Istanbul
Turkey
| Season | Autumn | Winter | Spring | Summer | |||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Month | Sep | Oct | Nov | Dec | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Year |
| Record high, °C | 37 | 32 | 27 | 17 | 13 | 18 | 26 | 31 | 35 | 37 | 41 | 40 | 41 |
| Average high, °C | 27 | 20 | 12 | 5 | 2 | 4 | 10 | 17 | 22 | 27 | 31 | 31 | 17 |
| Average temperature, °C | 17 | 11 | 5 | 0 | -2 | 0 | 4 | 10 | 14 | 18 | 21 | 21 | 10 |
| Average low, °C | 6 | 3 | 0 | -3 | -7 | -5 | 0 | 3 | 6 | 9 | 11 | 10 | 3 |
| Record low, °C | 0 | -3 | -10 | -18 | -20 | -25 | 0 | -3 | 0 | 6 | 10 | 7 | -25 |
| Fog, days | 1 | 1 | 7 | 15 | 16 | 12 | 5 | 2 | 1 | 1 | 0 | 0 | 61 |
| Thunderstorms, days | 1 | 2 | 0 | 0 | 0 | 0 | 1 | 2 | 6 | 4 | 1 | 1 | 18 |
| Average precipitation, mm. | 10 | 37 | 48 | 51 | 45 | 37 | 57 | 52 | 46 | 18 | 5 | 3 | 409 |
| Relative humidity morning, % | 54 | 69 | 82 | 82 | 80 | 78 | 78 | 76 | 73 | 60 | 48 | 46 | 69 |
| Relative humidity evening, % | 28 | 42 | 61 | 71 | 73 | 68 | 57 | 48 | 44 | 32 | 27 | 26 | 48 |
| Wind speed, km/h | 9 | 8 | 6 | 6 | 8 | 8 | 20 | 16 | 9 | 19 | 20 | 20 | 12 |
| Day Length, часов | 13 | 12 | 11 | 10 | 10 | 11 | 12 | 14 | 15 | 15 | 15 | 14 | 13 |
| Dew point, °C | 6 | 5 | 1 | -1 | -4 | -3 | 0 | 4 | 7 | 8 | 9 | 8 | 40 |
| Growing degree-day, °C | 183 | 43 | 0 | 0 | 0 | 0 | 0 | 0 | 112 | 233 | 327 | 319 | 1217 |
| Solar radiation, global, Mj/m2 | 20 | 13 | 9 | 7 | 8 | 11 | 15 | 18 | 23 | 26 | 27 | 24 | 17 |