Zanjan climate — normals and trends
Zanjan (Iran) has a warm-summer mediterranean continental climate (Dsb) under the Köppen-Geiger classification. Its mean annual temperature is 8.3 °C and it receives 454 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 (19.6 °C on average) and the coldest is January (-5.7 °C). Rainfall peaks in April.
Zanjan averages 135 frost days, 28 hot days (≥ 30 °C) and 92 rainy days per year.
Zanjan has warmed by +4.4 °C between 1940 and 2025, or +0.52 °C per decade. This trend is statistically significant.
The number of frost days there went from about 157 to 113 per year over the period.
The hottest day of the period reached 38.9 °C (on 21 August 2025) and the coldest -28.6 °C (on 14 January 1940).
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
ZanjanZanjan
- coords
- 36.68°, 48.50°
- period
- 1940–2025 · 86 yrs
Mean daily temperature
8.3°C
Average daily high
15.0°C
Average daily low
2.6°C
Annual rainfall
454mm
Sunshine / day
10.5h
Mean relative humidity
67%
Average peak wind
14.3km/h
Seasonal range
25.3°C
Frost days (< 0 °C)
135 d/yr
Hot days (≥ 30 °C)
28 d/yr
Rainy days (≥ 1 mm)
92 d/yr
Annual snowfall
116.2 cm
Average feels-like high
12.2 °C
Average feels-like low
-0.2 °C
Average peak gust
35.1 km/h
Tropical nights (≥ 20 °C)
0 d/yr
Solar radiation
18.4 MJ/m²
Has the climate changed?
One stripe per year, 1940 to 2025
+4.4 °C
since 1940
+0.5 °C per decade · r² = 0.60 · 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
38.9 °C
21 August 2025
Coldest day
-28.6 °C
14 January 1940
Wettest day
39 mm
24 April 2020
Windiest day
50.7 km/h
13 November 1981
Strongest gust
114.5 km/h
16 March 2010
Hottest feels-like
37.1 °C
31 July 1976
Coldest feels-like
-34.3 °C
14 January 1940
Snowiest day
23.4 cm
13 March 2014
Sunniest day
14.0 h
9 June 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 | 4.3 °C | +4.8 °C | 19 mm | -22 mm |
| Feb | 2.0 °C | +0.5 °C | 46 mm | -1 mm |
| Mar | 12.5 °C | +5.4 °C | 66 mm | -2 mm |
| Apr | 17.6 °C | +3.1 °C | 73 mm | -6 mm |
| May | 24.7 °C | +4.6 °C | 33 mm | -29 mm |
| Jun | 27.2 °C | +2.0 °C | 3 mm | -13 mm |
| Jul | 29.7 °C | +1.9 °C | 6 mm | -2 mm |
| Aug | 31.7 °C | +3.7 °C | 2 mm | -4 mm |
| Sep | 25.8 °C | +0.9 °C | 2 mm | -5 mm |
| Oct | 22.5 °C | +4.2 °C | 1 mm | -32 mm |
| Nov | 15.6 °C | +5.7 °C | 6 mm | -40 mm |
| Dec | 6.3 °C | +3.4 °C | 66 mm | +26 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 Zanjan?
Zanjan has a warm-summer mediterranean continental climate (Köppen Dsb). Over 1940-2025, the average annual temperature is 8.3 °C and it receives 454 mm of precipitation per year.
What is the hottest day ever recorded in Zanjan?
The hottest day measured in Zanjan between 1940 and 2025 was 21 August 2025, reaching 38.9 °C.
What is the coldest day in Zanjan?
The coldest day measured in Zanjan between 1940 and 2025 was 14 January 1940, at -28.6 °C.
Does it snow in Zanjan?
Yes. Zanjan gets on average 116.2 cm of snow per year and has around 135 frost days.
Has the climate of Zanjan warmed?
Yes: Zanjan warmed by +4.4 °C between 1940 and 2025, a statistically significant trend.
What is the wettest day in Zanjan?
The wettest day measured in Zanjan between 1940 and 2025 was 24 April 2020, with 39 mm of rain in 24 hours.
What was the windiest day in Zanjan?
The windiest day measured in Zanjan between 1940 and 2025 was 13 November 1981, with winds reaching 50.7 km/h.
What is the warmest month in Zanjan?
The warmest month in Zanjan is July (19.6 °C on average); the coldest is January (-5.7 °C).
How much does it rain in Zanjan?
Zanjan receives on average 454 mm of precipitation per year, spread over about 92 rainy days.
Is it sunny in Zanjan?
Zanjan 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 Zanjan?
The heaviest 24-hour snowfall measured in Zanjan between 1940 and 2025 was 13 March 2014, with 23.4 cm.
Are there tropical nights in Zanjan?
Almost never: tropical nights (temperature staying above 20 °C) are virtually non-existent in Zanjan.
What was the most extreme apparent temperature in Zanjan?
In Zanjan, between 1940 and 2025, the highest apparent temperature reached 37.1 °C on 31 July 1976, and the lowest was -34.3 °C on 14 January 1940.
Compare Zanjan with another city
Pick a second city: its normals will be set against these, indicator by indicator.
Nearby cities
The climate around Zanjan