Kastamonu climate — normals and trends
Kastamonu (Republic of Türkiye) has a warm-summer humid continental climate (Dfb) under the Köppen-Geiger classification. Its mean annual temperature is 9.0 °C and it receives 620 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 (19.1 °C on average) and the coldest is January (-1.7 °C). Rainfall peaks in May.
Kastamonu averages 109 frost days, 9 hot days (≥ 30 °C) and 125 rainy days per year.
Kastamonu 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 128 to 90 per year over the period.
The hottest day of the period reached 38.1 °C (on 29 July 2025) and the coldest -26.3 °C (on 17 January 1944).
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
KastamonuKastamonu
- coords
- 41.38°, 33.78°
- period
- 1940–2025 · 86 yrs
Mean daily temperature
9.0°C
Average daily high
14.3°C
Average daily low
4.2°C
Annual rainfall
620mm
Sunshine / day
9.3h
Mean relative humidity
73%
Average peak wind
11.6km/h
Seasonal range
20.8°C
Frost days (< 0 °C)
109 d/yr
Hot days (≥ 30 °C)
9 d/yr
Rainy days (≥ 1 mm)
125 d/yr
Annual snowfall
129.5 cm
Average feels-like high
12.4 °C
Average feels-like low
1.9 °C
Average peak gust
29.6 km/h
Tropical nights (≥ 20 °C)
0 d/yr
Solar radiation
15.0 MJ/m²
Has the climate changed?
One stripe per year, 1940 to 2025
+3.1 °C
since 1940
+0.4 °C per decade · r² = 0.56 · 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
38.1 °C
29 July 2025
Coldest day
-26.3 °C
17 January 1944
Wettest day
46 mm
6 July 1991
Windiest day
40.8 km/h
9 October 2003
Strongest gust
97.9 km/h
9 October 2003
Hottest feels-like
39.4 °C
30 July 2000
Coldest feels-like
-30.7 °C
17 January 1944
Snowiest day
26.3 cm
17 December 2003
Sunniest day
14.5 h
20 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 | 8.0 °C | +5.9 °C | 43 mm | -11 mm |
| Feb | 2.2 °C | -1.5 °C | 72 mm | +18 mm |
| Mar | 14.9 °C | +7.4 °C | 27 mm | -37 mm |
| Apr | 13.5 °C | 0.0 °C | 73 mm | +4 mm |
| May | 20.7 °C | +2.6 °C | 50 mm | -24 mm |
| Jun | 25.7 °C | +3.9 °C | 10 mm | -48 mm |
| Jul | 30.4 °C | +5.5 °C | 3 mm | -27 mm |
| Aug | 28.7 °C | +3.1 °C | 9 mm | -17 mm |
| Sep | 22.4 °C | +0.5 °C | 53 mm | +19 mm |
| Oct | 17.0 °C | +0.4 °C | 57 mm | +8 mm |
| Nov | 15.7 °C | +5.0 °C | 18 mm | -31 mm |
| Dec | 6.7 °C | +2.0 °C | 75 mm | +15 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 Kastamonu?
Kastamonu has a warm-summer humid continental climate (Köppen Dfb). Over 1940-2025, the average annual temperature is 9.0 °C and it receives 620 mm of precipitation per year.
What is the hottest day ever recorded in Kastamonu?
The hottest day measured in Kastamonu between 1940 and 2025 was 29 July 2025, reaching 38.1 °C.
What is the coldest day in Kastamonu?
The coldest day measured in Kastamonu between 1940 and 2025 was 17 January 1944, at -26.3 °C.
Does it snow in Kastamonu?
Yes. Kastamonu gets on average 129.5 cm of snow per year and has around 109 frost days.
Has the climate of Kastamonu warmed?
Yes: Kastamonu warmed by +3.1 °C between 1940 and 2025, a statistically significant trend.
What is the wettest day in Kastamonu?
The wettest day measured in Kastamonu between 1940 and 2025 was 6 July 1991, with 46 mm of rain in 24 hours.
What was the windiest day in Kastamonu?
The windiest day measured in Kastamonu between 1940 and 2025 was 9 October 2003, with winds reaching 40.8 km/h.
What is the warmest month in Kastamonu?
The warmest month in Kastamonu is August (19.1 °C on average); the coldest is January (-1.7 °C).
How much does it rain in Kastamonu?
Kastamonu receives on average 620 mm of precipitation per year, spread over about 125 rainy days.
Is it sunny in Kastamonu?
Kastamonu 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 Kastamonu?
The heaviest 24-hour snowfall measured in Kastamonu between 1940 and 2025 was 17 December 2003, with 26.3 cm.
Are there tropical nights in Kastamonu?
Almost never: tropical nights (temperature staying above 20 °C) are virtually non-existent in Kastamonu.
What was the most extreme apparent temperature in Kastamonu?
In Kastamonu, between 1940 and 2025, the highest apparent temperature reached 39.4 °C on 30 July 2000, and the lowest was -30.7 °C on 17 January 1944.
Compare Kastamonu with another city
Pick a second city: its normals will be set against these, indicator by indicator.
Nearby cities
The climate around Kastamonu