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 | 32 | 26 | 22 | 21 | 23 | 26 | 32 | 35 | 37 | 41 | 37 | 41 |
| Average high, °C | 28 | 22 | 17 | 13 | 11 | 12 | 14 | 19 | 25 | 29 | 31 | 31 | 21 |
| Average temperature, °C | 22 | 17 | 12 | 9 | 7 | 8 | 10 | 14 | 19 | 23 | 26 | 25 | 16 |
| Average low, °C | 16 | 12 | 8 | 5 | 3 | 4 | 5 | 8 | 12 | 16 | 20 | 20 | 11 |
| Record low, °C | 5 | 2 | -3 | -5 | -7 | -6 | -5 | 1 | 3 | 8 | 12 | 11 | -7 |
| Rain, days | 2 | 5 | 10 | 11 | 11 | 9 | 8 | 8 | 6 | 2 | 2 | 1 | 75 |
| Snow, days | 0 | 0 | 0 | 0 | 0 | 1 | 0 | 0 | 0 | 0 | 0 | 0 | 1 |
| Fog, days | 3 | 4 | 3 | 3 | 3 | 3 | 4 | 4 | 4 | 4 | 5 | 5 | 45 |
| Thunderstorms, days | 1 | 1 | 2 | 2 | 2 | 2 | 2 | 2 | 2 | 1 | 1 | 0 | 18 |
| Average precipitation, mm. | 12 | 42 | 107 | 143 | 107 | 88 | 73 | 53 | 38 | 17 | 5 | 8 | 693 |
| Relative humidity, % | 60 | 67 | 71 | 73 | 72 | 70 | 68 | 64 | 63 | 58 | 56 | 58 | 65 |
| Relative humidity morning, % | 0 | 0 | 0 | 0 | 79 | 80 | 0 | 0 | 0 | 0 | 0 | 0 | 13 |
| Relative humidity evening, % | 0 | 0 | 0 | 0 | 63 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 5 |
| Wind speed, km/h | 0 | 0 | 0 | 0 | 8 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 1 |
| Day Length, часов | 13 | 12 | 11 | 10 | 10 | 11 | 12 | 14 | 15 | 16 | 15 | 14 | 13 |
| Dew point, °C | 0 | 0 | 0 | 0 | 1 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 1 |
| Growing degree-day, °C | 350 | 207 | 67 | 0 | 0 | 0 | 0 | 100 | 258 | 367 | 474 | 474 | 2296 |
| Solar radiation, global, Mj/m2 | 18 | 11 | 7 | 5 | 6 | 9 | 13 | 17 | 22 | 25 | 25 | 23 | 15 |