Twentynine Palms climate — normals and trends
Twentynine Palms (United States) has a hot desert climate (BWh) under the Köppen-Geiger classification. Its mean annual temperature is 19.8 °C and it receives 101 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 (31.5 °C on average) and the coldest is January (9.4 °C). Rainfall peaks in February.
Twentynine Palms averages 7 frost days, 143 hot days (≥ 30 °C) and 21 rainy days per year.
Twentynine Palms has warmed by +2.9 °C between 1940 and 2025, or +0.34 °C per decade. This trend is statistically significant.
The number of frost days there went from about 14 to 0 per year over the period.
The hottest day of the period reached 46.2 °C (on 10 July 2021) and the coldest -9.3 °C (on 27 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
Twentynine PalmsCalifornia
- coords
- 34.14°, -116.05°
- period
- 1940–2025 · 86 yrs
Mean daily temperature
19.8°C
Average daily high
26.1°C
Average daily low
13.5°C
Annual rainfall
101mm
Sunshine / day
11.5h
Mean relative humidity
31%
Average peak wind
13.9km/h
Seasonal range
22.1°C
Frost days (< 0 °C)
7 d/yr
Hot days (≥ 30 °C)
143 d/yr
Rainy days (≥ 1 mm)
21 d/yr
Annual snowfall
2.1 cm
Average feels-like high
23.5 °C
Average feels-like low
10.6 °C
Average peak gust
31.5 km/h
Tropical nights (≥ 20 °C)
96 d/yr
Solar radiation
21.7 MJ/m²
Has the climate changed?
One stripe per year, 1940 to 2025
+2.9 °C
since 1940
+0.3 °C per decade · r² = 0.74 · 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
46.2 °C
10 July 2021
Coldest day
-9.3 °C
27 January 1949
Wettest day
65 mm
20 July 1979
Windiest day
39.9 km/h
13 December 1984
Strongest gust
87.8 km/h
1 April 1982
Hottest feels-like
46.2 °C
10 July 2021
Coldest feels-like
-14.3 °C
13 January 1963
Snowiest day
15.8 cm
17 December 2008
Sunniest day
14.0 h
17 June 1940
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 | 15.2 °C | +0.1 °C | 6 mm | -7 mm |
| Feb | 21.3 °C | +3.8 °C | 9 mm | -5 mm |
| Mar | 22.0 °C | +1.2 °C | 9 mm | -1 mm |
| Apr | 26.2 °C | +1.2 °C | 0 mm | -5 mm |
| May | 31.1 °C | +1.3 °C | 5 mm | +4 mm |
| Jun | 37.3 °C | +2.2 °C | 6 mm | +5 mm |
| Jul | 38.6 °C | +0.7 °C | 3 mm | -5 mm |
| Aug | 39.1 °C | +2.3 °C | 8 mm | -5 mm |
| Sep | 32.8 °C | -0.6 °C | 18 mm | +11 mm |
| Oct | 27.7 °C | +0.9 °C | 8 mm | +1 mm |
| Nov | 21.8 °C | +2.2 °C | 40 mm | +32 mm |
| Dec | 19.5 °C | +4.4 °C | 18 mm | +4 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 Twentynine Palms?
Twentynine Palms has a hot desert climate (Köppen BWh). Over 1940-2025, the average annual temperature is 19.8 °C and it receives 101 mm of precipitation per year.
What is the hottest day ever recorded in Twentynine Palms?
The hottest day measured in Twentynine Palms between 1940 and 2025 was 10 July 2021, reaching 46.2 °C.
What is the coldest day in Twentynine Palms?
The coldest day measured in Twentynine Palms between 1940 and 2025 was 27 January 1949, at -9.3 °C.
Does it snow in Twentynine Palms?
Yes. Twentynine Palms gets on average 2.1 cm of snow per year and has around 7 frost days.
Has the climate of Twentynine Palms warmed?
Yes: Twentynine Palms warmed by +2.9 °C between 1940 and 2025, a statistically significant trend.
What is the wettest day in Twentynine Palms?
The wettest day measured in Twentynine Palms between 1940 and 2025 was 20 July 1979, with 65 mm of rain in 24 hours.
What was the windiest day in Twentynine Palms?
The windiest day measured in Twentynine Palms between 1940 and 2025 was 13 December 1984, with winds reaching 39.9 km/h.
What is the warmest month in Twentynine Palms?
The warmest month in Twentynine Palms is July (31.5 °C on average); the coldest is January (9.4 °C).
How much does it rain in Twentynine Palms?
Twentynine Palms receives on average 101 mm of precipitation per year, spread over about 21 rainy days.
Is it sunny in Twentynine Palms?
Twentynine Palms gets on average 11.5 hours of sunshine per day, roughly 4,198 hours per year over 1940-2025.
What is the biggest single-day snowfall in Twentynine Palms?
The heaviest 24-hour snowfall measured in Twentynine Palms between 1940 and 2025 was 17 December 2008, with 15.8 cm.
Are there tropical nights in Twentynine Palms?
Yes: Twentynine Palms has on average 96 tropical nights per year (temperature staying above 20 °C), over 1940-2025.
What was the most extreme apparent temperature in Twentynine Palms?
In Twentynine Palms, between 1940 and 2025, the highest apparent temperature reached 46.2 °C on 10 July 2021, and the lowest was -14.3 °C on 13 January 1963.
Compare Twentynine Palms with another city
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Nearby cities
The climate around Twentynine Palms