Gorseinon climate — normals and trends
Gorseinon (United Kingdom) has a temperate oceanic climate (Cfb) under the Köppen-Geiger classification. Its mean annual temperature is 9.8 °C and it receives 1,132 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 (15.6 °C on average) and the coldest is January (4.6 °C). Rainfall peaks in December.
Gorseinon averages 33 frost days, 0 hot days (≥ 30 °C) and 171 rainy days per year.
Gorseinon has warmed by +1.5 °C between 1940 and 2025, or +0.17 °C per decade. This trend is statistically significant.
The number of frost days there went from about 47 to 19 per year over the period.
The hottest day of the period reached 32.5 °C (on 18 July 2022) and the coldest -18.1 °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
GorseinonWales
- coords
- 51.67°, -4.04°
- period
- 1940–2025 · 86 yrs
Mean daily temperature
9.8°C
Average daily high
12.5°C
Average daily low
6.9°C
Annual rainfall
1,132mm
Sunshine / day
8.2h
Mean relative humidity
83%
Average peak wind
22.1km/h
Seasonal range
11.0°C
Frost days (< 0 °C)
33 d/yr
Hot days (≥ 30 °C)
0 d/yr
Rainy days (≥ 1 mm)
171 d/yr
Annual snowfall
11.8 cm
Average feels-like high
9.9 °C
Average feels-like low
3.8 °C
Average peak gust
44.4 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
+1.5 °C
since 1940
+0.2 °C per decade · r² = 0.39 · 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
32.5 °C
18 July 2022
Coldest day
-18.1 °C
21 January 1940
Wettest day
68 mm
20 October 1944
Windiest day
74.1 km/h
30 November 1954
Strongest gust
144.0 km/h
25 January 1990
Hottest feels-like
33.2 °C
29 July 1948
Coldest feels-like
-23.6 °C
21 January 1940
Snowiest day
26.0 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 | 6.9 °C | +0.2 °C | 142 mm | +31 mm |
| Feb | 7.8 °C | +0.8 °C | 102 mm | +16 mm |
| Mar | 11.7 °C | +2.7 °C | 22 mm | -59 mm |
| Apr | 15.1 °C | +3.5 °C | 84 mm | +13 mm |
| May | 17.6 °C | +3.0 °C | 53 mm | -30 mm |
| Jun | 18.4 °C | +1.3 °C | 109 mm | +34 mm |
| Jul | 20.4 °C | +1.7 °C | 52 mm | -29 mm |
| Aug | 20.8 °C | +2.3 °C | 68 mm | -27 mm |
| Sep | 16.4 °C | -0.1 °C | 187 mm | +89 mm |
| Oct | 13.7 °C | +0.4 °C | 139 mm | +21 mm |
| Nov | 11.1 °C | +1.4 °C | 228 mm | +115 mm |
| Dec | 9.2 °C | +1.5 °C | 229 mm | +106 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 Gorseinon?
Gorseinon has a temperate oceanic climate (Köppen Cfb). Over 1940-2025, the average annual temperature is 9.8 °C and it receives 1,132 mm of precipitation per year.
What is the hottest day ever recorded in Gorseinon?
The hottest day measured in Gorseinon between 1940 and 2025 was 18 July 2022, reaching 32.5 °C.
What is the coldest day in Gorseinon?
The coldest day measured in Gorseinon between 1940 and 2025 was 21 January 1940, at -18.1 °C.
Does it snow in Gorseinon?
Yes. Gorseinon gets on average 11.8 cm of snow per year and has around 33 frost days.
Has the climate of Gorseinon warmed?
Yes: Gorseinon warmed by +1.5 °C between 1940 and 2025, a statistically significant trend.
What is the wettest day in Gorseinon?
The wettest day measured in Gorseinon between 1940 and 2025 was 20 October 1944, with 68 mm of rain in 24 hours.
What was the windiest day in Gorseinon?
The windiest day measured in Gorseinon between 1940 and 2025 was 30 November 1954, with winds reaching 74.1 km/h.
What is the warmest month in Gorseinon?
The warmest month in Gorseinon is July (15.6 °C on average); the coldest is January (4.6 °C).
How much does it rain in Gorseinon?
Gorseinon receives on average 1,132 mm of precipitation per year, spread over about 171 rainy days.
Is it sunny in Gorseinon?
Gorseinon 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 Gorseinon?
The heaviest 24-hour snowfall measured in Gorseinon between 1940 and 2025 was 8 January 1982, with 26.0 cm.
Are there tropical nights in Gorseinon?
Almost never: tropical nights (temperature staying above 20 °C) are virtually non-existent in Gorseinon.
What was the most extreme apparent temperature in Gorseinon?
In Gorseinon, between 1940 and 2025, the highest apparent temperature reached 33.2 °C on 29 July 1948, and the lowest was -23.6 °C on 21 January 1940.
Compare Gorseinon with another city
Pick a second city: its normals will be set against these, indicator by indicator.
Nearby cities
The climate around Gorseinon