Mokena climate — normals and trends
Mokena (United States) has a hot-summer humid continental climate (Dfa) under the Köppen-Geiger classification. Its mean annual temperature is 10.1 °C and it receives 938 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 (23.4 °C on average) and the coldest is January (-4.8 °C). Rainfall peaks in May.
Mokena averages 118 frost days, 28 hot days (≥ 30 °C) and 117 rainy days per year.
Mokena has warmed by +2.1 °C between 1940 and 2025, or +0.25 °C per decade. This trend is statistically significant.
The number of frost days there went from about 132 to 104 per year over the period.
The hottest day of the period reached 39.0 °C (on 25 June 1988) and the coldest -32.4 °C (on 31 January 2019).
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
MokenaIllinois
- coords
- 41.53°, -87.89°
- period
- 1940–2025 · 86 yrs
Mean daily temperature
10.1°C
Average daily high
14.8°C
Average daily low
5.5°C
Annual rainfall
938mm
Sunshine / day
8.8h
Mean relative humidity
71%
Average peak wind
19.7km/h
Seasonal range
28.2°C
Frost days (< 0 °C)
118 d/yr
Hot days (≥ 30 °C)
28 d/yr
Rainy days (≥ 1 mm)
117 d/yr
Annual snowfall
67.1 cm
Average feels-like high
12.9 °C
Average feels-like low
2.6 °C
Average peak gust
39.1 km/h
Tropical nights (≥ 20 °C)
29 d/yr
Solar radiation
15.0 MJ/m²
Has the climate changed?
One stripe per year, 1940 to 2025
+2.1 °C
since 1940
+0.3 °C per decade · r² = 0.39 · 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
25 June 1988
Coldest day
-32.4 °C
31 January 2019
Wettest day
94 mm
18 November 2003
Windiest day
53.8 km/h
11 November 1940
Strongest gust
108.4 km/h
10 November 1998
Hottest feels-like
45.0 °C
14 July 1995
Coldest feels-like
-38.1 °C
30 January 2019
Snowiest day
22.5 cm
2 January 1999
Sunniest day
14.5 h
14 June 2014
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 | 30 mm | -23 mm |
| Feb | 1.9 °C | +0.5 °C | 22 mm | -27 mm |
| Mar | 13.2 °C | +5.4 °C | 109 mm | +30 mm |
| Apr | 16.2 °C | +1.2 °C | 79 mm | -24 mm |
| May | 20.1 °C | -0.9 °C | 109 mm | +3 mm |
| Jun | 28.4 °C | +2.1 °C | 139 mm | +37 mm |
| Jul | 29.5 °C | +1.2 °C | 118 mm | +29 mm |
| Aug | 27.0 °C | -0.4 °C | 91 mm | +9 mm |
| Sep | 26.2 °C | +2.4 °C | 37 mm | -38 mm |
| Oct | 19.4 °C | +2.1 °C | 94 mm | +20 mm |
| Nov | 9.9 °C | +1.0 °C | 53 mm | -16 mm |
| Dec | 1.3 °C | -0.5 °C | 64 mm | +4 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 Mokena?
Mokena has a hot-summer humid continental climate (Köppen Dfa). Over 1940-2025, the average annual temperature is 10.1 °C and it receives 938 mm of precipitation per year.
What is the hottest day ever recorded in Mokena?
The hottest day measured in Mokena between 1940 and 2025 was 25 June 1988, reaching 39.0 °C.
What is the coldest day in Mokena?
The coldest day measured in Mokena between 1940 and 2025 was 31 January 2019, at -32.4 °C.
Does it snow in Mokena?
Yes. Mokena gets on average 67.1 cm of snow per year and has around 118 frost days.
Has the climate of Mokena warmed?
Yes: Mokena warmed by +2.1 °C between 1940 and 2025, a statistically significant trend.
What is the wettest day in Mokena?
The wettest day measured in Mokena between 1940 and 2025 was 18 November 2003, with 94 mm of rain in 24 hours.
What was the windiest day in Mokena?
The windiest day measured in Mokena between 1940 and 2025 was 11 November 1940, with winds reaching 53.8 km/h.
What is the warmest month in Mokena?
The warmest month in Mokena is July (23.4 °C on average); the coldest is January (-4.8 °C).
How much does it rain in Mokena?
Mokena receives on average 938 mm of precipitation per year, spread over about 117 rainy days.
Is it sunny in Mokena?
Mokena gets on average 8.8 hours of sunshine per day, roughly 3,212 hours per year over 1940-2025.
What is the biggest single-day snowfall in Mokena?
The heaviest 24-hour snowfall measured in Mokena between 1940 and 2025 was 2 January 1999, with 22.5 cm.
Are there tropical nights in Mokena?
Yes: Mokena has on average 29 tropical nights per year (temperature staying above 20 °C), over 1940-2025.
What was the most extreme apparent temperature in Mokena?
In Mokena, between 1940 and 2025, the highest apparent temperature reached 45.0 °C on 14 July 1995, and the lowest was -38.1 °C on 30 January 2019.
Compare Mokena with another city
Pick a second city: its normals will be set against these, indicator by indicator.
Nearby cities
The climate around Mokena