Keynsham climate — normals and trends
Keynsham (United Kingdom) has a temperate oceanic climate (Cfb) under the Köppen-Geiger classification. Its mean annual temperature is 10.1 °C and it receives 730 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 (16.6 °C on average) and the coldest is January (4.4 °C). Rainfall peaks in May.
Keynsham averages 37 frost days, 0 hot days (≥ 30 °C) and 132 rainy days per year.
Keynsham 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 52 to 22 per year over the period.
The hottest day of the period reached 34.9 °C (on 18 July 2022) and the coldest -21.3 °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
KeynshamEngland
- coords
- 51.41°, -2.50°
- period
- 1940–2025 · 86 yrs
Mean daily temperature
10.1°C
Average daily high
13.3°C
Average daily low
6.8°C
Annual rainfall
730mm
Sunshine / day
7.5h
Mean relative humidity
82%
Average peak wind
20.9km/h
Seasonal range
12.2°C
Frost days (< 0 °C)
37 d/yr
Hot days (≥ 30 °C)
0 d/yr
Rainy days (≥ 1 mm)
132 d/yr
Annual snowfall
11.8 cm
Average feels-like high
10.7 °C
Average feels-like low
4.0 °C
Average peak gust
40.6 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 = 0.45 · 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
34.9 °C
18 July 2022
Coldest day
-21.3 °C
21 January 1940
Wettest day
47 mm
27 December 1979
Windiest day
65.9 km/h
25 January 1990
Strongest gust
132.5 km/h
25 January 1990
Hottest feels-like
35.9 °C
29 July 1948
Coldest feels-like
-26.5 °C
21 January 1940
Snowiest day
17.4 cm
8 January 1982
Sunniest day
16.0 h
5 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 | 6.9 °C | +0.2 °C | 92 mm | +28 mm |
| Feb | 8.0 °C | +0.7 °C | 62 mm | +11 mm |
| Mar | 12.5 °C | +2.8 °C | 19 mm | -38 mm |
| Apr | 16.4 °C | +4.0 °C | 38 mm | -18 mm |
| May | 18.7 °C | +3.1 °C | 30 mm | -39 mm |
| Jun | 21.1 °C | +2.6 °C | 53 mm | -5 mm |
| Jul | 23.4 °C | +3.1 °C | 48 mm | -8 mm |
| Aug | 22.5 °C | +2.5 °C | 28 mm | -35 mm |
| Sep | 17.6 °C | -0.1 °C | 82 mm | +23 mm |
| Oct | 14.4 °C | +0.4 °C | 75 mm | +7 mm |
| Nov | 11.6 °C | +1.8 °C | 124 mm | +58 mm |
| Dec | 9.6 °C | +2.0 °C | 117 mm | +52 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 Keynsham?
Keynsham has a temperate oceanic climate (Köppen Cfb). Over 1940-2025, the average annual temperature is 10.1 °C and it receives 730 mm of precipitation per year.
What is the hottest day ever recorded in Keynsham?
The hottest day measured in Keynsham between 1940 and 2025 was 18 July 2022, reaching 34.9 °C.
What is the coldest day in Keynsham?
The coldest day measured in Keynsham between 1940 and 2025 was 21 January 1940, at -21.3 °C.
Does it snow in Keynsham?
Yes. Keynsham gets on average 11.8 cm of snow per year and has around 37 frost days.
Has the climate of Keynsham warmed?
Yes: Keynsham warmed by +1.7 °C between 1940 and 2025, a statistically significant trend.
What is the wettest day in Keynsham?
The wettest day measured in Keynsham between 1940 and 2025 was 27 December 1979, with 47 mm of rain in 24 hours.
What was the windiest day in Keynsham?
The windiest day measured in Keynsham between 1940 and 2025 was 25 January 1990, with winds reaching 65.9 km/h.
What is the warmest month in Keynsham?
The warmest month in Keynsham is July (16.6 °C on average); the coldest is January (4.4 °C).
How much does it rain in Keynsham?
Keynsham receives on average 730 mm of precipitation per year, spread over about 132 rainy days.
Is it sunny in Keynsham?
Keynsham gets on average 7.5 hours of sunshine per day, roughly 2,738 hours per year over 1940-2025.
What is the biggest single-day snowfall in Keynsham?
The heaviest 24-hour snowfall measured in Keynsham between 1940 and 2025 was 8 January 1982, with 17.4 cm.
Are there tropical nights in Keynsham?
Almost never: tropical nights (temperature staying above 20 °C) are virtually non-existent in Keynsham.
What was the most extreme apparent temperature in Keynsham?
In Keynsham, between 1940 and 2025, the highest apparent temperature reached 35.9 °C on 29 July 1948, and the lowest was -26.5 °C on 21 January 1940.
Compare Keynsham with another city
Pick a second city: its normals will be set against these, indicator by indicator.
Nearby cities
The climate around Keynsham