Aïn Oussera climate — normals and trends
Aïn Oussera (Algeria) has a cold desert climate (BWk) under the Köppen-Geiger classification. Its mean annual temperature is 16.9 °C and it receives 227 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 (29.1 °C on average) and the coldest is January (6.6 °C). Rainfall peaks in April.
Aïn Oussera averages 18 frost days, 109 hot days (≥ 30 °C) and 50 rainy days per year.
Aïn Oussera has warmed by +2.8 °C between 1940 and 2025, or +0.33 °C per decade. This trend is statistically significant.
The number of frost days there went from about 29 to 7 per year over the period.
The hottest day of the period reached 44.4 °C (on 14 July 2012) and the coldest -10.1 °C (on 17 December 1960).
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
Aïn OusseraDjelfa Province
- coords
- 35.45°, 2.91°
- period
- 1940–2025 · 86 yrs
Mean daily temperature
16.9°C
Average daily high
23.1°C
Average daily low
11.0°C
Annual rainfall
227mm
Sunshine / day
10.6h
Mean relative humidity
57%
Average peak wind
19.1km/h
Seasonal range
22.5°C
Frost days (< 0 °C)
18 d/yr
Hot days (≥ 30 °C)
109 d/yr
Rainy days (≥ 1 mm)
50 d/yr
Annual snowfall
2.5 cm
Average feels-like high
20.8 °C
Average feels-like low
8.9 °C
Average peak gust
32.8 km/h
Tropical nights (≥ 20 °C)
59 d/yr
Solar radiation
19.0 MJ/m²
Has the climate changed?
One stripe per year, 1940 to 2025
+2.8 °C
since 1940
+0.3 °C per decade · r² = 0.61 · 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
44.4 °C
14 July 2012
Coldest day
-10.1 °C
17 December 1960
Wettest day
47 mm
19 December 1999
Windiest day
60.0 km/h
5 March 2009
Strongest gust
112.7 km/h
5 March 2009
Hottest feels-like
43.5 °C
11 July 2012
Coldest feels-like
-14.9 °C
17 December 1960
Snowiest day
13.4 cm
19 December 1999
Sunniest day
14.0 h
8 June 1940
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 | 13.6 °C | +2.0 °C | 29 mm | +5 mm |
| Feb | 16.7 °C | +2.9 °C | 5 mm | -15 mm |
| Mar | 19.6 °C | +2.2 °C | 16 mm | -9 mm |
| Apr | 24.2 °C | +3.0 °C | 28 mm | -1 mm |
| May | 27.6 °C | +1.2 °C | 51 mm | +28 mm |
| Jun | 36.9 °C | +4.5 °C | 1 mm | -11 mm |
| Jul | 38.3 °C | +1.8 °C | 2 mm | -2 mm |
| Aug | 36.8 °C | +1.2 °C | 3 mm | -4 mm |
| Sep | 31.8 °C | +1.8 °C | 26 mm | +8 mm |
| Oct | 26.1 °C | +2.7 °C | 17 mm | -6 mm |
| Nov | 18.7 °C | +1.9 °C | 9 mm | -11 mm |
| Dec | 13.2 °C | +0.8 °C | 43 mm | +20 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 Aïn Oussera?
Aïn Oussera has a cold desert climate (Köppen BWk). Over 1940-2025, the average annual temperature is 16.9 °C and it receives 227 mm of precipitation per year.
What is the hottest day ever recorded in Aïn Oussera?
The hottest day measured in Aïn Oussera between 1940 and 2025 was 14 July 2012, reaching 44.4 °C.
What is the coldest day in Aïn Oussera?
The coldest day measured in Aïn Oussera between 1940 and 2025 was 17 December 1960, at -10.1 °C.
Does it snow in Aïn Oussera?
Yes. Aïn Oussera gets on average 2.5 cm of snow per year and has around 18 frost days.
Has the climate of Aïn Oussera warmed?
Yes: Aïn Oussera warmed by +2.8 °C between 1940 and 2025, a statistically significant trend.
What is the wettest day in Aïn Oussera?
The wettest day measured in Aïn Oussera between 1940 and 2025 was 19 December 1999, with 47 mm of rain in 24 hours.
What was the windiest day in Aïn Oussera?
The windiest day measured in Aïn Oussera between 1940 and 2025 was 5 March 2009, with winds reaching 60.0 km/h.
What is the warmest month in Aïn Oussera?
The warmest month in Aïn Oussera is July (29.1 °C on average); the coldest is January (6.6 °C).
How much does it rain in Aïn Oussera?
Aïn Oussera receives on average 227 mm of precipitation per year, spread over about 50 rainy days.
Is it sunny in Aïn Oussera?
Aïn Oussera gets on average 10.6 hours of sunshine per day, roughly 3,869 hours per year over 1940-2025.
What is the biggest single-day snowfall in Aïn Oussera?
The heaviest 24-hour snowfall measured in Aïn Oussera between 1940 and 2025 was 19 December 1999, with 13.4 cm.
Are there tropical nights in Aïn Oussera?
Yes: Aïn Oussera has on average 59 tropical nights per year (temperature staying above 20 °C), over 1940-2025.
What was the most extreme apparent temperature in Aïn Oussera?
In Aïn Oussera, between 1940 and 2025, the highest apparent temperature reached 43.5 °C on 11 July 2012, and the lowest was -14.9 °C on 17 December 1960.
Compare Aïn Oussera with another city
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Nearby cities
The climate around Aïn Oussera