Rosso climate — normals and trends
Rosso (Mauritania) has a hot desert climate (BWh) under the Köppen-Geiger classification. Its mean annual temperature is 27.9 °C and it receives 179 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 October (30.4 °C on average) and the coldest is January (23.7 °C). Rainfall peaks in August.
Rosso averages 0 frost days, 330 hot days (≥ 30 °C) and 25 rainy days per year.
Rosso has warmed by +1.7 °C between 1940 and 2025, or +0.20 °C per decade. This trend is statistically significant.
The hottest day of the period reached 46.9 °C (on 19 June 2010) and the coldest 10.7 °C (on 8 January 1965).
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
RossoTrarza
- coords
- 16.51°, -15.81°
- period
- 1940–2025 · 86 yrs
Mean daily temperature
27.9°C
Average daily high
35.0°C
Average daily low
22.1°C
Annual rainfall
179mm
Sunshine / day
11.1h
Mean relative humidity
45%
Average peak wind
22.5km/h
Seasonal range
6.7°C
Frost days (< 0 °C)
0 d/yr
Hot days (≥ 30 °C)
330 d/yr
Rainy days (≥ 1 mm)
25 d/yr
Annual snowfall
0.0 cm
Average feels-like high
34.8 °C
Average feels-like low
21.6 °C
Average peak gust
38.7 km/h
Tropical nights (≥ 20 °C)
257 d/yr
Solar radiation
22.8 MJ/m²
Has the climate changed?
One stripe per year, 1940 to 2025
+1.7 °C
since 1940
+0.2 °C per decade · r² = 0.55 · 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
46.9 °C
19 June 2010
Coldest day
10.7 °C
8 January 1965
Wettest day
111 mm
16 August 2010
Windiest day
52.1 km/h
16 August 1987
Strongest gust
82.1 km/h
16 August 1987
Hottest feels-like
47.9 °C
24 June 1998
Coldest feels-like
5.3 °C
3 January 1943
Sunniest day
12.2 h
6 July 1949
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 | 32.4 °C | +1.7 °C | 0 mm | -2 mm |
| Feb | 33.1 °C | +0.3 °C | 0 mm | -2 mm |
| Mar | 34.0 °C | -1.1 °C | 0 mm | 0 mm |
| Apr | 37.8 °C | +0.9 °C | 0 mm | 0 mm |
| May | 40.0 °C | +1.5 °C | 0 mm | -0 mm |
| Jun | 37.1 °C | -0.8 °C | 0 mm | -2 mm |
| Jul | 34.9 °C | -0.4 °C | 4 mm | -14 mm |
| Aug | 33.7 °C | -0.5 °C | 162 mm | +92 mm |
| Sep | 34.8 °C | -0.1 °C | 53 mm | -9 mm |
| Oct | 38.1 °C | +0.9 °C | 12 mm | -6 mm |
| Nov | 35.9 °C | +0.6 °C | 2 mm | +1 mm |
| Dec | 30.0 °C | -1.4 °C | 8 mm | +6 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 Rosso?
Rosso has a hot desert climate (Köppen BWh). Over 1940-2025, the average annual temperature is 27.9 °C and it receives 179 mm of precipitation per year.
What is the hottest day ever recorded in Rosso?
The hottest day measured in Rosso between 1940 and 2025 was 19 June 2010, reaching 46.9 °C.
What is the coldest day in Rosso?
The coldest day measured in Rosso between 1940 and 2025 was 8 January 1965, at 10.7 °C.
Does it snow in Rosso?
Almost never: Rosso sees virtually no snow, with about 0 frost days per year.
Has the climate of Rosso warmed?
Yes: Rosso warmed by +1.7 °C between 1940 and 2025, a statistically significant trend.
What is the wettest day in Rosso?
The wettest day measured in Rosso between 1940 and 2025 was 16 August 2010, with 111 mm of rain in 24 hours.
What was the windiest day in Rosso?
The windiest day measured in Rosso between 1940 and 2025 was 16 August 1987, with winds reaching 52.1 km/h.
What is the warmest month in Rosso?
The warmest month in Rosso is October (30.4 °C on average); the coldest is January (23.7 °C).
How much does it rain in Rosso?
Rosso receives on average 179 mm of precipitation per year, spread over about 25 rainy days.
Is it sunny in Rosso?
Rosso gets on average 11.1 hours of sunshine per day, roughly 4,052 hours per year over 1940-2025.
Are there tropical nights in Rosso?
Yes: Rosso has on average 257 tropical nights per year (temperature staying above 20 °C), over 1940-2025.
What was the most extreme apparent temperature in Rosso?
In Rosso, between 1940 and 2025, the highest apparent temperature reached 47.9 °C on 24 June 1998, and the lowest was 5.3 °C on 3 January 1943.
Compare Rosso with another city
Pick a second city: its normals will be set against these, indicator by indicator.
Nearby cities
The climate around Rosso