Bonāb climate — normals and trends
Bonāb (Iran) has a cold semi-arid climate (BSk) under the Köppen-Geiger classification. Its mean annual temperature is 13.4 °C and it receives 224 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 (27.4 °C on average) and the coldest is January (-0.9 °C). Rainfall peaks in March.
Bonāb averages 89 frost days, 94 hot days (≥ 30 °C) and 51 rainy days per year.
Bonāb has warmed by +3.1 °C between 1940 and 2025, or +0.37 °C per decade. This trend is statistically significant.
The number of frost days there went from about 108 to 70 per year over the period.
The hottest day of the period reached 42.3 °C (on 12 July 2018) and the coldest -24.8 °C (on 3 March 1985).
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
BonābEast Azerbaijan Province
- coords
- 37.34°, 46.06°
- period
- 1940–2025 · 86 yrs
Mean daily temperature
13.4°C
Average daily high
19.9°C
Average daily low
7.6°C
Annual rainfall
224mm
Sunshine / day
11.1h
Mean relative humidity
51%
Average peak wind
15.7km/h
Seasonal range
28.3°C
Frost days (< 0 °C)
89 d/yr
Hot days (≥ 30 °C)
94 d/yr
Rainy days (≥ 1 mm)
51 d/yr
Annual snowfall
27.8 cm
Average feels-like high
17.6 °C
Average feels-like low
4.6 °C
Average peak gust
32.7 km/h
Tropical nights (≥ 20 °C)
33 d/yr
Solar radiation
19.3 MJ/m²
Has the climate changed?
One stripe per year, 1940 to 2025
+3.1 °C
since 1940
+0.4 °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
42.3 °C
12 July 2018
Coldest day
-24.8 °C
3 March 1985
Wettest day
39 mm
6 November 1994
Windiest day
45.0 km/h
19 March 1997
Strongest gust
101.2 km/h
19 March 1997
Hottest feels-like
43.0 °C
12 July 2018
Coldest feels-like
-29.5 °C
3 March 1985
Snowiest day
12.1 cm
7 February 1972
Sunniest day
14.0 h
19 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 | 6.7 °C | +2.3 °C | 4 mm | -21 mm |
| Feb | 6.6 °C | -0.3 °C | 36 mm | +8 mm |
| Mar | 16.1 °C | +3.9 °C | 22 mm | -19 mm |
| Apr | 21.7 °C | +3.0 °C | 32 mm | -9 mm |
| May | 28.1 °C | +3.2 °C | 24 mm | +1 mm |
| Jun | 31.9 °C | +1.1 °C | 0 mm | -4 mm |
| Jul | 35.7 °C | +1.4 °C | 0 mm | -1 mm |
| Aug | 38.0 °C | +4.1 °C | 0 mm | -1 mm |
| Sep | 30.0 °C | +0.6 °C | 0 mm | -1 mm |
| Oct | 25.1 °C | +3.0 °C | 0 mm | -10 mm |
| Nov | 17.0 °C | +3.3 °C | 11 mm | -13 mm |
| Dec | 9.1 °C | +2.1 °C | 55 mm | +29 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 Bonāb?
Bonāb has a cold semi-arid climate (Köppen BSk). Over 1940-2025, the average annual temperature is 13.4 °C and it receives 224 mm of precipitation per year.
What is the hottest day ever recorded in Bonāb?
The hottest day measured in Bonāb between 1940 and 2025 was 12 July 2018, reaching 42.3 °C.
What is the coldest day in Bonāb?
The coldest day measured in Bonāb between 1940 and 2025 was 3 March 1985, at -24.8 °C.
Does it snow in Bonāb?
Yes. Bonāb gets on average 27.8 cm of snow per year and has around 89 frost days.
Has the climate of Bonāb warmed?
Yes: Bonāb warmed by +3.1 °C between 1940 and 2025, a statistically significant trend.
What is the wettest day in Bonāb?
The wettest day measured in Bonāb between 1940 and 2025 was 6 November 1994, with 39 mm of rain in 24 hours.
What was the windiest day in Bonāb?
The windiest day measured in Bonāb between 1940 and 2025 was 19 March 1997, with winds reaching 45.0 km/h.
What is the warmest month in Bonāb?
The warmest month in Bonāb is July (27.4 °C on average); the coldest is January (-0.9 °C).
How much does it rain in Bonāb?
Bonāb receives on average 224 mm of precipitation per year, spread over about 51 rainy days.
Is it sunny in Bonāb?
Bonāb 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 Bonāb?
The heaviest 24-hour snowfall measured in Bonāb between 1940 and 2025 was 7 February 1972, with 12.1 cm.
Are there tropical nights in Bonāb?
Yes: Bonāb has on average 33 tropical nights per year (temperature staying above 20 °C), over 1940-2025.
What was the most extreme apparent temperature in Bonāb?
In Bonāb, between 1940 and 2025, the highest apparent temperature reached 43.0 °C on 12 July 2018, and the lowest was -29.5 °C on 3 March 1985.
Compare Bonāb with another city
Pick a second city: its normals will be set against these, indicator by indicator.
Nearby cities
The climate around Bonāb