Hanover climate — normals and trends
Hanover (United States) has a hot-summer humid continental climate (Dfa) under the Köppen-Geiger classification. Its mean annual temperature is 12.0 °C and it receives 1,026 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 (24.2 °C on average) and the coldest is January (-0.5 °C). Rainfall peaks in May.
Hanover averages 89 frost days, 35 hot days (≥ 30 °C) and 117 rainy days per year.
Hanover has warmed by +1.7 °C between 1940 and 2025, or +0.20 °C per decade. This trend is statistically significant.
The number of frost days there went from about 99 to 79 per year over the period.
The hottest day of the period reached 38.7 °C (on 16 July 2024) and the coldest -25.5 °C (on 29 January 1963).
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
HanoverPennsylvania
- coords
- 39.80°, -76.98°
- period
- 1940–2025 · 86 yrs
Mean daily temperature
12.0°C
Average daily high
16.8°C
Average daily low
7.6°C
Annual rainfall
1,026mm
Sunshine / day
8.8h
Mean relative humidity
67%
Average peak wind
16.8km/h
Seasonal range
24.7°C
Frost days (< 0 °C)
89 d/yr
Hot days (≥ 30 °C)
35 d/yr
Rainy days (≥ 1 mm)
117 d/yr
Annual snowfall
64.8 cm
Average feels-like high
15.2 °C
Average feels-like low
5.1 °C
Average peak gust
37.4 km/h
Tropical nights (≥ 20 °C)
38 d/yr
Solar radiation
14.8 MJ/m²
Has the climate changed?
One stripe per year, 1940 to 2025
+1.7 °C
since 1940
+0.2 °C per decade · r² = 0.42 · 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
38.7 °C
16 July 2024
Coldest day
-25.5 °C
29 January 1963
Wettest day
127 mm
22 June 1972
Windiest day
52.0 km/h
9 October 1976
Strongest gust
126.7 km/h
11 February 1981
Hottest feels-like
44.7 °C
15 July 1995
Coldest feels-like
-31.2 °C
19 January 1994
Snowiest day
41.5 cm
13 March 1993
Sunniest day
14.4 h
19 June 2022
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 | 1.6 °C | -1.8 °C | 36 mm | -41 mm |
| Feb | 5.4 °C | +0.2 °C | 55 mm | -19 mm |
| Mar | 15.1 °C | +4.8 °C | 57 mm | -36 mm |
| Apr | 18.4 °C | +1.6 °C | 72 mm | -19 mm |
| May | 21.8 °C | -0.3 °C | 205 mm | +108 mm |
| Jun | 28.0 °C | +1.1 °C | 97 mm | +11 mm |
| Jul | 30.4 °C | +1.2 °C | 163 mm | +73 mm |
| Aug | 26.4 °C | -1.7 °C | 22 mm | -63 mm |
| Sep | 25.6 °C | +1.2 °C | 72 mm | -19 mm |
| Oct | 18.5 °C | +0.3 °C | 70 mm | -8 mm |
| Nov | 11.8 °C | +0.3 °C | 36 mm | -47 mm |
| Dec | 4.0 °C | -1.6 °C | 60 mm | -22 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 Hanover?
Hanover has a hot-summer humid continental climate (Köppen Dfa). Over 1940-2025, the average annual temperature is 12.0 °C and it receives 1,026 mm of precipitation per year.
What is the hottest day ever recorded in Hanover?
The hottest day measured in Hanover between 1940 and 2025 was 16 July 2024, reaching 38.7 °C.
What is the coldest day in Hanover?
The coldest day measured in Hanover between 1940 and 2025 was 29 January 1963, at -25.5 °C.
Does it snow in Hanover?
Yes. Hanover gets on average 64.8 cm of snow per year and has around 89 frost days.
Has the climate of Hanover warmed?
Yes: Hanover warmed by +1.7 °C between 1940 and 2025, a statistically significant trend.
What is the wettest day in Hanover?
The wettest day measured in Hanover between 1940 and 2025 was 22 June 1972, with 127 mm of rain in 24 hours.
What was the windiest day in Hanover?
The windiest day measured in Hanover between 1940 and 2025 was 9 October 1976, with winds reaching 52.0 km/h.
What is the warmest month in Hanover?
The warmest month in Hanover is July (24.2 °C on average); the coldest is January (-0.5 °C).
How much does it rain in Hanover?
Hanover receives on average 1,026 mm of precipitation per year, spread over about 117 rainy days.
Is it sunny in Hanover?
Hanover 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 Hanover?
The heaviest 24-hour snowfall measured in Hanover between 1940 and 2025 was 13 March 1993, with 41.5 cm.
Are there tropical nights in Hanover?
Yes: Hanover has on average 38 tropical nights per year (temperature staying above 20 °C), over 1940-2025.
What was the most extreme apparent temperature in Hanover?
In Hanover, between 1940 and 2025, the highest apparent temperature reached 44.7 °C on 15 July 1995, and the lowest was -31.2 °C on 19 January 1994.
Compare Hanover with another city
Pick a second city: its normals will be set against these, indicator by indicator.
Nearby cities
The climate around Hanover