Zīr Āb climate — normals and trends
Zīr Āb (Iran) has a humid subtropical climate (Cfa) under the Köppen-Geiger classification. Its mean annual temperature is 12.7 °C and it receives 1,083 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 August (22.3 °C on average) and the coldest is January (2.0 °C). Rainfall peaks in October.
Zīr Āb averages 72 frost days, 9 hot days (≥ 30 °C) and 155 rainy days per year.
Zīr Āb has warmed by +3.1 °C between 1940 and 2025, or +0.36 °C per decade. This trend is statistically significant.
The number of frost days there went from about 97 to 47 per year over the period.
The hottest day of the period reached 35.5 °C (on 17 September 1979) and the coldest -20.4 °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
Zīr ĀbMazandaran
- coords
- 36.18°, 52.97°
- period
- 1940–2025 · 86 yrs
Mean daily temperature
12.7°C
Average daily high
17.8°C
Average daily low
8.0°C
Annual rainfall
1,083mm
Sunshine / day
8.8h
Mean relative humidity
79%
Average peak wind
9.7km/h
Seasonal range
20.3°C
Frost days (< 0 °C)
72 d/yr
Hot days (≥ 30 °C)
9 d/yr
Rainy days (≥ 1 mm)
155 d/yr
Annual snowfall
79.6 cm
Average feels-like high
18.2 °C
Average feels-like low
6.6 °C
Average peak gust
26.0 km/h
Tropical nights (≥ 20 °C)
15 d/yr
Solar radiation
15.6 MJ/m²
Has the climate changed?
One stripe per year, 1940 to 2025
+3.1 °C
since 1940
+0.4 °C per decade · r² = 0.57 · 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
35.5 °C
17 September 1979
Coldest day
-20.4 °C
20 January 1964
Wettest day
91 mm
24 September 2005
Windiest day
26.0 km/h
14 December 2024
Strongest gust
71.3 km/h
6 April 2014
Hottest feels-like
40.4 °C
3 August 2000
Coldest feels-like
-25.4 °C
20 January 1964
Snowiest day
20.3 cm
13 January 1998
Sunniest day
13.3 h
24 June 2021
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 | 10.6 °C | +2.3 °C | 52 mm | -14 mm |
| Feb | 7.8 °C | -1.3 °C | 74 mm | +1 mm |
| Mar | 15.3 °C | +3.2 °C | 72 mm | -25 mm |
| Apr | 20.7 °C | +3.7 °C | 70 mm | -30 mm |
| May | 23.1 °C | +2.2 °C | 65 mm | -47 mm |
| Jun | 24.3 °C | +0.3 °C | 47 mm | -26 mm |
| Jul | 28.7 °C | +2.6 °C | 28 mm | -35 mm |
| Aug | 30.1 °C | +3.4 °C | 46 mm | -36 mm |
| Sep | 24.7 °C | +0.9 °C | 117 mm | -7 mm |
| Oct | 22.5 °C | +2.7 °C | 69 mm | -57 mm |
| Nov | 19.2 °C | +4.3 °C | 32 mm | -63 mm |
| Dec | 12.3 °C | +1.8 °C | 93 mm | +19 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 Zīr Āb?
Zīr Āb has a humid subtropical climate (Köppen Cfa). Over 1940-2025, the average annual temperature is 12.7 °C and it receives 1,083 mm of precipitation per year.
What is the hottest day ever recorded in Zīr Āb?
The hottest day measured in Zīr Āb between 1940 and 2025 was 17 September 1979, reaching 35.5 °C.
What is the coldest day in Zīr Āb?
The coldest day measured in Zīr Āb between 1940 and 2025 was 20 January 1964, at -20.4 °C.
Does it snow in Zīr Āb?
Yes. Zīr Āb gets on average 79.6 cm of snow per year and has around 72 frost days.
Has the climate of Zīr Āb warmed?
Yes: Zīr Āb warmed by +3.1 °C between 1940 and 2025, a statistically significant trend.
What is the wettest day in Zīr Āb?
The wettest day measured in Zīr Āb between 1940 and 2025 was 24 September 2005, with 91 mm of rain in 24 hours.
What was the windiest day in Zīr Āb?
The windiest day measured in Zīr Āb between 1940 and 2025 was 14 December 2024, with winds reaching 26.0 km/h.
What is the warmest month in Zīr Āb?
The warmest month in Zīr Āb is August (22.3 °C on average); the coldest is January (2.0 °C).
How much does it rain in Zīr Āb?
Zīr Āb receives on average 1,083 mm of precipitation per year, spread over about 155 rainy days.
Is it sunny in Zīr Āb?
Zīr Āb gets on average 8.8 hours of sunshine per day, roughly 3,212 hours per year over 1940-2025.
What is the biggest single-day snowfall in Zīr Āb?
The heaviest 24-hour snowfall measured in Zīr Āb between 1940 and 2025 was 13 January 1998, with 20.3 cm.
Are there tropical nights in Zīr Āb?
Yes: Zīr Āb has on average 15 tropical nights per year (temperature staying above 20 °C), over 1940-2025.
What was the most extreme apparent temperature in Zīr Āb?
In Zīr Āb, between 1940 and 2025, the highest apparent temperature reached 40.4 °C on 3 August 2000, and the lowest was -25.4 °C on 20 January 1964.
Compare Zīr Āb with another city
Pick a second city: its normals will be set against these, indicator by indicator.
Nearby cities
The climate around Zīr Āb