Grand Island climate — normals and trends
Grand Island (United States) has a hot-summer humid continental climate (Dfa) under the Köppen-Geiger classification. Its mean annual temperature is 10.2 °C and it receives 730 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 (24.5 °C on average) and the coldest is January (-5.0 °C). Rainfall peaks in May.
Grand Island averages 133 frost days, 50 hot days (≥ 30 °C) and 89 rainy days per year.
Grand Island has warmed by +1.7 °C between 1940 and 2025, or +0.20 °C per decade. This trend is statistically significant.
The number of frost days there went from about 138 to 128 per year over the period.
The hottest day of the period reached 44.2 °C (on 11 July 1954) and the coldest -33.7 °C (on 22 December 1989).
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 IslandNebraska
- coords
- 40.93°, -98.34°
- period
- 1940–2025 · 86 yrs
Mean daily temperature
10.2°C
Average daily high
16.2°C
Average daily low
4.8°C
Annual rainfall
730mm
Sunshine / day
9.6h
Mean relative humidity
67%
Average peak wind
22.8km/h
Seasonal range
29.5°C
Frost days (< 0 °C)
133 d/yr
Hot days (≥ 30 °C)
50 d/yr
Rainy days (≥ 1 mm)
89 d/yr
Annual snowfall
66.9 cm
Average feels-like high
13.7 °C
Average feels-like low
1.5 °C
Average peak gust
41.3 km/h
Tropical nights (≥ 20 °C)
28 d/yr
Solar radiation
16.3 MJ/m²
Has the climate changed?
One stripe per year, 1940 to 2025
+1.7 °C
since 1940
+0.2 °C per decade · r² = 0.29 · 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
44.2 °C
11 July 1954
Coldest day
-33.7 °C
22 December 1989
Wettest day
96 mm
8 June 1975
Windiest day
66.3 km/h
22 December 1968
Strongest gust
107.6 km/h
10 October 1949
Hottest feels-like
44.9 °C
12 July 1957
Coldest feels-like
-39.8 °C
22 December 1989
Snowiest day
27.7 cm
27 November 1983
Sunniest day
14.9 h
15 June 2025
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 | 1.5 °C | +0.9 °C | 10 mm | -11 mm |
| Feb | 1.2 °C | -2.1 °C | 20 mm | -7 mm |
| Mar | 15.4 °C | +6.3 °C | 39 mm | -17 mm |
| Apr | 18.4 °C | +2.1 °C | 57 mm | -23 mm |
| May | 23.0 °C | +1.1 °C | 64 mm | -49 mm |
| Jun | 29.0 °C | +1.4 °C | 119 mm | +13 mm |
| Jul | 30.3 °C | 0.0 °C | 42 mm | -31 mm |
| Aug | 28.2 °C | -1.1 °C | 98 mm | +25 mm |
| Sep | 26.3 °C | +1.3 °C | 60 mm | -7 mm |
| Oct | 20.5 °C | +2.1 °C | 26 mm | -28 mm |
| Nov | 12.0 °C | +2.6 °C | 20 mm | -14 mm |
| Dec | 7.4 °C | +4.7 °C | 5 mm | -21 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 Island?
Grand Island has a hot-summer humid continental climate (Köppen Dfa). Over 1940-2025, the average annual temperature is 10.2 °C and it receives 730 mm of precipitation per year.
What is the hottest day ever recorded in Grand Island?
The hottest day measured in Grand Island between 1940 and 2025 was 11 July 1954, reaching 44.2 °C.
What is the coldest day in Grand Island?
The coldest day measured in Grand Island between 1940 and 2025 was 22 December 1989, at -33.7 °C.
Does it snow in Grand Island?
Yes. Grand Island gets on average 66.9 cm of snow per year and has around 133 frost days.
Has the climate of Grand Island warmed?
Yes: Grand Island warmed by +1.7 °C between 1940 and 2025, a statistically significant trend.
What is the wettest day in Grand Island?
The wettest day measured in Grand Island between 1940 and 2025 was 8 June 1975, with 96 mm of rain in 24 hours.
What was the windiest day in Grand Island?
The windiest day measured in Grand Island between 1940 and 2025 was 22 December 1968, with winds reaching 66.3 km/h.
What is the warmest month in Grand Island?
The warmest month in Grand Island is July (24.5 °C on average); the coldest is January (-5.0 °C).
How much does it rain in Grand Island?
Grand Island receives on average 730 mm of precipitation per year, spread over about 89 rainy days.
Is it sunny in Grand Island?
Grand Island gets on average 9.6 hours of sunshine per day, roughly 3,504 hours per year over 1940-2025.
What is the biggest single-day snowfall in Grand Island?
The heaviest 24-hour snowfall measured in Grand Island between 1940 and 2025 was 27 November 1983, with 27.7 cm.
Are there tropical nights in Grand Island?
Yes: Grand Island has on average 28 tropical nights per year (temperature staying above 20 °C), over 1940-2025.
What was the most extreme apparent temperature in Grand Island?
In Grand Island, between 1940 and 2025, the highest apparent temperature reached 44.9 °C on 12 July 1957, and the lowest was -39.8 °C on 22 December 1989.
Compare Grand Island with another city
Pick a second city: its normals will be set against these, indicator by indicator.
Nearby cities
The climate around Grand Island