Dinan climate — normals and trends
Dinan (France) has a temperate oceanic climate (Cfb) under the Köppen-Geiger classification. Its mean annual temperature is 11.4 °C and it receives 737 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 (17.6 °C on average) and the coldest is January (5.5 °C). Rainfall peaks in May.
Dinan averages 22 frost days, 2 hot days (≥ 30 °C) and 137 rainy days per year.
Dinan has warmed by +1.3 °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 30 to 14 per year over the period.
The hottest day of the period reached 37.9 °C (on 18 July 2022) and the coldest -12.9 °C (on 17 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
DinanBrittany Region
- coords
- 48.46°, -2.05°
- period
- 1940–2025 · 86 yrs
Mean daily temperature
11.4°C
Average daily high
14.8°C
Average daily low
8.3°C
Annual rainfall
737mm
Sunshine / day
8.7h
Mean relative humidity
80%
Average peak wind
20.6km/h
Seasonal range
12.1°C
Frost days (< 0 °C)
22 d/yr
Hot days (≥ 30 °C)
2 d/yr
Rainy days (≥ 1 mm)
137 d/yr
Annual snowfall
5.2 cm
Average feels-like high
12.7 °C
Average feels-like low
5.6 °C
Average peak gust
39.4 km/h
Tropical nights (≥ 20 °C)
0 d/yr
Solar radiation
12.6 MJ/m²
Has the climate changed?
One stripe per year, 1940 to 2025
+1.3 °C
since 1940
+0.2 °C per decade · r² = 0.35 · 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
37.9 °C
18 July 2022
Coldest day
-12.9 °C
17 January 1985
Wettest day
61 mm
29 June 1986
Windiest day
65.0 km/h
16 October 1987
Strongest gust
122.4 km/h
23 November 1984
Hottest feels-like
39.7 °C
5 August 2003
Coldest feels-like
-19.1 °C
17 January 1985
Snowiest day
11.8 cm
4 January 1979
Sunniest day
15.8 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 | 8.3 °C | +0.3 °C | 163 mm | +100 mm |
| Feb | 9.7 °C | +0.9 °C | 53 mm | -4 mm |
| Mar | 12.7 °C | +1.3 °C | 29 mm | -30 mm |
| Apr | 17.3 °C | +3.6 °C | 51 mm | -9 mm |
| May | 18.8 °C | +2.0 °C | 35 mm | -36 mm |
| Jun | 23.8 °C | +4.1 °C | 40 mm | -19 mm |
| Jul | 23.0 °C | +1.3 °C | 102 mm | +50 mm |
| Aug | 24.0 °C | +2.3 °C | 36 mm | -19 mm |
| Sep | 19.9 °C | +0.1 °C | 60 mm | +4 mm |
| Oct | 16.8 °C | +0.8 °C | 53 mm | -14 mm |
| Nov | 13.4 °C | +1.9 °C | 58 mm | -13 mm |
| Dec | 9.9 °C | +1.0 °C | 69 mm | +2 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 Dinan?
Dinan has a temperate oceanic climate (Köppen Cfb). Over 1940-2025, the average annual temperature is 11.4 °C and it receives 737 mm of precipitation per year.
What is the hottest day ever recorded in Dinan?
The hottest day measured in Dinan between 1940 and 2025 was 18 July 2022, reaching 37.9 °C.
What is the coldest day in Dinan?
The coldest day measured in Dinan between 1940 and 2025 was 17 January 1985, at -12.9 °C.
Does it snow in Dinan?
Yes. Dinan gets on average 5.2 cm of snow per year and has around 22 frost days.
Has the climate of Dinan warmed?
Yes: Dinan warmed by +1.3 °C between 1940 and 2025, a statistically significant trend.
What is the wettest day in Dinan?
The wettest day measured in Dinan between 1940 and 2025 was 29 June 1986, with 61 mm of rain in 24 hours.
What was the windiest day in Dinan?
The windiest day measured in Dinan between 1940 and 2025 was 16 October 1987, with winds reaching 65.0 km/h.
What is the warmest month in Dinan?
The warmest month in Dinan is July (17.6 °C on average); the coldest is January (5.5 °C).
How much does it rain in Dinan?
Dinan receives on average 737 mm of precipitation per year, spread over about 137 rainy days.
Is it sunny in Dinan?
Dinan gets on average 8.7 hours of sunshine per day, roughly 3,175 hours per year over 1940-2025.
What is the biggest single-day snowfall in Dinan?
The heaviest 24-hour snowfall measured in Dinan between 1940 and 2025 was 4 January 1979, with 11.8 cm.
Are there tropical nights in Dinan?
Almost never: tropical nights (temperature staying above 20 °C) are virtually non-existent in Dinan.
What was the most extreme apparent temperature in Dinan?
In Dinan, between 1940 and 2025, the highest apparent temperature reached 39.7 °C on 5 August 2003, and the lowest was -19.1 °C on 17 January 1985.
Compare Dinan with another city
Pick a second city: its normals will be set against these, indicator by indicator.
Nearby cities
The climate around Dinan