Istanbul
Turkey
| Season | Autumn | Winter | Spring | Summer | |||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Month | Sep | Oct | Nov | Dec | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Year |
| Record high, °C | 32 | 25 | 19 | 13 | 10 | 15 | 16 | 21 | 26 | 31 | 35 | 33 | 35 |
| Average high, °C | 26 | 18 | 10 | 2 | 0 | 1 | 6 | 12 | 19 | 25 | 30 | 30 | 15 |
| Average temperature, °C | 19 | 13 | 5 | -1 | -4 | -3 | 1 | 8 | 14 | 19 | 24 | 24 | 10 |
| Average low, °C | 13 | 7 | 1 | -4 | -7 | -6 | -1 | 3 | 8 | 13 | 17 | 17 | 5 |
| Record low, °C | 2 | -5 | -13 | -16 | -22 | -22 | -21 | -8 | 0 | 3 | 7 | 7 | -22 |
| Rain, days | 2 | 4 | 4 | 2 | 1 | 3 | 6 | 7 | 7 | 3 | 2 | 1 | 42 |
| Snow, days | 0 | 0 | 1 | 3 | 6 | 7 | 3 | 0 | 0 | 0 | 0 | 0 | 20 |
| Fog, days | 1 | 1 | 3 | 7 | 10 | 8 | 4 | 1 | 1 | 0 | 0 | 1 | 37 |
| Thunderstorms, days | 1 | 1 | 1 | 3 | 5 | 4 | 3 | 1 | 1 | 1 | 1 | 1 | 23 |
| Average precipitation, mm. | 10 | 70 | 97 | 93 | 89 | 105 | 131 | 136 | 63 | 17 | 3 | 4 | 818 |
| Relative humidity, % | 31 | 47 | 63 | 73 | 72 | 69 | 65 | 60 | 46 | 31 | 26 | 27 | 51 |
| Relative humidity morning, % | 62 | 74 | 80 | 77 | 78 | 78 | 82 | 82 | 78 | 70 | 61 | 61 | 74 |
| Relative humidity evening, % | 51 | 56 | 65 | 68 | 70 | 71 | 68 | 65 | 61 | 54 | 54 | 53 | 61 |
| Wind speed, km/h | 7 | 6 | 5 | 5 | 6 | 7 | 7 | 8 | 8 | 8 | 8 | 7 | 7 |
| Day Length, часов | 13 | 12 | 11 | 10 | 10 | 11 | 12 | 14 | 15 | 15 | 15 | 14 | 13 |
| Dew point, °C | 8 | 8 | 5 | 2 | -0 | 1 | 4 | 8 | 9 | 8 | 9 | 9 | 70 |
| Growing degree-day, °C | 275 | 69 | 0 | 0 | 0 | 0 | 0 | 0 | 103 | 267 | 413 | 413 | 1541 |
| Solar radiation, global, Mj/m2 | 20 | 14 | 9 | 7 | 8 | 12 | 15 | 18 | 22 | 26 | 26 | 23 | 17 |