Climate averages 1991–2020
Kastamonu weather
by month.
See how the year changes. August has the highest average daily maximum; August has the lowest average monthly rainfall.
Pleasant-weather months by our simple rule: JulyAugustSeptember
Long-term climate patterns, not a forecast for a particular trip.
Across the year Kastamonu averages a daytime high of 15.7°C and a nighttime low of 5.7°C, with about 603 mm of rain on roughly 118 days. August is the warmest month (average high 27.3°C) and January the coolest (3.4°C). May is the wettest month with 72 mm; August is the driest with 24 mm.
Months with pleasant weather by a simple rule (average high between 18°C and 29°C, average low of at least 5°C and at most 8 rain days): July, August and September. This looks at temperature and rain only, not humidity, wind, sea temperature or crowds.
The annual picture
A year in Kastamonu
Monthly rainfall
Average total · mmAverages from hourly ERA5 reanalysis data. Actual weather varies from year to year. How these numbers are calculated
Every month, side by side
Kastamonu climate table
| Month | Average highHigh / low | Average low | Rainfall mm/month | Rain days ≥1 mm/day | Daylight hours/dayDaylight h/day |
|---|---|---|---|---|---|
| January | 3.4°C-3.7°C | -3.7°C | 51 | 11.0 | 9.610 h |
| February | 5.2°C-3.1°C | -3.1°C | 53 | 11.1 | 10.611 h |
| March | 9.3°C-0.3°C | -0.3°C | 65 | 12.3 | 11.912 h |
| April | 15.0°C4.1°C | 4.1°C | 64 | 13.0 | 13.313 h |
| May | 19.7°C8.8°C | 8.8°C | 72 | 13.5 | 14.514 h |
| June | 23.2°C12.5°C | 12.5°C | 58 | 11.7 | 15.115 h |
| July | 26.7°C14.8°C | 14.8°C | 30 | 6.0 | 14.815 h |
| August | 27.3°C15.2°C | 15.2°C | 24 | 5.7 | 13.814 h |
| September | 23.5°C11.9°C | 11.9°C | 33 | 7.0 | 12.513 h |
| October | 18.1°C8.0°C | 8.0°C | 51 | 8.4 | 11.111 h |
| November | 11.3°C2.1°C | 2.1°C | 44 | 8.0 | 9.910 h |
| December | 5.6°C-1.7°C | -1.7°C | 59 | 10.7 | 9.29 h |
Rainfall is the average of the 30 separate monthly totals. A rain day is a local calendar day with at least 1 mm of precipitation. Daylight is the calculated sunrise-to-sunset length, not measured sunshine.
Compare places
Nearby cities
- ÇankırıTurkey · 88 kmHigh 18.2°C · Low 6.7°C · 404 mm rain a year
- KarabükTurkey · 98 kmHigh 18.4°C · Low 8.0°C · 812 mm rain a year
- BartınTurkey · 123 kmHigh 17.7°C · Low 9.9°C · 787 mm rain a year
- ÇorumTurkey · 135 kmHigh 17.2°C · Low 6.9°C · 565 mm rain a year
- ZonguldakTurkey · 165 kmHigh 17.7°C · Low 10.9°C · 862 mm rain a year
- KırıkkaleTurkey · 172 kmHigh 19.3°C · Low 8.0°C · 365 mm rain a year
- BafraTurkey · 179 kmHigh 17.1°C · Low 11.2°C · 681 mm rain a year
- AnkaraTurkey · 180 kmHigh 18.4°C · Low 7.4°C · 418 mm rain a year
Read the numbers correctly
Climate, not a promise.
These patterns help compare months. They cannot tell you the weather on a specific day of your trip.
Sources, method and limitsWhat do the high and low temperatures mean?
We average the daily maximum and daily minimum for each calendar month over 1991–2020. They are not record extremes, a forecast range or temperatures at a fixed time of day.
How is a rain day counted?
A local calendar day (standard time, UTC+3, no daylight saving) with at least 1 mm of total precipitation counts as one rain day. We count these for each year and month, then average across 30 years. The average does not predict which days will be wet.
Where do the numbers come from?
ERA5-Land (temperature) and ERA5 (precipitation) reanalysis from the Copernicus Climate Change Service, read from the Open-Meteo open-data archive. Temperature comes from the 0.1° model cell at 41.40°, 33.80° (3 km from the city centre), adjusted up by 0.4°C for the difference between the city's elevation (786 m) and the cell's (855 m). Rain comes from the 0.25° cell at 41.50°, 33.75°. These are model estimates, not weather-station readings; coast, hills and city streets can differ.
Does this page show sunshine, humidity or sea temperature?
No. The data used here contain air temperature and precipitation only. Daylight hours are calculated from the city's latitude (sunrise to sunset), not measured sunshine.