Arris climate — normals and trends
Arris (Algeria) has a humid subtropical climate (Cfa) under the Köppen-Geiger classification. Its mean annual temperature is 12.5 °C and it receives 530 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 (23.7 °C on average) and the coldest is January (2.9 °C). Rainfall peaks in September.
Arris averages 67 frost days, 42 hot days (≥ 30 °C) and 100 rainy days per year.
Arris has warmed by +3.0 °C between 1940 and 2025, or +0.35 °C per decade. This trend is statistically significant.
The number of frost days there went from about 89 to 45 per year over the period.
The hottest day of the period reached 39.3 °C (on 10 July 2024) and the coldest -17.2 °C (on 3 January 1971).
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
ArrisBatna
- coords
- 35.26°, 6.35°
- period
- 1940–2025 · 86 yrs
Mean daily temperature
12.5°C
Average daily high
18.3°C
Average daily low
7.3°C
Annual rainfall
530mm
Sunshine / day
10.9h
Mean relative humidity
61%
Average peak wind
12.8km/h
Seasonal range
20.8°C
Frost days (< 0 °C)
67 d/yr
Hot days (≥ 30 °C)
42 d/yr
Rainy days (≥ 1 mm)
100 d/yr
Annual snowfall
45.1 cm
Average feels-like high
16.4 °C
Average feels-like low
4.8 °C
Average peak gust
41.7 km/h
Tropical nights (≥ 20 °C)
9 d/yr
Solar radiation
18.8 MJ/m²
Has the climate changed?
One stripe per year, 1940 to 2025
+3.0 °C
since 1940
+0.4 °C per decade · r² = 0.71 · 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
39.3 °C
10 July 2024
Coldest day
-17.2 °C
3 January 1971
Wettest day
48 mm
29 March 2004
Windiest day
36.9 km/h
12 December 2003
Strongest gust
115.6 km/h
19 January 2005
Hottest feels-like
38.2 °C
15 July 2024
Coldest feels-like
-21.7 °C
3 January 1971
Snowiest day
16.2 cm
21 January 2009
Sunniest day
13.7 h
23 June 2019
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 | 9.9 °C | +2.1 °C | 30 mm | -3 mm |
| Feb | 11.2 °C | +1.9 °C | 39 mm | +6 mm |
| Mar | 14.6 °C | +2.0 °C | 40 mm | -12 mm |
| Apr | 18.0 °C | +1.7 °C | 92 mm | +32 mm |
| May | 22.3 °C | +1.0 °C | 98 mm | +35 mm |
| Jun | 29.8 °C | +3.0 °C | 12 mm | -34 mm |
| Jul | 31.2 °C | +0.8 °C | 33 mm | +14 mm |
| Aug | 30.6 °C | +0.9 °C | 30 mm | -2 mm |
| Sep | 26.6 °C | +1.8 °C | 70 mm | +6 mm |
| Oct | 20.6 °C | +1.6 °C | 41 mm | -13 mm |
| Nov | 13.9 °C | +0.8 °C | 5 mm | -31 mm |
| Dec | 9.7 °C | +0.9 °C | 62 mm | +27 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 Arris?
Arris has a humid subtropical climate (Köppen Cfa). Over 1940-2025, the average annual temperature is 12.5 °C and it receives 530 mm of precipitation per year.
What is the hottest day ever recorded in Arris?
The hottest day measured in Arris between 1940 and 2025 was 10 July 2024, reaching 39.3 °C.
What is the coldest day in Arris?
The coldest day measured in Arris between 1940 and 2025 was 3 January 1971, at -17.2 °C.
Does it snow in Arris?
Yes. Arris gets on average 45.1 cm of snow per year and has around 67 frost days.
Has the climate of Arris warmed?
Yes: Arris warmed by +3.0 °C between 1940 and 2025, a statistically significant trend.
What is the wettest day in Arris?
The wettest day measured in Arris between 1940 and 2025 was 29 March 2004, with 48 mm of rain in 24 hours.
What was the windiest day in Arris?
The windiest day measured in Arris between 1940 and 2025 was 12 December 2003, with winds reaching 36.9 km/h.
What is the warmest month in Arris?
The warmest month in Arris is July (23.7 °C on average); the coldest is January (2.9 °C).
How much does it rain in Arris?
Arris receives on average 530 mm of precipitation per year, spread over about 100 rainy days.
Is it sunny in Arris?
Arris gets on average 10.9 hours of sunshine per day, roughly 3,979 hours per year over 1940-2025.
What is the biggest single-day snowfall in Arris?
The heaviest 24-hour snowfall measured in Arris between 1940 and 2025 was 21 January 2009, with 16.2 cm.
Are there tropical nights in Arris?
Yes: Arris has on average 9 tropical nights per year (temperature staying above 20 °C), over 1940-2025.
What was the most extreme apparent temperature in Arris?
In Arris, between 1940 and 2025, the highest apparent temperature reached 38.2 °C on 15 July 2024, and the lowest was -21.7 °C on 3 January 1971.
Compare Arris with another city
Pick a second city: its normals will be set against these, indicator by indicator.
Nearby cities
The climate around Arris