Sīāhkal climate — normals and trends
Sīāhkal (Iran) has a humid subtropical climate (Cfa) under the Köppen-Geiger classification. Its mean annual temperature is 15.6 °C and it receives 1,297 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 (25.1 °C on average) and the coldest is January (5.9 °C). Rainfall peaks in October.
Sīāhkal averages 25 frost days, 43 hot days (≥ 30 °C) and 136 rainy days per year.
Sīāhkal has warmed by +2.5 °C between 1940 and 2025, or +0.29 °C per decade. This trend is statistically significant.
The number of frost days there went from about 35 to 15 per year over the period.
The hottest day of the period reached 37.7 °C (on 4 September 2022) and the coldest -13.2 °C (on 25 November 2016).
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
SīāhkalGilan Province
- coords
- 37.15°, 49.87°
- period
- 1940–2025 · 86 yrs
Mean daily temperature
15.6°C
Average daily high
20.3°C
Average daily low
11.4°C
Annual rainfall
1,297mm
Sunshine / day
9.2h
Mean relative humidity
79%
Average peak wind
11.7km/h
Seasonal range
19.2°C
Frost days (< 0 °C)
25 d/yr
Hot days (≥ 30 °C)
43 d/yr
Rainy days (≥ 1 mm)
136 d/yr
Annual snowfall
41.2 cm
Average feels-like high
21.1 °C
Average feels-like low
10.7 °C
Average peak gust
27.0 km/h
Tropical nights (≥ 20 °C)
52 d/yr
Solar radiation
15.2 MJ/m²
Has the climate changed?
One stripe per year, 1940 to 2025
+2.5 °C
since 1940
+0.3 °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
37.7 °C
4 September 2022
Coldest day
-13.2 °C
25 November 2016
Wettest day
95 mm
17 September 2006
Windiest day
38.7 km/h
20 February 1946
Strongest gust
81.7 km/h
3 November 2014
Hottest feels-like
44.2 °C
12 August 2003
Coldest feels-like
-18.4 °C
11 February 1959
Snowiest day
31.7 cm
11 February 2020
Sunniest day
14.0 h
25 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 | +2.5 °C | 94 mm | -17 mm |
| Feb | 10.6 °C | -1.0 °C | 214 mm | +104 mm |
| Mar | 17.6 °C | +3.2 °C | 119 mm | +7 mm |
| Apr | 21.5 °C | +2.6 °C | 84 mm | +14 mm |
| May | 24.6 °C | +1.1 °C | 23 mm | -31 mm |
| Jun | 28.9 °C | +1.4 °C | 30 mm | -30 mm |
| Jul | 32.2 °C | +2.6 °C | 37 mm | -30 mm |
| Aug | 32.6 °C | +3.1 °C | 42 mm | -48 mm |
| Sep | 26.6 °C | +0.7 °C | 235 mm | +85 mm |
| Oct | 23.6 °C | +2.0 °C | 124 mm | -64 mm |
| Nov | 20.8 °C | +3.6 °C | 14 mm | -146 mm |
| Dec | 14.9 °C | +1.8 °C | 200 mm | +76 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 Sīāhkal?
Sīāhkal has a humid subtropical climate (Köppen Cfa). Over 1940-2025, the average annual temperature is 15.6 °C and it receives 1,297 mm of precipitation per year.
What is the hottest day ever recorded in Sīāhkal?
The hottest day measured in Sīāhkal between 1940 and 2025 was 4 September 2022, reaching 37.7 °C.
What is the coldest day in Sīāhkal?
The coldest day measured in Sīāhkal between 1940 and 2025 was 25 November 2016, at -13.2 °C.
Does it snow in Sīāhkal?
Yes. Sīāhkal gets on average 41.2 cm of snow per year and has around 25 frost days.
Has the climate of Sīāhkal warmed?
Yes: Sīāhkal warmed by +2.5 °C between 1940 and 2025, a statistically significant trend.
What is the wettest day in Sīāhkal?
The wettest day measured in Sīāhkal between 1940 and 2025 was 17 September 2006, with 95 mm of rain in 24 hours.
What was the windiest day in Sīāhkal?
The windiest day measured in Sīāhkal between 1940 and 2025 was 20 February 1946, with winds reaching 38.7 km/h.
What is the warmest month in Sīāhkal?
The warmest month in Sīāhkal is July (25.1 °C on average); the coldest is January (5.9 °C).
How much does it rain in Sīāhkal?
Sīāhkal receives on average 1,297 mm of precipitation per year, spread over about 136 rainy days.
Is it sunny in Sīāhkal?
Sīāhkal gets on average 9.2 hours of sunshine per day, roughly 3,358 hours per year over 1940-2025.
What is the biggest single-day snowfall in Sīāhkal?
The heaviest 24-hour snowfall measured in Sīāhkal between 1940 and 2025 was 11 February 2020, with 31.7 cm.
Are there tropical nights in Sīāhkal?
Yes: Sīāhkal has on average 52 tropical nights per year (temperature staying above 20 °C), over 1940-2025.
What was the most extreme apparent temperature in Sīāhkal?
In Sīāhkal, between 1940 and 2025, the highest apparent temperature reached 44.2 °C on 12 August 2003, and the lowest was -18.4 °C on 11 February 1959.
Compare Sīāhkal with another city
Pick a second city: its normals will be set against these, indicator by indicator.
Nearby cities
The climate around Sīāhkal