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 | 29 | 26 | 21 | 16 | 14 | 15 | 17 | 21 | 24 | 27 | 30 | 30 | 23 |
| Average temperature, °C | 24 | 21 | 15 | 11 | 10 | 10 | 13 | 16 | 20 | 23 | 26 | 27 | 18 |
| Average low, °C | 19 | 15 | 10 | 7 | 5 | 6 | 8 | 12 | 15 | 19 | 23 | 23 | 14 |
| 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. | 7 | 51 | 77 | 141 | 115 | 88 | 62 | 36 | 26 | 8 | 16 | 7 | 634 |
| 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 | 11 | 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 | 417 | 319 | 158 | 34 | 0 | 8 | 69 | 183 | 293 | 383 | 508 | 508 | 2880 |
| Solar radiation, global, Mj/m2 | 19 | 14 | 9 | 7 | 8 | 11 | 15 | 17 | 21 | 25 | 27 | 24 | 16 |