Diffa climate — normals and trends
Diffa (Niger) has a hot desert climate (BWh) under the Köppen-Geiger classification. Its mean annual temperature is 27.9 °C and it receives 280 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 May (33.1 °C on average) and the coldest is January (21.6 °C). Rainfall peaks in August.
Diffa averages 0 frost days, 312 hot days (≥ 30 °C) and 45 rainy days per year.
Diffa has warmed by +2.1 °C between 1940 and 2025, or +0.25 °C per decade. This trend is statistically significant.
The hottest day of the period reached 44.9 °C (on 17 April 1998) and the coldest 7.4 °C (on 26 December 1980).
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
DiffaDiffa
- coords
- 13.32°, 12.61°
- period
- 1940–2025 · 86 yrs
Mean daily temperature
27.9°C
Average daily high
35.0°C
Average daily low
21.8°C
Annual rainfall
280mm
Sunshine / day
11.2h
Mean relative humidity
35%
Average peak wind
16.2km/h
Seasonal range
11.5°C
Frost days (< 0 °C)
0 d/yr
Hot days (≥ 30 °C)
312 d/yr
Rainy days (≥ 1 mm)
45 d/yr
Annual snowfall
0.0 cm
Average feels-like high
35.1 °C
Average feels-like low
20.4 °C
Average peak gust
34.1 km/h
Tropical nights (≥ 20 °C)
247 d/yr
Solar radiation
23.5 MJ/m²
Has the climate changed?
One stripe per year, 1940 to 2025
+2.1 °C
since 1940
+0.3 °C per decade · r² = 0.58 · 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
44.9 °C
17 April 1998
Coldest day
7.4 °C
26 December 1980
Wettest day
148 mm
30 August 2024
Windiest day
35.5 km/h
10 May 2012
Strongest gust
64.8 km/h
10 May 2012
Hottest feels-like
47.7 °C
11 April 2016
Coldest feels-like
2.5 °C
26 December 1980
Sunniest day
12.5 h
13 July 1941
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 | 31.3 °C | +1.8 °C | 0 mm | 0 mm |
| Feb | 33.4 °C | +0.9 °C | 0 mm | 0 mm |
| Mar | 39.1 °C | +2.3 °C | 0 mm | -0 mm |
| Apr | 40.5 °C | +0.5 °C | 0 mm | -1 mm |
| May | 41.1 °C | +0.8 °C | 0 mm | -6 mm |
| Jun | 39.0 °C | +0.7 °C | 1 mm | -17 mm |
| Jul | 33.6 °C | -0.9 °C | 62 mm | -16 mm |
| Aug | 31.8 °C | -0.4 °C | 60 mm | -76 mm |
| Sep | 33.9 °C | -1.0 °C | 61 mm | +24 mm |
| Oct | 36.8 °C | 0.0 °C | 1 mm | -3 mm |
| Nov | 35.2 °C | +1.3 °C | 0 mm | -0 mm |
| Dec | 33.2 °C | +2.9 °C | 0 mm | 0 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 Diffa?
Diffa has a hot desert climate (Köppen BWh). Over 1940-2025, the average annual temperature is 27.9 °C and it receives 280 mm of precipitation per year.
What is the hottest day ever recorded in Diffa?
The hottest day measured in Diffa between 1940 and 2025 was 17 April 1998, reaching 44.9 °C.
What is the coldest day in Diffa?
The coldest day measured in Diffa between 1940 and 2025 was 26 December 1980, at 7.4 °C.
Does it snow in Diffa?
Almost never: Diffa sees virtually no snow, with about 0 frost days per year.
Has the climate of Diffa warmed?
Yes: Diffa warmed by +2.1 °C between 1940 and 2025, a statistically significant trend.
What is the wettest day in Diffa?
The wettest day measured in Diffa between 1940 and 2025 was 30 August 2024, with 148 mm of rain in 24 hours.
What was the windiest day in Diffa?
The windiest day measured in Diffa between 1940 and 2025 was 10 May 2012, with winds reaching 35.5 km/h.
What is the warmest month in Diffa?
The warmest month in Diffa is May (33.1 °C on average); the coldest is January (21.6 °C).
How much does it rain in Diffa?
Diffa receives on average 280 mm of precipitation per year, spread over about 45 rainy days.
Is it sunny in Diffa?
Diffa gets on average 11.2 hours of sunshine per day, roughly 4,088 hours per year over 1940-2025.
Are there tropical nights in Diffa?
Yes: Diffa has on average 247 tropical nights per year (temperature staying above 20 °C), over 1940-2025.
What was the most extreme apparent temperature in Diffa?
In Diffa, between 1940 and 2025, the highest apparent temperature reached 47.7 °C on 11 April 2016, and the lowest was 2.5 °C on 26 December 1980.
Compare Diffa with another city
Pick a second city: its normals will be set against these, indicator by indicator.
Nearby cities
The climate around Diffa