Dehlorān climate — normals and trends
Dehlorān (Iran) has a hot semi-arid climate (BSh) under the Köppen-Geiger classification. Its mean annual temperature is 21.8 °C and it receives 411 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 (34.8 °C on average) and the coldest is January (8.5 °C). Rainfall peaks in January.
Dehlorān averages 6 frost days, 172 hot days (≥ 30 °C) and 44 rainy days per year.
Dehlorān has warmed by +2.4 °C between 1940 and 2025, or +0.28 °C per decade. This trend is statistically significant.
The number of frost days there went from about 9 to 3 per year over the period.
The hottest day of the period reached 47.8 °C (on 30 July 2020) and the coldest -11.0 °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
DehlorānIlam Province
- coords
- 32.69°, 47.27°
- period
- 1940–2025 · 86 yrs
Mean daily temperature
21.8°C
Average daily high
28.0°C
Average daily low
15.8°C
Annual rainfall
411mm
Sunshine / day
11.0h
Mean relative humidity
41%
Average peak wind
15.6km/h
Seasonal range
26.3°C
Frost days (< 0 °C)
6 d/yr
Hot days (≥ 30 °C)
172 d/yr
Rainy days (≥ 1 mm)
44 d/yr
Annual snowfall
0.7 cm
Average feels-like high
26.2 °C
Average feels-like low
12.9 °C
Average peak gust
34.6 km/h
Tropical nights (≥ 20 °C)
142 d/yr
Solar radiation
20.5 MJ/m²
Has the climate changed?
One stripe per year, 1940 to 2025
+2.4 °C
since 1940
+0.3 °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
47.8 °C
30 July 2020
Coldest day
-11.0 °C
20 January 1964
Wettest day
96 mm
2 February 1993
Windiest day
36.0 km/h
8 February 1969
Strongest gust
98.3 km/h
13 April 1971
Hottest feels-like
48.0 °C
27 July 2011
Coldest feels-like
-16.3 °C
20 January 1964
Snowiest day
9.2 cm
24 January 1974
Sunniest day
13.9 h
1 July 1949
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 | 15.6 °C | +2.3 °C | 25 mm | -57 mm |
| Feb | 14.4 °C | -0.8 °C | 29 mm | -39 mm |
| Mar | 21.5 °C | +2.0 °C | 93 mm | +19 mm |
| Apr | 29.7 °C | +3.7 °C | 12 mm | -26 mm |
| May | 38.4 °C | +4.9 °C | 4 mm | -7 mm |
| Jun | 41.2 °C | +1.7 °C | 0 mm | -0 mm |
| Jul | 43.2 °C | +1.3 °C | 0 mm | -0 mm |
| Aug | 43.8 °C | +2.3 °C | 1 mm | +1 mm |
| Sep | 38.6 °C | +0.7 °C | 0 mm | -0 mm |
| Oct | 33.4 °C | +2.5 °C | 0 mm | -12 mm |
| Nov | 26.4 °C | +4.8 °C | 6 mm | -46 mm |
| Dec | 16.0 °C | +0.5 °C | 126 mm | +49 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 Dehlorān?
Dehlorān has a hot semi-arid climate (Köppen BSh). Over 1940-2025, the average annual temperature is 21.8 °C and it receives 411 mm of precipitation per year.
What is the hottest day ever recorded in Dehlorān?
The hottest day measured in Dehlorān between 1940 and 2025 was 30 July 2020, reaching 47.8 °C.
What is the coldest day in Dehlorān?
The coldest day measured in Dehlorān between 1940 and 2025 was 20 January 1964, at -11.0 °C.
Does it snow in Dehlorān?
Almost never: Dehlorān sees virtually no snow, with about 6 frost days per year.
Has the climate of Dehlorān warmed?
Yes: Dehlorān warmed by +2.4 °C between 1940 and 2025, a statistically significant trend.
What is the wettest day in Dehlorān?
The wettest day measured in Dehlorān between 1940 and 2025 was 2 February 1993, with 96 mm of rain in 24 hours.
What was the windiest day in Dehlorān?
The windiest day measured in Dehlorān between 1940 and 2025 was 8 February 1969, with winds reaching 36.0 km/h.
What is the warmest month in Dehlorān?
The warmest month in Dehlorān is July (34.8 °C on average); the coldest is January (8.5 °C).
How much does it rain in Dehlorān?
Dehlorān receives on average 411 mm of precipitation per year, spread over about 44 rainy days.
Is it sunny in Dehlorān?
Dehlorān gets on average 11.0 hours of sunshine per day, roughly 4,015 hours per year over 1940-2025.
What is the biggest single-day snowfall in Dehlorān?
The heaviest 24-hour snowfall measured in Dehlorān between 1940 and 2025 was 24 January 1974, with 9.2 cm.
Are there tropical nights in Dehlorān?
Yes: Dehlorān has on average 142 tropical nights per year (temperature staying above 20 °C), over 1940-2025.
What was the most extreme apparent temperature in Dehlorān?
In Dehlorān, between 1940 and 2025, the highest apparent temperature reached 48.0 °C on 27 July 2011, and the lowest was -16.3 °C on 20 January 1964.
Compare Dehlorān with another city
Pick a second city: its normals will be set against these, indicator by indicator.
Nearby cities
The climate around Dehlorān