Grand Forks climate — normals and trends
Grand Forks (United States) has a warm-summer humid continental climate (Dfb) under the Köppen-Geiger classification. Its mean annual temperature is 4.6 °C and it receives 627 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 (21.1 °C on average) and the coldest is January (-14.6 °C). Rainfall peaks in June.
Grand Forks averages 171 frost days, 17 hot days (≥ 30 °C) and 94 rainy days per year.
Grand Forks has warmed by +1.3 °C between 1940 and 2025, or +0.16 °C per decade. This trend is statistically significant.
The hottest day of the period reached 40.2 °C (on 4 June 2021) and the coldest -41.6 °C (on 1 February 1996).
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 ForksNorth Dakota
- coords
- 47.93°, -97.03°
- period
- 1940–2025 · 86 yrs
Mean daily temperature
4.6°C
Average daily high
9.8°C
Average daily low
-0.5°C
Annual rainfall
627mm
Sunshine / day
8.9h
Mean relative humidity
70%
Average peak wind
19.6km/h
Seasonal range
35.7°C
Frost days (< 0 °C)
171 d/yr
Hot days (≥ 30 °C)
17 d/yr
Rainy days (≥ 1 mm)
94 d/yr
Annual snowfall
83.2 cm
Average feels-like high
6.8 °C
Average feels-like low
-4.2 °C
Average peak gust
38.0 km/h
Tropical nights (≥ 20 °C)
6 d/yr
Solar radiation
13.9 MJ/m²
Has the climate changed?
One stripe per year, 1940 to 2025
+1.3 °C
since 1940
+0.2 °C per decade · r² = 0.11 · 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
40.2 °C
4 June 2021
Coldest day
-41.6 °C
1 February 1996
Wettest day
96 mm
15 June 1953
Windiest day
57.0 km/h
7 June 1954
Strongest gust
105.5 km/h
7 June 1954
Hottest feels-like
41.2 °C
3 August 1947
Coldest feels-like
-47.0 °C
1 February 1996
Snowiest day
24.6 cm
24 October 2001
Sunniest day
15.1 h
20 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 | -9.0 °C | +0.9 °C | 16 mm | -4 mm |
| Feb | -8.9 °C | -2.1 °C | 6 mm | -11 mm |
| Mar | 5.1 °C | +4.3 °C | 21 mm | -10 mm |
| Apr | 11.7 °C | +0.8 °C | 70 mm | +17 mm |
| May | 22.6 °C | +3.7 °C | 59 mm | -20 mm |
| Jun | 25.0 °C | +1.1 °C | 87 mm | -14 mm |
| Jul | 26.3 °C | -0.4 °C | 159 mm | +77 mm |
| Aug | 25.5 °C | -0.3 °C | 75 mm | -2 mm |
| Sep | 22.7 °C | +2.7 °C | 49 mm | -16 mm |
| Oct | 15.0 °C | +2.5 °C | 108 mm | +58 mm |
| Nov | 4.7 °C | +3.2 °C | 17 mm | -12 mm |
| Dec | -6.9 °C | -0.2 °C | 46 mm | +22 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 Forks?
Grand Forks has a warm-summer humid continental climate (Köppen Dfb). Over 1940-2025, the average annual temperature is 4.6 °C and it receives 627 mm of precipitation per year.
What is the hottest day ever recorded in Grand Forks?
The hottest day measured in Grand Forks between 1940 and 2025 was 4 June 2021, reaching 40.2 °C.
What is the coldest day in Grand Forks?
The coldest day measured in Grand Forks between 1940 and 2025 was 1 February 1996, at -41.6 °C.
Does it snow in Grand Forks?
Yes. Grand Forks gets on average 83.2 cm of snow per year and has around 171 frost days.
Has the climate of Grand Forks warmed?
Yes: Grand Forks warmed by +1.3 °C between 1940 and 2025, a statistically significant trend.
What is the wettest day in Grand Forks?
The wettest day measured in Grand Forks between 1940 and 2025 was 15 June 1953, with 96 mm of rain in 24 hours.
What was the windiest day in Grand Forks?
The windiest day measured in Grand Forks between 1940 and 2025 was 7 June 1954, with winds reaching 57.0 km/h.
What is the warmest month in Grand Forks?
The warmest month in Grand Forks is July (21.1 °C on average); the coldest is January (-14.6 °C).
How much does it rain in Grand Forks?
Grand Forks receives on average 627 mm of precipitation per year, spread over about 94 rainy days.
Is it sunny in Grand Forks?
Grand Forks gets on average 8.9 hours of sunshine per day, roughly 3,249 hours per year over 1940-2025.
What is the biggest single-day snowfall in Grand Forks?
The heaviest 24-hour snowfall measured in Grand Forks between 1940 and 2025 was 24 October 2001, with 24.6 cm.
Are there tropical nights in Grand Forks?
Yes: Grand Forks has on average 6 tropical nights per year (temperature staying above 20 °C), over 1940-2025.
What was the most extreme apparent temperature in Grand Forks?
In Grand Forks, between 1940 and 2025, the highest apparent temperature reached 41.2 °C on 3 August 1947, and the lowest was -47.0 °C on 1 February 1996.
Compare Grand Forks with another city
Pick a second city: its normals will be set against these, indicator by indicator.
Nearby cities
The climate around Grand Forks