Nā’īn climate — normals and trends
Nā’īn (Iran) has a cold desert climate (BWk) under the Köppen-Geiger classification. Its mean annual temperature is 15.6 °C and it receives 154 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 (28.3 °C on average) and the coldest is January (2.2 °C). Rainfall peaks in March.
Nā’īn averages 59 frost days, 98 hot days (≥ 30 °C) and 37 rainy days per year.
Nā’īn has warmed by +2.6 °C between 1940 and 2025, or +0.30 °C per decade. This trend is statistically significant.
The number of frost days there went from about 71 to 47 per year over the period.
The hottest day of the period reached 41.0 °C (on 27 July 2024) and the coldest -18.6 °C (on 16 January 2008).
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
Nā’īnIsfahan
- coords
- 32.86°, 53.09°
- period
- 1940–2025 · 86 yrs
Mean daily temperature
15.6°C
Average daily high
21.2°C
Average daily low
10.1°C
Annual rainfall
154mm
Sunshine / day
11.1h
Mean relative humidity
34%
Average peak wind
20.3km/h
Seasonal range
26.1°C
Frost days (< 0 °C)
59 d/yr
Hot days (≥ 30 °C)
98 d/yr
Rainy days (≥ 1 mm)
37 d/yr
Annual snowfall
24.9 cm
Average feels-like high
17.5 °C
Average feels-like low
6.0 °C
Average peak gust
38.2 km/h
Tropical nights (≥ 20 °C)
63 d/yr
Solar radiation
21.1 MJ/m²
Has the climate changed?
One stripe per year, 1940 to 2025
+2.6 °C
since 1940
+0.3 °C per decade · r² = 0.51 · 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
41.0 °C
27 July 2024
Coldest day
-18.6 °C
16 January 2008
Wettest day
28 mm
15 March 2004
Windiest day
60.5 km/h
11 March 2022
Strongest gust
111.6 km/h
1 February 1994
Hottest feels-like
40.3 °C
27 July 2024
Coldest feels-like
-24.4 °C
16 January 2008
Snowiest day
12.9 cm
15 January 1956
Sunniest day
13.0 h
4 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 | 8.5 °C | +1.0 °C | 21 mm | +1 mm |
| Feb | 10.4 °C | +0.2 °C | 9 mm | -11 mm |
| Mar | 17.0 °C | +1.9 °C | 40 mm | +11 mm |
| Apr | 26.0 °C | +5.1 °C | 11 mm | -17 mm |
| May | 31.7 °C | +5.0 °C | 6 mm | -11 mm |
| Jun | 33.4 °C | +1.4 °C | 4 mm | +2 mm |
| Jul | 35.7 °C | +1.9 °C | 2 mm | +2 mm |
| Aug | 34.4 °C | +2.0 °C | 0 mm | -0 mm |
| Sep | 31.9 °C | +2.8 °C | 0 mm | -0 mm |
| Oct | 26.9 °C | +4.2 °C | 0 mm | -6 mm |
| Nov | 18.6 °C | +3.7 °C | 1 mm | -14 mm |
| Dec | 10.5 °C | +1.0 °C | 52 mm | +35 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 Nā’īn?
Nā’īn has a cold desert climate (Köppen BWk). Over 1940-2025, the average annual temperature is 15.6 °C and it receives 154 mm of precipitation per year.
What is the hottest day ever recorded in Nā’īn?
The hottest day measured in Nā’īn between 1940 and 2025 was 27 July 2024, reaching 41.0 °C.
What is the coldest day in Nā’īn?
The coldest day measured in Nā’īn between 1940 and 2025 was 16 January 2008, at -18.6 °C.
Does it snow in Nā’īn?
Yes. Nā’īn gets on average 24.9 cm of snow per year and has around 59 frost days.
Has the climate of Nā’īn warmed?
Yes: Nā’īn warmed by +2.6 °C between 1940 and 2025, a statistically significant trend.
What is the wettest day in Nā’īn?
The wettest day measured in Nā’īn between 1940 and 2025 was 15 March 2004, with 28 mm of rain in 24 hours.
What was the windiest day in Nā’īn?
The windiest day measured in Nā’īn between 1940 and 2025 was 11 March 2022, with winds reaching 60.5 km/h.
What is the warmest month in Nā’īn?
The warmest month in Nā’īn is July (28.3 °C on average); the coldest is January (2.2 °C).
How much does it rain in Nā’īn?
Nā’īn receives on average 154 mm of precipitation per year, spread over about 37 rainy days.
Is it sunny in Nā’īn?
Nā’īn 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 Nā’īn?
The heaviest 24-hour snowfall measured in Nā’īn between 1940 and 2025 was 15 January 1956, with 12.9 cm.
Are there tropical nights in Nā’īn?
Yes: Nā’īn has on average 63 tropical nights per year (temperature staying above 20 °C), over 1940-2025.
What was the most extreme apparent temperature in Nā’īn?
In Nā’īn, between 1940 and 2025, the highest apparent temperature reached 40.3 °C on 27 July 2024, and the lowest was -24.4 °C on 16 January 2008.
Compare Nā’īn with another city
Pick a second city: its normals will be set against these, indicator by indicator.
Nearby cities
The climate around Nā’īn