the coldest -6.1 °C (on 4 January 1949).
Data from ERA5 reanalysis (Copernicus Climate Change Service), redistributed under a CC-BY 4.0 licence. Normals are recomputed whenever the archive is updated.
Climate normals · ERA5
Casa GrandeArizona
- coords
- 32.88°, -111.76°
- period
- 1940–2025 · 86 yrs
Mean daily temperature
22.3°C
Average daily high
29.6°C
Average daily low
15.2°C
Annual rainfall
203mm
Sunshine / day
11.3h
Mean relative humidity
35%
Average peak wind
13.7km/h
Seasonal range
22.7°C
Frost days (< 0 °C)
5 d/yr
Hot days (≥ 30 °C)
186 d/yr
Rainy days (≥ 1 mm)
32 d/yr
Annual snowfall
0.0 cm
Average feels-like high
28.1 °C
Average feels-like low
13.1 °C
Average peak gust
28.5 km/h
Tropical nights (≥ 20 °C)
122 d/yr
Solar radiation
21.3 MJ/m²
Has the climate changed?
One stripe per year, 1940 to 2025
+2.7 °C
since 1940
+0.3 °C per decade · r² = 0.75 · p = < 0.001
Trend fitted by linear regression (ordinary least squares) on annual means. A trend is shown only when it is statistically significant (p < 0.05).
A climograph overlays rainfall (bars) and temperature (line): the standard reading in climatology, where you can see at a glance whether the warm season is also the dry one.
Records for the period
Hottest day
48.1 °C
26 June 1990
Coldest day
-6.1 °C
4 January 1949
Wettest day
62 mm
18 September 1985
Windiest day
41.9 km/h
25 April 1984
Strongest gust
94.3 km/h
21 January 2010
Hottest feels-like
48.7 °C
26 June 1990
Coldest feels-like
-10.3 °C
13 January 1963
Snowiest day
0.3 cm
22 December 1990
Sunniest day
14.0 h
24 June 2023
Normals computed over complete calendar years 1940–2025.
A specific year
Pick a year and see how it compares to normal — warmer, drier or more extreme than usual?
Across the whole year
Month by month
| High | vs. normal | Precipitation | vs. normal | |
|---|---|---|---|---|
| Jan | 18.5 °C | +0.1 °C | 3 mm | -22 mm |
| Feb | 25.2 °C | +4.2 °C | 0 mm | -22 mm |
| Mar | 25.6 °C | +1.3 °C | 26 mm | +6 mm |
| Apr | 29.4 °C | +0.4 °C | 1 mm | -5 mm |
| May | 34.3 °C | +0.4 °C | 4 mm | +2 mm |
| Jun | 40.6 °C | +1.2 °C | 10 mm | +8 mm |
| Jul | 41.0 °C | +0.5 °C | 17 mm | -1 mm |
| Aug | 42.0 °C | +2.8 °C | 9 mm | -21 mm |
| Sep | 37.1 °C | +0.2 °C | 38 mm | +15 mm |
| Oct | 31.0 °C | +0.2 °C | 28 mm | +14 mm |
| Nov | 25.7 °C | +2.1 °C | 33 mm | +18 mm |
| Dec | 22.9 °C | +4.3 °C | 3 mm | -22 mm |
The year's extremes
What was the weather like that day?
Your birthday, a wedding, a memorable trip: discover the actual weather for any date since 1940.
Frequently asked questions
What is the climate of Casa Grande?
Casa Grande has a hot desert climate (Köppen BWh). Over 1940-2025, the average annual temperature is 22.3 °C and it receives 203 mm of precipitation per year.
What is the hottest day ever recorded in Casa Grande?
The hottest day measured in Casa Grande between 1940 and 2025 was 26 June 1990, reaching 48.1 °C.
What is the coldest day in Casa Grande?
The coldest day measured in Casa Grande between 1940 and 2025 was 4 January 1949, at -6.1 °C.
Does it snow in Casa Grande?
Almost never: Casa Grande sees virtually no snow, with about 5 frost days per year.
Has the climate of Casa Grande warmed?
Yes: Casa Grande warmed by +2.7 °C between 1940 and 2025, a statistically significant trend.
What is the wettest day in Casa Grande?
The wettest day measured in Casa Grande between 1940 and 2025 was 18 September 1985, with 62 mm of rain in 24 hours.
What was the windiest day in Casa Grande?
The windiest day measured in Casa Grande between 1940 and 2025 was 25 April 1984, with winds reaching 41.9 km/h.
What is the warmest month in Casa Grande?
The warmest month in Casa Grande is July (33.9 °C on average); the coldest is January (11.2 °C).
How much does it rain in Casa Grande?
Casa Grande receives on average 203 mm of precipitation per year, spread over about 32 rainy days.
Is it sunny in Casa Grande?
Casa Grande gets on average 11.3 hours of sunshine per day, roughly 4,125 hours per year over 1940-2025.
What is the biggest single-day snowfall in Casa Grande?
The heaviest 24-hour snowfall measured in Casa Grande between 1940 and 2025 was 22 December 1990, with 0.3 cm.
Are there tropical nights in Casa Grande?
Yes: Casa Grande has on average 122 tropical nights per year (temperature staying above 20 °C), over 1940-2025.
What was the most extreme apparent temperature in Casa Grande?
In Casa Grande, between 1940 and 2025, the highest apparent temperature reached 48.7 °C on 26 June 1990, and the lowest was -10.3 °C on 13 January 1963.
Compare Casa Grande with another city
Pick a second city: its normals will be set against these, indicator by indicator.
Nearby cities
The climate around Casa Grande