Surian climate — normals and trends
Surian (Iran) has a cold desert climate (BWk) under the Köppen-Geiger classification. Its mean annual temperature is 15.3 °C and it receives 133 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 (27.5 °C on average) and the coldest is January (2.6 °C). Rainfall peaks in April.
Surian averages 63 frost days, 90 hot days (≥ 30 °C) and 31 rainy days per year.
Surian has warmed by +1.9 °C between 1940 and 2025, or +0.22 °C per decade. This trend is statistically significant.
The number of frost days there went from about 72 to 54 per year over the period.
The hottest day of the period reached 40.1 °C (on 5 July 2025) and the coldest -19.8 °C (on 28 December 1963).
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
SurianFars
- coords
- 30.46°, 53.65°
- period
- 1940–2025 · 86 yrs
Mean daily temperature
15.3°C
Average daily high
21.4°C
Average daily low
9.4°C
Annual rainfall
133mm
Sunshine / day
11.2h
Mean relative humidity
33%
Average peak wind
17.6km/h
Seasonal range
24.9°C
Frost days (< 0 °C)
63 d/yr
Hot days (≥ 30 °C)
90 d/yr
Rainy days (≥ 1 mm)
31 d/yr
Annual snowfall
13.8 cm
Average feels-like high
18.0 °C
Average feels-like low
5.3 °C
Average peak gust
38.9 km/h
Tropical nights (≥ 20 °C)
52 d/yr
Solar radiation
21.8 MJ/m²
Has the climate changed?
One stripe per year, 1940 to 2025
+1.9 °C
since 1940
+0.2 °C per decade · r² = 0.44 · 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
40.1 °C
5 July 2025
Coldest day
-19.8 °C
28 December 1963
Wettest day
61 mm
2 December 1986
Windiest day
52.8 km/h
11 March 2022
Strongest gust
115.9 km/h
29 February 1956
Hottest feels-like
38.9 °C
3 July 2025
Coldest feels-like
-25.5 °C
28 December 1963
Snowiest day
16.2 cm
16 January 1959
Sunniest day
13.0 h
28 April 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 | 7.0 °C | -1.4 °C | 38 mm | +18 mm |
| Feb | 11.4 °C | +0.3 °C | 11 mm | -5 mm |
| Mar | 16.9 °C | +1.5 °C | 16 mm | -9 mm |
| Apr | 25.9 °C | +5.3 °C | 8 mm | -17 mm |
| May | 31.5 °C | +5.0 °C | 0 mm | -11 mm |
| Jun | 34.4 °C | +2.4 °C | 0 mm | -1 mm |
| Jul | 35.2 °C | +2.0 °C | 0 mm | -1 mm |
| Aug | 32.8 °C | +1.2 °C | 0 mm | -1 mm |
| Sep | 31.9 °C | +3.3 °C | 0 mm | -0 mm |
| Oct | 26.2 °C | +3.4 °C | 0 mm | -4 mm |
| Nov | 18.1 °C | +2.4 °C | 0 mm | -11 mm |
| Dec | 10.2 °C | -0.5 °C | 40 mm | +24 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 Surian?
Surian has a cold desert climate (Köppen BWk). Over 1940-2025, the average annual temperature is 15.3 °C and it receives 133 mm of precipitation per year.
What is the hottest day ever recorded in Surian?
The hottest day measured in Surian between 1940 and 2025 was 5 July 2025, reaching 40.1 °C.
What is the coldest day in Surian?
The coldest day measured in Surian between 1940 and 2025 was 28 December 1963, at -19.8 °C.
Does it snow in Surian?
Yes. Surian gets on average 13.8 cm of snow per year and has around 63 frost days.
Has the climate of Surian warmed?
Yes: Surian warmed by +1.9 °C between 1940 and 2025, a statistically significant trend.
What is the wettest day in Surian?
The wettest day measured in Surian between 1940 and 2025 was 2 December 1986, with 61 mm of rain in 24 hours.
What was the windiest day in Surian?
The windiest day measured in Surian between 1940 and 2025 was 11 March 2022, with winds reaching 52.8 km/h.
What is the warmest month in Surian?
The warmest month in Surian is July (27.5 °C on average); the coldest is January (2.6 °C).
How much does it rain in Surian?
Surian receives on average 133 mm of precipitation per year, spread over about 31 rainy days.
Is it sunny in Surian?
Surian gets on average 11.2 hours of sunshine per day, roughly 4,088 hours per year over 1940-2025.
What is the biggest single-day snowfall in Surian?
The heaviest 24-hour snowfall measured in Surian between 1940 and 2025 was 16 January 1959, with 16.2 cm.
Are there tropical nights in Surian?
Yes: Surian has on average 52 tropical nights per year (temperature staying above 20 °C), over 1940-2025.
What was the most extreme apparent temperature in Surian?
In Surian, between 1940 and 2025, the highest apparent temperature reached 38.9 °C on 3 July 2025, and the lowest was -25.5 °C on 28 December 1963.
Compare Surian with another city
Pick a second city: its normals will be set against these, indicator by indicator.
Nearby cities
The climate around Surian