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Air quality now: good station Łomża, ul. Sikorskiego (1.4 km), measured 22:00 · source: GIOŚ (Polish Chief Inspectorate of Environmental Protection), unverified data
Climate — Łomża: monthly averages
| Month | Day (max) | Night (min) | Monthly precipitation |
|---|---|---|---|
| January | 12°C | -35°C | 44 mm |
| February | 12°C | -28°C | 36 mm |
| March | 20°C | -18°C | 38 mm |
| April | 28°C | -5°C | 39 mm |
| May | 30°C | -4°C | 73 mm |
| June | 32°C | 3°C | 68 mm |
| July | 33°C | 8°C | 80 mm |
| August | 35°C | 6°C | 70 mm |
| September | 33°C | -1°C | 53 mm |
| October | 23°C | -6°C | 52 mm |
| November | 18°C | -12°C | 47 mm |
| December | 11°C | -22°C | 46 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)