Saint-Lô climate — normals and trends
Saint-Lô (France) has a temperate oceanic climate (Cfb) under the Köppen-Geiger classification. Its mean annual temperature is 10.6 °C and it receives 847 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 (17.1 °C on average) and the coldest is January (4.5 °C). Rainfall peaks in December.
Saint-Lô averages 31 frost days, 2 hot days (≥ 30 °C) and 149 rainy days per year.
Saint-Lô 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 42 to 20 per year over the period.
The hottest day of the period reached 38.5 °C (on 18 July 2022) and the coldest -14.8 °C (on 17 January 1985).
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
Saint-LôNormandy
- coords
- 49.12°, -1.09°
- period
- 1940–2025 · 86 yrs
Mean daily temperature
10.6°C
Average daily high
14.0°C
Average daily low
7.5°C
Annual rainfall
847mm
Sunshine / day
8.4h
Mean relative humidity
82%
Average peak wind
18.6km/h
Seasonal range
12.6°C
Frost days (< 0 °C)
31 d/yr
Hot days (≥ 30 °C)
2 d/yr
Rainy days (≥ 1 mm)
149 d/yr
Annual snowfall
11.5 cm
Average feels-like high
11.8 °C
Average feels-like low
4.8 °C
Average peak gust
40.3 km/h
Tropical nights (≥ 20 °C)
0 d/yr
Solar radiation
12.0 MJ/m²
Has the climate changed?
One stripe per year, 1940 to 2025
+1.5 °C
since 1940
+0.2 °C per decade · r² = 0.38 · 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
38.5 °C
18 July 2022
Coldest day
-14.8 °C
17 January 1985
Wettest day
51 mm
13 November 2010
Windiest day
58.3 km/h
16 October 1987
Strongest gust
124.2 km/h
24 December 2013
Hottest feels-like
39.5 °C
9 August 2003
Coldest feels-like
-20.5 °C
17 January 1985
Snowiest day
16.5 cm
11 March 2013
Sunniest day
15.9 h
21 June 2025
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 | 182 mm | +102 mm |
| Feb | 8.7 °C | +1.0 °C | 49 mm | -20 mm |
| Mar | 12.5 °C | +2.0 °C | 31 mm | -37 mm |
| Apr | 16.8 °C | +3.7 °C | 46 mm | -19 mm |
| May | 18.0 °C | +1.7 °C | 56 mm | -20 mm |
| Jun | 22.8 °C | +3.5 °C | 38 mm | -24 mm |
| Jul | 22.3 °C | +1.2 °C | 113 mm | +55 mm |
| Aug | 23.0 °C | +2.0 °C | 37 mm | -24 mm |
| Sep | 18.8 °C | 0.0 °C | 76 mm | +12 mm |
| Oct | 15.6 °C | +0.6 °C | 99 mm | +22 mm |
| Nov | 12.1 °C | +1.8 °C | 71 mm | -13 mm |
| Dec | 8.9 °C | +1.3 °C | 73 mm | -13 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 Saint-Lô?
Saint-Lô has a temperate oceanic climate (Köppen Cfb). Over 1940-2025, the average annual temperature is 10.6 °C and it receives 847 mm of precipitation per year.
What is the hottest day ever recorded in Saint-Lô?
The hottest day measured in Saint-Lô between 1940 and 2025 was 18 July 2022, reaching 38.5 °C.
What is the coldest day in Saint-Lô?
The coldest day measured in Saint-Lô between 1940 and 2025 was 17 January 1985, at -14.8 °C.
Does it snow in Saint-Lô?
Yes. Saint-Lô gets on average 11.5 cm of snow per year and has around 31 frost days.
Has the climate of Saint-Lô warmed?
Yes: Saint-Lô warmed by +1.5 °C between 1940 and 2025, a statistically significant trend.
What is the wettest day in Saint-Lô?
The wettest day measured in Saint-Lô between 1940 and 2025 was 13 November 2010, with 51 mm of rain in 24 hours.
What was the windiest day in Saint-Lô?
The windiest day measured in Saint-Lô between 1940 and 2025 was 16 October 1987, with winds reaching 58.3 km/h.
What is the warmest month in Saint-Lô?
The warmest month in Saint-Lô is July (17.1 °C on average); the coldest is January (4.5 °C).
How much does it rain in Saint-Lô?
Saint-Lô receives on average 847 mm of precipitation per year, spread over about 149 rainy days.
Is it sunny in Saint-Lô?
Saint-Lô gets on average 8.4 hours of sunshine per day, roughly 3,066 hours per year over 1940-2025.
What is the biggest single-day snowfall in Saint-Lô?
The heaviest 24-hour snowfall measured in Saint-Lô between 1940 and 2025 was 11 March 2013, with 16.5 cm.
Are there tropical nights in Saint-Lô?
Almost never: tropical nights (temperature staying above 20 °C) are virtually non-existent in Saint-Lô.
What was the most extreme apparent temperature in Saint-Lô?
In Saint-Lô, between 1940 and 2025, the highest apparent temperature reached 39.5 °C on 9 August 2003, and the lowest was -20.5 °C on 17 January 1985.
Compare Saint-Lô with another city
Pick a second city: its normals will be set against these, indicator by indicator.
Nearby cities
The climate around Saint-Lô