Helston climate — normals and trends
Helston (United Kingdom) has a temperate oceanic climate (Cfb) under the Köppen-Geiger classification. Its mean annual temperature is 11.6 °C and it receives 807 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 (16.5 °C on average) and the coldest is February (7.5 °C). Rainfall peaks in December.
Helston averages 2 frost days, 0 hot days (≥ 30 °C) and 142 rainy days per year.
Helston has warmed by +1.0 °C between 1940 and 2025, or +0.12 °C per decade. This trend is statistically significant.
The number of frost days there went from about 4 to 0 per year over the period.
The hottest day of the period reached 25.6 °C (on 18 July 2022) and the coldest -5.2 °C (on 13 January 1987).
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
HelstonEngland
- coords
- 50.10°, -5.27°
- period
- 1940–2025 · 86 yrs
Mean daily temperature
11.6°C
Average daily high
13.0°C
Average daily low
10.1°C
Annual rainfall
807mm
Sunshine / day
8.3h
Mean relative humidity
81%
Average peak wind
30.7km/h
Seasonal range
9.0°C
Frost days (< 0 °C)
2 d/yr
Hot days (≥ 30 °C)
0 d/yr
Rainy days (≥ 1 mm)
142 d/yr
Annual snowfall
2.2 cm
Average feels-like high
9.9 °C
Average feels-like low
6.1 °C
Average peak gust
45.7 km/h
Tropical nights (≥ 20 °C)
0 d/yr
Solar radiation
11.4 MJ/m²
Has the climate changed?
One stripe per year, 1940 to 2025
+1.0 °C
since 1940
+0.1 °C per decade · r² = 0.30 · 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
25.6 °C
18 July 2022
Coldest day
-5.2 °C
13 January 1987
Wettest day
54 mm
16 July 2009
Windiest day
83.4 km/h
25 January 1990
Strongest gust
139.0 km/h
4 January 1998
Hottest feels-like
28.2 °C
27 June 1976
Coldest feels-like
-14.5 °C
12 January 1987
Snowiest day
8.9 cm
30 December 1962
Sunniest day
15.5 h
22 June 2022
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 | 9.8 °C | +0.6 °C | 150 mm | +64 mm |
| Feb | 9.9 °C | +1.1 °C | 81 mm | +11 mm |
| Mar | 10.8 °C | +1.1 °C | 26 mm | -40 mm |
| Apr | 12.9 °C | +1.9 °C | 94 mm | +42 mm |
| May | 15.6 °C | +2.2 °C | 27 mm | -29 mm |
| Jun | 17.5 °C | +1.6 °C | 50 mm | +1 mm |
| Jul | 19.5 °C | +1.7 °C | 28 mm | -21 mm |
| Aug | 19.5 °C | +1.5 °C | 58 mm | +2 mm |
| Sep | 16.4 °C | -0.2 °C | 107 mm | +46 mm |
| Oct | 14.7 °C | +0.5 °C | 87 mm | +4 mm |
| Nov | 12.9 °C | +1.3 °C | 124 mm | +34 mm |
| Dec | 11.2 °C | +1.0 °C | 192 mm | +101 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 Helston?
Helston has a temperate oceanic climate (Köppen Cfb). Over 1940-2025, the average annual temperature is 11.6 °C and it receives 807 mm of precipitation per year.
What is the hottest day ever recorded in Helston?
The hottest day measured in Helston between 1940 and 2025 was 18 July 2022, reaching 25.6 °C.
What is the coldest day in Helston?
The coldest day measured in Helston between 1940 and 2025 was 13 January 1987, at -5.2 °C.
Does it snow in Helston?
Yes. Helston gets on average 2.2 cm of snow per year and has around 2 frost days.
Has the climate of Helston warmed?
Yes: Helston warmed by +1.0 °C between 1940 and 2025, a statistically significant trend.
What is the wettest day in Helston?
The wettest day measured in Helston between 1940 and 2025 was 16 July 2009, with 54 mm of rain in 24 hours.
What was the windiest day in Helston?
The windiest day measured in Helston between 1940 and 2025 was 25 January 1990, with winds reaching 83.4 km/h.
What is the warmest month in Helston?
The warmest month in Helston is August (16.5 °C on average); the coldest is February (7.5 °C).
How much does it rain in Helston?
Helston receives on average 807 mm of precipitation per year, spread over about 142 rainy days.
Is it sunny in Helston?
Helston 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 Helston?
The heaviest 24-hour snowfall measured in Helston between 1940 and 2025 was 30 December 1962, with 8.9 cm.
Are there tropical nights in Helston?
Almost never: tropical nights (temperature staying above 20 °C) are virtually non-existent in Helston.
What was the most extreme apparent temperature in Helston?
In Helston, between 1940 and 2025, the highest apparent temperature reached 28.2 °C on 27 June 1976, and the lowest was -14.5 °C on 12 January 1987.
Compare Helston with another city
Pick a second city: its normals will be set against these, indicator by indicator.
Nearby cities
The climate around Helston