West Mersea climate — normals and trends
West Mersea (United Kingdom) has a temperate oceanic climate (Cfb) under the Köppen-Geiger classification. Its mean annual temperature is 10.5 °C and it receives 583 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 (17.1 °C on average) and the coldest is February (4.8 °C). Rainfall peaks in November.
West Mersea averages 12 frost days, 0 hot days (≥ 30 °C) and 123 rainy days per year.
West Mersea has warmed by +1.7 °C between 1940 and 2025, or +0.20 °C per decade. This trend is statistically significant.
The number of frost days there went from about 20 to 4 per year over the period.
The hottest day of the period reached 29.1 °C (on 19 July 2022) and the coldest -8.0 °C (on 12 January 1987).
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
West MerseaEngland
- coords
- 51.78°, 0.92°
- period
- 1940–2025 · 86 yrs
Mean daily temperature
10.5°C
Average daily high
12.6°C
Average daily low
8.5°C
Annual rainfall
583mm
Sunshine / day
8.2h
Mean relative humidity
80%
Average peak wind
27.1km/h
Seasonal range
12.3°C
Frost days (< 0 °C)
12 d/yr
Hot days (≥ 30 °C)
0 d/yr
Rainy days (≥ 1 mm)
123 d/yr
Annual snowfall
10.1 cm
Average feels-like high
9.6 °C
Average feels-like low
4.7 °C
Average peak gust
42.8 km/h
Tropical nights (≥ 20 °C)
0 d/yr
Solar radiation
11.4 MJ/m²
Has the climate changed?
One stripe per year, 1940 to 2025
+1.7 °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
29.1 °C
19 July 2022
Coldest day
-8.0 °C
12 January 1987
Wettest day
53 mm
3 September 1965
Windiest day
83.0 km/h
16 October 1987
Strongest gust
134.3 km/h
16 October 1987
Hottest feels-like
30.6 °C
25 July 2019
Coldest feels-like
-14.1 °C
1 February 1956
Snowiest day
15.9 cm
4 March 1970
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 | 6.3 °C | -0.2 °C | 62 mm | +11 mm |
| Feb | 7.0 °C | +0.5 °C | 52 mm | +10 mm |
| Mar | 10.1 °C | +1.8 °C | 11 mm | -30 mm |
| Apr | 12.7 °C | +1.9 °C | 23 mm | -17 mm |
| May | 15.9 °C | +2.0 °C | 21 mm | -25 mm |
| Jun | 20.7 °C | +3.5 °C | 40 mm | -6 mm |
| Jul | 21.8 °C | +2.4 °C | 71 mm | +23 mm |
| Aug | 21.1 °C | +1.4 °C | 27 mm | -24 mm |
| Sep | 18.1 °C | +0.6 °C | 35 mm | -14 mm |
| Oct | 14.5 °C | +0.4 °C | 70 mm | +13 mm |
| Nov | 11.2 °C | +1.2 °C | 80 mm | +21 mm |
| Dec | 9.5 °C | +1.8 °C | 40 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 West Mersea?
West Mersea has a temperate oceanic climate (Köppen Cfb). Over 1940-2025, the average annual temperature is 10.5 °C and it receives 583 mm of precipitation per year.
What is the hottest day ever recorded in West Mersea?
The hottest day measured in West Mersea between 1940 and 2025 was 19 July 2022, reaching 29.1 °C.
What is the coldest day in West Mersea?
The coldest day measured in West Mersea between 1940 and 2025 was 12 January 1987, at -8.0 °C.
Does it snow in West Mersea?
Yes. West Mersea gets on average 10.1 cm of snow per year and has around 12 frost days.
Has the climate of West Mersea warmed?
Yes: West Mersea warmed by +1.7 °C between 1940 and 2025, a statistically significant trend.
What is the wettest day in West Mersea?
The wettest day measured in West Mersea between 1940 and 2025 was 3 September 1965, with 53 mm of rain in 24 hours.
What was the windiest day in West Mersea?
The windiest day measured in West Mersea between 1940 and 2025 was 16 October 1987, with winds reaching 83.0 km/h.
What is the warmest month in West Mersea?
The warmest month in West Mersea is August (17.1 °C on average); the coldest is February (4.8 °C).
How much does it rain in West Mersea?
West Mersea receives on average 583 mm of precipitation per year, spread over about 123 rainy days.
Is it sunny in West Mersea?
West Mersea 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 West Mersea?
The heaviest 24-hour snowfall measured in West Mersea between 1940 and 2025 was 4 March 1970, with 15.9 cm.
Are there tropical nights in West Mersea?
Almost never: tropical nights (temperature staying above 20 °C) are virtually non-existent in West Mersea.
What was the most extreme apparent temperature in West Mersea?
In West Mersea, between 1940 and 2025, the highest apparent temperature reached 30.6 °C on 25 July 2019, and the lowest was -14.1 °C on 1 February 1956.
Compare West Mersea with another city
Pick a second city: its normals will be set against these, indicator by indicator.
Nearby cities
The climate around West Mersea