St. George climate — normals and trends
St. George (United States) has a cold semi-arid climate (BSk) under the Köppen-Geiger classification. Its mean annual temperature is 15.4 °C and it receives 278 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 (29.2 °C on average) and the coldest is January (2.4 °C). Rainfall peaks in March.
St. George averages 78 frost days, 109 hot days (≥ 30 °C) and 46 rainy days per year.
St. George has warmed by +3.4 °C between 1940 and 2025, or +0.40 °C per decade. This trend is statistically significant.
The number of frost days there went from about 103 to 53 per year over the period.
The hottest day of the period reached 43.3 °C (on 16 July 2023) and the coldest -24.8 °C (on 4 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
St. GeorgeUtah
- coords
- 37.10°, -113.58°
- period
- 1940–2025 · 86 yrs
Mean daily temperature
15.4°C
Average daily high
21.9°C
Average daily low
8.3°C
Annual rainfall
278mm
Sunshine / day
11.2h
Mean relative humidity
39%
Average peak wind
12.5km/h
Seasonal range
26.8°C
Frost days (< 0 °C)
78 d/yr
Hot days (≥ 30 °C)
109 d/yr
Rainy days (≥ 1 mm)
46 d/yr
Annual snowfall
24.3 cm
Average feels-like high
19.4 °C
Average feels-like low
5.2 °C
Average peak gust
33.1 km/h
Tropical nights (≥ 20 °C)
48 d/yr
Solar radiation
20.3 MJ/m²
Has the climate changed?
One stripe per year, 1940 to 2025
+3.4 °C
since 1940
+0.4 °C per decade · r² = 0.70 · 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
43.3 °C
16 July 2023
Coldest day
-24.8 °C
4 January 1949
Wettest day
66 mm
20 November 2019
Windiest day
41.7 km/h
15 April 2002
Strongest gust
109.4 km/h
15 April 2002
Hottest feels-like
43.2 °C
16 July 1998
Coldest feels-like
-29.7 °C
4 January 1949
Snowiest day
13.2 cm
13 January 1997
Sunniest day
14.6 h
18 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 | 10.4 °C | +1.6 °C | 1 mm | -34 mm |
| Feb | 16.1 °C | +4.4 °C | 22 mm | -15 mm |
| Mar | 17.6 °C | +1.8 °C | 37 mm | -1 mm |
| Apr | 22.7 °C | +1.7 °C | 5 mm | -17 mm |
| May | 28.0 °C | +1.5 °C | 20 mm | +10 mm |
| Jun | 34.5 °C | +1.8 °C | 8 mm | +4 mm |
| Jul | 36.0 °C | +0.5 °C | 5 mm | -6 mm |
| Aug | 35.4 °C | +1.4 °C | 34 mm | +14 mm |
| Sep | 30.3 °C | +0.3 °C | 4 mm | -17 mm |
| Oct | 23.2 °C | +0.3 °C | 49 mm | +24 mm |
| Nov | 18.0 °C | +3.1 °C | 37 mm | +12 mm |
| Dec | 14.6 °C | +5.1 °C | 24 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 St. George?
St. George has a cold semi-arid climate (Köppen BSk). Over 1940-2025, the average annual temperature is 15.4 °C and it receives 278 mm of precipitation per year.
What is the hottest day ever recorded in St. George?
The hottest day measured in St. George between 1940 and 2025 was 16 July 2023, reaching 43.3 °C.
What is the coldest day in St. George?
The coldest day measured in St. George between 1940 and 2025 was 4 January 1949, at -24.8 °C.
Does it snow in St. George?
Yes. St. George gets on average 24.3 cm of snow per year and has around 78 frost days.
Has the climate of St. George warmed?
Yes: St. George warmed by +3.4 °C between 1940 and 2025, a statistically significant trend.
What is the wettest day in St. George?
The wettest day measured in St. George between 1940 and 2025 was 20 November 2019, with 66 mm of rain in 24 hours.
What was the windiest day in St. George?
The windiest day measured in St. George between 1940 and 2025 was 15 April 2002, with winds reaching 41.7 km/h.
What is the warmest month in St. George?
The warmest month in St. George is July (29.2 °C on average); the coldest is January (2.4 °C).
How much does it rain in St. George?
St. George receives on average 278 mm of precipitation per year, spread over about 46 rainy days.
Is it sunny in St. George?
St. George 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 St. George?
The heaviest 24-hour snowfall measured in St. George between 1940 and 2025 was 13 January 1997, with 13.2 cm.
Are there tropical nights in St. George?
Yes: St. George has on average 48 tropical nights per year (temperature staying above 20 °C), over 1940-2025.
What was the most extreme apparent temperature in St. George?
In St. George, between 1940 and 2025, the highest apparent temperature reached 43.2 °C on 16 July 1998, and the lowest was -29.7 °C on 4 January 1949.
Compare St. George with another city
Pick a second city: its normals will be set against these, indicator by indicator.
Nearby cities
The climate around St. George