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Białystok, Poland climate

Dfb Warm-summer humid continental

Białystok has a seasonal cool-temperate climate (Warm-summer humid continental, Köppen Dfb). The hottest month is July with an average daily high near 76°F, while the coldest is January averaging around 22°F at night. Around 25 inches of precipitation falls each year, peaking in July (3.5 inches) and easing off in March (1.2 inches). At latitude 53°N, day length swings from 7.3 hours in midwinter to 16.7 hours at midsummer.

☀️ Summers

Mild

Highs near 76°F in July.

About 2 days a year above 90 °F

❄️ Winters

Cold

Lows near 22°F in January.

About 98 freezing nights a year

🌧️ Rain

Moderate rainfall

About 25 in of rain a year.

Wettest in July

⛅ Sky & trend

Often cloudy

Cloudy skies much of the year.

+1.3 °F vs 50 years ago

Temperature & precipitation

Daily high–low temperature range with the monthly average, plus monthly precipitation · 1991–2020 normals · hover a month for the exact figures

Clear vs cloudy days

Share of days each month that are clear, partly cloudy or cloudy · 1991–2020 · hover a month for the day counts

Białystok climate normals (1991–2020)

	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec
Avg high (°F)	31	34	43	56	67	72	76	75	65	53	42	34
Avg temp (°F)	26	28	35	46	55	61	65	64	55	45	37	30
Avg low (°F)	22	22	27	35	43	50	54	52	45	37	32	25
Precipitation (in)	1.4	1.3	1.2	1.6	2.9	2.5	3.5	3.0	2.1	2.2	1.4	1.9

Jan – Jun	Jan	Feb	Mar	Apr	May	Jun
Avg high (°F)	31	34	43	56	67	72
Avg temp (°F)	26	28	35	46	55	61
Avg low (°F)	22	22	27	35	43	50
Precipitation (in)	1.4	1.3	1.2	1.6	2.9	2.5

Jul – Dec	Jul	Aug	Sep	Oct	Nov	Dec
Avg high (°F)	76	75	65	53	42	34
Avg temp (°F)	65	64	55	45	37	30
Avg low (°F)	54	52	45	37	32	25
Precipitation (in)	3.5	3.0	2.1	2.2	1.4	1.9

How often — frequency of weather events

	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec
Days with measurable rain (days)	13	12	11	9	10	10	12	9	10	10	11	13
Days with high ≥ 90°F (days)	—	—	—	—	—	0.1	0.9	0.7	0.0	—	—	—
Days with low ≤ 32°F (days)	18	17	17	9	2	0.0	—	—	1	6	10	17

Jan – Jun	Jan	Feb	Mar	Apr	May	Jun
Days with measurable rain (days)	13	12	11	9	10	10
Days with high ≥ 90°F (days)	—	—	—	—	—	0.1
Days with low ≤ 32°F (days)	18	17	17	9	2	0.0

Jul – Dec	Jul	Aug	Sep	Oct	Nov	Dec
Days with measurable rain (days)	12	9	10	10	11	13
Days with high ≥ 90°F (days)	0.9	0.7	0.0	—	—	—
Days with low ≤ 32°F (days)	—	—	1	6	10	17

Sky & atmosphere

	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec
Cloud cover (%)	77	77	71	64	64	64	66	62	64	71	79	75
Clear days (≤ 30% cloud)	3	2	4	5	5	4	4	5	5	4	2	3
Partly cloudy days (30–70%)	7	7	8	9	10	11	12	11	10	8	6	6
Cloudy days (≥ 70%)	21	19	19	16	16	15	16	14	15	19	22	21
Relative humidity (%)	96	94	86	79	76	74	71	68	75	84	93	96
Wind speed (mph)	7.0	6.9	6.6	5.6	5.2	5.1	5.0	4.8	5.3	5.9	6.2	6.5

Jan – Jun	Jan	Feb	Mar	Apr	May	Jun
Cloud cover (%)	77	77	71	64	64	64
Clear days (≤ 30% cloud)	3	2	4	5	5	4
Partly cloudy days (30–70%)	7	7	8	9	10	11
Cloudy days (≥ 70%)	21	19	19	16	16	15
Relative humidity (%)	96	94	86	79	76	74
Wind speed (mph)	7.0	6.9	6.6	5.6	5.2	5.1

Jul – Dec	Jul	Aug	Sep	Oct	Nov	Dec
Cloud cover (%)	66	62	64	71	79	75
Clear days (≤ 30% cloud)	4	5	5	4	2	3
Partly cloudy days (30–70%)	12	11	10	8	6	6
Cloudy days (≥ 70%)	16	14	15	19	22	21
Relative humidity (%)	71	68	75	84	93	96
Wind speed (mph)	5.0	4.8	5.3	5.9	6.2	6.5

Methodology & sources

Temperature & precipitation — 1991–2020 normals computed from 30 years of daily observations at Bialystok, a weather station, about 4 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.

How we build these numbers →