Boulder City climate — normals and trends
Boulder City (United States) has a hot desert climate (BWh) under the Köppen-Geiger classification. Its mean annual temperature is 20.5 °C and it receives 151 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 (33.7 °C on average) and the coldest is January (8.1 °C). Rainfall peaks in February.
Boulder City averages 9 frost days, 151 hot days (≥ 30 °C) and 29 rainy days per year.
Boulder City has warmed by +3.0 °C between 1940 and 2025, or +0.35 °C per decade. This trend is statistically significant.
The number of frost days there went from about 18 to 0 per year over the period.
The hottest day of the period reached 47.6 °C (on 7 July 2024) and the coldest -9.8 °C (on 23 December 1990).
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
Boulder CityNevada
- coords
- 35.98°, -114.83°
- period
- 1940–2025 · 86 yrs
Mean daily temperature
20.5°C
Average daily high
26.3°C
Average daily low
14.8°C
Annual rainfall
151mm
Sunshine / day
11.3h
Mean relative humidity
34%
Average peak wind
14.1km/h
Seasonal range
25.6°C
Frost days (< 0 °C)
9 d/yr
Hot days (≥ 30 °C)
151 d/yr
Rainy days (≥ 1 mm)
29 d/yr
Annual snowfall
2.0 cm
Average feels-like high
23.7 °C
Average feels-like low
12.4 °C
Average peak gust
35.3 km/h
Tropical nights (≥ 20 °C)
123 d/yr
Solar radiation
20.8 MJ/m²
Has the climate changed?
One stripe per year, 1940 to 2025
+3.0 °C
since 1940
+0.4 °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
47.6 °C
7 July 2024
Coldest day
-9.8 °C
23 December 1990
Wettest day
47 mm
8 February 1993
Windiest day
41.2 km/h
30 March 2017
Strongest gust
98.3 km/h
30 November 1982
Hottest feels-like
47.2 °C
5 July 1985
Coldest feels-like
-16.2 °C
12 January 1963
Snowiest day
14.6 cm
17 December 2008
Sunniest day
14.3 h
20 June 1942
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 | 13.7 °C | +0.4 °C | 1 mm | -20 mm |
| Feb | 20.1 °C | +3.7 °C | 11 mm | -12 mm |
| Mar | 21.8 °C | +1.3 °C | 15 mm | -5 mm |
| Apr | 26.7 °C | +1.2 °C | 1 mm | -8 mm |
| May | 32.2 °C | +1.4 °C | 14 mm | +10 mm |
| Jun | 38.7 °C | +2.0 °C | 6 mm | +4 mm |
| Jul | 40.2 °C | +0.5 °C | 2 mm | -5 mm |
| Aug | 40.3 °C | +1.9 °C | 12 mm | -1 mm |
| Sep | 34.2 °C | -0.2 °C | 9 mm | -1 mm |
| Oct | 27.6 °C | +0.5 °C | 16 mm | +6 mm |
| Nov | 21.4 °C | +2.6 °C | 40 mm | +26 mm |
| Dec | 17.2 °C | +3.8 °C | 21 mm | +2 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 Boulder City?
Boulder City has a hot desert climate (Köppen BWh). Over 1940-2025, the average annual temperature is 20.5 °C and it receives 151 mm of precipitation per year.
What is the hottest day ever recorded in Boulder City?
The hottest day measured in Boulder City between 1940 and 2025 was 7 July 2024, reaching 47.6 °C.
What is the coldest day in Boulder City?
The coldest day measured in Boulder City between 1940 and 2025 was 23 December 1990, at -9.8 °C.
Does it snow in Boulder City?
Yes. Boulder City gets on average 2.0 cm of snow per year and has around 9 frost days.
Has the climate of Boulder City warmed?
Yes: Boulder City warmed by +3.0 °C between 1940 and 2025, a statistically significant trend.
What is the wettest day in Boulder City?
The wettest day measured in Boulder City between 1940 and 2025 was 8 February 1993, with 47 mm of rain in 24 hours.
What was the windiest day in Boulder City?
The windiest day measured in Boulder City between 1940 and 2025 was 30 March 2017, with winds reaching 41.2 km/h.
What is the warmest month in Boulder City?
The warmest month in Boulder City is July (33.7 °C on average); the coldest is January (8.1 °C).
How much does it rain in Boulder City?
Boulder City receives on average 151 mm of precipitation per year, spread over about 29 rainy days.
Is it sunny in Boulder City?
Boulder City 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 Boulder City?
The heaviest 24-hour snowfall measured in Boulder City between 1940 and 2025 was 17 December 2008, with 14.6 cm.
Are there tropical nights in Boulder City?
Yes: Boulder City has on average 123 tropical nights per year (temperature staying above 20 °C), over 1940-2025.
What was the most extreme apparent temperature in Boulder City?
In Boulder City, between 1940 and 2025, the highest apparent temperature reached 47.2 °C on 5 July 1985, and the lowest was -16.2 °C on 12 January 1963.
Compare Boulder City with another city
Pick a second city: its normals will be set against these, indicator by indicator.
Nearby cities
The climate around Boulder City