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Łomża, Poland climate
Cfb Oceanic / temperate
Łomża has a seasonal cool-temperate climate (Oceanic / temperate, Köppen Cfb). The hottest month is July with an average daily high near 25°C, while the coldest is January averaging around −5°C at night. Around 568 mm of precipitation falls each year, peaking in June (76 mm) and easing off in February (28 mm). At latitude 53°N, day length swings from 7.3 hours in midwinter to 16.7 hours at midsummer.
Temperature & precipitation
Daily high–low temperature range with the monthly average, plus monthly precipitation · 1991–2020 normals · hover a month for the exact figuresHours of sunshine per day
Estimated sunny hours each month — daylight length × clear-sky fraction · 1991–2020 monthly cloud cover (NASA POWER)Łomża climate normals (1991–2020)
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg high (°C) | 1 | 2 | 7 | 15 | 20 | 23 | 25 | 25 | 19 | 13 | 6 | 2 |
| Avg temp (°C) | −2 | −1 | 3 | 9 | 13 | 17 | 19 | 19 | 14 | 8 | 3 | 0 |
| Avg low (°C) | −5 | −4 | −2 | 2 | 7 | 11 | 13 | 12 | 8 | 4 | 1 | −3 |
| Precipitation (mm) | 29 | 28 | 32 | 38 | 55 | 76 | 70 | 64 | 64 | 43 | 33 | 35 |
| Jan – Jun | Jan | Feb | Mar | Apr | May | Jun |
|---|---|---|---|---|---|---|
| Avg high (°C) | 1 | 2 | 7 | 15 | 20 | 23 |
| Avg temp (°C) | −2 | −1 | 3 | 9 | 13 | 17 |
| Avg low (°C) | −5 | −4 | −2 | 2 | 7 | 11 |
| Precipitation (mm) | 29 | 28 | 32 | 38 | 55 | 76 |
| Jul – Dec | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|
| Avg high (°C) | 25 | 25 | 19 | 13 | 6 | 2 |
| Avg temp (°C) | 19 | 19 | 14 | 8 | 3 | 0 |
| Avg low (°C) | 13 | 12 | 8 | 4 | 1 | −3 |
| Precipitation (mm) | 70 | 64 | 64 | 43 | 33 | 35 |
Sky & atmosphere
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Cloud cover (%) | 76 | 76 | 70 | 65 | 65 | 65 | 66 | 62 | 65 | 71 | 79 | 74 |
| Relative humidity (%) | 94 | 92 | 84 | 75 | 73 | 71 | 71 | 69 | 74 | 83 | 91 | 94 |
| Wind speed (km/h) | 12.4 | 12.3 | 11.8 | 10.0 | 9.4 | 8.9 | 8.5 | 8.1 | 9.3 | 10.3 | 10.9 | 11.5 |
| Jan – Jun | Jan | Feb | Mar | Apr | May | Jun |
|---|---|---|---|---|---|---|
| Cloud cover (%) | 76 | 76 | 70 | 65 | 65 | 65 |
| Relative humidity (%) | 94 | 92 | 84 | 75 | 73 | 71 |
| Wind speed (km/h) | 12.4 | 12.3 | 11.8 | 10.0 | 9.4 | 8.9 |
| Jul – Dec | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|
| Cloud cover (%) | 66 | 62 | 65 | 71 | 79 | 74 |
| Relative humidity (%) | 71 | 69 | 74 | 83 | 91 | 94 |
| Wind speed (km/h) | 8.5 | 8.1 | 9.3 | 10.3 | 10.9 | 11.5 |
Methodology & sources
Temperature & precipitation — 1991–2020 normals computed from 28 years of daily observations at Ostroleka, a weather station, about 35 km from the city centre. The underlying daily records come from NOAA's global station network.
Cloud, humidity, wind & sunshine — modelled estimates from NASA POWER, NASA's satellite-and-reanalysis climatology. This is the standard global source for atmospheric variables, which are not measured at most weather stations.