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Monthly averages for Kastamonu from the Turkish State Meteorological Service, measured over 1930–2025.
The warmest month is August, with an average high of 28.2 °C. The coldest is January, when the average low is -4.5 °C. May has the most rainy days (14.5 on average), and August the fewest (5.7).
Month by month
| Month | Avg high °C | Avg low °C | Rainy days | Sun (h/day) |
|---|---|---|---|---|
| January | 3.3 | -4.5 | 12.3 | 2.3 |
| February | 6.2 | -3.4 | 11.3 | 3.5 |
| March | 11 | -0.8 | 12.1 | 4.5 |
| April | 16.7 | 3.4 | 12.9 | 5.6 |
| May | 21.3 | 7.6 | 14.5 | 7 |
| June | 24.8 | 10.5 | 11.9 | 8.4 |
| July | 27.9 | 12.4 | 6.4 | 9.7 |
| August | 28.2 | 12.3 | 5.7 | 9.3 |
| September | 24 | 9 | 6.7 | 7.3 |
| October | 18.2 | 5.2 | 9 | 5.4 |
| November | 11.1 | 0.9 | 9.6 | 3.8 |
| December | 5 | -2.3 | 12.1 | 2.1 |
January
In January, Kastamonu averages a high of 3.3 °C and a low of -4.5 °C, with about 12.3 rainy days.
February
In February, Kastamonu averages a high of 6.2 °C and a low of -3.4 °C, with about 11.3 rainy days.
March
In March, Kastamonu averages a high of 11 °C and a low of -0.8 °C, with about 12.1 rainy days.
April
In April, Kastamonu averages a high of 16.7 °C and a low of 3.4 °C, with about 12.9 rainy days.
May
In May, Kastamonu averages a high of 21.3 °C and a low of 7.6 °C, with about 14.5 rainy days.
June
In June, Kastamonu averages a high of 24.8 °C and a low of 10.5 °C, with about 11.9 rainy days.
July
In July, Kastamonu averages a high of 27.9 °C and a low of 12.4 °C, with about 6.4 rainy days.
August
In August, Kastamonu averages a high of 28.2 °C and a low of 12.3 °C, with about 5.7 rainy days.
September
In September, Kastamonu averages a high of 24 °C and a low of 9 °C, with about 6.7 rainy days.
October
In October, Kastamonu averages a high of 18.2 °C and a low of 5.2 °C, with about 9 rainy days.
November
In November, Kastamonu averages a high of 11.1 °C and a low of 0.9 °C, with about 9.6 rainy days.
December
In December, Kastamonu averages a high of 5 °C and a low of -2.3 °C, with about 12.1 rainy days.
Sources
Meteoroloji Genel Müdürlüğü — Kastamonu (1930–2025) (opens in a new tab)