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 9.1 °C and it receives 1,022 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 (22.1 °C on average) and the coldest is January (-3.9 °C). Rainfall peaks in July.
Grand Island averages 108 frost days, 2 hot days (≥ 30 °C) and 147 rainy days per year.
Grand Island has warmed by +1.5 °C between 1940 and 2025, or +0.18 °C per decade. This trend is statistically significant.
The number of frost days there went from about 121 to 95 per year over the period.
The hottest day of the period reached 34.3 °C (on 3 September 1953) and the coldest -26.1 °C (on 18 February 1979).
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 IslandNew York
- coords
- 43.03°, -78.96°
- period
- 1940–2025 · 86 yrs
Mean daily temperature
9.1°C
Average daily high
12.4°C
Average daily low
5.9°C
Annual rainfall
1,022mm
Sunshine / day
8.6h
Mean relative humidity
74%
Average peak wind
21.4km/h
Seasonal range
26.0°C
Frost days (< 0 °C)
108 d/yr
Hot days (≥ 30 °C)
2 d/yr
Rainy days (≥ 1 mm)
147 d/yr
Annual snowfall
109.2 cm
Average feels-like high
10.0 °C
Average feels-like low
2.6 °C
Average peak gust
40.6 km/h
Tropical nights (≥ 20 °C)
25 d/yr
Solar radiation
14.0 MJ/m²
Has the climate changed?
One stripe per year, 1940 to 2025
+1.5 °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
34.3 °C
3 September 1953
Coldest day
-26.1 °C
18 February 1979
Wettest day
80 mm
14 September 1979
Windiest day
57.5 km/h
6 April 1979
Strongest gust
114.8 km/h
6 April 1979
Hottest feels-like
38.7 °C
3 September 1953
Coldest feels-like
-32.6 °C
17 January 1982
Snowiest day
28.4 cm
7 February 1942
Sunniest day
14.9 h
28 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 | -1.6 °C | -0.6 °C | 48 mm | -23 mm |
| Feb | -0.6 °C | -0.1 °C | 84 mm | +18 mm |
| Mar | 7.7 °C | +3.7 °C | 76 mm | -6 mm |
| Apr | 11.0 °C | +0.5 °C | 94 mm | +1 mm |
| May | 16.0 °C | -1.3 °C | 122 mm | +31 mm |
| Jun | 23.3 °C | +0.4 °C | 62 mm | -34 mm |
| Jul | 26.7 °C | +1.3 °C | 68 mm | -31 mm |
| Aug | 24.5 °C | -0.1 °C | 59 mm | -30 mm |
| Sep | 22.3 °C | +1.5 °C | 28 mm | -59 mm |
| Oct | 15.8 °C | +1.2 °C | 99 mm | +14 mm |
| Nov | 7.5 °C | -0.6 °C | 77 mm | -8 mm |
| Dec | 1.6 °C | -0.5 °C | 91 mm | +13 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 9.1 °C and it receives 1,022 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 3 September 1953, reaching 34.3 °C.
What is the coldest day in Grand Island?
The coldest day measured in Grand Island between 1940 and 2025 was 18 February 1979, at -26.1 °C.
Does it snow in Grand Island?
Yes. Grand Island gets on average 109.2 cm of snow per year and has around 108 frost days.
Has the climate of Grand Island warmed?
Yes: Grand Island warmed by +1.5 °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 14 September 1979, with 80 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 6 April 1979, with winds reaching 57.5 km/h.
What is the warmest month in Grand Island?
The warmest month in Grand Island is July (22.1 °C on average); the coldest is January (-3.9 °C).
How much does it rain in Grand Island?
Grand Island receives on average 1,022 mm of precipitation per year, spread over about 147 rainy days.
Is it sunny in Grand Island?
Grand Island gets on average 8.6 hours of sunshine per day, roughly 3,139 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 7 February 1942, with 28.4 cm.
Are there tropical nights in Grand Island?
Yes: Grand Island has on average 25 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 38.7 °C on 3 September 1953, and the lowest was -32.6 °C on 17 January 1982.
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