Deer Valley climate — normals and trends
Deer Valley (United States) has a hot desert climate (BWh) under the Köppen-Geiger classification. Its mean annual temperature is 21.7 °C and it receives 240 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 (33.4 °C on average) and the coldest is January (10.7 °C). Rainfall peaks in January.
Deer Valley averages 4 frost days, 168 hot days (≥ 30 °C) and 32 rainy days per year.
Deer Valley 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 9 to 0 per year over the period.
The hottest day of the period reached 47.8 °C (on 28 July 1995) and the coldest -7.5 °C (on 22 December 1968).
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
Deer ValleyArizona
- coords
- 33.68°, -112.13°
- period
- 1940–2025 · 86 yrs
Mean daily temperature
21.7°C
Average daily high
28.1°C
Average daily low
15.1°C
Annual rainfall
240mm
Sunshine / day
11.3h
Mean relative humidity
36%
Average peak wind
15.6km/h
Seasonal range
22.7°C
Frost days (< 0 °C)
4 d/yr
Hot days (≥ 30 °C)
168 d/yr
Rainy days (≥ 1 mm)
32 d/yr
Annual snowfall
0.3 cm
Average feels-like high
26.0 °C
Average feels-like low
12.6 °C
Average peak gust
29.9 km/h
Tropical nights (≥ 20 °C)
121 d/yr
Solar radiation
21.0 MJ/m²
Has the climate changed?
One stripe per year, 1940 to 2025
+2.7 °C
since 1940
+0.3 °C per decade · r² = 0.73 · 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
47.8 °C
28 July 1995
Coldest day
-7.5 °C
22 December 1968
Wettest day
101 mm
5 September 1970
Windiest day
44.4 km/h
26 October 1993
Strongest gust
92.5 km/h
21 January 2010
Hottest feels-like
47.1 °C
26 June 1990
Coldest feels-like
-12.3 °C
22 December 1968
Snowiest day
4.6 cm
3 February 1985
Sunniest day
14.2 h
20 June 2022
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 | 17.7 °C | +0.5 °C | 1 mm | -32 mm |
| Feb | 23.7 °C | +4.4 °C | 3 mm | -28 mm |
| Mar | 23.3 °C | +0.8 °C | 53 mm | +24 mm |
| Apr | 27.3 °C | +0.1 °C | 5 mm | -6 mm |
| May | 32.4 °C | +0.3 °C | 7 mm | +5 mm |
| Jun | 38.8 °C | +1.2 °C | 9 mm | +7 mm |
| Jul | 39.8 °C | +0.5 °C | 4 mm | -9 mm |
| Aug | 40.4 °C | +2.3 °C | 7 mm | -17 mm |
| Sep | 35.1 °C | -0.3 °C | 37 mm | +15 mm |
| Oct | 29.6 °C | +0.4 °C | 21 mm | +0 mm |
| Nov | 24.0 °C | +1.8 °C | 62 mm | +40 mm |
| Dec | 21.0 °C | +3.6 °C | 8 mm | -23 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 Deer Valley?
Deer Valley has a hot desert climate (Köppen BWh). Over 1940-2025, the average annual temperature is 21.7 °C and it receives 240 mm of precipitation per year.
What is the hottest day ever recorded in Deer Valley?
The hottest day measured in Deer Valley between 1940 and 2025 was 28 July 1995, reaching 47.8 °C.
What is the coldest day in Deer Valley?
The coldest day measured in Deer Valley between 1940 and 2025 was 22 December 1968, at -7.5 °C.
Does it snow in Deer Valley?
Almost never: Deer Valley sees virtually no snow, with about 4 frost days per year.
Has the climate of Deer Valley warmed?
Yes: Deer Valley warmed by +2.7 °C between 1940 and 2025, a statistically significant trend.
What is the wettest day in Deer Valley?
The wettest day measured in Deer Valley between 1940 and 2025 was 5 September 1970, with 101 mm of rain in 24 hours.
What was the windiest day in Deer Valley?
The windiest day measured in Deer Valley between 1940 and 2025 was 26 October 1993, with winds reaching 44.4 km/h.
What is the warmest month in Deer Valley?
The warmest month in Deer Valley is July (33.4 °C on average); the coldest is January (10.7 °C).
How much does it rain in Deer Valley?
Deer Valley receives on average 240 mm of precipitation per year, spread over about 32 rainy days.
Is it sunny in Deer Valley?
Deer Valley 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 Deer Valley?
The heaviest 24-hour snowfall measured in Deer Valley between 1940 and 2025 was 3 February 1985, with 4.6 cm.
Are there tropical nights in Deer Valley?
Yes: Deer Valley has on average 121 tropical nights per year (temperature staying above 20 °C), over 1940-2025.
What was the most extreme apparent temperature in Deer Valley?
In Deer Valley, between 1940 and 2025, the highest apparent temperature reached 47.1 °C on 26 June 1990, and the lowest was -12.3 °C on 22 December 1968.
Compare Deer Valley with another city
Pick a second city: its normals will be set against these, indicator by indicator.
Nearby cities
The climate around Deer Valley