Istanbul
Turkey
| Season | Autumn | Winter | Spring | Summer | |||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Month | Sep | Oct | Nov | Dec | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Year |
| Record high, °C | 33 | 30 | 24 | 17 | 17 | 18 | 25 | 27 | 32 | 34 | 37 | 37 | 37 |
| Average high, °C | 27 | 20 | 14 | 8 | 6 | 8 | 12 | 17 | 22 | 27 | 31 | 31 | 19 |
| Average temperature, °C | 20 | 14 | 9 | 4 | 3 | 4 | 7 | 11 | 16 | 20 | 24 | 23 | 13 |
| Average low, °C | 12 | 8 | 4 | 1 | 0 | 0 | 2 | 6 | 10 | 13 | 16 | 16 | 7 |
| Record low, °C | 1 | -2 | -8 | -11 | 0 | -20 | -17 | -3 | -1 | 5 | 5 | 7 | -20 |
| Fog, days | 0 | 2 | 8 | 12 | 10 | 6 | 6 | 2 | 1 | 1 | 0 | 0 | 48 |
| Thunderstorms, days | 3 | 2 | 1 | 1 | 0 | 1 | 1 | 2 | 5 | 6 | 4 | 3 | 29 |
| Average precipitation, mm. | 15 | 34 | 36 | 58 | 57 | 46 | 41 | 41 | 38 | 25 | 9 | 6 | 406 |
| Relative humidity morning, % | 76 | 81 | 83 | 84 | 82 | 81 | 80 | 79 | 82 | 79 | 70 | 71 | 79 |
| Relative humidity evening, % | 32 | 41 | 53 | 65 | 64 | 59 | 50 | 46 | 43 | 37 | 33 | 32 | 46 |
| Wind speed, km/h | 4 | 4 | 4 | 4 | 4 | 6 | 6 | 16 | 6 | 6 | 6 | 4 | 6 |
| Day Length, часов | 13 | 12 | 11 | 10 | 10 | 11 | 12 | 14 | 15 | 15 | 15 | 14 | 13 |
| Dew point, °C | 7 | 4 | 1 | -1 | -3 | -2 | 0 | 2 | 6 | 8 | 10 | 10 | 42 |
| Growing degree-day, °C | 275 | 121 | 0 | 0 | 0 | 0 | 0 | 33 | 181 | 292 | 405 | 405 | 1711 |
| Solar radiation, global, Mj/m2 | 19 | 13 | 9 | 7 | 8 | 10 | 15 | 18 | 22 | 26 | 26 | 23 | 16 |