Semīrom climate — normals and trends
Semīrom (Iran) has a hot-summer mediterranean continental climate (Dsa) under the Köppen-Geiger classification. Its mean annual temperature is 9.3 °C and it receives 268 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 (22.6 °C on average) and the coldest is January (-5.5 °C). Rainfall peaks in January.
Semīrom averages 141 frost days, 31 hot days (≥ 30 °C) and 38 rainy days per year.
Semīrom has warmed by +2.3 °C between 1940 and 2025, or +0.27 °C per decade. This trend is statistically significant.
The number of frost days there went from about 153 to 129 per year over the period.
The hottest day of the period reached 37.1 °C (on 28 July 2024) and the coldest -33.3 °C (on 20 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
SemīromIsfahan
- coords
- 31.42°, 51.57°
- period
- 1940–2025 · 86 yrs
Mean daily temperature
9.3°C
Average daily high
15.9°C
Average daily low
2.7°C
Annual rainfall
268mm
Sunshine / day
11.1h
Mean relative humidity
47%
Average peak wind
14.2km/h
Seasonal range
28.1°C
Frost days (< 0 °C)
141 d/yr
Hot days (≥ 30 °C)
31 d/yr
Rainy days (≥ 1 mm)
38 d/yr
Annual snowfall
118.0 cm
Average feels-like high
13.1 °C
Average feels-like low
-0.9 °C
Average peak gust
35.9 km/h
Tropical nights (≥ 20 °C)
0 d/yr
Solar radiation
21.7 MJ/m²
Has the climate changed?
One stripe per year, 1940 to 2025
+2.3 °C
since 1940
+0.3 °C per decade · r² = 0.31 · 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
37.1 °C
28 July 2024
Coldest day
-33.3 °C
20 January 1964
Wettest day
73 mm
20 December 1986
Windiest day
43.7 km/h
6 May 1972
Strongest gust
103.0 km/h
26 April 2020
Hottest feels-like
36.4 °C
28 July 2024
Coldest feels-like
-38.6 °C
20 January 1964
Snowiest day
50.7 cm
20 December 1986
Sunniest day
13.0 h
22 June 2025
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 | 6.1 °C | +6.2 °C | 18 mm | -34 mm |
| Feb | 7.0 °C | +5.5 °C | 17 mm | -29 mm |
| Mar | 12.4 °C | +5.0 °C | 76 mm | +26 mm |
| Apr | 20.4 °C | +5.9 °C | 11 mm | -17 mm |
| May | 27.2 °C | +6.4 °C | 2 mm | -6 mm |
| Jun | 31.1 °C | +3.8 °C | 1 mm | +1 mm |
| Jul | 32.8 °C | +2.9 °C | 0 mm | -1 mm |
| Aug | 31.5 °C | +2.5 °C | 0 mm | -1 mm |
| Sep | 28.8 °C | +3.1 °C | 0 mm | -0 mm |
| Oct | 23.5 °C | +4.2 °C | 0 mm | -4 mm |
| Nov | 16.6 °C | +4.9 °C | 0 mm | -30 mm |
| Dec | 6.3 °C | +2.1 °C | 79 mm | +32 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 Semīrom?
Semīrom has a hot-summer mediterranean continental climate (Köppen Dsa). Over 1940-2025, the average annual temperature is 9.3 °C and it receives 268 mm of precipitation per year.
What is the hottest day ever recorded in Semīrom?
The hottest day measured in Semīrom between 1940 and 2025 was 28 July 2024, reaching 37.1 °C.
What is the coldest day in Semīrom?
The coldest day measured in Semīrom between 1940 and 2025 was 20 January 1964, at -33.3 °C.
Does it snow in Semīrom?
Yes. Semīrom gets on average 118.0 cm of snow per year and has around 141 frost days.
Has the climate of Semīrom warmed?
Yes: Semīrom warmed by +2.3 °C between 1940 and 2025, a statistically significant trend.
What is the wettest day in Semīrom?
The wettest day measured in Semīrom between 1940 and 2025 was 20 December 1986, with 73 mm of rain in 24 hours.
What was the windiest day in Semīrom?
The windiest day measured in Semīrom between 1940 and 2025 was 6 May 1972, with winds reaching 43.7 km/h.
What is the warmest month in Semīrom?
The warmest month in Semīrom is July (22.6 °C on average); the coldest is January (-5.5 °C).
How much does it rain in Semīrom?
Semīrom receives on average 268 mm of precipitation per year, spread over about 38 rainy days.
Is it sunny in Semīrom?
Semīrom gets on average 11.1 hours of sunshine per day, roughly 4,052 hours per year over 1940-2025.
What is the biggest single-day snowfall in Semīrom?
The heaviest 24-hour snowfall measured in Semīrom between 1940 and 2025 was 20 December 1986, with 50.7 cm.
Are there tropical nights in Semīrom?
Almost never: tropical nights (temperature staying above 20 °C) are virtually non-existent in Semīrom.
What was the most extreme apparent temperature in Semīrom?
In Semīrom, between 1940 and 2025, the highest apparent temperature reached 36.4 °C on 28 July 2024, and the lowest was -38.6 °C on 20 January 1964.
Compare Semīrom with another city
Pick a second city: its normals will be set against these, indicator by indicator.
Nearby cities
The climate around Semīrom