Guer climate — normals and trends
Guer (France) has a temperate oceanic climate (Cfb) under the Köppen-Geiger classification. Its mean annual temperature is 11.4 °C and it receives 665 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 (18.1 °C on average) and the coldest is January (5.0 °C). Rainfall peaks in May.
Guer averages 31 frost days, 3 hot days (≥ 30 °C) and 121 rainy days per year.
Guer has warmed by +1.4 °C between 1940 and 2025, or +0.16 °C per decade. This trend is statistically significant.
The number of frost days there went from about 40 to 22 per year over the period.
The hottest day of the period reached 40.3 °C (on 18 July 2022) and the coldest -16.1 °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
GuerBrittany Region
- coords
- 47.90°, -2.12°
- period
- 1940–2025 · 86 yrs
Mean daily temperature
11.4°C
Average daily high
15.2°C
Average daily low
7.7°C
Annual rainfall
665mm
Sunshine / day
8.2h
Mean relative humidity
80%
Average peak wind
19.1km/h
Seasonal range
13.1°C
Frost days (< 0 °C)
31 d/yr
Hot days (≥ 30 °C)
3 d/yr
Rainy days (≥ 1 mm)
121 d/yr
Annual snowfall
5.0 cm
Average feels-like high
13.1 °C
Average feels-like low
5.3 °C
Average peak gust
38.3 km/h
Tropical nights (≥ 20 °C)
1 d/yr
Solar radiation
12.1 MJ/m²
Has the climate changed?
One stripe per year, 1940 to 2025
+1.4 °C
since 1940
+0.2 °C per decade · r² = 0.32 · 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
40.3 °C
18 July 2022
Coldest day
-16.1 °C
16 January 1985
Wettest day
58 mm
19 July 2025
Windiest day
66.2 km/h
26 December 1999
Strongest gust
121.3 km/h
23 November 1984
Hottest feels-like
40.0 °C
5 August 2003
Coldest feels-like
-21.3 °C
16 January 1985
Snowiest day
12.0 cm
4 January 1979
Sunniest day
15.7 h
18 June 1945
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 | 8.1 °C | +0.4 °C | 190 mm | +129 mm |
| Feb | 9.5 °C | +0.7 °C | 49 mm | -4 mm |
| Mar | 13.3 °C | +1.7 °C | 30 mm | -24 mm |
| Apr | 17.9 °C | +3.7 °C | 65 mm | +11 mm |
| May | 20.0 °C | +2.5 °C | 33 mm | -33 mm |
| Jun | 25.6 °C | +4.8 °C | 35 mm | -16 mm |
| Jul | 24.9 °C | +2.1 °C | 115 mm | +71 mm |
| Aug | 25.4 °C | +2.8 °C | 28 mm | -17 mm |
| Sep | 19.9 °C | -0.4 °C | 47 mm | -2 mm |
| Oct | 17.1 °C | +1.0 °C | 46 mm | -17 mm |
| Nov | 13.4 °C | +2.1 °C | 58 mm | -6 mm |
| Dec | 9.8 °C | +1.2 °C | 79 mm | +15 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 Guer?
Guer has a temperate oceanic climate (Köppen Cfb). Over 1940-2025, the average annual temperature is 11.4 °C and it receives 665 mm of precipitation per year.
What is the hottest day ever recorded in Guer?
The hottest day measured in Guer between 1940 and 2025 was 18 July 2022, reaching 40.3 °C.
What is the coldest day in Guer?
The coldest day measured in Guer between 1940 and 2025 was 16 January 1985, at -16.1 °C.
Does it snow in Guer?
Yes. Guer gets on average 5.0 cm of snow per year and has around 31 frost days.
Has the climate of Guer warmed?
Yes: Guer warmed by +1.4 °C between 1940 and 2025, a statistically significant trend.
What is the wettest day in Guer?
The wettest day measured in Guer between 1940 and 2025 was 19 July 2025, with 58 mm of rain in 24 hours.
What was the windiest day in Guer?
The windiest day measured in Guer between 1940 and 2025 was 26 December 1999, with winds reaching 66.2 km/h.
What is the warmest month in Guer?
The warmest month in Guer is July (18.1 °C on average); the coldest is January (5.0 °C).
How much does it rain in Guer?
Guer receives on average 665 mm of precipitation per year, spread over about 121 rainy days.
Is it sunny in Guer?
Guer gets on average 8.2 hours of sunshine per day, roughly 2,993 hours per year over 1940-2025.
What is the biggest single-day snowfall in Guer?
The heaviest 24-hour snowfall measured in Guer between 1940 and 2025 was 4 January 1979, with 12.0 cm.
Are there tropical nights in Guer?
Yes: Guer has on average 1 tropical nights per year (temperature staying above 20 °C), over 1940-2025.
What was the most extreme apparent temperature in Guer?
In Guer, between 1940 and 2025, the highest apparent temperature reached 40.0 °C on 5 August 2003, and the lowest was -21.3 °C on 16 January 1985.
Compare Guer with another city
Pick a second city: its normals will be set against these, indicator by indicator.
Nearby cities
The climate around Guer