Undy climate — normals and trends
Undy (United Kingdom) has a temperate oceanic climate (Cfb) under the Köppen-Geiger classification. Its mean annual temperature is 10.1 °C and it receives 755 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 October.
Undy averages 36 frost days, 1 hot days (≥ 30 °C) and 134 rainy days per year.
Undy has warmed by +1.6 °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 51 to 21 per year over the period.
The hottest day of the period reached 35.6 °C (on 18 July 2022) and the coldest -20.4 °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
UndyWales
- coords
- 51.58°, -2.81°
- period
- 1940–2025 · 86 yrs
Mean daily temperature
10.1°C
Average daily high
13.4°C
Average daily low
6.9°C
Annual rainfall
755mm
Sunshine / day
7.5h
Mean relative humidity
82%
Average peak wind
20.9km/h
Seasonal range
12.2°C
Frost days (< 0 °C)
36 d/yr
Hot days (≥ 30 °C)
1 d/yr
Rainy days (≥ 1 mm)
134 d/yr
Annual snowfall
12.2 cm
Average feels-like high
10.7 °C
Average feels-like low
4.0 °C
Average peak gust
40.8 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
+1.6 °C
since 1940
+0.2 °C per decade · r² = 0.43 · 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
35.6 °C
18 July 2022
Coldest day
-20.4 °C
21 January 1940
Wettest day
48 mm
27 December 1979
Windiest day
66.9 km/h
25 January 1990
Strongest gust
133.2 km/h
25 January 1990
Hottest feels-like
36.2 °C
29 July 1948
Coldest feels-like
-25.9 °C
21 January 1940
Snowiest day
19.8 cm
8 January 1982
Sunniest day
16.0 h
6 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 | 7.1 °C | +0.3 °C | 98 mm | +29 mm |
| Feb | 8.0 °C | +0.7 °C | 69 mm | +14 mm |
| Mar | 12.5 °C | +2.8 °C | 14 mm | -45 mm |
| Apr | 16.4 °C | +3.9 °C | 47 mm | -9 mm |
| May | 18.9 °C | +3.2 °C | 31 mm | -37 mm |
| Jun | 20.8 °C | +2.2 °C | 60 mm | +3 mm |
| Jul | 23.3 °C | +2.9 °C | 46 mm | -9 mm |
| Aug | 22.5 °C | +2.5 °C | 28 mm | -35 mm |
| Sep | 17.5 °C | -0.2 °C | 86 mm | +24 mm |
| Oct | 14.4 °C | +0.4 °C | 72 mm | +1 mm |
| Nov | 11.6 °C | +1.7 °C | 143 mm | +73 mm |
| Dec | 9.6 °C | +1.9 °C | 132 mm | +61 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 Undy?
Undy has a temperate oceanic climate (Köppen Cfb). Over 1940-2025, the average annual temperature is 10.1 °C and it receives 755 mm of precipitation per year.
What is the hottest day ever recorded in Undy?
The hottest day measured in Undy between 1940 and 2025 was 18 July 2022, reaching 35.6 °C.
What is the coldest day in Undy?
The coldest day measured in Undy between 1940 and 2025 was 21 January 1940, at -20.4 °C.
Does it snow in Undy?
Yes. Undy gets on average 12.2 cm of snow per year and has around 36 frost days.
Has the climate of Undy warmed?
Yes: Undy warmed by +1.6 °C between 1940 and 2025, a statistically significant trend.
What is the wettest day in Undy?
The wettest day measured in Undy between 1940 and 2025 was 27 December 1979, with 48 mm of rain in 24 hours.
What was the windiest day in Undy?
The windiest day measured in Undy between 1940 and 2025 was 25 January 1990, with winds reaching 66.9 km/h.
What is the warmest month in Undy?
The warmest month in Undy is July (16.6 °C on average); the coldest is January (4.4 °C).
How much does it rain in Undy?
Undy receives on average 755 mm of precipitation per year, spread over about 134 rainy days.
Is it sunny in Undy?
Undy 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 Undy?
The heaviest 24-hour snowfall measured in Undy between 1940 and 2025 was 8 January 1982, with 19.8 cm.
Are there tropical nights in Undy?
Almost never: tropical nights (temperature staying above 20 °C) are virtually non-existent in Undy.
What was the most extreme apparent temperature in Undy?
In Undy, between 1940 and 2025, the highest apparent temperature reached 36.2 °C on 29 July 1948, and the lowest was -25.9 °C on 21 January 1940.
Compare Undy with another city
Pick a second city: its normals will be set against these, indicator by indicator.
Nearby cities
The climate around Undy