Ardestān climate — normals and trends
Ardestān (Iran) has a hot desert climate (BWh) under the Köppen-Geiger classification. Its mean annual temperature is 18.7 °C and it receives 141 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 (31.5 °C on average) and the coldest is January (5.0 °C). Rainfall peaks in March.
Ardestān averages 33 frost days, 141 hot days (≥ 30 °C) and 30 rainy days per year.
Ardestān has warmed by +2.8 °C between 1940 and 2025, or +0.32 °C per decade. This trend is statistically significant.
The number of frost days there went from about 44 to 22 per year over the period.
The hottest day of the period reached 44.8 °C (on 26 July 2013) and the coldest -16.9 °C (on 1 January 1949).
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
ArdestānIsfahan
- coords
- 33.38°, 52.37°
- period
- 1940–2025 · 86 yrs
Mean daily temperature
18.7°C
Average daily high
24.7°C
Average daily low
12.6°C
Annual rainfall
141mm
Sunshine / day
11.0h
Mean relative humidity
35%
Average peak wind
14.5km/h
Seasonal range
26.5°C
Frost days (< 0 °C)
33 d/yr
Hot days (≥ 30 °C)
141 d/yr
Rainy days (≥ 1 mm)
30 d/yr
Annual snowfall
14.7 cm
Average feels-like high
21.9 °C
Average feels-like low
9.5 °C
Average peak gust
29.5 km/h
Tropical nights (≥ 20 °C)
107 d/yr
Solar radiation
20.6 MJ/m²
Has the climate changed?
One stripe per year, 1940 to 2025
+2.8 °C
since 1940
+0.3 °C per decade · r² = 0.52 · 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
44.8 °C
26 July 2013
Coldest day
-16.9 °C
1 January 1949
Wettest day
32 mm
14 April 2012
Windiest day
47.3 km/h
24 December 1947
Strongest gust
85.7 km/h
24 December 1947
Hottest feels-like
42.9 °C
1 July 1978
Coldest feels-like
-22.6 °C
1 January 1949
Snowiest day
12.2 cm
13 March 1960
Sunniest day
13.1 h
23 June 1943
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 | 11.5 °C | +0.7 °C | 21 mm | -2 mm |
| Feb | 13.5 °C | -0.1 °C | 5 mm | -15 mm |
| Mar | 20.2 °C | +1.7 °C | 31 mm | +2 mm |
| Apr | 29.4 °C | +5.0 °C | 10 mm | -11 mm |
| May | 35.1 °C | +4.9 °C | 1 mm | -7 mm |
| Jun | 36.6 °C | +1.1 °C | 2 mm | +1 mm |
| Jul | 39.3 °C | +1.7 °C | 0 mm | -0 mm |
| Aug | 38.3 °C | +1.9 °C | 0 mm | -0 mm |
| Sep | 35.2 °C | +2.4 °C | 0 mm | -0 mm |
| Oct | 30.2 °C | +4.0 °C | 0 mm | -4 mm |
| Nov | 22.1 °C | +4.1 °C | 0 mm | -15 mm |
| Dec | 13.5 °C | +1.0 °C | 67 mm | +48 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 Ardestān?
Ardestān has a hot desert climate (Köppen BWh). Over 1940-2025, the average annual temperature is 18.7 °C and it receives 141 mm of precipitation per year.
What is the hottest day ever recorded in Ardestān?
The hottest day measured in Ardestān between 1940 and 2025 was 26 July 2013, reaching 44.8 °C.
What is the coldest day in Ardestān?
The coldest day measured in Ardestān between 1940 and 2025 was 1 January 1949, at -16.9 °C.
Does it snow in Ardestān?
Yes. Ardestān gets on average 14.7 cm of snow per year and has around 33 frost days.
Has the climate of Ardestān warmed?
Yes: Ardestān warmed by +2.8 °C between 1940 and 2025, a statistically significant trend.
What is the wettest day in Ardestān?
The wettest day measured in Ardestān between 1940 and 2025 was 14 April 2012, with 32 mm of rain in 24 hours.
What was the windiest day in Ardestān?
The windiest day measured in Ardestān between 1940 and 2025 was 24 December 1947, with winds reaching 47.3 km/h.
What is the warmest month in Ardestān?
The warmest month in Ardestān is July (31.5 °C on average); the coldest is January (5.0 °C).
How much does it rain in Ardestān?
Ardestān receives on average 141 mm of precipitation per year, spread over about 30 rainy days.
Is it sunny in Ardestān?
Ardestān 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 Ardestān?
The heaviest 24-hour snowfall measured in Ardestān between 1940 and 2025 was 13 March 1960, with 12.2 cm.
Are there tropical nights in Ardestān?
Yes: Ardestān has on average 107 tropical nights per year (temperature staying above 20 °C), over 1940-2025.
What was the most extreme apparent temperature in Ardestān?
In Ardestān, between 1940 and 2025, the highest apparent temperature reached 42.9 °C on 1 July 1978, and the lowest was -22.6 °C on 1 January 1949.
Compare Ardestān with another city
Pick a second city: its normals will be set against these, indicator by indicator.
Nearby cities
The climate around Ardestān