Fort Collins climate — normals and trends
Fort Collins (United States) has a hot-summer humid continental climate (Dfa) under the Köppen-Geiger classification. Its mean annual temperature is 8.9 °C and it receives 521 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 (22.0 °C on average) and the coldest is January (-3.1 °C). Rainfall peaks in May.
Fort Collins averages 150 frost days, 39 hot days (≥ 30 °C) and 91 rainy days per year.
Fort Collins has warmed by +2.5 °C between 1940 and 2025, or +0.30 °C per decade. This trend is statistically significant.
The number of frost days there went from about 164 to 136 per year over the period.
The hottest day of the period reached 38.8 °C (on 11 July 1954) and the coldest -33.9 °C (on 22 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
Fort CollinsColorado
- coords
- 40.59°, -105.08°
- period
- 1940–2025 · 86 yrs
Mean daily temperature
8.9°C
Average daily high
16.2°C
Average daily low
2.4°C
Annual rainfall
521mm
Sunshine / day
10.6h
Mean relative humidity
58%
Average peak wind
14.1km/h
Seasonal range
25.1°C
Frost days (< 0 °C)
150 d/yr
Hot days (≥ 30 °C)
39 d/yr
Rainy days (≥ 1 mm)
91 d/yr
Annual snowfall
100.8 cm
Average feels-like high
13.6 °C
Average feels-like low
-0.6 °C
Average peak gust
31.9 km/h
Tropical nights (≥ 20 °C)
0 d/yr
Solar radiation
18.0 MJ/m²
Has the climate changed?
One stripe per year, 1940 to 2025
+2.5 °C
since 1940
+0.3 °C per decade · r² = 0.46 · 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
38.8 °C
11 July 1954
Coldest day
-33.9 °C
22 December 1990
Wettest day
78 mm
8 June 1974
Windiest day
52.0 km/h
2 April 1982
Strongest gust
110.2 km/h
2 April 1982
Hottest feels-like
38.4 °C
18 July 2022
Coldest feels-like
-38.9 °C
22 December 1990
Snowiest day
31.9 cm
18 March 2003
Sunniest day
14.3 h
1 July 2020
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 | 2.5 °C | -1.2 °C | 26 mm | +7 mm |
| Feb | 5.6 °C | -0.1 °C | 19 mm | -2 mm |
| Mar | 15.6 °C | +5.7 °C | 44 mm | -0 mm |
| Apr | 16.7 °C | +1.8 °C | 49 mm | -20 mm |
| May | 21.0 °C | +1.1 °C | 107 mm | +12 mm |
| Jun | 27.1 °C | +1.2 °C | 54 mm | -9 mm |
| Jul | 31.0 °C | +1.4 °C | 44 mm | +0 mm |
| Aug | 29.7 °C | +1.1 °C | 56 mm | +16 mm |
| Sep | 25.4 °C | +1.2 °C | 62 mm | +20 mm |
| Oct | 18.5 °C | +1.1 °C | 24 mm | -13 mm |
| Nov | 14.1 °C | +4.7 °C | 6 mm | -22 mm |
| Dec | 12.4 °C | +7.6 °C | 13 mm | -6 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 Fort Collins?
Fort Collins has a hot-summer humid continental climate (Köppen Dfa). Over 1940-2025, the average annual temperature is 8.9 °C and it receives 521 mm of precipitation per year.
What is the hottest day ever recorded in Fort Collins?
The hottest day measured in Fort Collins between 1940 and 2025 was 11 July 1954, reaching 38.8 °C.
What is the coldest day in Fort Collins?
The coldest day measured in Fort Collins between 1940 and 2025 was 22 December 1990, at -33.9 °C.
Does it snow in Fort Collins?
Yes. Fort Collins gets on average 100.8 cm of snow per year and has around 150 frost days.
Has the climate of Fort Collins warmed?
Yes: Fort Collins warmed by +2.5 °C between 1940 and 2025, a statistically significant trend.
What is the wettest day in Fort Collins?
The wettest day measured in Fort Collins between 1940 and 2025 was 8 June 1974, with 78 mm of rain in 24 hours.
What was the windiest day in Fort Collins?
The windiest day measured in Fort Collins between 1940 and 2025 was 2 April 1982, with winds reaching 52.0 km/h.
What is the warmest month in Fort Collins?
The warmest month in Fort Collins is July (22.0 °C on average); the coldest is January (-3.1 °C).
How much does it rain in Fort Collins?
Fort Collins receives on average 521 mm of precipitation per year, spread over about 91 rainy days.
Is it sunny in Fort Collins?
Fort Collins gets on average 10.6 hours of sunshine per day, roughly 3,869 hours per year over 1940-2025.
What is the biggest single-day snowfall in Fort Collins?
The heaviest 24-hour snowfall measured in Fort Collins between 1940 and 2025 was 18 March 2003, with 31.9 cm.
Are there tropical nights in Fort Collins?
Almost never: tropical nights (temperature staying above 20 °C) are virtually non-existent in Fort Collins.
What was the most extreme apparent temperature in Fort Collins?
In Fort Collins, between 1940 and 2025, the highest apparent temperature reached 38.4 °C on 18 July 2022, and the lowest was -38.9 °C on 22 December 1990.
Compare Fort Collins with another city
Pick a second city: its normals will be set against these, indicator by indicator.
Nearby cities
The climate around Fort Collins