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Climate — İstanbul: monthly averages
| Month | Day (max) | Night (min) | Monthly precipitation |
|---|---|---|---|
| January | 18°C | -6°C | 79 mm |
| February | 18°C | -6°C | 67 mm |
| March | 23°C | -3°C | 53 mm |
| April | 25°C | 1°C | 42 mm |
| May | 30°C | 7°C | 35 mm |
| June | 38°C | 13°C | 36 mm |
| July | 38°C | 17°C | 20 mm |
| August | 37°C | 18°C | 22 mm |
| September | 35°C | 12°C | 54 mm |
| October | 31°C | 6°C | 70 mm |
| November | 23°C | 0°C | 63 mm |
| December | 20°C | -3°C | 82 mm |
Long-term model averages for an area of about 50 km — not a forecast; mountains are often cooler. Source: NASA POWER Project (CC BY 4.0) (2001–2025)