Istanbul
Turkey
| Season | Autumn | Winter | Spring | Summer | |||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Month | Sep | Oct | Nov | Dec | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Year |
| Record high, °C | 35 | 31 | 23 | 17 | 12 | 18 | 26 | 30 | 36 | 36 | 38 | 37 | 38 |
| Average high, °C | 25 | 18 | 11 | 4 | 2 | 5 | 11 | 16 | 21 | 25 | 29 | 29 | 16 |
| Average temperature, °C | 18 | 13 | 7 | 1 | 0 | 2 | 6 | 11 | 15 | 19 | 22 | 22 | 11 |
| Average low, °C | 12 | 7 | 2 | -1 | -3 | -1 | 1 | 5 | 9 | 13 | 16 | 16 | 6 |
| Record low, °C | 1 | -7 | -12 | -16 | -22 | -23 | -21 | -6 | -2 | 2 | 5 | 6 | -23 |
| Rain, days | 4 | 7 | 9 | 10 | 8 | 8 | 10 | 14 | 14 | 9 | 5 | 4 | 102 |
| Snow, days | 0 | 0 | 2 | 6 | 9 | 6 | 4 | 0 | 0 | 0 | 0 | 0 | 27 |
| Fog, days | 7 | 15 | 21 | 22 | 23 | 18 | 17 | 10 | 8 | 6 | 2 | 4 | 153 |
| Thunderstorms, days | 1 | 1 | 0 | 0 | 0 | 0 | 0 | 2 | 5 | 6 | 3 | 2 | 20 |
| Average precipitation, mm. | 15 | 31 | 32 | 43 | 40 | 34 | 32 | 45 | 57 | 32 | 10 | 5 | 376 |
| Relative humidity morning, % | 71 | 78 | 85 | 87 | 86 | 84 | 82 | 82 | 83 | 80 | 71 | 67 | 80 |
| Relative humidity evening, % | 36 | 45 | 57 | 73 | 76 | 66 | 54 | 48 | 45 | 39 | 35 | 33 | 51 |
| Wind speed, km/h | 14 | 12 | 12 | 12 | 9 | 12 | 14 | 16 | 14 | 14 | 14 | 12 | 13 |
| Day Length, часов | 13 | 12 | 11 | 10 | 10 | 11 | 12 | 14 | 15 | 16 | 15 | 14 | 13 |
| Dew point, °C | 6 | 4 | 0 | -1 | -3 | -2 | 0 | 3 | 7 | 9 | 10 | 10 | 43 |
| Growing degree-day, °C | 250 | 69 | 0 | 0 | 0 | 0 | 0 | 8 | 146 | 267 | 379 | 379 | 1498 |
| Solar radiation, global, Mj/m2 | 18 | 12 | 8 | 6 | 7 | 9 | 14 | 16 | 21 | 24 | 25 | 22 | 15 |