Dieppe climate — normals and trends
Dieppe (France) has a temperate oceanic climate (Cfb) under the Köppen-Geiger classification. Its mean annual temperature is 10.9 °C and it receives 808 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 August (17.2 °C on average) and the coldest is January (5.0 °C). Rainfall peaks in November.
Dieppe averages 16 frost days, 0 hot days (≥ 30 °C) and 149 rainy days per year.
Dieppe has warmed by +1.8 °C between 1940 and 2025, or +0.21 °C per decade. This trend is statistically significant.
The number of frost days there went from about 26 to 6 per year over the period.
The hottest day of the period reached 34.4 °C (on 19 July 2022) and the coldest -11.8 °C (on 8 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
DieppeNormandy
- coords
- 49.92°, 1.08°
- period
- 1940–2025 · 86 yrs
Mean daily temperature
10.9°C
Average daily high
13.0°C
Average daily low
8.8°C
Annual rainfall
808mm
Sunshine / day
8.6h
Mean relative humidity
81%
Average peak wind
26.3km/h
Seasonal range
12.2°C
Frost days (< 0 °C)
16 d/yr
Hot days (≥ 30 °C)
0 d/yr
Rainy days (≥ 1 mm)
149 d/yr
Annual snowfall
10.2 cm
Average feels-like high
10.2 °C
Average feels-like low
5.2 °C
Average peak gust
42.0 km/h
Tropical nights (≥ 20 °C)
0 d/yr
Solar radiation
12.2 MJ/m²
Has the climate changed?
One stripe per year, 1940 to 2025
+1.8 °C
since 1940
+0.2 °C per decade · r² = 0.46 · 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
34.4 °C
19 July 2022
Coldest day
-11.8 °C
8 January 1985
Wettest day
55 mm
4 July 1975
Windiest day
73.8 km/h
25 January 1990
Strongest gust
128.9 km/h
25 January 1990
Hottest feels-like
35.6 °C
25 July 2019
Coldest feels-like
-18.8 °C
19 January 1963
Snowiest day
10.6 cm
11 March 2013
Sunniest day
16.0 h
15 June 1940
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 | 6.6 °C | 0.0 °C | 161 mm | +89 mm |
| Feb | 7.6 °C | +0.5 °C | 53 mm | -7 mm |
| Mar | 11.1 °C | +1.9 °C | 22 mm | -37 mm |
| Apr | 15.2 °C | +3.7 °C | 23 mm | -33 mm |
| May | 16.1 °C | +1.5 °C | 38 mm | -22 mm |
| Jun | 20.0 °C | +2.7 °C | 66 mm | +11 mm |
| Jul | 20.6 °C | +1.2 °C | 75 mm | +19 mm |
| Aug | 21.6 °C | +1.9 °C | 29 mm | -33 mm |
| Sep | 18.6 °C | +0.6 °C | 81 mm | +12 mm |
| Oct | 15.4 °C | +0.7 °C | 121 mm | +39 mm |
| Nov | 11.9 °C | +1.5 °C | 107 mm | +14 mm |
| Dec | 9.4 °C | +1.6 °C | 58 mm | -28 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 Dieppe?
Dieppe has a temperate oceanic climate (Köppen Cfb). Over 1940-2025, the average annual temperature is 10.9 °C and it receives 808 mm of precipitation per year.
What is the hottest day ever recorded in Dieppe?
The hottest day measured in Dieppe between 1940 and 2025 was 19 July 2022, reaching 34.4 °C.
What is the coldest day in Dieppe?
The coldest day measured in Dieppe between 1940 and 2025 was 8 January 1985, at -11.8 °C.
Does it snow in Dieppe?
Yes. Dieppe gets on average 10.2 cm of snow per year and has around 16 frost days.
Has the climate of Dieppe warmed?
Yes: Dieppe warmed by +1.8 °C between 1940 and 2025, a statistically significant trend.
What is the wettest day in Dieppe?
The wettest day measured in Dieppe between 1940 and 2025 was 4 July 1975, with 55 mm of rain in 24 hours.
What was the windiest day in Dieppe?
The windiest day measured in Dieppe between 1940 and 2025 was 25 January 1990, with winds reaching 73.8 km/h.
What is the warmest month in Dieppe?
The warmest month in Dieppe is August (17.2 °C on average); the coldest is January (5.0 °C).
How much does it rain in Dieppe?
Dieppe receives on average 808 mm of precipitation per year, spread over about 149 rainy days.
Is it sunny in Dieppe?
Dieppe gets on average 8.6 hours of sunshine per day, roughly 3,139 hours per year over 1940-2025.
What is the biggest single-day snowfall in Dieppe?
The heaviest 24-hour snowfall measured in Dieppe between 1940 and 2025 was 11 March 2013, with 10.6 cm.
Are there tropical nights in Dieppe?
Almost never: tropical nights (temperature staying above 20 °C) are virtually non-existent in Dieppe.
What was the most extreme apparent temperature in Dieppe?
In Dieppe, between 1940 and 2025, the highest apparent temperature reached 35.6 °C on 25 July 2019, and the lowest was -18.8 °C on 19 January 1963.
Compare Dieppe with another city
Pick a second city: its normals will be set against these, indicator by indicator.
Nearby cities
The climate around Dieppe