Germantown climate — normals and trends
Germantown (United States) has a warm-summer humid continental climate (Dfb) under the Köppen-Geiger classification. Its mean annual temperature is 8.2 °C and it receives 848 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 (21.8 °C on average) and the coldest is January (-6.0 °C). Rainfall peaks in April.
Germantown averages 121 frost days, 5 hot days (≥ 30 °C) and 117 rainy days per year.
Germantown has warmed by +1.8 °C between 1940 and 2025, or +0.21 °C per decade. This trend is statistically significant.
The number of frost days there went from about 137 to 105 per year over the period.
The hottest day of the period reached 35.8 °C (on 4 July 2012) and the coldest -31.1 °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
GermantownWisconsin
- coords
- 43.23°, -88.11°
- period
- 1940–2025 · 86 yrs
Mean daily temperature
8.2°C
Average daily high
11.6°C
Average daily low
4.8°C
Annual rainfall
848mm
Sunshine / day
8.8h
Mean relative humidity
72%
Average peak wind
22.4km/h
Seasonal range
27.8°C
Frost days (< 0 °C)
121 d/yr
Hot days (≥ 30 °C)
5 d/yr
Rainy days (≥ 1 mm)
117 d/yr
Annual snowfall
92.2 cm
Average feels-like high
9.1 °C
Average feels-like low
1.2 °C
Average peak gust
39.9 km/h
Tropical nights (≥ 20 °C)
22 d/yr
Solar radiation
14.5 MJ/m²
Has the climate changed?
One stripe per year, 1940 to 2025
+1.8 °C
since 1940
+0.2 °C per decade · r² = 0.28 · 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
35.8 °C
4 July 2012
Coldest day
-31.1 °C
3 February 1996
Wettest day
127 mm
13 September 1961
Windiest day
60.2 km/h
10 November 1998
Strongest gust
111.6 km/h
30 April 1984
Hottest feels-like
40.8 °C
4 July 2012
Coldest feels-like
-38.1 °C
10 January 1982
Snowiest day
24.6 cm
15 December 1987
Sunniest day
14.9 h
19 June 2003
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 | -2.2 °C | +0.5 °C | 6 mm | -42 mm |
| Feb | -0.9 °C | +0.5 °C | 26 mm | -14 mm |
| Mar | 8.0 °C | +4.5 °C | 91 mm | +23 mm |
| Apr | 10.6 °C | +0.9 °C | 66 mm | -26 mm |
| May | 14.3 °C | -1.3 °C | 93 mm | +7 mm |
| Jun | 22.7 °C | +1.0 °C | 85 mm | +2 mm |
| Jul | 25.4 °C | +0.1 °C | 127 mm | +45 mm |
| Aug | 24.2 °C | -0.8 °C | 103 mm | +22 mm |
| Sep | 22.0 °C | +0.9 °C | 50 mm | -27 mm |
| Oct | 16.3 °C | +1.6 °C | 39 mm | -32 mm |
| Nov | 7.7 °C | +0.9 °C | 50 mm | -14 mm |
| Dec | -0.7 °C | -1.0 °C | 59 mm | +5 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 Germantown?
Germantown has a warm-summer humid continental climate (Köppen Dfb). Over 1940-2025, the average annual temperature is 8.2 °C and it receives 848 mm of precipitation per year.
What is the hottest day ever recorded in Germantown?
The hottest day measured in Germantown between 1940 and 2025 was 4 July 2012, reaching 35.8 °C.
What is the coldest day in Germantown?
The coldest day measured in Germantown between 1940 and 2025 was 3 February 1996, at -31.1 °C.
Does it snow in Germantown?
Yes. Germantown gets on average 92.2 cm of snow per year and has around 121 frost days.
Has the climate of Germantown warmed?
Yes: Germantown warmed by +1.8 °C between 1940 and 2025, a statistically significant trend.
What is the wettest day in Germantown?
The wettest day measured in Germantown between 1940 and 2025 was 13 September 1961, with 127 mm of rain in 24 hours.
What was the windiest day in Germantown?
The windiest day measured in Germantown between 1940 and 2025 was 10 November 1998, with winds reaching 60.2 km/h.
What is the warmest month in Germantown?
The warmest month in Germantown is July (21.8 °C on average); the coldest is January (-6.0 °C).
How much does it rain in Germantown?
Germantown receives on average 848 mm of precipitation per year, spread over about 117 rainy days.
Is it sunny in Germantown?
Germantown 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 Germantown?
The heaviest 24-hour snowfall measured in Germantown between 1940 and 2025 was 15 December 1987, with 24.6 cm.
Are there tropical nights in Germantown?
Yes: Germantown has on average 22 tropical nights per year (temperature staying above 20 °C), over 1940-2025.
What was the most extreme apparent temperature in Germantown?
In Germantown, between 1940 and 2025, the highest apparent temperature reached 40.8 °C on 4 July 2012, and the lowest was -38.1 °C on 10 January 1982.
Compare Germantown with another city
Pick a second city: its normals will be set against these, indicator by indicator.
Nearby cities
The climate around Germantown