Bojnourd climate — normals and trends
Bojnourd (Iran) has a cold semi-arid climate (BSk) under the Köppen-Geiger classification. Its mean annual temperature is 11.6 °C and it receives 353 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 (23.9 °C on average) and the coldest is January (-1.4 °C). Rainfall peaks in March.
Bojnourd averages 107 frost days, 56 hot days (≥ 30 °C) and 67 rainy days per year.
Bojnourd has warmed by +2.7 °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 127 to 87 per year over the period.
The hottest day of the period reached 39.4 °C (on 21 July 2014) and the coldest -23.8 °C (on 17 January 1950).
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
BojnourdNorth Khorasan
- coords
- 37.47°, 57.33°
- period
- 1940–2025 · 86 yrs
Mean daily temperature
11.6°C
Average daily high
18.1°C
Average daily low
5.6°C
Annual rainfall
353mm
Sunshine / day
10.5h
Mean relative humidity
59%
Average peak wind
11.9km/h
Seasonal range
25.3°C
Frost days (< 0 °C)
107 d/yr
Hot days (≥ 30 °C)
56 d/yr
Rainy days (≥ 1 mm)
67 d/yr
Annual snowfall
64.1 cm
Average feels-like high
16.3 °C
Average feels-like low
2.9 °C
Average peak gust
29.9 km/h
Tropical nights (≥ 20 °C)
5 d/yr
Solar radiation
18.4 MJ/m²
Has the climate changed?
One stripe per year, 1940 to 2025
+2.7 °C
since 1940
+0.3 °C per decade · r² = 0.36 · 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
39.4 °C
21 July 2014
Coldest day
-23.8 °C
17 January 1950
Wettest day
39 mm
6 May 2005
Windiest day
28.4 km/h
4 March 2022
Strongest gust
77.0 km/h
21 December 2021
Hottest feels-like
40.9 °C
13 July 1995
Coldest feels-like
-29.5 °C
17 January 1950
Snowiest day
17.3 cm
20 February 1951
Sunniest day
14.0 h
29 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 | 7.6 °C | +3.4 °C | 10 mm | -26 mm |
| Feb | 5.5 °C | -0.1 °C | 35 mm | -10 mm |
| Mar | 14.5 °C | +3.6 °C | 28 mm | -41 mm |
| Apr | 21.7 °C | +4.1 °C | 30 mm | -32 mm |
| May | 26.7 °C | +3.8 °C | 17 mm | -27 mm |
| Jun | 28.4 °C | +0.2 °C | 16 mm | +5 mm |
| Jul | 32.8 °C | +1.8 °C | 0 mm | -4 mm |
| Aug | 32.0 °C | +1.8 °C | 2 mm | -2 mm |
| Sep | 27.7 °C | +1.1 °C | 4 mm | -2 mm |
| Oct | 23.6 °C | +3.5 °C | 0 mm | -17 mm |
| Nov | 17.1 °C | +4.1 °C | 0 mm | -26 mm |
| Dec | 8.8 °C | +1.7 °C | 46 mm | +16 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 Bojnourd?
Bojnourd has a cold semi-arid climate (Köppen BSk). Over 1940-2025, the average annual temperature is 11.6 °C and it receives 353 mm of precipitation per year.
What is the hottest day ever recorded in Bojnourd?
The hottest day measured in Bojnourd between 1940 and 2025 was 21 July 2014, reaching 39.4 °C.
What is the coldest day in Bojnourd?
The coldest day measured in Bojnourd between 1940 and 2025 was 17 January 1950, at -23.8 °C.
Does it snow in Bojnourd?
Yes. Bojnourd gets on average 64.1 cm of snow per year and has around 107 frost days.
Has the climate of Bojnourd warmed?
Yes: Bojnourd warmed by +2.7 °C between 1940 and 2025, a statistically significant trend.
What is the wettest day in Bojnourd?
The wettest day measured in Bojnourd between 1940 and 2025 was 6 May 2005, with 39 mm of rain in 24 hours.
What was the windiest day in Bojnourd?
The windiest day measured in Bojnourd between 1940 and 2025 was 4 March 2022, with winds reaching 28.4 km/h.
What is the warmest month in Bojnourd?
The warmest month in Bojnourd is July (23.9 °C on average); the coldest is January (-1.4 °C).
How much does it rain in Bojnourd?
Bojnourd receives on average 353 mm of precipitation per year, spread over about 67 rainy days.
Is it sunny in Bojnourd?
Bojnourd gets on average 10.5 hours of sunshine per day, roughly 3,833 hours per year over 1940-2025.
What is the biggest single-day snowfall in Bojnourd?
The heaviest 24-hour snowfall measured in Bojnourd between 1940 and 2025 was 20 February 1951, with 17.3 cm.
Are there tropical nights in Bojnourd?
Yes: Bojnourd has on average 5 tropical nights per year (temperature staying above 20 °C), over 1940-2025.
What was the most extreme apparent temperature in Bojnourd?
In Bojnourd, between 1940 and 2025, the highest apparent temperature reached 40.9 °C on 13 July 1995, and the lowest was -29.5 °C on 17 January 1950.
Compare Bojnourd with another city
Pick a second city: its normals will be set against these, indicator by indicator.
Nearby cities
The climate around Bojnourd