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Climate — Sillian: monthly averages
| Month | Day (max) | Night (min) | Monthly precipitation |
|---|---|---|---|
| January | 8°C | -24°C | 52 mm |
| February | 10°C | -25°C | 55 mm |
| March | 15°C | -23°C | 69 mm |
| April | 20°C | -15°C | 86 mm |
| May | 24°C | -6°C | 118 mm |
| June | 30°C | -3°C | 122 mm |
| July | 28°C | 2°C | 129 mm |
| August | 29°C | 0°C | 146 mm |
| September | 25°C | -6°C | 111 mm |
| October | 21°C | -14°C | 113 mm |
| November | 17°C | -18°C | 116 mm |
| December | 7°C | -26°C | 73 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)