Longwy climate — normals and trends
Longwy (France) has a temperate oceanic climate (Cfb) under the Köppen-Geiger classification. Its mean annual temperature is 9.3 °C and it receives 871 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 (17.6 °C on average) and the coldest is January (1.0 °C). Rainfall peaks in December.
Longwy averages 64 frost days, 3 hot days (≥ 30 °C) and 147 rainy days per year.
Longwy 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 78 to 50 per year over the period.
The hottest day of the period reached 38.0 °C (on 25 July 2019) and the coldest -18.2 °C (on 22 January 1942).
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
LongwyGrand Est
- coords
- 49.52°, 5.76°
- period
- 1940–2025 · 86 yrs
Mean daily temperature
9.3°C
Average daily high
12.8°C
Average daily low
6.0°C
Annual rainfall
871mm
Sunshine / day
7.5h
Mean relative humidity
80%
Average peak wind
18.5km/h
Seasonal range
16.6°C
Frost days (< 0 °C)
64 d/yr
Hot days (≥ 30 °C)
3 d/yr
Rainy days (≥ 1 mm)
147 d/yr
Annual snowfall
37.5 cm
Average feels-like high
10.3 °C
Average feels-like low
3.0 °C
Average peak gust
36.9 km/h
Tropical nights (≥ 20 °C)
1 d/yr
Solar radiation
11.2 MJ/m²
Has the climate changed?
One stripe per year, 1940 to 2025
+1.8 °C
since 1940
+0.2 °C per decade · r² = 0.40 · 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
38.0 °C
25 July 2019
Coldest day
-18.2 °C
22 January 1942
Wettest day
63 mm
11 May 1970
Windiest day
55.6 km/h
3 February 1990
Strongest gust
123.8 km/h
24 November 1984
Hottest feels-like
38.2 °C
24 July 2019
Coldest feels-like
-24.9 °C
6 January 1947
Snowiest day
13.0 cm
7 January 1968
Sunniest day
15.3 h
28 June 1995
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 | 5.1 °C | +2.0 °C | 131 mm | +56 mm |
| Feb | 5.8 °C | +1.1 °C | 47 mm | -20 mm |
| Mar | 12.9 °C | +4.0 °C | 16 mm | -54 mm |
| Apr | 16.5 °C | +3.7 °C | 60 mm | -5 mm |
| May | 19.2 °C | +2.4 °C | 39 mm | -39 mm |
| Jun | 24.6 °C | +4.6 °C | 65 mm | -10 mm |
| Jul | 23.5 °C | +1.5 °C | 112 mm | +43 mm |
| Aug | 24.5 °C | +2.8 °C | 44 mm | -28 mm |
| Sep | 18.5 °C | +0.2 °C | 167 mm | +99 mm |
| Oct | 13.7 °C | +0.5 °C | 100 mm | +29 mm |
| Nov | 9.3 °C | +2.0 °C | 67 mm | -11 mm |
| Dec | 7.1 °C | +2.9 °C | 39 mm | -45 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 Longwy?
Longwy has a temperate oceanic climate (Köppen Cfb). Over 1940-2025, the average annual temperature is 9.3 °C and it receives 871 mm of precipitation per year.
What is the hottest day ever recorded in Longwy?
The hottest day measured in Longwy between 1940 and 2025 was 25 July 2019, reaching 38.0 °C.
What is the coldest day in Longwy?
The coldest day measured in Longwy between 1940 and 2025 was 22 January 1942, at -18.2 °C.
Does it snow in Longwy?
Yes. Longwy gets on average 37.5 cm of snow per year and has around 64 frost days.
Has the climate of Longwy warmed?
Yes: Longwy warmed by +1.8 °C between 1940 and 2025, a statistically significant trend.
What is the wettest day in Longwy?
The wettest day measured in Longwy between 1940 and 2025 was 11 May 1970, with 63 mm of rain in 24 hours.
What was the windiest day in Longwy?
The windiest day measured in Longwy between 1940 and 2025 was 3 February 1990, with winds reaching 55.6 km/h.
What is the warmest month in Longwy?
The warmest month in Longwy is July (17.6 °C on average); the coldest is January (1.0 °C).
How much does it rain in Longwy?
Longwy receives on average 871 mm of precipitation per year, spread over about 147 rainy days.
Is it sunny in Longwy?
Longwy 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 Longwy?
The heaviest 24-hour snowfall measured in Longwy between 1940 and 2025 was 7 January 1968, with 13.0 cm.
Are there tropical nights in Longwy?
Yes: Longwy has on average 1 tropical nights per year (temperature staying above 20 °C), over 1940-2025.
What was the most extreme apparent temperature in Longwy?
In Longwy, between 1940 and 2025, the highest apparent temperature reached 38.2 °C on 24 July 2019, and the lowest was -24.9 °C on 6 January 1947.
Compare Longwy with another city
Pick a second city: its normals will be set against these, indicator by indicator.
Nearby cities
The climate around Longwy