Douglas climate — normals and trends
Douglas (United States) has a cold semi-arid climate (BSk) under the Köppen-Geiger classification. Its mean annual temperature is 17.7 °C and it receives 279 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 June (27.0 °C on average) and the coldest is January (7.8 °C). Rainfall peaks in July.
Douglas averages 29 frost days, 123 hot days (≥ 30 °C) and 55 rainy days per year.
Douglas 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 41 to 17 per year over the period.
The hottest day of the period reached 42.5 °C (on 28 June 1994) and the coldest -16.7 °C (on 9 December 1978).
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
DouglasArizona
- coords
- 31.34°, -109.55°
- period
- 1940–2025 · 86 yrs
Mean daily temperature
17.7°C
Average daily high
25.2°C
Average daily low
10.7°C
Annual rainfall
279mm
Sunshine / day
11.2h
Mean relative humidity
40%
Average peak wind
16.9km/h
Seasonal range
19.2°C
Frost days (< 0 °C)
29 d/yr
Hot days (≥ 30 °C)
123 d/yr
Rainy days (≥ 1 mm)
55 d/yr
Annual snowfall
3.3 cm
Average feels-like high
22.7 °C
Average feels-like low
8.3 °C
Average peak gust
36.2 km/h
Tropical nights (≥ 20 °C)
46 d/yr
Solar radiation
21.5 MJ/m²
Has the climate changed?
One stripe per year, 1940 to 2025
+2.7 °C
since 1940
+0.3 °C per decade · r² = 0.62 · 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
42.5 °C
28 June 1994
Coldest day
-16.7 °C
9 December 1978
Wettest day
65 mm
5 December 1994
Windiest day
54.5 km/h
14 March 1944
Strongest gust
106.6 km/h
1 December 1982
Hottest feels-like
43.1 °C
19 July 2023
Coldest feels-like
-22.1 °C
9 December 1978
Snowiest day
7.1 cm
17 December 1967
Sunniest day
13.7 h
16 June 2025
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 | 16.0 °C | +0.4 °C | 9 mm | -17 mm |
| Feb | 23.8 °C | +5.9 °C | 0 mm | -20 mm |
| Mar | 23.2 °C | +2.3 °C | 7 mm | -10 mm |
| Apr | 27.0 °C | +1.7 °C | 2 mm | -5 mm |
| May | 30.9 °C | +1.0 °C | 1 mm | -4 mm |
| Jun | 36.8 °C | +2.2 °C | 23 mm | +15 mm |
| Jul | 34.7 °C | +1.2 °C | 59 mm | +6 mm |
| Aug | 35.9 °C | +3.9 °C | 18 mm | -33 mm |
| Sep | 31.5 °C | +0.9 °C | 61 mm | +34 mm |
| Oct | 28.3 °C | +2.2 °C | 77 mm | +57 mm |
| Nov | 23.3 °C | +3.1 °C | 48 mm | +32 mm |
| Dec | 21.3 °C | +5.3 °C | 4 mm | -24 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 Douglas?
Douglas has a cold semi-arid climate (Köppen BSk). Over 1940-2025, the average annual temperature is 17.7 °C and it receives 279 mm of precipitation per year.
What is the hottest day ever recorded in Douglas?
The hottest day measured in Douglas between 1940 and 2025 was 28 June 1994, reaching 42.5 °C.
What is the coldest day in Douglas?
The coldest day measured in Douglas between 1940 and 2025 was 9 December 1978, at -16.7 °C.
Does it snow in Douglas?
Yes. Douglas gets on average 3.3 cm of snow per year and has around 29 frost days.
Has the climate of Douglas warmed?
Yes: Douglas warmed by +2.7 °C between 1940 and 2025, a statistically significant trend.
What is the wettest day in Douglas?
The wettest day measured in Douglas between 1940 and 2025 was 5 December 1994, with 65 mm of rain in 24 hours.
What was the windiest day in Douglas?
The windiest day measured in Douglas between 1940 and 2025 was 14 March 1944, with winds reaching 54.5 km/h.
What is the warmest month in Douglas?
The warmest month in Douglas is June (27.0 °C on average); the coldest is January (7.8 °C).
How much does it rain in Douglas?
Douglas receives on average 279 mm of precipitation per year, spread over about 55 rainy days.
Is it sunny in Douglas?
Douglas 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 Douglas?
The heaviest 24-hour snowfall measured in Douglas between 1940 and 2025 was 17 December 1967, with 7.1 cm.
Are there tropical nights in Douglas?
Yes: Douglas has on average 46 tropical nights per year (temperature staying above 20 °C), over 1940-2025.
What was the most extreme apparent temperature in Douglas?
In Douglas, between 1940 and 2025, the highest apparent temperature reached 43.1 °C on 19 July 2023, and the lowest was -22.1 °C on 9 December 1978.
Compare Douglas with another city
Pick a second city: its normals will be set against these, indicator by indicator.
Nearby cities
The climate around Douglas