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Climate — Grójec: monthly averages
| Month | Day (max) | Night (min) | Monthly precipitation |
|---|---|---|---|
| January | 11°C | -31°C | 41 mm |
| February | 13°C | -25°C | 35 mm |
| March | 21°C | -17°C | 39 mm |
| April | 28°C | -5°C | 43 mm |
| May | 31°C | -3°C | 78 mm |
| June | 35°C | 4°C | 66 mm |
| July | 36°C | 8°C | 80 mm |
| August | 37°C | 7°C | 59 mm |
| September | 35°C | 0°C | 53 mm |
| October | 25°C | -10°C | 48 mm |
| November | 19°C | -17°C | 41 mm |
| December | 12°C | -20°C | 39 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)