Wasco climate — normals and trends
Wasco (United States) has a hot-summer humid continental climate (Dfa) under the Köppen-Geiger classification. Its mean annual temperature is 9.2 °C and it receives 919 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 (22.7 °C on average) and the coldest is January (-6.0 °C). Rainfall peaks in May.
Wasco averages 127 frost days, 20 hot days (≥ 30 °C) and 115 rainy days per year.
Wasco 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 140 to 114 per year over the period.
The hottest day of the period reached 38.1 °C (on 25 June 1988) and the coldest -33.6 °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
WascoIllinois
- coords
- 41.94°, -88.40°
- period
- 1940–2025 · 86 yrs
Mean daily temperature
9.2°C
Average daily high
13.9°C
Average daily low
4.6°C
Annual rainfall
919mm
Sunshine / day
8.7h
Mean relative humidity
71%
Average peak wind
20.1km/h
Seasonal range
28.7°C
Frost days (< 0 °C)
127 d/yr
Hot days (≥ 30 °C)
20 d/yr
Rainy days (≥ 1 mm)
115 d/yr
Annual snowfall
75.3 cm
Average feels-like high
11.7 °C
Average feels-like low
1.5 °C
Average peak gust
39.6 km/h
Tropical nights (≥ 20 °C)
22 d/yr
Solar radiation
14.7 MJ/m²
Has the climate changed?
One stripe per year, 1940 to 2025
+2.1 °C
since 1940
+0.2 °C per decade · r² = 0.37 · 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
38.1 °C
25 June 1988
Coldest day
-33.6 °C
31 January 2019
Wettest day
79 mm
26 August 1987
Windiest day
54.7 km/h
30 April 1984
Strongest gust
118.8 km/h
10 November 1998
Hottest feels-like
42.8 °C
13 July 1995
Coldest feels-like
-39.2 °C
30 January 2019
Snowiest day
22.5 cm
1 January 1948
Sunniest day
14.5 h
22 June 1963
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 | -1.7 °C | +0.5 °C | 37 mm | -12 mm |
| Feb | 0.2 °C | 0.0 °C | 24 mm | -20 mm |
| Mar | 12.3 °C | +5.5 °C | 98 mm | +25 mm |
| Apr | 15.4 °C | +1.2 °C | 87 mm | -16 mm |
| May | 19.7 °C | -0.6 °C | 92 mm | -11 mm |
| Jun | 28.0 °C | +2.4 °C | 111 mm | +11 mm |
| Jul | 28.7 °C | +1.1 °C | 123 mm | +33 mm |
| Aug | 26.2 °C | -0.5 °C | 104 mm | +18 mm |
| Sep | 25.1 °C | +2.2 °C | 76 mm | -4 mm |
| Oct | 18.3 °C | +1.9 °C | 47 mm | -26 mm |
| Nov | 9.0 °C | +1.2 °C | 54 mm | -10 mm |
| Dec | 0.2 °C | -0.5 °C | 63 mm | +7 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 Wasco?
Wasco has a hot-summer humid continental climate (Köppen Dfa). Over 1940-2025, the average annual temperature is 9.2 °C and it receives 919 mm of precipitation per year.
What is the hottest day ever recorded in Wasco?
The hottest day measured in Wasco between 1940 and 2025 was 25 June 1988, reaching 38.1 °C.
What is the coldest day in Wasco?
The coldest day measured in Wasco between 1940 and 2025 was 31 January 2019, at -33.6 °C.
Does it snow in Wasco?
Yes. Wasco gets on average 75.3 cm of snow per year and has around 127 frost days.
Has the climate of Wasco warmed?
Yes: Wasco warmed by +2.1 °C between 1940 and 2025, a statistically significant trend.
What is the wettest day in Wasco?
The wettest day measured in Wasco between 1940 and 2025 was 26 August 1987, with 79 mm of rain in 24 hours.
What was the windiest day in Wasco?
The windiest day measured in Wasco between 1940 and 2025 was 30 April 1984, with winds reaching 54.7 km/h.
What is the warmest month in Wasco?
The warmest month in Wasco is July (22.7 °C on average); the coldest is January (-6.0 °C).
How much does it rain in Wasco?
Wasco receives on average 919 mm of precipitation per year, spread over about 115 rainy days.
Is it sunny in Wasco?
Wasco 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 Wasco?
The heaviest 24-hour snowfall measured in Wasco between 1940 and 2025 was 1 January 1948, with 22.5 cm.
Are there tropical nights in Wasco?
Yes: Wasco has on average 22 tropical nights per year (temperature staying above 20 °C), over 1940-2025.
What was the most extreme apparent temperature in Wasco?
In Wasco, between 1940 and 2025, the highest apparent temperature reached 42.8 °C on 13 July 1995, and the lowest was -39.2 °C on 30 January 2019.
Compare Wasco with another city
Pick a second city: its normals will be set against these, indicator by indicator.
Nearby cities
The climate around Wasco