Galesburg climate — normals and trends
Galesburg (United States) has a hot-summer humid continental climate (Dfa) under the Köppen-Geiger classification. Its mean annual temperature is 10.3 °C and it receives 937 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 (23.8 °C on average) and the coldest is January (-5.1 °C). Rainfall peaks in May.
Galesburg averages 117 frost days, 31 hot days (≥ 30 °C) and 112 rainy days per year.
Galesburg has warmed by +2.0 °C between 1940 and 2025, or +0.23 °C per decade. This trend is statistically significant.
The number of frost days there went from about 128 to 106 per year over the period.
The hottest day of the period reached 39.3 °C (on 7 July 2012) and the coldest -35.3 °C (on 3 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
GalesburgIllinois
- coords
- 40.95°, -90.37°
- period
- 1940–2025 · 86 yrs
Mean daily temperature
10.3°C
Average daily high
15.2°C
Average daily low
5.6°C
Annual rainfall
937mm
Sunshine / day
8.9h
Mean relative humidity
71%
Average peak wind
19.6km/h
Seasonal range
28.9°C
Frost days (< 0 °C)
117 d/yr
Hot days (≥ 30 °C)
31 d/yr
Rainy days (≥ 1 mm)
112 d/yr
Annual snowfall
62.2 cm
Average feels-like high
13.3 °C
Average feels-like low
2.7 °C
Average peak gust
38.6 km/h
Tropical nights (≥ 20 °C)
33 d/yr
Solar radiation
15.2 MJ/m²
Has the climate changed?
One stripe per year, 1940 to 2025
+2.0 °C
since 1940
+0.2 °C per decade · r² = 0.35 · 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
39.3 °C
7 July 2012
Coldest day
-35.3 °C
3 February 1996
Wettest day
101 mm
25 June 2021
Windiest day
52.6 km/h
6 April 1997
Strongest gust
102.6 km/h
25 June 2021
Hottest feels-like
44.1 °C
13 July 1995
Coldest feels-like
-40.6 °C
3 February 1996
Snowiest day
23.2 cm
15 December 1987
Sunniest day
14.2 h
1 July 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 | -0.9 °C | +0.1 °C | 23 mm | -24 mm |
| Feb | 2.0 °C | +0.3 °C | 15 mm | -31 mm |
| Mar | 13.7 °C | +5.4 °C | 103 mm | +23 mm |
| Apr | 17.3 °C | +1.6 °C | 89 mm | -17 mm |
| May | 22.9 °C | +1.3 °C | 73 mm | -38 mm |
| Jun | 30.1 °C | +3.3 °C | 78 mm | -26 mm |
| Jul | 30.9 °C | +2.3 °C | 135 mm | +49 mm |
| Aug | 27.8 °C | 0.0 °C | 74 mm | -10 mm |
| Sep | 28.2 °C | +4.1 °C | 24 mm | -60 mm |
| Oct | 21.2 °C | +3.6 °C | 39 mm | -34 mm |
| Nov | 10.8 °C | +1.9 °C | 54 mm | -9 mm |
| Dec | 1.8 °C | 0.0 °C | 55 mm | +1 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 Galesburg?
Galesburg has a hot-summer humid continental climate (Köppen Dfa). Over 1940-2025, the average annual temperature is 10.3 °C and it receives 937 mm of precipitation per year.
What is the hottest day ever recorded in Galesburg?
The hottest day measured in Galesburg between 1940 and 2025 was 7 July 2012, reaching 39.3 °C.
What is the coldest day in Galesburg?
The coldest day measured in Galesburg between 1940 and 2025 was 3 February 1996, at -35.3 °C.
Does it snow in Galesburg?
Yes. Galesburg gets on average 62.2 cm of snow per year and has around 117 frost days.
Has the climate of Galesburg warmed?
Yes: Galesburg warmed by +2.0 °C between 1940 and 2025, a statistically significant trend.
What is the wettest day in Galesburg?
The wettest day measured in Galesburg between 1940 and 2025 was 25 June 2021, with 101 mm of rain in 24 hours.
What was the windiest day in Galesburg?
The windiest day measured in Galesburg between 1940 and 2025 was 6 April 1997, with winds reaching 52.6 km/h.
What is the warmest month in Galesburg?
The warmest month in Galesburg is July (23.8 °C on average); the coldest is January (-5.1 °C).
How much does it rain in Galesburg?
Galesburg receives on average 937 mm of precipitation per year, spread over about 112 rainy days.
Is it sunny in Galesburg?
Galesburg 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 Galesburg?
The heaviest 24-hour snowfall measured in Galesburg between 1940 and 2025 was 15 December 1987, with 23.2 cm.
Are there tropical nights in Galesburg?
Yes: Galesburg has on average 33 tropical nights per year (temperature staying above 20 °C), over 1940-2025.
What was the most extreme apparent temperature in Galesburg?
In Galesburg, between 1940 and 2025, the highest apparent temperature reached 44.1 °C on 13 July 1995, and the lowest was -40.6 °C on 3 February 1996.
Compare Galesburg with another city
Pick a second city: its normals will be set against these, indicator by indicator.
Nearby cities
The climate around Galesburg