Golestān climate — normals and trends
Golestān (Iran) has a cold semi-arid climate (BSk) under the Köppen-Geiger classification. Its mean annual temperature is 16.7 °C and it receives 301 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 (31.3 °C on average) and the coldest is January (1.7 °C). Rainfall peaks in March.
Golestān averages 68 frost days, 128 hot days (≥ 30 °C) and 55 rainy days per year.
Golestān has warmed by +3.1 °C between 1940 and 2025, or +0.36 °C per decade. This trend is statistically significant.
The number of frost days there went from about 92 to 44 per year over the period.
The hottest day of the period reached 43.8 °C (on 16 July 1995) and the coldest -21.3 °C (on 21 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
GolestānTehran
- coords
- 35.52°, 51.18°
- period
- 1940–2025 · 86 yrs
Mean daily temperature
16.7°C
Average daily high
22.8°C
Average daily low
10.5°C
Annual rainfall
301mm
Sunshine / day
10.8h
Mean relative humidity
42%
Average peak wind
12.9km/h
Seasonal range
29.6°C
Frost days (< 0 °C)
68 d/yr
Hot days (≥ 30 °C)
128 d/yr
Rainy days (≥ 1 mm)
55 d/yr
Annual snowfall
24.9 cm
Average feels-like high
20.5 °C
Average feels-like low
7.5 °C
Average peak gust
28.6 km/h
Tropical nights (≥ 20 °C)
88 d/yr
Solar radiation
19.7 MJ/m²
Has the climate changed?
One stripe per year, 1940 to 2025
+3.1 °C
since 1940
+0.4 °C per decade · r² = 0.47 · 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
43.8 °C
16 July 1995
Coldest day
-21.3 °C
21 January 1964
Wettest day
43 mm
29 January 2013
Windiest day
41.2 km/h
25 April 1978
Strongest gust
81.4 km/h
7 April 1964
Hottest feels-like
43.2 °C
14 August 1977
Coldest feels-like
-26.6 °C
21 January 1964
Snowiest day
15.8 cm
6 January 2008
Sunniest day
13.5 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 | 10.4 °C | +2.9 °C | 18 mm | -24 mm |
| Feb | 9.8 °C | -0.2 °C | 36 mm | -6 mm |
| Mar | 18.4 °C | +3.2 °C | 45 mm | -13 mm |
| Apr | 26.7 °C | +4.7 °C | 17 mm | -24 mm |
| May | 33.3 °C | +4.6 °C | 3 mm | -15 mm |
| Jun | 35.4 °C | +0.6 °C | 3 mm | 0 mm |
| Jul | 38.9 °C | +1.5 °C | 1 mm | -0 mm |
| Aug | 38.1 °C | +1.9 °C | 0 mm | -1 mm |
| Sep | 33.0 °C | +1.1 °C | 0 mm | -2 mm |
| Oct | 28.3 °C | +3.7 °C | 0 mm | -14 mm |
| Nov | 20.1 °C | +4.3 °C | 1 mm | -36 mm |
| Dec | 11.3 °C | +1.7 °C | 25 mm | -17 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 Golestān?
Golestān has a cold semi-arid climate (Köppen BSk). Over 1940-2025, the average annual temperature is 16.7 °C and it receives 301 mm of precipitation per year.
What is the hottest day ever recorded in Golestān?
The hottest day measured in Golestān between 1940 and 2025 was 16 July 1995, reaching 43.8 °C.
What is the coldest day in Golestān?
The coldest day measured in Golestān between 1940 and 2025 was 21 January 1964, at -21.3 °C.
Does it snow in Golestān?
Yes. Golestān gets on average 24.9 cm of snow per year and has around 68 frost days.
Has the climate of Golestān warmed?
Yes: Golestān warmed by +3.1 °C between 1940 and 2025, a statistically significant trend.
What is the wettest day in Golestān?
The wettest day measured in Golestān between 1940 and 2025 was 29 January 2013, with 43 mm of rain in 24 hours.
What was the windiest day in Golestān?
The windiest day measured in Golestān between 1940 and 2025 was 25 April 1978, with winds reaching 41.2 km/h.
What is the warmest month in Golestān?
The warmest month in Golestān is July (31.3 °C on average); the coldest is January (1.7 °C).
How much does it rain in Golestān?
Golestān receives on average 301 mm of precipitation per year, spread over about 55 rainy days.
Is it sunny in Golestān?
Golestān gets on average 10.8 hours of sunshine per day, roughly 3,942 hours per year over 1940-2025.
What is the biggest single-day snowfall in Golestān?
The heaviest 24-hour snowfall measured in Golestān between 1940 and 2025 was 6 January 2008, with 15.8 cm.
Are there tropical nights in Golestān?
Yes: Golestān has on average 88 tropical nights per year (temperature staying above 20 °C), over 1940-2025.
What was the most extreme apparent temperature in Golestān?
In Golestān, between 1940 and 2025, the highest apparent temperature reached 43.2 °C on 14 August 1977, and the lowest was -26.6 °C on 21 January 1964.
Compare Golestān with another city
Pick a second city: its normals will be set against these, indicator by indicator.
Nearby cities
The climate around Golestān