Grand Junction climate — normals and trends
Grand Junction (United States) has a hot-summer humid continental climate (Dfa) under the Köppen-Geiger classification. Its mean annual temperature is 8.1 °C and it receives 645 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 (22.5 °C on average) and the coldest is January (-5.8 °C). Rainfall peaks in August.
Grand Junction averages 159 frost days, 35 hot days (≥ 30 °C) and 110 rainy days per year.
Grand Junction has warmed by +3.2 °C between 1940 and 2025, or +0.37 °C per decade. This trend is statistically significant.
The number of frost days there went from about 176 to 142 per year over the period.
The hottest day of the period reached 38.0 °C (on 9 July 2021) and the coldest -33.6 °C (on 13 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
Grand JunctionColorado
- coords
- 39.06°, -108.55°
- period
- 1940–2025 · 86 yrs
Mean daily temperature
8.1°C
Average daily high
14.9°C
Average daily low
1.7°C
Annual rainfall
645mm
Sunshine / day
10.9h
Mean relative humidity
55%
Average peak wind
10.5km/h
Seasonal range
28.3°C
Frost days (< 0 °C)
159 d/yr
Hot days (≥ 30 °C)
35 d/yr
Rainy days (≥ 1 mm)
110 d/yr
Annual snowfall
135.0 cm
Average feels-like high
12.5 °C
Average feels-like low
-1.4 °C
Average peak gust
31.2 km/h
Tropical nights (≥ 20 °C)
0 d/yr
Solar radiation
19.3 MJ/m²
Has the climate changed?
One stripe per year, 1940 to 2025
+3.2 °C
since 1940
+0.4 °C per decade · r² = 0.58 · 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
38.0 °C
9 July 2021
Coldest day
-33.6 °C
13 January 1963
Wettest day
47 mm
21 August 1993
Windiest day
40.0 km/h
7 June 1950
Strongest gust
106.6 km/h
26 May 2012
Hottest feels-like
37.0 °C
21 July 2005
Coldest feels-like
-38.4 °C
13 January 1963
Snowiest day
19.5 cm
28 March 1949
Sunniest day
14.7 h
28 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 | 2.7 °C | +2.3 °C | 6 mm | -34 mm |
| Feb | 9.0 °C | +5.8 °C | 34 mm | -9 mm |
| Mar | 12.6 °C | +4.8 °C | 36 mm | -23 mm |
| Apr | 17.7 °C | +3.9 °C | 24 mm | -30 mm |
| May | 23.3 °C | +3.1 °C | 27 mm | -25 mm |
| Jun | 29.8 °C | +2.8 °C | 46 mm | +12 mm |
| Jul | 32.2 °C | +2.3 °C | 25 mm | -40 mm |
| Aug | 30.9 °C | +3.0 °C | 33 mm | -59 mm |
| Sep | 24.3 °C | +0.8 °C | 64 mm | -2 mm |
| Oct | 17.4 °C | +1.1 °C | 105 mm | +49 mm |
| Nov | 12.7 °C | +5.1 °C | 31 mm | -13 mm |
| Dec | 7.9 °C | +6.5 °C | 18 mm | -23 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 Grand Junction?
Grand Junction has a hot-summer humid continental climate (Köppen Dfa). Over 1940-2025, the average annual temperature is 8.1 °C and it receives 645 mm of precipitation per year.
What is the hottest day ever recorded in Grand Junction?
The hottest day measured in Grand Junction between 1940 and 2025 was 9 July 2021, reaching 38.0 °C.
What is the coldest day in Grand Junction?
The coldest day measured in Grand Junction between 1940 and 2025 was 13 January 1963, at -33.6 °C.
Does it snow in Grand Junction?
Yes. Grand Junction gets on average 135.0 cm of snow per year and has around 159 frost days.
Has the climate of Grand Junction warmed?
Yes: Grand Junction warmed by +3.2 °C between 1940 and 2025, a statistically significant trend.
What is the wettest day in Grand Junction?
The wettest day measured in Grand Junction between 1940 and 2025 was 21 August 1993, with 47 mm of rain in 24 hours.
What was the windiest day in Grand Junction?
The windiest day measured in Grand Junction between 1940 and 2025 was 7 June 1950, with winds reaching 40.0 km/h.
What is the warmest month in Grand Junction?
The warmest month in Grand Junction is July (22.5 °C on average); the coldest is January (-5.8 °C).
How much does it rain in Grand Junction?
Grand Junction receives on average 645 mm of precipitation per year, spread over about 110 rainy days.
Is it sunny in Grand Junction?
Grand Junction gets on average 10.9 hours of sunshine per day, roughly 3,979 hours per year over 1940-2025.
What is the biggest single-day snowfall in Grand Junction?
The heaviest 24-hour snowfall measured in Grand Junction between 1940 and 2025 was 28 March 1949, with 19.5 cm.
Are there tropical nights in Grand Junction?
Almost never: tropical nights (temperature staying above 20 °C) are virtually non-existent in Grand Junction.
What was the most extreme apparent temperature in Grand Junction?
In Grand Junction, between 1940 and 2025, the highest apparent temperature reached 37.0 °C on 21 July 2005, and the lowest was -38.4 °C on 13 January 1963.
Compare Grand Junction with another city
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Nearby cities
The climate around Grand Junction