Istanbul
Turkey
| Season | Autumn | Winter | Spring | Summer | |||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Month | Sep | Oct | Nov | Dec | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Year |
| Record high, °C | 40 | 38 | 31 | 22 | 22 | 23 | 30 | 36 | 40 | 38 | 42 | 41 | 42 |
| Average high, °C | 34 | 28 | 22 | 16 | 14 | 15 | 19 | 23 | 28 | 33 | 35 | 36 | 25 |
| Average temperature, °C | 26 | 22 | 16 | 11 | 9 | 11 | 14 | 18 | 21 | 26 | 29 | 29 | 19 |
| Average low, °C | 19 | 15 | 11 | 6 | 5 | 6 | 8 | 12 | 15 | 19 | 22 | 22 | 13 |
| Record low, °C | 12 | 1 | -3 | -3 | -3 | -7 | -2 | 1 | 7 | 11 | 13 | 16 | -7 |
| Fog, days | 12 | 4 | 3 | 4 | 5 | 5 | 8 | 12 | 15 | 19 | 23 | 22 | 132 |
| Thunderstorms, days | 2 | 5 | 3 | 2 | 2 | 2 | 4 | 4 | 5 | 3 | 1 | 1 | 34 |
| Average precipitation, mm. | 27 | 58 | 68 | 125 | 108 | 89 | 100 | 98 | 87 | 58 | 21 | 18 | 857 |
| Relative humidity morning, % | 79 | 72 | 71 | 74 | 72 | 74 | 79 | 85 | 87 | 88 | 86 | 86 | 79 |
| Relative humidity evening, % | 40 | 38 | 45 | 54 | 52 | 52 | 50 | 50 | 48 | 47 | 48 | 47 | 48 |
| Wind speed, km/h | 8 | 9 | 9 | 14 | 14 | 14 | 12 | 9 | 6 | 12 | 12 | 12 | 11 |
| Day Length, часов | 13 | 12 | 11 | 10 | 10 | 11 | 12 | 14 | 15 | 15 | 15 | 14 | 13 |
| Dew point, °C | 16 | 11 | 6 | 3 | 1 | 2 | 6 | 10 | 13 | 17 | 20 | 20 | 125 |
| Growing degree-day, °C | 492 | 353 | 183 | 17 | 0 | 8 | 103 | 217 | 353 | 475 | 568 | 577 | 3346 |
| Solar radiation, global, Mj/m2 | 19 | 13 | 9 | 7 | 8 | 11 | 14 | 17 | 22 | 26 | 27 | 24 | 16 |