Sīmīn Shahr climate — normals and trends
Sīmīn Shahr (Iran) has a hot-summer mediterranean climate (Csa) under the Köppen-Geiger classification. Its mean annual temperature is 17.8 °C and it receives 528 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 (27.7 °C on average) and the coldest is January (7.7 °C). Rainfall peaks in March.
Sīmīn Shahr averages 7 frost days, 76 hot days (≥ 30 °C) and 83 rainy days per year.
Sīmīn Shahr 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 12 to 2 per year over the period.
The hottest day of the period reached 43.6 °C (on 29 June 1995) and the coldest -11.6 °C (on 21 December 1948).
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
Sīmīn ShahrGolestan
- coords
- 37.01°, 54.23°
- period
- 1940–2025 · 86 yrs
Mean daily temperature
17.8°C
Average daily high
22.1°C
Average daily low
13.9°C
Annual rainfall
528mm
Sunshine / day
9.8h
Mean relative humidity
72%
Average peak wind
12.3km/h
Seasonal range
20.0°C
Frost days (< 0 °C)
7 d/yr
Hot days (≥ 30 °C)
76 d/yr
Rainy days (≥ 1 mm)
83 d/yr
Annual snowfall
8.0 cm
Average feels-like high
22.8 °C
Average feels-like low
13.6 °C
Average peak gust
25.2 km/h
Tropical nights (≥ 20 °C)
107 d/yr
Solar radiation
16.0 MJ/m²
Has the climate changed?
One stripe per year, 1940 to 2025
+3.0 °C
since 1940
+0.4 °C per decade · r² = 0.59 · 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
43.6 °C
29 June 1995
Coldest day
-11.6 °C
21 December 1948
Wettest day
93 mm
18 March 2019
Windiest day
44.8 km/h
18 March 2019
Strongest gust
84.6 km/h
16 May 2022
Hottest feels-like
46.3 °C
12 August 1997
Coldest feels-like
-17.0 °C
21 December 1948
Snowiest day
17.3 cm
2 February 1967
Sunniest day
13.5 h
3 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 | 13.9 °C | +2.0 °C | 18 mm | -43 mm |
| Feb | 11.9 °C | -0.9 °C | 74 mm | +9 mm |
| Mar | 19.2 °C | +3.4 °C | 62 mm | -9 mm |
| Apr | 24.9 °C | +4.0 °C | 25 mm | -18 mm |
| May | 28.2 °C | +2.5 °C | 15 mm | -16 mm |
| Jun | 30.1 °C | +0.8 °C | 10 mm | -8 mm |
| Jul | 32.7 °C | +1.4 °C | 14 mm | -3 mm |
| Aug | 34.8 °C | +2.9 °C | 9 mm | -9 mm |
| Sep | 30.3 °C | +1.2 °C | 26 mm | -5 mm |
| Oct | 27.5 °C | +3.3 °C | 26 mm | -24 mm |
| Nov | 22.9 °C | +4.6 °C | 4 mm | -57 mm |
| Dec | 15.5 °C | +1.8 °C | 51 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 Sīmīn Shahr?
Sīmīn Shahr has a hot-summer mediterranean climate (Köppen Csa). Over 1940-2025, the average annual temperature is 17.8 °C and it receives 528 mm of precipitation per year.
What is the hottest day ever recorded in Sīmīn Shahr?
The hottest day measured in Sīmīn Shahr between 1940 and 2025 was 29 June 1995, reaching 43.6 °C.
What is the coldest day in Sīmīn Shahr?
The coldest day measured in Sīmīn Shahr between 1940 and 2025 was 21 December 1948, at -11.6 °C.
Does it snow in Sīmīn Shahr?
Yes. Sīmīn Shahr gets on average 8.0 cm of snow per year and has around 7 frost days.
Has the climate of Sīmīn Shahr warmed?
Yes: Sīmīn Shahr warmed by +3.0 °C between 1940 and 2025, a statistically significant trend.
What is the wettest day in Sīmīn Shahr?
The wettest day measured in Sīmīn Shahr between 1940 and 2025 was 18 March 2019, with 93 mm of rain in 24 hours.
What was the windiest day in Sīmīn Shahr?
The windiest day measured in Sīmīn Shahr between 1940 and 2025 was 18 March 2019, with winds reaching 44.8 km/h.
What is the warmest month in Sīmīn Shahr?
The warmest month in Sīmīn Shahr is August (27.7 °C on average); the coldest is January (7.7 °C).
How much does it rain in Sīmīn Shahr?
Sīmīn Shahr receives on average 528 mm of precipitation per year, spread over about 83 rainy days.
Is it sunny in Sīmīn Shahr?
Sīmīn Shahr gets on average 9.8 hours of sunshine per day, roughly 3,577 hours per year over 1940-2025.
What is the biggest single-day snowfall in Sīmīn Shahr?
The heaviest 24-hour snowfall measured in Sīmīn Shahr between 1940 and 2025 was 2 February 1967, with 17.3 cm.
Are there tropical nights in Sīmīn Shahr?
Yes: Sīmīn Shahr has on average 107 tropical nights per year (temperature staying above 20 °C), over 1940-2025.
What was the most extreme apparent temperature in Sīmīn Shahr?
In Sīmīn Shahr, between 1940 and 2025, the highest apparent temperature reached 46.3 °C on 12 August 1997, and the lowest was -17.0 °C on 21 December 1948.
Compare Sīmīn Shahr with another city
Pick a second city: its normals will be set against these, indicator by indicator.
Nearby cities
The climate around Sīmīn Shahr