Greeley climate — normals and trends
Greeley (United States) has a hot-summer humid continental climate (Dfa) under the Köppen-Geiger classification. Its mean annual temperature is 9.6 °C and it receives 388 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 (23.4 °C on average) and the coldest is January (-3.2 °C). Rainfall peaks in May.
Greeley averages 148 frost days, 56 hot days (≥ 30 °C) and 74 rainy days per year.
Greeley has warmed by +2.6 °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 162 to 134 per year over the period.
The hottest day of the period reached 40.0 °C (on 11 July 1954) and the coldest -36.3 °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
GreeleyColorado
- coords
- 40.42°, -104.71°
- period
- 1940–2025 · 86 yrs
Mean daily temperature
9.6°C
Average daily high
17.0°C
Average daily low
3.0°C
Annual rainfall
388mm
Sunshine / day
10.4h
Mean relative humidity
54%
Average peak wind
17.1km/h
Seasonal range
26.6°C
Frost days (< 0 °C)
148 d/yr
Hot days (≥ 30 °C)
56 d/yr
Rainy days (≥ 1 mm)
74 d/yr
Annual snowfall
69.8 cm
Average feels-like high
14.1 °C
Average feels-like low
-0.1 °C
Average peak gust
32.5 km/h
Tropical nights (≥ 20 °C)
1 d/yr
Solar radiation
17.9 MJ/m²
Has the climate changed?
One stripe per year, 1940 to 2025
+2.6 °C
since 1940
+0.3 °C per decade · r² = 0.47 · 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
40.0 °C
11 July 1954
Coldest day
-36.3 °C
22 December 1990
Wettest day
75 mm
8 June 1974
Windiest day
56.8 km/h
11 March 1977
Strongest gust
104.0 km/h
2 April 1982
Hottest feels-like
39.2 °C
19 July 2017
Coldest feels-like
-40.8 °C
22 December 1990
Snowiest day
30.4 cm
18 March 2003
Sunniest day
14.2 h
24 June 2023
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 | 3.0 °C | -0.7 °C | 16 mm | +2 mm |
| Feb | 6.7 °C | +0.6 °C | 13 mm | -2 mm |
| Mar | 16.4 °C | +5.5 °C | 33 mm | +1 mm |
| Apr | 17.7 °C | +1.7 °C | 33 mm | -18 mm |
| May | 22.2 °C | +1.0 °C | 75 mm | +3 mm |
| Jun | 28.6 °C | +1.3 °C | 52 mm | +7 mm |
| Jul | 32.4 °C | +1.3 °C | 51 mm | +13 mm |
| Aug | 30.8 °C | +0.8 °C | 46 mm | +13 mm |
| Sep | 26.7 °C | +1.4 °C | 61 mm | +32 mm |
| Oct | 19.3 °C | +1.2 °C | 14 mm | -14 mm |
| Nov | 14.4 °C | +4.7 °C | 8 mm | -11 mm |
| Dec | 12.6 °C | +7.8 °C | 5 mm | -8 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 Greeley?
Greeley has a hot-summer humid continental climate (Köppen Dfa). Over 1940-2025, the average annual temperature is 9.6 °C and it receives 388 mm of precipitation per year.
What is the hottest day ever recorded in Greeley?
The hottest day measured in Greeley between 1940 and 2025 was 11 July 1954, reaching 40.0 °C.
What is the coldest day in Greeley?
The coldest day measured in Greeley between 1940 and 2025 was 22 December 1990, at -36.3 °C.
Does it snow in Greeley?
Yes. Greeley gets on average 69.8 cm of snow per year and has around 148 frost days.
Has the climate of Greeley warmed?
Yes: Greeley warmed by +2.6 °C between 1940 and 2025, a statistically significant trend.
What is the wettest day in Greeley?
The wettest day measured in Greeley between 1940 and 2025 was 8 June 1974, with 75 mm of rain in 24 hours.
What was the windiest day in Greeley?
The windiest day measured in Greeley between 1940 and 2025 was 11 March 1977, with winds reaching 56.8 km/h.
What is the warmest month in Greeley?
The warmest month in Greeley is July (23.4 °C on average); the coldest is January (-3.2 °C).
How much does it rain in Greeley?
Greeley receives on average 388 mm of precipitation per year, spread over about 74 rainy days.
Is it sunny in Greeley?
Greeley gets on average 10.4 hours of sunshine per day, roughly 3,796 hours per year over 1940-2025.
What is the biggest single-day snowfall in Greeley?
The heaviest 24-hour snowfall measured in Greeley between 1940 and 2025 was 18 March 2003, with 30.4 cm.
Are there tropical nights in Greeley?
Yes: Greeley has on average 1 tropical nights per year (temperature staying above 20 °C), over 1940-2025.
What was the most extreme apparent temperature in Greeley?
In Greeley, between 1940 and 2025, the highest apparent temperature reached 39.2 °C on 19 July 2017, and the lowest was -40.8 °C on 22 December 1990.
Compare Greeley with another city
Pick a second city: its normals will be set against these, indicator by indicator.
Nearby cities
The climate around Greeley