Horncastle climate — normals and trends
Horncastle (United Kingdom) has a temperate oceanic climate (Cfb) under the Köppen-Geiger classification. Its mean annual temperature is 9.7 °C and it receives 650 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 (16.4 °C on average) and the coldest is January (3.8 °C). Rainfall peaks in July.
Horncastle averages 36 frost days, 0 hot days (≥ 30 °C) and 131 rainy days per year.
Horncastle has warmed by +1.5 °C between 1940 and 2025, or +0.18 °C per decade. This trend is statistically significant.
The number of frost days there went from about 53 to 19 per year over the period.
The hottest day of the period reached 37.7 °C (on 19 July 2022) and the coldest -15.4 °C (on 23 January 1963).
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
HorncastleEngland
- coords
- 53.21°, -0.12°
- period
- 1940–2025 · 86 yrs
Mean daily temperature
9.7°C
Average daily high
12.9°C
Average daily low
6.6°C
Annual rainfall
650mm
Sunshine / day
7.6h
Mean relative humidity
80%
Average peak wind
23.9km/h
Seasonal range
12.6°C
Frost days (< 0 °C)
36 d/yr
Hot days (≥ 30 °C)
0 d/yr
Rainy days (≥ 1 mm)
131 d/yr
Annual snowfall
16.5 cm
Average feels-like high
9.8 °C
Average feels-like low
3.2 °C
Average peak gust
43.7 km/h
Tropical nights (≥ 20 °C)
0 d/yr
Solar radiation
10.5 MJ/m²
Has the climate changed?
One stripe per year, 1940 to 2025
+1.5 °C
since 1940
+0.2 °C per decade · r² = 0.42 · 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
37.7 °C
19 July 2022
Coldest day
-15.4 °C
23 January 1963
Wettest day
46 mm
20 October 2023
Windiest day
68.1 km/h
3 January 1976
Strongest gust
129.6 km/h
9 February 2020
Hottest feels-like
34.8 °C
19 July 2022
Coldest feels-like
-20.7 °C
23 January 1963
Snowiest day
15.5 cm
26 April 1981
Sunniest day
16.0 h
3 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 | 5.8 °C | -0.3 °C | 84 mm | +33 mm |
| Feb | 7.4 °C | +0.7 °C | 41 mm | -1 mm |
| Mar | 12.1 °C | +3.0 °C | 12 mm | -35 mm |
| Apr | 14.4 °C | +2.8 °C | 14 mm | -36 mm |
| May | 16.5 °C | +1.8 °C | 22 mm | -36 mm |
| Jun | 22.3 °C | +4.4 °C | 41 mm | -20 mm |
| Jul | 22.4 °C | +2.2 °C | 84 mm | +21 mm |
| Aug | 21.9 °C | +1.8 °C | 23 mm | -40 mm |
| Sep | 18.3 °C | +0.6 °C | 78 mm | +23 mm |
| Oct | 14.0 °C | +0.1 °C | 60 mm | +5 mm |
| Nov | 10.8 °C | +1.4 °C | 113 mm | +58 mm |
| Dec | 9.2 °C | +2.2 °C | 73 mm | +22 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 Horncastle?
Horncastle has a temperate oceanic climate (Köppen Cfb). Over 1940-2025, the average annual temperature is 9.7 °C and it receives 650 mm of precipitation per year.
What is the hottest day ever recorded in Horncastle?
The hottest day measured in Horncastle between 1940 and 2025 was 19 July 2022, reaching 37.7 °C.
What is the coldest day in Horncastle?
The coldest day measured in Horncastle between 1940 and 2025 was 23 January 1963, at -15.4 °C.
Does it snow in Horncastle?
Yes. Horncastle gets on average 16.5 cm of snow per year and has around 36 frost days.
Has the climate of Horncastle warmed?
Yes: Horncastle warmed by +1.5 °C between 1940 and 2025, a statistically significant trend.
What is the wettest day in Horncastle?
The wettest day measured in Horncastle between 1940 and 2025 was 20 October 2023, with 46 mm of rain in 24 hours.
What was the windiest day in Horncastle?
The windiest day measured in Horncastle between 1940 and 2025 was 3 January 1976, with winds reaching 68.1 km/h.
What is the warmest month in Horncastle?
The warmest month in Horncastle is July (16.4 °C on average); the coldest is January (3.8 °C).
How much does it rain in Horncastle?
Horncastle receives on average 650 mm of precipitation per year, spread over about 131 rainy days.
Is it sunny in Horncastle?
Horncastle gets on average 7.6 hours of sunshine per day, roughly 2,774 hours per year over 1940-2025.
What is the biggest single-day snowfall in Horncastle?
The heaviest 24-hour snowfall measured in Horncastle between 1940 and 2025 was 26 April 1981, with 15.5 cm.
Are there tropical nights in Horncastle?
Almost never: tropical nights (temperature staying above 20 °C) are virtually non-existent in Horncastle.
What was the most extreme apparent temperature in Horncastle?
In Horncastle, between 1940 and 2025, the highest apparent temperature reached 34.8 °C on 19 July 2022, and the lowest was -20.7 °C on 23 January 1963.
Compare Horncastle with another city
Pick a second city: its normals will be set against these, indicator by indicator.
Nearby cities
The climate around Horncastle