Hassi Messaoud climate — normals and trends
Hassi Messaoud (Algeria) has a hot desert climate (BWh) under the Köppen-Geiger classification. Its mean annual temperature is 22.5 °C and it receives 36 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 (34.6 °C on average) and the coldest is January (10.4 °C). Rainfall peaks in January.
Hassi Messaoud averages 3 frost days, 168 hot days (≥ 30 °C) and 8 rainy days per year.
Hassi Messaoud has warmed by +3.6 °C between 1940 and 2025, or +0.42 °C per decade. This trend is statistically significant.
The number of frost days there went from about 8 to 0 per year over the period.
The hottest day of the period reached 49.4 °C (on 28 July 2005) and the coldest -5.4 °C (on 6 January 1941).
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
Hassi MessaoudOuargla Province
- coords
- 31.68°, 6.07°
- period
- 1940–2025 · 86 yrs
Mean daily temperature
22.5°C
Average daily high
28.6°C
Average daily low
16.1°C
Annual rainfall
36mm
Sunshine / day
11.2h
Mean relative humidity
38%
Average peak wind
21.7km/h
Seasonal range
24.2°C
Frost days (< 0 °C)
3 d/yr
Hot days (≥ 30 °C)
168 d/yr
Rainy days (≥ 1 mm)
8 d/yr
Annual snowfall
0.0 cm
Average feels-like high
26.2 °C
Average feels-like low
12.9 °C
Average peak gust
34.4 km/h
Tropical nights (≥ 20 °C)
141 d/yr
Solar radiation
21.3 MJ/m²
Has the climate changed?
One stripe per year, 1940 to 2025
+3.6 °C
since 1940
+0.4 °C per decade · r² = 0.82 · 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
49.4 °C
28 July 2005
Coldest day
-5.4 °C
6 January 1941
Wettest day
50 mm
21 January 1990
Windiest day
65.4 km/h
21 January 1990
Strongest gust
103.7 km/h
21 January 1990
Hottest feels-like
49.0 °C
7 July 2012
Coldest feels-like
-10.2 °C
5 February 1956
Snowiest day
0.1 cm
19 December 1999
Sunniest day
13.2 h
20 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 | 18.6 °C | +2.3 °C | 1 mm | -5 mm |
| Feb | 20.0 °C | +0.8 °C | 6 mm | +2 mm |
| Mar | 27.2 °C | +3.9 °C | 1 mm | -5 mm |
| Apr | 29.8 °C | +1.8 °C | 1 mm | -2 mm |
| May | 33.9 °C | +0.7 °C | 1 mm | +0 mm |
| Jun | 39.1 °C | +0.6 °C | 0 mm | -0 mm |
| Jul | 42.5 °C | +1.4 °C | 0 mm | -0 mm |
| Aug | 41.0 °C | +0.6 °C | 0 mm | -0 mm |
| Sep | 36.9 °C | +1.2 °C | 0 mm | -1 mm |
| Oct | 31.2 °C | +2.2 °C | 1 mm | -2 mm |
| Nov | 23.6 °C | +1.6 °C | 0 mm | -4 mm |
| Dec | 18.1 °C | +1.2 °C | 15 mm | +10 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 Hassi Messaoud?
Hassi Messaoud has a hot desert climate (Köppen BWh). Over 1940-2025, the average annual temperature is 22.5 °C and it receives 36 mm of precipitation per year.
What is the hottest day ever recorded in Hassi Messaoud?
The hottest day measured in Hassi Messaoud between 1940 and 2025 was 28 July 2005, reaching 49.4 °C.
What is the coldest day in Hassi Messaoud?
The coldest day measured in Hassi Messaoud between 1940 and 2025 was 6 January 1941, at -5.4 °C.
Does it snow in Hassi Messaoud?
Almost never: Hassi Messaoud sees virtually no snow, with about 3 frost days per year.
Has the climate of Hassi Messaoud warmed?
Yes: Hassi Messaoud warmed by +3.6 °C between 1940 and 2025, a statistically significant trend.
What is the wettest day in Hassi Messaoud?
The wettest day measured in Hassi Messaoud between 1940 and 2025 was 21 January 1990, with 50 mm of rain in 24 hours.
What was the windiest day in Hassi Messaoud?
The windiest day measured in Hassi Messaoud between 1940 and 2025 was 21 January 1990, with winds reaching 65.4 km/h.
What is the warmest month in Hassi Messaoud?
The warmest month in Hassi Messaoud is July (34.6 °C on average); the coldest is January (10.4 °C).
How much does it rain in Hassi Messaoud?
Hassi Messaoud receives on average 36 mm of precipitation per year, spread over about 8 rainy days.
Is it sunny in Hassi Messaoud?
Hassi Messaoud gets on average 11.2 hours of sunshine per day, roughly 4,088 hours per year over 1940-2025.
What is the biggest single-day snowfall in Hassi Messaoud?
The heaviest 24-hour snowfall measured in Hassi Messaoud between 1940 and 2025 was 19 December 1999, with 0.1 cm.
Are there tropical nights in Hassi Messaoud?
Yes: Hassi Messaoud has on average 141 tropical nights per year (temperature staying above 20 °C), over 1940-2025.
What was the most extreme apparent temperature in Hassi Messaoud?
In Hassi Messaoud, between 1940 and 2025, the highest apparent temperature reached 49.0 °C on 7 July 2012, and the lowest was -10.2 °C on 5 February 1956.
Compare Hassi Messaoud with another city
Pick a second city: its normals will be set against these, indicator by indicator.
Nearby cities
The climate around Hassi Messaoud