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 | 31 | 23 | 17 | 16 | 18 | 25 | 29 | 32 | 37 | 38 | 37 | 38 |
| Average high, °C | 25 | 18 | 12 | 6 | 3 | 6 | 10 | 16 | 21 | 25 | 29 | 29 | 17 |
| Average temperature, °C | 18 | 12 | 7 | 2 | 0 | 2 | 5 | 10 | 15 | 19 | 22 | 22 | 11 |
| Average low, °C | 11 | 6 | 2 | -1 | -3 | -1 | 1 | 5 | 9 | 12 | 15 | 15 | 6 |
| Record low, °C | 2 | -3 | 0 | -16 | -24 | -23 | -17 | -5 | -1 | 3 | 8 | 6 | -24 |
| Fog, days | 1 | 6 | 15 | 21 | 21 | 15 | 12 | 6 | 4 | 1 | 1 | 1 | 104 |
| Thunderstorms, days | 1 | 1 | 0 | 0 | 0 | 0 | 0 | 1 | 5 | 4 | 1 | 1 | 14 |
| Average precipitation, mm. | 18 | 54 | 84 | 157 | 136 | 99 | 74 | 57 | 43 | 26 | 7 | 10 | 765 |
| Relative humidity morning, % | 58 | 69 | 80 | 84 | 82 | 81 | 78 | 75 | 75 | 66 | 57 | 54 | 72 |
| Relative humidity evening, % | 33 | 42 | 58 | 71 | 73 | 65 | 53 | 46 | 44 | 36 | 31 | 30 | 49 |
| Wind speed, km/h | 17 | 16 | 17 | 19 | 19 | 20 | 19 | 17 | 16 | 17 | 19 | 19 | 18 |
| Day Length, часов | 13 | 12 | 11 | 10 | 10 | 11 | 12 | 14 | 15 | 15 | 15 | 14 | 13 |
| Dew point, °C | 5 | 3 | 0 | -2 | -4 | -3 | -1 | 2 | 6 | 7 | 8 | 7 | 28 |
| Growing degree-day, °C | 233 | 52 | 0 | 0 | 0 | 0 | 0 | 8 | 146 | 250 | 370 | 370 | 1430 |
| Solar radiation, global, Mj/m2 | 20 | 14 | 9 | 7 | 8 | 11 | 15 | 19 | 22 | 26 | 27 | 24 | 17 |