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Climate — Gölcük: monthly averages
| Month | Day (max) | Night (min) | Monthly precipitation |
|---|---|---|---|
| January | 17°C | -18°C | 63 mm |
| February | 23°C | -14°C | 50 mm |
| March | 26°C | -9°C | 48 mm |
| April | 29°C | -6°C | 46 mm |
| May | 35°C | 0°C | 44 mm |
| June | 38°C | 6°C | 47 mm |
| July | 41°C | 9°C | 18 mm |
| August | 39°C | 8°C | 18 mm |
| September | 39°C | 3°C | 35 mm |
| October | 33°C | -4°C | 52 mm |
| November | 26°C | -9°C | 45 mm |
| December | 21°C | -15°C | 69 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)