Arak climate — normals and trends
Arak (Iran) has a cold semi-arid climate (BSk) under the Köppen-Geiger classification. Its mean annual temperature is 11.6 °C and it receives 243 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 (25.8 °C on average) and the coldest is January (-3.3 °C). Rainfall peaks in March.
Arak averages 116 frost days, 75 hot days (≥ 30 °C) and 53 rainy days per year.
Arak has warmed by +3.5 °C between 1940 and 2025, or +0.41 °C per decade. This trend is statistically significant.
The number of frost days there went from about 139 to 93 per year over the period.
The hottest day of the period reached 39.4 °C (on 25 July 2013) and the coldest -29.1 °C (on 20 January 1964).
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
ArakMarkazi
- coords
- 34.09°, 49.70°
- period
- 1940–2025 · 86 yrs
Mean daily temperature
11.6°C
Average daily high
18.2°C
Average daily low
5.4°C
Annual rainfall
243mm
Sunshine / day
11.0h
Mean relative humidity
46%
Average peak wind
14.7km/h
Seasonal range
29.1°C
Frost days (< 0 °C)
116 d/yr
Hot days (≥ 30 °C)
75 d/yr
Rainy days (≥ 1 mm)
53 d/yr
Annual snowfall
58.1 cm
Average feels-like high
15.3 °C
Average feels-like low
2.0 °C
Average peak gust
35.3 km/h
Tropical nights (≥ 20 °C)
9 d/yr
Solar radiation
20.5 MJ/m²
Has the climate changed?
One stripe per year, 1940 to 2025
+3.5 °C
since 1940
+0.4 °C per decade · r² = 0.50 · 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
39.4 °C
25 July 2013
Coldest day
-29.1 °C
20 January 1964
Wettest day
46 mm
31 March 2009
Windiest day
47.7 km/h
7 April 1964
Strongest gust
108.4 km/h
7 April 1964
Hottest feels-like
38.6 °C
16 July 1995
Coldest feels-like
-34.2 °C
20 January 1964
Snowiest day
27.9 cm
31 March 2009
Sunniest day
13.6 h
24 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 | 6.3 °C | +3.6 °C | 27 mm | -2 mm |
| Feb | 4.8 °C | -0.2 °C | 39 mm | +9 mm |
| Mar | 13.8 °C | +3.4 °C | 56 mm | +12 mm |
| Apr | 20.7 °C | +4.1 °C | 31 mm | -11 mm |
| May | 28.3 °C | +5.6 °C | 8 mm | -17 mm |
| Jun | 31.8 °C | +2.2 °C | 5 mm | +1 mm |
| Jul | 34.6 °C | +1.8 °C | 2 mm | +1 mm |
| Aug | 34.4 °C | +2.5 °C | 0 mm | -1 mm |
| Sep | 30.1 °C | +2.2 °C | 0 mm | -1 mm |
| Oct | 24.9 °C | +4.2 °C | 0 mm | -11 mm |
| Nov | 17.1 °C | +4.5 °C | 1 mm | -25 mm |
| Dec | 7.9 °C | +1.9 °C | 49 mm | +19 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 Arak?
Arak has a cold semi-arid climate (Köppen BSk). Over 1940-2025, the average annual temperature is 11.6 °C and it receives 243 mm of precipitation per year.
What is the hottest day ever recorded in Arak?
The hottest day measured in Arak between 1940 and 2025 was 25 July 2013, reaching 39.4 °C.
What is the coldest day in Arak?
The coldest day measured in Arak between 1940 and 2025 was 20 January 1964, at -29.1 °C.
Does it snow in Arak?
Yes. Arak gets on average 58.1 cm of snow per year and has around 116 frost days.
Has the climate of Arak warmed?
Yes: Arak warmed by +3.5 °C between 1940 and 2025, a statistically significant trend.
What is the wettest day in Arak?
The wettest day measured in Arak between 1940 and 2025 was 31 March 2009, with 46 mm of rain in 24 hours.
What was the windiest day in Arak?
The windiest day measured in Arak between 1940 and 2025 was 7 April 1964, with winds reaching 47.7 km/h.
What is the warmest month in Arak?
The warmest month in Arak is July (25.8 °C on average); the coldest is January (-3.3 °C).
How much does it rain in Arak?
Arak receives on average 243 mm of precipitation per year, spread over about 53 rainy days.
Is it sunny in Arak?
Arak gets on average 11.0 hours of sunshine per day, roughly 4,015 hours per year over 1940-2025.
What is the biggest single-day snowfall in Arak?
The heaviest 24-hour snowfall measured in Arak between 1940 and 2025 was 31 March 2009, with 27.9 cm.
Are there tropical nights in Arak?
Yes: Arak has on average 9 tropical nights per year (temperature staying above 20 °C), over 1940-2025.
What was the most extreme apparent temperature in Arak?
In Arak, between 1940 and 2025, the highest apparent temperature reached 38.6 °C on 16 July 1995, and the lowest was -34.2 °C on 20 January 1964.
Compare Arak with another city
Pick a second city: its normals will be set against these, indicator by indicator.
Nearby cities
The climate around Arak