Chepstow climate — normals and trends
Chepstow (United Kingdom) has a temperate oceanic climate (Cfb) under the Köppen-Geiger classification. Its mean annual temperature is 9.9 °C and it receives 718 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 (16.5 °C on average) and the coldest is January (4.2 °C). Rainfall peaks in October.
Chepstow averages 39 frost days, 0 hot days (≥ 30 °C) and 131 rainy days per year.
Chepstow 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 54 to 24 per year over the period.
The hottest day of the period reached 35.5 °C (on 18 July 2022) and the coldest -22.0 °C (on 21 January 1940).
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
ChepstowWales
- coords
- 51.64°, -2.68°
- period
- 1940–2025 · 86 yrs
Mean daily temperature
9.9°C
Average daily high
13.2°C
Average daily low
6.6°C
Annual rainfall
718mm
Sunshine / day
7.4h
Mean relative humidity
81%
Average peak wind
20.5km/h
Seasonal range
12.3°C
Frost days (< 0 °C)
39 d/yr
Hot days (≥ 30 °C)
0 d/yr
Rainy days (≥ 1 mm)
131 d/yr
Annual snowfall
15.6 cm
Average feels-like high
10.5 °C
Average feels-like low
3.8 °C
Average peak gust
40.7 km/h
Tropical nights (≥ 20 °C)
0 d/yr
Solar radiation
10.3 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
35.5 °C
18 July 2022
Coldest day
-22.0 °C
21 January 1940
Wettest day
54 mm
14 November 2025
Windiest day
59.1 km/h
11 January 1962
Strongest gust
122.0 km/h
25 January 1990
Hottest feels-like
35.5 °C
29 July 1948
Coldest feels-like
-27.4 °C
21 January 1940
Snowiest day
25.1 cm
8 January 1982
Sunniest day
16.0 h
25 June 2023
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 | 6.8 °C | +0.2 °C | 93 mm | +29 mm |
| Feb | 7.9 °C | +0.8 °C | 64 mm | +12 mm |
| Mar | 12.4 °C | +2.9 °C | 14 mm | -42 mm |
| Apr | 16.1 °C | +3.8 °C | 48 mm | -6 mm |
| May | 18.5 °C | +3.0 °C | 26 mm | -40 mm |
| Jun | 21.0 °C | +2.5 °C | 52 mm | -3 mm |
| Jul | 23.3 °C | +3.0 °C | 47 mm | -6 mm |
| Aug | 22.4 °C | +2.5 °C | 21 mm | -38 mm |
| Sep | 17.6 °C | 0.0 °C | 74 mm | +15 mm |
| Oct | 14.2 °C | +0.4 °C | 67 mm | -2 mm |
| Nov | 11.4 °C | +1.7 °C | 147 mm | +81 mm |
| Dec | 9.4 °C | +1.9 °C | 130 mm | +64 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 Chepstow?
Chepstow has a temperate oceanic climate (Köppen Cfb). Over 1940-2025, the average annual temperature is 9.9 °C and it receives 718 mm of precipitation per year.
What is the hottest day ever recorded in Chepstow?
The hottest day measured in Chepstow between 1940 and 2025 was 18 July 2022, reaching 35.5 °C.
What is the coldest day in Chepstow?
The coldest day measured in Chepstow between 1940 and 2025 was 21 January 1940, at -22.0 °C.
Does it snow in Chepstow?
Yes. Chepstow gets on average 15.6 cm of snow per year and has around 39 frost days.
Has the climate of Chepstow warmed?
Yes: Chepstow warmed by +1.7 °C between 1940 and 2025, a statistically significant trend.
What is the wettest day in Chepstow?
The wettest day measured in Chepstow between 1940 and 2025 was 14 November 2025, with 54 mm of rain in 24 hours.
What was the windiest day in Chepstow?
The windiest day measured in Chepstow between 1940 and 2025 was 11 January 1962, with winds reaching 59.1 km/h.
What is the warmest month in Chepstow?
The warmest month in Chepstow is July (16.5 °C on average); the coldest is January (4.2 °C).
How much does it rain in Chepstow?
Chepstow receives on average 718 mm of precipitation per year, spread over about 131 rainy days.
Is it sunny in Chepstow?
Chepstow gets on average 7.4 hours of sunshine per day, roughly 2,701 hours per year over 1940-2025.
What is the biggest single-day snowfall in Chepstow?
The heaviest 24-hour snowfall measured in Chepstow between 1940 and 2025 was 8 January 1982, with 25.1 cm.
Are there tropical nights in Chepstow?
Almost never: tropical nights (temperature staying above 20 °C) are virtually non-existent in Chepstow.
What was the most extreme apparent temperature in Chepstow?
In Chepstow, between 1940 and 2025, the highest apparent temperature reached 35.5 °C on 29 July 1948, and the lowest was -27.4 °C on 21 January 1940.
Compare Chepstow with another city
Pick a second city: its normals will be set against these, indicator by indicator.
Nearby cities
The climate around Chepstow