Giresun climate — normals and trends
Giresun (Republic of Türkiye) has a humid subtropical climate (Cfa) under the Köppen-Geiger classification. Its mean annual temperature is 14.3 °C and it receives 1,487 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 (22.7 °C on average) and the coldest is February (6.5 °C). Rainfall peaks in October.
Giresun averages 7 frost days, 0 hot days (≥ 30 °C) and 175 rainy days per year.
Giresun has warmed by +1.6 °C between 1940 and 2025, or +0.19 °C per decade. This trend is statistically significant.
The number of frost days there went from about 11 to 3 per year over the period.
The hottest day of the period reached 33.1 °C (on 6 June 1994) and the coldest -6.4 °C (on 22 February 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
GiresunGiresun
- coords
- 40.92°, 38.39°
- period
- 1940–2025 · 86 yrs
Mean daily temperature
14.3°C
Average daily high
16.6°C
Average daily low
12.3°C
Annual rainfall
1,487mm
Sunshine / day
9.3h
Mean relative humidity
79%
Average peak wind
14.1km/h
Seasonal range
16.2°C
Frost days (< 0 °C)
7 d/yr
Hot days (≥ 30 °C)
0 d/yr
Rainy days (≥ 1 mm)
175 d/yr
Annual snowfall
70.5 cm
Average feels-like high
16.6 °C
Average feels-like low
11.2 °C
Average peak gust
27.7 km/h
Tropical nights (≥ 20 °C)
50 d/yr
Solar radiation
14.3 MJ/m²
Has the climate changed?
One stripe per year, 1940 to 2025
+1.6 °C
since 1940
+0.2 °C per decade · r² = 0.32 · 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
33.1 °C
6 June 1994
Coldest day
-6.4 °C
22 February 1985
Wettest day
139 mm
9 August 2021
Windiest day
211.4 km/h
23 April 1997
Strongest gust
96.8 km/h
26 November 1964
Hottest feels-like
39.8 °C
30 July 2000
Coldest feels-like
-13.3 °C
23 April 1997
Snowiest day
22.8 cm
9 February 1975
Sunniest day
14.9 h
26 June 2025
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 | 12.2 °C | +3.3 °C | 84 mm | -49 mm |
| Feb | 7.1 °C | -1.8 °C | 168 mm | +61 mm |
| Mar | 14.6 °C | +4.2 °C | 91 mm | -23 mm |
| Apr | 13.2 °C | -1.1 °C | 170 mm | +61 mm |
| May | 18.5 °C | +0.5 °C | 145 mm | +39 mm |
| Jun | 21.7 °C | -0.2 °C | 80 mm | -14 mm |
| Jul | 25.8 °C | +1.6 °C | 61 mm | -19 mm |
| Aug | 25.9 °C | +1.3 °C | 51 mm | -51 mm |
| Sep | 22.0 °C | 0.0 °C | 175 mm | +27 mm |
| Oct | 19.6 °C | +0.9 °C | 224 mm | +30 mm |
| Nov | 18.8 °C | +3.5 °C | 124 mm | -42 mm |
| Dec | 12.4 °C | +1.0 °C | 213 mm | +77 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 Giresun?
Giresun has a humid subtropical climate (Köppen Cfa). Over 1940-2025, the average annual temperature is 14.3 °C and it receives 1,487 mm of precipitation per year.
What is the hottest day ever recorded in Giresun?
The hottest day measured in Giresun between 1940 and 2025 was 6 June 1994, reaching 33.1 °C.
What is the coldest day in Giresun?
The coldest day measured in Giresun between 1940 and 2025 was 22 February 1985, at -6.4 °C.
Does it snow in Giresun?
Yes. Giresun gets on average 70.5 cm of snow per year and has around 7 frost days.
Has the climate of Giresun warmed?
Yes: Giresun warmed by +1.6 °C between 1940 and 2025, a statistically significant trend.
What is the wettest day in Giresun?
The wettest day measured in Giresun between 1940 and 2025 was 9 August 2021, with 139 mm of rain in 24 hours.
What was the windiest day in Giresun?
The windiest day measured in Giresun between 1940 and 2025 was 23 April 1997, with winds reaching 211.4 km/h.
What is the warmest month in Giresun?
The warmest month in Giresun is August (22.7 °C on average); the coldest is February (6.5 °C).
How much does it rain in Giresun?
Giresun receives on average 1,487 mm of precipitation per year, spread over about 175 rainy days.
Is it sunny in Giresun?
Giresun gets on average 9.3 hours of sunshine per day, roughly 3,395 hours per year over 1940-2025.
What is the biggest single-day snowfall in Giresun?
The heaviest 24-hour snowfall measured in Giresun between 1940 and 2025 was 9 February 1975, with 22.8 cm.
Are there tropical nights in Giresun?
Yes: Giresun has on average 50 tropical nights per year (temperature staying above 20 °C), over 1940-2025.
What was the most extreme apparent temperature in Giresun?
In Giresun, between 1940 and 2025, the highest apparent temperature reached 39.8 °C on 30 July 2000, and the lowest was -13.3 °C on 23 April 1997.
Compare Giresun with another city
Pick a second city: its normals will be set against these, indicator by indicator.
Nearby cities
The climate around Giresun