Blois climate — normals and trends
Blois (France) has a temperate oceanic climate (Cfb) under the Köppen-Geiger classification. Its mean annual temperature is 11.6 °C and it receives 677 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 (19.7 °C on average) and the coldest is January (4.0 °C). Rainfall peaks in May.
Blois averages 39 frost days, 10 hot days (≥ 30 °C) and 125 rainy days per year.
Blois has warmed by +1.8 °C between 1940 and 2025, or +0.21 °C per decade. This trend is statistically significant.
The number of frost days there went from about 50 to 28 per year over the period.
The hottest day of the period reached 40.8 °C (on 25 July 2019) and the coldest -18.9 °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
BloisCentre-Val de Loire
- coords
- 47.59°, 1.33°
- period
- 1940–2025 · 86 yrs
Mean daily temperature
11.6°C
Average daily high
15.6°C
Average daily low
7.7°C
Annual rainfall
677mm
Sunshine / day
8.1h
Mean relative humidity
77%
Average peak wind
18.2km/h
Seasonal range
15.7°C
Frost days (< 0 °C)
39 d/yr
Hot days (≥ 30 °C)
10 d/yr
Rainy days (≥ 1 mm)
125 d/yr
Annual snowfall
10.2 cm
Average feels-like high
13.4 °C
Average feels-like low
5.2 °C
Average peak gust
36.1 km/h
Tropical nights (≥ 20 °C)
2 d/yr
Solar radiation
12.1 MJ/m²
Has the climate changed?
One stripe per year, 1940 to 2025
+1.8 °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
40.8 °C
25 July 2019
Coldest day
-18.9 °C
17 January 1985
Wettest day
56 mm
7 August 1965
Windiest day
61.4 km/h
3 February 1990
Strongest gust
130.7 km/h
26 December 1999
Hottest feels-like
42.0 °C
30 July 2024
Coldest feels-like
-24.0 °C
17 January 1985
Snowiest day
10.4 cm
4 March 2006
Sunniest day
15.8 h
24 June 1947
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 | 7.4 °C | +0.8 °C | 120 mm | +62 mm |
| Feb | 9.3 °C | +1.1 °C | 53 mm | -2 mm |
| Mar | 13.5 °C | +1.7 °C | 55 mm | +0 mm |
| Apr | 18.5 °C | +3.6 °C | 48 mm | -7 mm |
| May | 21.1 °C | +2.5 °C | 34 mm | -35 mm |
| Jun | 28.0 °C | +5.7 °C | 15 mm | -36 mm |
| Jul | 26.6 °C | +2.0 °C | 49 mm | +2 mm |
| Aug | 27.1 °C | +2.7 °C | 54 mm | +6 mm |
| Sep | 20.5 °C | -0.8 °C | 55 mm | +4 mm |
| Oct | 17.1 °C | +0.7 °C | 62 mm | -1 mm |
| Nov | 12.3 °C | +1.8 °C | 69 mm | +6 mm |
| Dec | 9.2 °C | +1.8 °C | 46 mm | -16 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 Blois?
Blois has a temperate oceanic climate (Köppen Cfb). Over 1940-2025, the average annual temperature is 11.6 °C and it receives 677 mm of precipitation per year.
What is the hottest day ever recorded in Blois?
The hottest day measured in Blois between 1940 and 2025 was 25 July 2019, reaching 40.8 °C.
What is the coldest day in Blois?
The coldest day measured in Blois between 1940 and 2025 was 17 January 1985, at -18.9 °C.
Does it snow in Blois?
Yes. Blois gets on average 10.2 cm of snow per year and has around 39 frost days.
Has the climate of Blois warmed?
Yes: Blois warmed by +1.8 °C between 1940 and 2025, a statistically significant trend.
What is the wettest day in Blois?
The wettest day measured in Blois between 1940 and 2025 was 7 August 1965, with 56 mm of rain in 24 hours.
What was the windiest day in Blois?
The windiest day measured in Blois between 1940 and 2025 was 3 February 1990, with winds reaching 61.4 km/h.
What is the warmest month in Blois?
The warmest month in Blois is July (19.7 °C on average); the coldest is January (4.0 °C).
How much does it rain in Blois?
Blois receives on average 677 mm of precipitation per year, spread over about 125 rainy days.
Is it sunny in Blois?
Blois gets on average 8.1 hours of sunshine per day, roughly 2,957 hours per year over 1940-2025.
What is the biggest single-day snowfall in Blois?
The heaviest 24-hour snowfall measured in Blois between 1940 and 2025 was 4 March 2006, with 10.4 cm.
Are there tropical nights in Blois?
Yes: Blois has on average 2 tropical nights per year (temperature staying above 20 °C), over 1940-2025.
What was the most extreme apparent temperature in Blois?
In Blois, between 1940 and 2025, the highest apparent temperature reached 42.0 °C on 30 July 2024, and the lowest was -24.0 °C on 17 January 1985.
Compare Blois with another city
Pick a second city: its normals will be set against these, indicator by indicator.
Nearby cities
The climate around Blois