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 | 35 | 27 | 23 | 22 | 25 | 27 | 31 | 40 | 40 | 39 | 38 | 40 |
| Average high, °C | 25 | 20 | 14 | 10 | 8 | 9 | 11 | 17 | 21 | 26 | 28 | 28 | 18 |
| Average temperature, °C | 20 | 16 | 11 | 8 | 6 | 6 | 8 | 13 | 17 | 22 | 23 | 23 | 14 |
| Average low, °C | 16 | 12 | 8 | 5 | 3 | 3 | 5 | 8 | 12 | 17 | 19 | 19 | 11 |
| Record low, °C | 8 | 0 | -1 | -3 | -10 | -8 | -5 | 2 | 5 | 8 | 11 | 6 | -10 |
| Rain, days | 8 | 13 | 16 | 17 | 16 | 13 | 14 | 13 | 11 | 8 | 6 | 7 | 142 |
| Snow, days | 0 | 0 | 0 | 2 | 5 | 6 | 2 | 0 | 0 | 0 | 0 | 0 | 15 |
| Fog, days | 21 | 22 | 21 | 20 | 21 | 19 | 24 | 23 | 24 | 22 | 24 | 23 | 264 |
| Thunderstorms, days | 1 | 1 | 0 | 0 | 0 | 0 | 0 | 1 | 3 | 4 | 2 | 2 | 14 |
| Average precipitation, mm. | 58 | 90 | 85 | 114 | 87 | 69 | 65 | 54 | 47 | 48 | 32 | 45 | 794 |
| Relative humidity morning, % | 84 | 86 | 85 | 84 | 83 | 83 | 84 | 84 | 86 | 83 | 82 | 83 | 84 |
| Relative humidity evening, % | 56 | 65 | 68 | 72 | 71 | 69 | 67 | 63 | 61 | 55 | 55 | 55 | 63 |
| Wind speed, km/h | 4 | 4 | 4 | 4 | 4 | 6 | 6 | 12 | 4 | 4 | 6 | 6 | 5 |
| Day Length, часов | 13 | 12 | 10 | 10 | 10 | 11 | 12 | 14 | 15 | 16 | 15 | 14 | 13 |
| Dew point, °C | 14 | 11 | 7 | 4 | 2 | 2 | 3 | 7 | 11 | 15 | 17 | 17 | 110 |
| Growing degree-day, °C | 317 | 198 | 42 | 0 | 0 | 0 | 0 | 92 | 224 | 358 | 431 | 431 | 2092 |
| Solar radiation, global, Mj/m2 | 18 | 11 | 6 | 5 | 6 | 8 | 13 | 17 | 23 | 26 | 27 | 23 | 15 |