Janzé climate — normals and trends
Janzé (France) has a temperate oceanic climate (Cfb) under the Köppen-Geiger classification. Its mean annual temperature is 11.3 °C and it receives 696 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 (18.3 °C on average) and the coldest is January (4.8 °C). Rainfall peaks in May.
Janzé averages 33 frost days, 3 hot days (≥ 30 °C) and 125 rainy days per year.
Janzé has warmed by +1.4 °C between 1940 and 2025, or +0.17 °C per decade. This trend is statistically significant.
The number of frost days there went from about 43 to 23 per year over the period.
The hottest day of the period reached 39.6 °C (on 18 July 2022) and the coldest -14.8 °C (on 16 January 1985).
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
JanzéBrittany Region
- coords
- 47.96°, -1.50°
- period
- 1940–2025 · 86 yrs
Mean daily temperature
11.3°C
Average daily high
15.2°C
Average daily low
7.7°C
Annual rainfall
696mm
Sunshine / day
8.3h
Mean relative humidity
80%
Average peak wind
18.3km/h
Seasonal range
13.5°C
Frost days (< 0 °C)
33 d/yr
Hot days (≥ 30 °C)
3 d/yr
Rainy days (≥ 1 mm)
125 d/yr
Annual snowfall
5.5 cm
Average feels-like high
13.1 °C
Average feels-like low
5.3 °C
Average peak gust
37.2 km/h
Tropical nights (≥ 20 °C)
1 d/yr
Solar radiation
11.9 MJ/m²
Has the climate changed?
One stripe per year, 1940 to 2025
+1.4 °C
since 1940
+0.2 °C per decade · r² = 0.33 · 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
39.6 °C
18 July 2022
Coldest day
-14.8 °C
16 January 1985
Wettest day
60 mm
28 July 1983
Windiest day
63.3 km/h
26 December 1999
Strongest gust
126.4 km/h
26 December 1999
Hottest feels-like
40.3 °C
5 August 2003
Coldest feels-like
-20.6 °C
17 January 1985
Snowiest day
12.0 cm
4 January 1979
Sunniest day
15.8 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 | 7.9 °C | +0.5 °C | 193 mm | +129 mm |
| Feb | 9.2 °C | +0.6 °C | 54 mm | -2 mm |
| Mar | 13.5 °C | +1.9 °C | 27 mm | -31 mm |
| Apr | 18.2 °C | +3.9 °C | 65 mm | +8 mm |
| May | 20.4 °C | +2.7 °C | 35 mm | -33 mm |
| Jun | 26.0 °C | +5.0 °C | 44 mm | -10 mm |
| Jul | 25.0 °C | +2.0 °C | 90 mm | +43 mm |
| Aug | 25.8 °C | +3.0 °C | 33 mm | -13 mm |
| Sep | 20.2 °C | -0.1 °C | 45 mm | -5 mm |
| Oct | 17.1 °C | +1.0 °C | 48 mm | -16 mm |
| Nov | 13.3 °C | +2.2 °C | 60 mm | -6 mm |
| Dec | 9.7 °C | +1.4 °C | 74 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 Janzé?
Janzé has a temperate oceanic climate (Köppen Cfb). Over 1940-2025, the average annual temperature is 11.3 °C and it receives 696 mm of precipitation per year.
What is the hottest day ever recorded in Janzé?
The hottest day measured in Janzé between 1940 and 2025 was 18 July 2022, reaching 39.6 °C.
What is the coldest day in Janzé?
The coldest day measured in Janzé between 1940 and 2025 was 16 January 1985, at -14.8 °C.
Does it snow in Janzé?
Yes. Janzé gets on average 5.5 cm of snow per year and has around 33 frost days.
Has the climate of Janzé warmed?
Yes: Janzé warmed by +1.4 °C between 1940 and 2025, a statistically significant trend.
What is the wettest day in Janzé?
The wettest day measured in Janzé between 1940 and 2025 was 28 July 1983, with 60 mm of rain in 24 hours.
What was the windiest day in Janzé?
The windiest day measured in Janzé between 1940 and 2025 was 26 December 1999, with winds reaching 63.3 km/h.
What is the warmest month in Janzé?
The warmest month in Janzé is July (18.3 °C on average); the coldest is January (4.8 °C).
How much does it rain in Janzé?
Janzé receives on average 696 mm of precipitation per year, spread over about 125 rainy days.
Is it sunny in Janzé?
Janzé gets on average 8.3 hours of sunshine per day, roughly 3,030 hours per year over 1940-2025.
What is the biggest single-day snowfall in Janzé?
The heaviest 24-hour snowfall measured in Janzé between 1940 and 2025 was 4 January 1979, with 12.0 cm.
Are there tropical nights in Janzé?
Yes: Janzé has on average 1 tropical nights per year (temperature staying above 20 °C), over 1940-2025.
What was the most extreme apparent temperature in Janzé?
In Janzé, between 1940 and 2025, the highest apparent temperature reached 40.3 °C on 5 August 2003, and the lowest was -20.6 °C on 17 January 1985.
Compare Janzé with another city
Pick a second city: its normals will be set against these, indicator by indicator.
Nearby cities
The climate around Janzé