Łomża climate — normals and trends
Łomża (Poland) has a warm-summer humid continental climate (Dfb) under the Köppen-Geiger classification. Its mean annual temperature is 7.5 °C and it receives 655 mm of precipitation per year.
These figures are normals computed over 86 complete calendar years, from 1940 to 2025, using ERA5 reanalysis data from the Copernicus programme.
The warmest month is July (18.2 °C on average) and the coldest is January (-3.6 °C). Rainfall peaks in July.
Łomża averages 113 frost days, 3 hot days (≥ 30 °C) and 132 rainy days per year.
Łomża has warmed by +2.5 °C between 1940 and 2025, or +0.29 °C per decade. This trend is statistically significant.
The number of frost days there went from about 131 to 95 per year over the period.
The hottest day of the period reached 36.2 °C (on 8 August 2015) and the coldest -33.5 °C (on 12 January 1950).
Data from ERA5 reanalysis (Copernicus Climate Change Service), redistributed under a CC-BY 4.0 licence. Normals are recomputed whenever the archive is updated.
Climate normals · ERA5
ŁomżaPodlasie
- coords
- 53.18°, 22.06°
- period
- 1940–2025 · 86 yrs
Mean daily temperature
7.5°C
Average daily high
11.0°C
Average daily low
3.8°C
Annual rainfall
655mm
Sunshine / day
7.0h
Mean relative humidity
79%
Average peak wind
18.2km/h
Seasonal range
21.8°C
Frost days (< 0 °C)
113 d/yr
Hot days (≥ 30 °C)
3 d/yr
Rainy days (≥ 1 mm)
132 d/yr
Annual snowfall
71.7 cm
Average feels-like high
8.2 °C
Average feels-like low
0.6 °C
Average peak gust
35.6 km/h
Tropical nights (≥ 20 °C)
0 d/yr
Solar radiation
10.3 MJ/m²
Has the climate changed?
One stripe per year, 1940 to 2025
+2.5 °C
since 1940
+0.3 °C per decade · r² = 0.42 · p = < 0.001
Trend fitted by linear regression (ordinary least squares) on annual means. A trend is shown only when it is statistically significant (p < 0.05).
A climograph overlays rainfall (bars) and temperature (line): the standard reading in climatology, where you can see at a glance whether the warm season is also the dry one.
Records for the period
Hottest day
36.2 °C
8 August 2015
Coldest day
-33.5 °C
12 January 1950
Wettest day
71 mm
3 September 1995
Windiest day
51.6 km/h
17 January 1955
Strongest gust
107.6 km/h
7 March 1983
Hottest feels-like
36.3 °C
31 July 1994
Coldest feels-like
-39.1 °C
12 January 1950
Snowiest day
21.1 cm
30 January 1979
Sunniest day
16.3 h
24 June 2022
Normals computed over complete calendar years 1940–2025.
A specific year
Pick a year and see how it compares to normal — warmer, drier or more extreme than usual?
Across the whole year
Month by month
| High | vs. normal | Precipitation | vs. normal | |
|---|---|---|---|---|
| Jan | 3.8 °C | +5.3 °C | 46 mm | +5 mm |
| Feb | 1.4 °C | +1.6 °C | 16 mm | -23 mm |
| Mar | 10.8 °C | +6.2 °C | 41 mm | +3 mm |
| Apr | 16.0 °C | +4.3 °C | 23 mm | -25 mm |
| May | 15.5 °C | -2.0 °C | 71 mm | +7 mm |
| Jun | 22.1 °C | +1.1 °C | 57 mm | -20 mm |
| Jul | 23.7 °C | +1.1 °C | 129 mm | +44 mm |
| Aug | 22.9 °C | +0.6 °C | 42 mm | -28 mm |
| Sep | 19.9 °C | +2.4 °C | 89 mm | +33 mm |
| Oct | 11.2 °C | 0.0 °C | 59 mm | +12 mm |
| Nov | 5.5 °C | +0.8 °C | 48 mm | +2 mm |
| Dec | 3.8 °C | +3.0 °C | 20 mm | -27 mm |
The year's extremes
What was the weather like that day?
Your birthday, a wedding, a memorable trip: discover the actual weather for any date since 1940.
Frequently asked questions
What is the climate of Łomża?
Łomża has a warm-summer humid continental climate (Köppen Dfb). Over 1940-2025, the average annual temperature is 7.5 °C and it receives 655 mm of precipitation per year.
What is the hottest day ever recorded in Łomża?
The hottest day measured in Łomża between 1940 and 2025 was 8 August 2015, reaching 36.2 °C.
What is the coldest day in Łomża?
The coldest day measured in Łomża between 1940 and 2025 was 12 January 1950, at -33.5 °C.
Does it snow in Łomża?
Yes. Łomża gets on average 71.7 cm of snow per year and has around 113 frost days.
Has the climate of Łomża warmed?
Yes: Łomża warmed by +2.5 °C between 1940 and 2025, a statistically significant trend.
What is the wettest day in Łomża?
The wettest day measured in Łomża between 1940 and 2025 was 3 September 1995, with 71 mm of rain in 24 hours.
What was the windiest day in Łomża?
The windiest day measured in Łomża between 1940 and 2025 was 17 January 1955, with winds reaching 51.6 km/h.
What is the warmest month in Łomża?
The warmest month in Łomża is July (18.2 °C on average); the coldest is January (-3.6 °C).
How much does it rain in Łomża?
Łomża receives on average 655 mm of precipitation per year, spread over about 132 rainy days.
Is it sunny in Łomża?
Łomża gets on average 7.0 hours of sunshine per day, roughly 2,555 hours per year over 1940-2025.
What is the biggest single-day snowfall in Łomża?
The heaviest 24-hour snowfall measured in Łomża between 1940 and 2025 was 30 January 1979, with 21.1 cm.
Are there tropical nights in Łomża?
Almost never: tropical nights (temperature staying above 20 °C) are virtually non-existent in Łomża.
What was the most extreme apparent temperature in Łomża?
In Łomża, between 1940 and 2025, the highest apparent temperature reached 36.3 °C on 31 July 1994, and the lowest was -39.1 °C on 12 January 1950.
Compare Łomża with another city
Pick a second city: its normals will be set against these, indicator by indicator.
Nearby cities
The climate around Łomża