Dereham climate — normals and trends
Dereham (United Kingdom) has a temperate oceanic climate (Cfb) under the Köppen-Geiger classification. Its mean annual temperature is 9.9 °C and it receives 657 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 (16.4 °C on average) and the coldest is January (4.1 °C). Rainfall peaks in August.
Dereham averages 25 frost days, 0 hot days (≥ 30 °C) and 136 rainy days per year.
Dereham has warmed by +1.6 °C between 1940 and 2025, or +0.19 °C per decade. This trend is statistically significant.
The number of frost days there went from about 39 to 11 per year over the period.
The hottest day of the period reached 35.8 °C (on 19 July 2022) and the coldest -13.0 °C (on 24 February 1947).
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
DerehamEngland
- coords
- 52.68°, 0.93°
- period
- 1940–2025 · 86 yrs
Mean daily temperature
9.9°C
Average daily high
12.6°C
Average daily low
7.2°C
Annual rainfall
657mm
Sunshine / day
8.2h
Mean relative humidity
80%
Average peak wind
24.4km/h
Seasonal range
12.3°C
Frost days (< 0 °C)
25 d/yr
Hot days (≥ 30 °C)
0 d/yr
Rainy days (≥ 1 mm)
136 d/yr
Annual snowfall
13.6 cm
Average feels-like high
9.5 °C
Average feels-like low
3.7 °C
Average peak gust
42.2 km/h
Tropical nights (≥ 20 °C)
0 d/yr
Solar radiation
11.2 MJ/m²
Has the climate changed?
One stripe per year, 1940 to 2025
+1.6 °C
since 1940
+0.2 °C per decade · r² = 0.44 · 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
35.8 °C
19 July 2022
Coldest day
-13.0 °C
24 February 1947
Wettest day
55 mm
29 July 1969
Windiest day
68.8 km/h
16 October 1987
Strongest gust
126.7 km/h
9 February 2020
Hottest feels-like
33.4 °C
19 July 2022
Coldest feels-like
-18.2 °C
24 February 1947
Snowiest day
11.3 cm
25 February 1958
Sunniest day
16.0 h
3 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 | 6.0 °C | 0.0 °C | 58 mm | +7 mm |
| Feb | 6.9 °C | +0.5 °C | 44 mm | +1 mm |
| Mar | 11.2 °C | +2.6 °C | 8 mm | -40 mm |
| Apr | 14.1 °C | +3.0 °C | 14 mm | -34 mm |
| May | 16.3 °C | +2.0 °C | 42 mm | -15 mm |
| Jun | 21.9 °C | +4.5 °C | 40 mm | -17 mm |
| Jul | 21.6 °C | +1.9 °C | 85 mm | +24 mm |
| Aug | 21.3 °C | +1.6 °C | 32 mm | -32 mm |
| Sep | 18.4 °C | +0.9 °C | 49 mm | -8 mm |
| Oct | 14.1 °C | +0.2 °C | 72 mm | +14 mm |
| Nov | 10.9 °C | +1.4 °C | 107 mm | +48 mm |
| Dec | 9.2 °C | +2.1 °C | 42 mm | -12 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 Dereham?
Dereham has a temperate oceanic climate (Köppen Cfb). Over 1940-2025, the average annual temperature is 9.9 °C and it receives 657 mm of precipitation per year.
What is the hottest day ever recorded in Dereham?
The hottest day measured in Dereham between 1940 and 2025 was 19 July 2022, reaching 35.8 °C.
What is the coldest day in Dereham?
The coldest day measured in Dereham between 1940 and 2025 was 24 February 1947, at -13.0 °C.
Does it snow in Dereham?
Yes. Dereham gets on average 13.6 cm of snow per year and has around 25 frost days.
Has the climate of Dereham warmed?
Yes: Dereham warmed by +1.6 °C between 1940 and 2025, a statistically significant trend.
What is the wettest day in Dereham?
The wettest day measured in Dereham between 1940 and 2025 was 29 July 1969, with 55 mm of rain in 24 hours.
What was the windiest day in Dereham?
The windiest day measured in Dereham between 1940 and 2025 was 16 October 1987, with winds reaching 68.8 km/h.
What is the warmest month in Dereham?
The warmest month in Dereham is July (16.4 °C on average); the coldest is January (4.1 °C).
How much does it rain in Dereham?
Dereham receives on average 657 mm of precipitation per year, spread over about 136 rainy days.
Is it sunny in Dereham?
Dereham 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 Dereham?
The heaviest 24-hour snowfall measured in Dereham between 1940 and 2025 was 25 February 1958, with 11.3 cm.
Are there tropical nights in Dereham?
Almost never: tropical nights (temperature staying above 20 °C) are virtually non-existent in Dereham.
What was the most extreme apparent temperature in Dereham?
In Dereham, between 1940 and 2025, the highest apparent temperature reached 33.4 °C on 19 July 2022, and the lowest was -18.2 °C on 24 February 1947.
Compare Dereham with another city
Pick a second city: its normals will be set against these, indicator by indicator.
Nearby cities
The climate around Dereham