Chālūs climate — normals and trends
Chālūs (Iran) has a humid subtropical climate (Cfa) under the Köppen-Geiger classification. Its mean annual temperature is 16.9 °C and it receives 1,353 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 August (25.3 °C on average) and the coldest is February (8.8 °C). Rainfall peaks in November.
Chālūs averages 0 frost days, 5 hot days (≥ 30 °C) and 165 rainy days per year.
Chālūs has warmed by +2.0 °C between 1940 and 2025, or +0.24 °C per decade. This trend is statistically significant.
The hottest day of the period reached 34.4 °C (on 16 August 2015) and the coldest -2.3 °C (on 2 February 2014).
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
ChālūsMazandaran
- coords
- 36.66°, 51.42°
- period
- 1940–2025 · 86 yrs
Mean daily temperature
16.9°C
Average daily high
18.5°C
Average daily low
15.4°C
Annual rainfall
1,353mm
Sunshine / day
10.0h
Mean relative humidity
82%
Average peak wind
13.7km/h
Seasonal range
16.5°C
Frost days (< 0 °C)
0 d/yr
Hot days (≥ 30 °C)
5 d/yr
Rainy days (≥ 1 mm)
165 d/yr
Annual snowfall
11.3 cm
Average feels-like high
19.3 °C
Average feels-like low
15.3 °C
Average peak gust
24.9 km/h
Tropical nights (≥ 20 °C)
115 d/yr
Solar radiation
15.6 MJ/m²
Has the climate changed?
One stripe per year, 1940 to 2025
+2.0 °C
since 1940
+0.2 °C per decade · r² = 0.52 · 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
34.4 °C
16 August 2015
Coldest day
-2.3 °C
2 February 2014
Wettest day
136 mm
5 October 2018
Windiest day
45.1 km/h
25 December 1947
Strongest gust
90.7 km/h
11 November 1995
Hottest feels-like
42.1 °C
16 August 2015
Coldest feels-like
-7.3 °C
19 January 1964
Snowiest day
16.7 cm
7 February 1950
Sunniest day
13.5 h
2 July 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 | 12.2 °C | +1.3 °C | 95 mm | -45 mm |
| Feb | 9.7 °C | -0.7 °C | 132 mm | +14 mm |
| Mar | 14.5 °C | +2.5 °C | 94 mm | -9 mm |
| Apr | 19.1 °C | +3.1 °C | 46 mm | -25 mm |
| May | 21.3 °C | +0.9 °C | 35 mm | -21 mm |
| Jun | 23.8 °C | -0.3 °C | 15 mm | -31 mm |
| Jul | 26.9 °C | +0.8 °C | 30 mm | -19 mm |
| Aug | 28.4 °C | +1.8 °C | 62 mm | -4 mm |
| Sep | 24.2 °C | 0.0 °C | 192 mm | +64 mm |
| Oct | 22.3 °C | +1.4 °C | 106 mm | -90 mm |
| Nov | 19.8 °C | +3.0 °C | 66 mm | -143 mm |
| Dec | 14.9 °C | +1.8 °C | 240 mm | +67 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 Chālūs?
Chālūs has a humid subtropical climate (Köppen Cfa). Over 1940-2025, the average annual temperature is 16.9 °C and it receives 1,353 mm of precipitation per year.
What is the hottest day ever recorded in Chālūs?
The hottest day measured in Chālūs between 1940 and 2025 was 16 August 2015, reaching 34.4 °C.
What is the coldest day in Chālūs?
The coldest day measured in Chālūs between 1940 and 2025 was 2 February 2014, at -2.3 °C.
Does it snow in Chālūs?
Yes. Chālūs gets on average 11.3 cm of snow per year and has around 0 frost days.
Has the climate of Chālūs warmed?
Yes: Chālūs warmed by +2.0 °C between 1940 and 2025, a statistically significant trend.
What is the wettest day in Chālūs?
The wettest day measured in Chālūs between 1940 and 2025 was 5 October 2018, with 136 mm of rain in 24 hours.
What was the windiest day in Chālūs?
The windiest day measured in Chālūs between 1940 and 2025 was 25 December 1947, with winds reaching 45.1 km/h.
What is the warmest month in Chālūs?
The warmest month in Chālūs is August (25.3 °C on average); the coldest is February (8.8 °C).
How much does it rain in Chālūs?
Chālūs receives on average 1,353 mm of precipitation per year, spread over about 165 rainy days.
Is it sunny in Chālūs?
Chālūs gets on average 10.0 hours of sunshine per day, roughly 3,650 hours per year over 1940-2025.
What is the biggest single-day snowfall in Chālūs?
The heaviest 24-hour snowfall measured in Chālūs between 1940 and 2025 was 7 February 1950, with 16.7 cm.
Are there tropical nights in Chālūs?
Yes: Chālūs has on average 115 tropical nights per year (temperature staying above 20 °C), over 1940-2025.
What was the most extreme apparent temperature in Chālūs?
In Chālūs, between 1940 and 2025, the highest apparent temperature reached 42.1 °C on 16 August 2015, and the lowest was -7.3 °C on 19 January 1964.
Compare Chālūs with another city
Pick a second city: its normals will be set against these, indicator by indicator.
Nearby cities
The climate around Chālūs