Machesney Park climate — normals and trends
Machesney Park (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 874 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 (22.8 °C on average) and the coldest is January (-6.4 °C). Rainfall peaks in May.
Machesney Park averages 129 frost days, 22 hot days (≥ 30 °C) and 112 rainy days per year.
Machesney Park has warmed by +2.1 °C between 1940 and 2025, or +0.24 °C per decade. This trend is statistically significant.
The number of frost days there went from about 141 to 117 per year over the period.
The hottest day of the period reached 39.0 °C (on 17 August 1988) and the coldest -34.9 °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
Machesney ParkIllinois
- coords
- 42.35°, -89.04°
- period
- 1940–2025 · 86 yrs
Mean daily temperature
9.1°C
Average daily high
13.9°C
Average daily low
4.4°C
Annual rainfall
874mm
Sunshine / day
8.7h
Mean relative humidity
71%
Average peak wind
19.4km/h
Seasonal range
29.2°C
Frost days (< 0 °C)
129 d/yr
Hot days (≥ 30 °C)
22 d/yr
Rainy days (≥ 1 mm)
112 d/yr
Annual snowfall
75.4 cm
Average feels-like high
11.7 °C
Average feels-like low
1.4 °C
Average peak gust
38.3 km/h
Tropical nights (≥ 20 °C)
21 d/yr
Solar radiation
14.8 MJ/m²
Has the climate changed?
One stripe per year, 1940 to 2025
+2.1 °C
since 1940
+0.2 °C per decade · r² = 0.38 · 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
39.0 °C
17 August 1988
Coldest day
-34.9 °C
3 February 1996
Wettest day
112 mm
13 September 2008
Windiest day
52.4 km/h
6 April 1997
Strongest gust
107.6 km/h
30 April 1984
Hottest feels-like
42.9 °C
13 July 1995
Coldest feels-like
-40.8 °C
3 February 1996
Snowiest day
24.5 cm
15 December 1987
Sunniest day
14.5 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 | -1.8 °C | +0.7 °C | 17 mm | -29 mm |
| Feb | -0.2 °C | -0.2 °C | 23 mm | -16 mm |
| Mar | 12.0 °C | +5.3 °C | 101 mm | +32 mm |
| Apr | 15.3 °C | +1.1 °C | 77 mm | -20 mm |
| May | 20.5 °C | 0.0 °C | 74 mm | -24 mm |
| Jun | 28.5 °C | +2.7 °C | 103 mm | +6 mm |
| Jul | 29.1 °C | +1.4 °C | 137 mm | +52 mm |
| Aug | 26.5 °C | -0.3 °C | 111 mm | +29 mm |
| Sep | 25.2 °C | +2.3 °C | 62 mm | -18 mm |
| Oct | 18.5 °C | +2.2 °C | 36 mm | -33 mm |
| Nov | 8.9 °C | +1.3 °C | 49 mm | -11 mm |
| Dec | 0.0 °C | -0.4 °C | 60 mm | +9 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 Machesney Park?
Machesney Park has a hot-summer humid continental climate (Köppen Dfa). Over 1940-2025, the average annual temperature is 9.1 °C and it receives 874 mm of precipitation per year.
What is the hottest day ever recorded in Machesney Park?
The hottest day measured in Machesney Park between 1940 and 2025 was 17 August 1988, reaching 39.0 °C.
What is the coldest day in Machesney Park?
The coldest day measured in Machesney Park between 1940 and 2025 was 3 February 1996, at -34.9 °C.
Does it snow in Machesney Park?
Yes. Machesney Park gets on average 75.4 cm of snow per year and has around 129 frost days.
Has the climate of Machesney Park warmed?
Yes: Machesney Park warmed by +2.1 °C between 1940 and 2025, a statistically significant trend.
What is the wettest day in Machesney Park?
The wettest day measured in Machesney Park between 1940 and 2025 was 13 September 2008, with 112 mm of rain in 24 hours.
What was the windiest day in Machesney Park?
The windiest day measured in Machesney Park between 1940 and 2025 was 6 April 1997, with winds reaching 52.4 km/h.
What is the warmest month in Machesney Park?
The warmest month in Machesney Park is July (22.8 °C on average); the coldest is January (-6.4 °C).
How much does it rain in Machesney Park?
Machesney Park receives on average 874 mm of precipitation per year, spread over about 112 rainy days.
Is it sunny in Machesney Park?
Machesney Park gets on average 8.7 hours of sunshine per day, roughly 3,175 hours per year over 1940-2025.
What is the biggest single-day snowfall in Machesney Park?
The heaviest 24-hour snowfall measured in Machesney Park between 1940 and 2025 was 15 December 1987, with 24.5 cm.
Are there tropical nights in Machesney Park?
Yes: Machesney Park has on average 21 tropical nights per year (temperature staying above 20 °C), over 1940-2025.
What was the most extreme apparent temperature in Machesney Park?
In Machesney Park, between 1940 and 2025, the highest apparent temperature reached 42.9 °C on 13 July 1995, and the lowest was -40.8 °C on 3 February 1996.
Compare Machesney Park with another city
Pick a second city: its normals will be set against these, indicator by indicator.
Nearby cities
The climate around Machesney Park