Lāhījān climate — normals and trends
Lāhījān (Iran) has a humid subtropical climate (Cfa) under the Köppen-Geiger classification. Its mean annual temperature is 15.6 °C and it receives 1,262 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 (25.1 °C on average) and the coldest is January (6.1 °C). Rainfall peaks in October.
Lāhījān averages 20 frost days, 36 hot days (≥ 30 °C) and 141 rainy days per year.
Lāhījān has warmed by +2.4 °C between 1940 and 2025, or +0.28 °C per decade. This trend is statistically significant.
The number of frost days there went from about 29 to 11 per year over the period.
The hottest day of the period reached 37.3 °C (on 31 July 2011) and the coldest -12.1 °C (on 20 January 1964).
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
LāhījānGilan Province
- coords
- 37.20°, 50.01°
- period
- 1940–2025 · 86 yrs
Mean daily temperature
15.6°C
Average daily high
20.1°C
Average daily low
11.5°C
Annual rainfall
1,262mm
Sunshine / day
9.4h
Mean relative humidity
79%
Average peak wind
12.0km/h
Seasonal range
19.0°C
Frost days (< 0 °C)
20 d/yr
Hot days (≥ 30 °C)
36 d/yr
Rainy days (≥ 1 mm)
141 d/yr
Annual snowfall
45.0 cm
Average feels-like high
20.9 °C
Average feels-like low
10.7 °C
Average peak gust
27.5 km/h
Tropical nights (≥ 20 °C)
56 d/yr
Solar radiation
15.6 MJ/m²
Has the climate changed?
One stripe per year, 1940 to 2025
+2.4 °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
37.3 °C
31 July 2011
Coldest day
-12.1 °C
20 January 1964
Wettest day
90 mm
17 September 2006
Windiest day
40.5 km/h
4 February 1954
Strongest gust
85.3 km/h
4 February 1954
Hottest feels-like
43.4 °C
2 August 2000
Coldest feels-like
-17.3 °C
20 January 1964
Snowiest day
36.1 cm
11 February 2020
Sunniest day
14.0 h
30 June 1946
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 | 13.4 °C | +2.4 °C | 90 mm | -23 mm |
| Feb | 10.4 °C | -1.0 °C | 195 mm | +82 mm |
| Mar | 17.2 °C | +3.2 °C | 123 mm | +7 mm |
| Apr | 21.1 °C | +2.6 °C | 92 mm | +19 mm |
| May | 24.1 °C | +1.0 °C | 28 mm | -29 mm |
| Jun | 28.2 °C | +1.1 °C | 33 mm | -26 mm |
| Jul | 31.5 °C | +2.3 °C | 32 mm | -31 mm |
| Aug | 32.0 °C | +2.9 °C | 53 mm | -28 mm |
| Sep | 26.0 °C | +0.4 °C | 214 mm | +74 mm |
| Oct | 23.3 °C | +1.8 °C | 132 mm | -45 mm |
| Nov | 20.6 °C | +3.5 °C | 14 mm | -136 mm |
| Dec | 14.8 °C | +1.7 °C | 185 mm | +62 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 Lāhījān?
Lāhījān has a humid subtropical climate (Köppen Cfa). Over 1940-2025, the average annual temperature is 15.6 °C and it receives 1,262 mm of precipitation per year.
What is the hottest day ever recorded in Lāhījān?
The hottest day measured in Lāhījān between 1940 and 2025 was 31 July 2011, reaching 37.3 °C.
What is the coldest day in Lāhījān?
The coldest day measured in Lāhījān between 1940 and 2025 was 20 January 1964, at -12.1 °C.
Does it snow in Lāhījān?
Yes. Lāhījān gets on average 45.0 cm of snow per year and has around 20 frost days.
Has the climate of Lāhījān warmed?
Yes: Lāhījān warmed by +2.4 °C between 1940 and 2025, a statistically significant trend.
What is the wettest day in Lāhījān?
The wettest day measured in Lāhījān between 1940 and 2025 was 17 September 2006, with 90 mm of rain in 24 hours.
What was the windiest day in Lāhījān?
The windiest day measured in Lāhījān between 1940 and 2025 was 4 February 1954, with winds reaching 40.5 km/h.
What is the warmest month in Lāhījān?
The warmest month in Lāhījān is July (25.1 °C on average); the coldest is January (6.1 °C).
How much does it rain in Lāhījān?
Lāhījān receives on average 1,262 mm of precipitation per year, spread over about 141 rainy days.
Is it sunny in Lāhījān?
Lāhījān gets on average 9.4 hours of sunshine per day, roughly 3,431 hours per year over 1940-2025.
What is the biggest single-day snowfall in Lāhījān?
The heaviest 24-hour snowfall measured in Lāhījān between 1940 and 2025 was 11 February 2020, with 36.1 cm.
Are there tropical nights in Lāhījān?
Yes: Lāhījān has on average 56 tropical nights per year (temperature staying above 20 °C), over 1940-2025.
What was the most extreme apparent temperature in Lāhījān?
In Lāhījān, between 1940 and 2025, the highest apparent temperature reached 43.4 °C on 2 August 2000, and the lowest was -17.3 °C on 20 January 1964.
Compare Lāhījān with another city
Pick a second city: its normals will be set against these, indicator by indicator.
Nearby cities
The climate around Lāhījān