Sīrjān climate — normals and trends
Sīrjān (Iran) has a cold desert climate (BWk) under the Köppen-Geiger classification. Its mean annual temperature is 16.4 °C and it receives 163 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 (28.1 °C on average) and the coldest is January (3.9 °C). Rainfall peaks in January.
Sīrjān averages 50 frost days, 111 hot days (≥ 30 °C) and 31 rainy days per year.
Sīrjān has warmed by +1.7 °C between 1940 and 2025, or +0.20 °C per decade. This trend is statistically significant.
The number of frost days there went from about 61 to 39 per year over the period.
The hottest day of the period reached 39.7 °C (on 28 July 2024) and the coldest -15.6 °C (on 7 January 1973).
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
SīrjānKerman
- coords
- 29.45°, 55.68°
- period
- 1940–2025 · 86 yrs
Mean daily temperature
16.4°C
Average daily high
22.6°C
Average daily low
10.0°C
Annual rainfall
163mm
Sunshine / day
11.2h
Mean relative humidity
34%
Average peak wind
18.6km/h
Seasonal range
24.2°C
Frost days (< 0 °C)
50 d/yr
Hot days (≥ 30 °C)
111 d/yr
Rainy days (≥ 1 mm)
31 d/yr
Annual snowfall
11.3 cm
Average feels-like high
19.3 °C
Average feels-like low
6.2 °C
Average peak gust
34.7 km/h
Tropical nights (≥ 20 °C)
47 d/yr
Solar radiation
22.1 MJ/m²
Has the climate changed?
One stripe per year, 1940 to 2025
+1.7 °C
since 1940
+0.2 °C per decade · r² = 0.40 · 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
39.7 °C
28 July 2024
Coldest day
-15.6 °C
7 January 1973
Wettest day
63 mm
4 February 1993
Windiest day
52.8 km/h
3 February 1988
Strongest gust
101.9 km/h
3 February 1988
Hottest feels-like
38.9 °C
6 August 1994
Coldest feels-like
-20.5 °C
7 January 1973
Snowiest day
17.8 cm
22 January 1957
Sunniest day
13.2 h
27 May 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 | 10.7 °C | +0.8 °C | 10 mm | -25 mm |
| Feb | 12.4 °C | +0.1 °C | 32 mm | -1 mm |
| Mar | 17.6 °C | +1.1 °C | 30 mm | -2 mm |
| Apr | 27.4 °C | +5.4 °C | 1 mm | -14 mm |
| May | 32.3 °C | +4.3 °C | 0 mm | -4 mm |
| Jun | 34.7 °C | +1.6 °C | 0 mm | -0 mm |
| Jul | 36.0 °C | +1.8 °C | 1 mm | -2 mm |
| Aug | 34.5 °C | +1.7 °C | 0 mm | -2 mm |
| Sep | 32.5 °C | +2.8 °C | 0 mm | -0 mm |
| Oct | 26.9 °C | +2.9 °C | 0 mm | -2 mm |
| Nov | 20.0 °C | +2.8 °C | 0 mm | -9 mm |
| Dec | 12.8 °C | +0.8 °C | 109 mm | +81 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 Sīrjān?
Sīrjān has a cold desert climate (Köppen BWk). Over 1940-2025, the average annual temperature is 16.4 °C and it receives 163 mm of precipitation per year.
What is the hottest day ever recorded in Sīrjān?
The hottest day measured in Sīrjān between 1940 and 2025 was 28 July 2024, reaching 39.7 °C.
What is the coldest day in Sīrjān?
The coldest day measured in Sīrjān between 1940 and 2025 was 7 January 1973, at -15.6 °C.
Does it snow in Sīrjān?
Yes. Sīrjān gets on average 11.3 cm of snow per year and has around 50 frost days.
Has the climate of Sīrjān warmed?
Yes: Sīrjān warmed by +1.7 °C between 1940 and 2025, a statistically significant trend.
What is the wettest day in Sīrjān?
The wettest day measured in Sīrjān between 1940 and 2025 was 4 February 1993, with 63 mm of rain in 24 hours.
What was the windiest day in Sīrjān?
The windiest day measured in Sīrjān between 1940 and 2025 was 3 February 1988, with winds reaching 52.8 km/h.
What is the warmest month in Sīrjān?
The warmest month in Sīrjān is July (28.1 °C on average); the coldest is January (3.9 °C).
How much does it rain in Sīrjān?
Sīrjān receives on average 163 mm of precipitation per year, spread over about 31 rainy days.
Is it sunny in Sīrjān?
Sīrjān 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 Sīrjān?
The heaviest 24-hour snowfall measured in Sīrjān between 1940 and 2025 was 22 January 1957, with 17.8 cm.
Are there tropical nights in Sīrjān?
Yes: Sīrjān has on average 47 tropical nights per year (temperature staying above 20 °C), over 1940-2025.
What was the most extreme apparent temperature in Sīrjān?
In Sīrjān, between 1940 and 2025, the highest apparent temperature reached 38.9 °C on 6 August 1994, and the lowest was -20.5 °C on 7 January 1973.
Compare Sīrjān with another city
Pick a second city: its normals will be set against these, indicator by indicator.
Nearby cities
The climate around Sīrjān