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Climate — Giresun: monthly averages
| Month | Day (max) | Night (min) | Monthly precipitation |
|---|---|---|---|
| January | 7°C | -25°C | 85 mm |
| February | 11°C | -27°C | 54 mm |
| March | 18°C | -20°C | 70 mm |
| April | 22°C | -15°C | 59 mm |
| May | 26°C | -4°C | 64 mm |
| June | 28°C | -2°C | 56 mm |
| July | 33°C | 2°C | 42 mm |
| August | 34°C | 1°C | 37 mm |
| September | 31°C | -1°C | 74 mm |
| October | 24°C | -15°C | 101 mm |
| November | 17°C | -18°C | 97 mm |
| December | 16°C | -27°C | 77 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)