Phoenix climate — normals and trends
Phoenix (United States) has a hot desert climate (BWh) under the Köppen-Geiger classification. Its mean annual temperature is 22.4 °C and it receives 248 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 (34.5 °C on average) and the coldest is January (10.9 °C). Rainfall peaks in August.
Phoenix averages 5 frost days, 181 hot days (≥ 30 °C) and 33 rainy days per year.
Phoenix 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 11 to 0 per year over the period.
The hottest day of the period reached 48.7 °C (on 26 June 1990) and the coldest -6.6 °C (on 14 January 1963).
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
PhoenixArizona
- coords
- 33.45°, -112.07°
- period
- 1940–2025 · 86 yrs
Mean daily temperature
22.4°C
Average daily high
29.3°C
Average daily low
15.4°C
Annual rainfall
248mm
Sunshine / day
11.2h
Mean relative humidity
35%
Average peak wind
14.7km/h
Seasonal range
23.6°C
Frost days (< 0 °C)
5 d/yr
Hot days (≥ 30 °C)
181 d/yr
Rainy days (≥ 1 mm)
33 d/yr
Annual snowfall
0.1 cm
Average feels-like high
27.6 °C
Average feels-like low
13.2 °C
Average peak gust
28.3 km/h
Tropical nights (≥ 20 °C)
128 d/yr
Solar radiation
21.1 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
48.7 °C
26 June 1990
Coldest day
-6.6 °C
14 January 1963
Wettest day
87 mm
5 September 1970
Windiest day
45.3 km/h
8 April 2013
Strongest gust
92.5 km/h
21 January 2010
Hottest feels-like
48.7 °C
26 June 1990
Coldest feels-like
-12.0 °C
13 January 1963
Snowiest day
3.1 cm
3 February 1985
Sunniest day
14.2 h
17 June 1944
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 | +0.4 °C | 1 mm | -30 mm |
| Feb | 24.9 °C | +4.4 °C | 1 mm | -28 mm |
| Mar | 24.8 °C | +1.0 °C | 43 mm | +16 mm |
| Apr | 28.9 °C | +0.3 °C | 2 mm | -8 mm |
| May | 33.9 °C | +0.3 °C | 7 mm | +4 mm |
| Jun | 40.4 °C | +1.3 °C | 12 mm | +9 mm |
| Jul | 41.1 °C | +0.5 °C | 13 mm | -4 mm |
| Aug | 41.8 °C | +2.5 °C | 8 mm | -23 mm |
| Sep | 36.4 °C | -0.3 °C | 46 mm | +19 mm |
| Oct | 30.7 °C | +0.3 °C | 27 mm | +5 mm |
| Nov | 25.1 °C | +1.9 °C | 51 mm | +32 mm |
| Dec | 22.0 °C | +3.8 °C | 7 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 Phoenix?
Phoenix has a hot desert climate (Köppen BWh). Over 1940-2025, the average annual temperature is 22.4 °C and it receives 248 mm of precipitation per year.
What is the hottest day ever recorded in Phoenix?
The hottest day measured in Phoenix between 1940 and 2025 was 26 June 1990, reaching 48.7 °C.
What is the coldest day in Phoenix?
The coldest day measured in Phoenix between 1940 and 2025 was 14 January 1963, at -6.6 °C.
Does it snow in Phoenix?
Almost never: Phoenix sees virtually no snow, with about 5 frost days per year.
Has the climate of Phoenix warmed?
Yes: Phoenix warmed by +2.7 °C between 1940 and 2025, a statistically significant trend.
What is the wettest day in Phoenix?
The wettest day measured in Phoenix between 1940 and 2025 was 5 September 1970, with 87 mm of rain in 24 hours.
What was the windiest day in Phoenix?
The windiest day measured in Phoenix between 1940 and 2025 was 8 April 2013, with winds reaching 45.3 km/h.
What is the warmest month in Phoenix?
The warmest month in Phoenix is July (34.5 °C on average); the coldest is January (10.9 °C).
How much does it rain in Phoenix?
Phoenix receives on average 248 mm of precipitation per year, spread over about 33 rainy days.
Is it sunny in Phoenix?
Phoenix gets on average 11.2 hours of sunshine per day, roughly 4,088 hours per year over 1940-2025.
What is the biggest single-day snowfall in Phoenix?
The heaviest 24-hour snowfall measured in Phoenix between 1940 and 2025 was 3 February 1985, with 3.1 cm.
Are there tropical nights in Phoenix?
Yes: Phoenix has on average 128 tropical nights per year (temperature staying above 20 °C), over 1940-2025.
What was the most extreme apparent temperature in Phoenix?
In Phoenix, between 1940 and 2025, the highest apparent temperature reached 48.7 °C on 26 June 1990, and the lowest was -12.0 °C on 13 January 1963.
Compare Phoenix with another city
Pick a second city: its normals will be set against these, indicator by indicator.
Nearby cities
The climate around Phoenix