Mainz climate — normals and trends
Mainz (Germany) has a temperate oceanic climate (Cfb) under the Köppen-Geiger classification. Its mean annual temperature is 9.7 °C and it receives 658 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 (18.8 °C on average) and the coldest is January (0.7 °C). Rainfall peaks in May.
Mainz averages 68 frost days, 7 hot days (≥ 30 °C) and 133 rainy days per year.
Mainz 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 83 to 53 per year over the period.
The hottest day of the period reached 39.4 °C (on 25 July 2019) and the coldest -24.1 °C (on 27 January 1942).
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
MainzRhineland-Palatinate
- coords
- 49.98°, 8.28°
- period
- 1940–2025 · 86 yrs
Mean daily temperature
9.7°C
Average daily high
13.4°C
Average daily low
6.2°C
Annual rainfall
658mm
Sunshine / day
7.7h
Mean relative humidity
76%
Average peak wind
15.2km/h
Seasonal range
18.1°C
Frost days (< 0 °C)
68 d/yr
Hot days (≥ 30 °C)
7 d/yr
Rainy days (≥ 1 mm)
133 d/yr
Annual snowfall
30.9 cm
Average feels-like high
11.1 °C
Average feels-like low
3.6 °C
Average peak gust
34.1 km/h
Tropical nights (≥ 20 °C)
1 d/yr
Solar radiation
11.1 MJ/m²
Has the climate changed?
One stripe per year, 1940 to 2025
+2.1 °C
since 1940
+0.2 °C per decade · r² = 0.43 · 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
39.4 °C
25 July 2019
Coldest day
-24.1 °C
27 January 1942
Wettest day
42 mm
7 October 1982
Windiest day
47.2 km/h
24 November 1984
Strongest gust
124.6 km/h
18 January 2007
Hottest feels-like
40.1 °C
6 July 1957
Coldest feels-like
-28.4 °C
27 January 1942
Snowiest day
11.7 cm
24 January 1942
Sunniest day
15.1 h
18 June 2000
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 | 5.2 °C | +2.3 °C | 92 mm | +43 mm |
| Feb | 5.4 °C | +0.7 °C | 31 mm | -14 mm |
| Mar | 12.8 °C | +3.6 °C | 13 mm | -38 mm |
| Apr | 16.8 °C | +3.2 °C | 29 mm | -21 mm |
| May | 20.8 °C | +2.8 °C | 41 mm | -23 mm |
| Jun | 26.1 °C | +4.7 °C | 42 mm | -19 mm |
| Jul | 25.8 °C | +2.3 °C | 79 mm | +19 mm |
| Aug | 27.0 °C | +3.8 °C | 39 mm | -23 mm |
| Sep | 19.5 °C | +0.2 °C | 131 mm | +77 mm |
| Oct | 13.6 °C | 0.0 °C | 62 mm | +11 mm |
| Nov | 8.2 °C | +0.9 °C | 44 mm | -12 mm |
| Dec | 5.8 °C | +1.8 °C | 26 mm | -30 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 Mainz?
Mainz has a temperate oceanic climate (Köppen Cfb). Over 1940-2025, the average annual temperature is 9.7 °C and it receives 658 mm of precipitation per year.
What is the hottest day ever recorded in Mainz?
The hottest day measured in Mainz between 1940 and 2025 was 25 July 2019, reaching 39.4 °C.
What is the coldest day in Mainz?
The coldest day measured in Mainz between 1940 and 2025 was 27 January 1942, at -24.1 °C.
Does it snow in Mainz?
Yes. Mainz gets on average 30.9 cm of snow per year and has around 68 frost days.
Has the climate of Mainz warmed?
Yes: Mainz warmed by +2.1 °C between 1940 and 2025, a statistically significant trend.
What is the wettest day in Mainz?
The wettest day measured in Mainz between 1940 and 2025 was 7 October 1982, with 42 mm of rain in 24 hours.
What was the windiest day in Mainz?
The windiest day measured in Mainz between 1940 and 2025 was 24 November 1984, with winds reaching 47.2 km/h.
What is the warmest month in Mainz?
The warmest month in Mainz is July (18.8 °C on average); the coldest is January (0.7 °C).
How much does it rain in Mainz?
Mainz receives on average 658 mm of precipitation per year, spread over about 133 rainy days.
Is it sunny in Mainz?
Mainz gets on average 7.7 hours of sunshine per day, roughly 2,811 hours per year over 1940-2025.
What is the biggest single-day snowfall in Mainz?
The heaviest 24-hour snowfall measured in Mainz between 1940 and 2025 was 24 January 1942, with 11.7 cm.
Are there tropical nights in Mainz?
Yes: Mainz has on average 1 tropical nights per year (temperature staying above 20 °C), over 1940-2025.
What was the most extreme apparent temperature in Mainz?
In Mainz, between 1940 and 2025, the highest apparent temperature reached 40.1 °C on 6 July 1957, and the lowest was -28.4 °C on 27 January 1942.
Compare Mainz with another city
Pick a second city: its normals will be set against these, indicator by indicator.
Nearby cities
The climate around Mainz