Harwich climate — normals and trends
Harwich (United Kingdom) has a temperate oceanic climate (Cfb) under the Köppen-Geiger classification. Its mean annual temperature is 10.4 °C and it receives 633 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 (17.0 °C on average) and the coldest is January (4.6 °C). Rainfall peaks in November.
Harwich averages 14 frost days, 0 hot days (≥ 30 °C) and 128 rainy days per year.
Harwich has warmed by +1.7 °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 24 to 4 per year over the period.
The hottest day of the period reached 29.1 °C (on 19 July 2022) and the coldest -9.0 °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
HarwichEngland
- coords
- 51.94°, 1.28°
- period
- 1940–2025 · 86 yrs
Mean daily temperature
10.4°C
Average daily high
12.5°C
Average daily low
8.3°C
Annual rainfall
633mm
Sunshine / day
8.3h
Mean relative humidity
81%
Average peak wind
25.9km/h
Seasonal range
12.4°C
Frost days (< 0 °C)
14 d/yr
Hot days (≥ 30 °C)
0 d/yr
Rainy days (≥ 1 mm)
128 d/yr
Annual snowfall
10.2 cm
Average feels-like high
9.5 °C
Average feels-like low
4.6 °C
Average peak gust
41.1 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
+1.7 °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
29.1 °C
19 July 2022
Coldest day
-9.0 °C
24 February 1947
Wettest day
60 mm
29 July 1969
Windiest day
83.7 km/h
16 October 1987
Strongest gust
134.6 km/h
16 October 1987
Hottest feels-like
30.6 °C
25 July 2019
Coldest feels-like
-14.0 °C
2 February 1956
Snowiest day
11.6 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 | 6.1 °C | -0.2 °C | 63 mm | +7 mm |
| Feb | 6.7 °C | +0.3 °C | 57 mm | +12 mm |
| Mar | 9.9 °C | +1.7 °C | 8 mm | -36 mm |
| Apr | 12.7 °C | +2.1 °C | 17 mm | -25 mm |
| May | 15.9 °C | +2.1 °C | 27 mm | -23 mm |
| Jun | 20.6 °C | +3.5 °C | 44 mm | -5 mm |
| Jul | 21.6 °C | +2.3 °C | 87 mm | +32 mm |
| Aug | 20.8 °C | +1.2 °C | 38 mm | -19 mm |
| Sep | 17.9 °C | +0.5 °C | 42 mm | -11 mm |
| Oct | 14.3 °C | +0.3 °C | 81 mm | +20 mm |
| Nov | 10.9 °C | +1.0 °C | 90 mm | +27 mm |
| Dec | 9.3 °C | +1.8 °C | 46 mm | -14 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 Harwich?
Harwich has a temperate oceanic climate (Köppen Cfb). Over 1940-2025, the average annual temperature is 10.4 °C and it receives 633 mm of precipitation per year.
What is the hottest day ever recorded in Harwich?
The hottest day measured in Harwich between 1940 and 2025 was 19 July 2022, reaching 29.1 °C.
What is the coldest day in Harwich?
The coldest day measured in Harwich between 1940 and 2025 was 24 February 1947, at -9.0 °C.
Does it snow in Harwich?
Yes. Harwich gets on average 10.2 cm of snow per year and has around 14 frost days.
Has the climate of Harwich warmed?
Yes: Harwich warmed by +1.7 °C between 1940 and 2025, a statistically significant trend.
What is the wettest day in Harwich?
The wettest day measured in Harwich between 1940 and 2025 was 29 July 1969, with 60 mm of rain in 24 hours.
What was the windiest day in Harwich?
The windiest day measured in Harwich between 1940 and 2025 was 16 October 1987, with winds reaching 83.7 km/h.
What is the warmest month in Harwich?
The warmest month in Harwich is August (17.0 °C on average); the coldest is January (4.6 °C).
How much does it rain in Harwich?
Harwich receives on average 633 mm of precipitation per year, spread over about 128 rainy days.
Is it sunny in Harwich?
Harwich gets on average 8.3 hours of sunshine per day, roughly 3,030 hours per year over 1940-2025.
What is the biggest single-day snowfall in Harwich?
The heaviest 24-hour snowfall measured in Harwich between 1940 and 2025 was 4 March 1970, with 11.6 cm.
Are there tropical nights in Harwich?
Almost never: tropical nights (temperature staying above 20 °C) are virtually non-existent in Harwich.
What was the most extreme apparent temperature in Harwich?
In Harwich, between 1940 and 2025, the highest apparent temperature reached 30.6 °C on 25 July 2019, and the lowest was -14.0 °C on 2 February 1956.
Compare Harwich with another city
Pick a second city: its normals will be set against these, indicator by indicator.
Nearby cities
The climate around Harwich