Istanbul Weather Averages (1975-2010)
| ISTANBUL | January | February | March | April | May | June | July | August | September | October | November | December |
| Average Temperatures (1975-2010) | ||||||||||||
| Average Temperature(°C) | 6.1 | 6.1 | 7.9 | 12.3 | 16.9 | 21.6 | 23.9 | 23.8 | 20.1 | 15.7 | 11.4 | 8.1 |
| Average Highest Temperature(°C) | 9.0 | 9.5 | 11.8 | 16.9 | 21.7 | 26.4 | 28.7 | 28.7 | 25.1 | 20.0 | 15.1 | 10.9 |
| Average Lowest Temperature(°C) | 3.6 | 3.5 | 4.8 | 8.5 | 12.6 | 17.0 | 19.5 | 19.7 | 16.1 | 12.5 | 8.5 | 5.5 |
| Average Sun Light (hour) | 2.4 | 2.7 | 4.5 | 6.0 | 8.1 | 9.9 | 10.5 | 9.5 | 7.9 | 5.2 | 3.4 | 2.3 |
| Average Number of Rainy Days | 17.0 | 15.2 | 13.3 | 10.6 | 7.7 | 6.0 | 3.8 | 5.0 | 7.1 | 11.2 | 13.1 | 16.3 |
| Monthly Total Rain (kg/sqm) | 85.5 | 69.9 | 63.3 | 46.4 | 31.5 | 26.5 | 23.3 | 33.0 | 39.4 | 84.2 | 89.4 | 103.0 |
| Highest and Lowest Temperatures (1975-2010) | ||||||||||||
| Highest Temperature(°C) | 22.4 | 24.0 | 26.2 | 32.9 | 35.1 | 40.6 | 39.7 | 40.5 | 36.6 | 34.2 | 27.2 | 24.9 |
| Lowest Temperature(°C) | -7.9 | -8.0 | -6.9 | 0.6 | 3.6 | 9.0 | 12.0 | 12.2 | 7.3 | 2.2 | -1.6 | -3.4 |