Istanbul
Turkey
| Season | Autumn | Winter | Spring | Summer | |||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Month | Sep | Oct | Nov | Dec | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Year |
| Record high, °C | 34 | 35 | 30 | 23 | 21 | 25 | 28 | 34 | 39 | 32 | 38 | 37 | 39 |
| Average high, °C | 30 | 27 | 21 | 16 | 14 | 15 | 18 | 22 | 25 | 28 | 30 | 31 | 23 |
| Average temperature, °C | 25 | 21 | 16 | 11 | 10 | 11 | 13 | 17 | 20 | 23 | 26 | 27 | 18 |
| Average low, °C | 20 | 15 | 10 | 7 | 5 | 6 | 8 | 12 | 15 | 19 | 22 | 23 | 14 |
| Record low, °C | 16 | 6 | 3 | 0 | 0 | 0 | 1 | 7 | 10 | 13 | 18 | 20 | 0 |
| Rain, days | 4 | 8 | 12 | 14 | 13 | 13 | 13 | 8 | 5 | 3 | 2 | 2 | 97 |
| Fog, days | 17 | 11 | 6 | 10 | 8 | 9 | 11 | 16 | 20 | 19 | 23 | 21 | 171 |
| Thunderstorms, days | 2 | 7 | 5 | 2 | 1 | 2 | 4 | 2 | 2 | 2 | 0 | 1 | 30 |
| Average precipitation, mm. | 53 | 96 | 91 | 124 | 109 | 106 | 115 | 99 | 73 | 37 | 19 | 24 | 946 |
| Relative humidity morning, % | 73 | 72 | 69 | 69 | 66 | 68 | 72 | 75 | 76 | 79 | 78 | 76 | 73 |
| Relative humidity evening, % | 61 | 58 | 56 | 57 | 56 | 57 | 60 | 62 | 67 | 69 | 69 | 67 | 62 |
| Wind speed, km/h | 8 | 3 | 6 | 6 | 6 | 6 | 4 | 9 | 8 | 9 | 12 | 9 | 7 |
| Day Length, часов | 13 | 12 | 11 | 10 | 10 | 11 | 12 | 14 | 15 | 15 | 15 | 14 | 13 |
| Dew point, °C | 20 | 15 | 9 | 6 | 3 | 5 | 7 | 12 | 16 | 19 | 22 | 22 | 156 |
| Growing degree-day, °C | 450 | 336 | 158 | 34 | 0 | 8 | 86 | 200 | 310 | 400 | 491 | 517 | 2990 |
| Solar radiation, global, Mj/m2 | 20 | 14 | 9 | 7 | 8 | 11 | 15 | 18 | 22 | 26 | 27 | 24 | 17 |