Ustroń weather in December

In December, Ustroń sees average daytime highs of 2°C and overnight lows near -3°C, with 62 mm of precipitation across 12.1 wet days and about 8 hours of daylight. It is the 11th-warmest and 11th-wettest month of the year here.

Highs ease over the month, from about 3°C in the first days to 1°C by the end. The sky is clear or mostly clear about 15% of the time in December, and the air most often feels dry.

Daylight stretches from about 8 h 12 min at the start of December to 8 hours by month's end. Set against the rest of the year, December is Ustroń's 12th-clearest and 1st-windiest month. For the whole year in context, see Ustroń's year-round climate.

Daytime high
11th warmest
Overnight low
-3°
3rd coldest
Precipitation
62 mm
12.1 wet days
Daylight
7 h 54 min
7:43 AM – 3:39 PM
Cloud cover
74%
12th clearest
Wind
13 km/h
1st windiest
Solar energy
0.76 kWh/m²
Travel score
0.0
out of 10

Ustroń is city and urban gmina of Poland.

Air quality
Good
PM10 17.7 µg/m³ · 2019
Density
265/km²
people per km²
Founded
1305

Air quality: WHO Ambient Air Quality Database. Density & description: Wikidata (CC0), GeoNames.

Temperature in December

Average highAverage lowShaded bands: 10–90% of days

Highs ease over the month, from about 3°C in the first days to 1°C by the end.

A typical December day in Ustroń reaches about 2°C in the afternoon and slips back to -3°C overnight — a 5°C spread between the day's warmth and the night's chill. On most days the high lands between -4°C and 7°C. Set against its neighbours, December runs about 5°C cooler than November and about 1°C warmer than January.

-15°-10°-5°10°151015202531
Avg high (°C)Avg low (°C)
14-1
23-1
33-1
43-1
53-1
63-1
73-2
83-2
93-2
102-2
112-2
122-2
132-2
142-2
152-3
162-3
172-3
182-3
192-3
201-3
211-3
221-3
231-3
241-3
251-3
261-4
271-4
281-4
291-4
301-4
311-4

How December really feels in Ustroń

Once humidity and wind are folded in, December averages 0 days that feel above 32°C and 31 that feel at or below 0°C — the comfort signal a plain temperature reading hides.

Days feeling ≥ 32°C
0
heat index over the day's high
Days feeling ≤ C
31
wind chill below the day's low

The story in December is cold — wind chill drags the overnight "feels like" below the raw low.

Ustroń weather by month

How December compares with the rest of the year at a glance. December is the 11th-warmest and 11th-wettest month here — the current month is highlighted below.

MonthHigh / Low (°C)Rainfall (mm)Wet daysSnow daysDaylight (hours)Travel score
Jan / -4°6312.79.88.40.0
Feb / -4°6112.29.39.80.0
Mar / -1°6913.16.211.50.9
Apr13° / 6811.72.413.43.6
May18° / 11015.80.115.15.0
Jun21° / 12°115150165.6
Jul23° / 13°13415.9015.76.0
Aug23° / 13°9812.5014.26.5
Sep18° / 9412.3012.45.4
Oct13° / 7211.4110.53.4
Nov / 6411.84.38.80.9
Dec / -3°6212.18.180.0

Cloud cover in December

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 15% of the time in December, the cloudiest month of the year.

Beyond those clear spells, partly cloudy skies cover about 10% of December, with mostly cloudy or overcast conditions the remaining 75%.

0%25%50%75%100%151015202531
Clearer (%)Cloudier (%)
12674
22674
32674
42773
52773
62674
72575
82575
92575
102575
112575
122377
132476
142476
152476
162377
172377
182476
192476
202476
212476
222575
232575
242575
252674
262674
272674
282674
292674
302674
312674

Chance of precipitation in December

Any precipitationSnow

Ustroń gets around 62 mm of rain and snow over 12.1 wet days in December. The line is the day-by-day chance of measurable precipitation.

Day to day, the chance of measurable precipitation averages around 39% and peaks near 44% on the wettest days, and about 8 days bring snow. The odds climb toward the end of the month.

0%10%20%30%40%50%151015202531
Rain chance (%)Snow chance (%)
13620
23620
33620
43620
53721
63721
73721
83722
93722
103723
113723
123724
133724
143825
153826
163926
173927
184027
194028
204129
214129
224130
234231
244231
254332
264332
274432
284433
294433
304433
314433

Humidity in December

DryComfortableHumidMuggyOppressiveMiserable

Most of December feels dry — the stacked bands show each day's mix of comfort levels, read off the dew point.

By dew point, December lands in the dry band about 100% of days. It rarely turns muggy — the humid and sticky bands barely register.

0%25%50%75%100%151015202531
Dry (%)
1100
2100
3100
4100
5100
6100
7100
8100
9100
10100
11100
12100
13100
14100
15100
16100
17100
18100
19100
20100
21100
22100
23100
24100
25100
26100
27100
28100
29100
30100
31100

Wind in December

Winds average 13 km/h in December, the windiest month of the year.

Across December, daily wind ranges from about 12 km/h on the calmest days to 13 km/h at its breeziest. It stays fairly steady from day to day.

05101520151015202531
Wind speed (km/h)Feels
112light breeze
212light breeze
312light breeze
412light breeze
513light breeze
613light breeze
713light breeze
813light breeze
913light breeze
1013light breeze
1113light breeze
1213light breeze
1313light breeze
1413light breeze
1513light breeze
1613light breeze
1713light breeze
1813light breeze
1913light breeze
2013light breeze
2113light breeze
2213light breeze
2313light breeze
2413light breeze
2513light breeze
2613light breeze
2713light breeze
2813light breeze
2913light breeze
3013light breeze
3113light breeze

Sunrise & sunset in December

DaylightNight

Daylight runs from about 8 h 12 min at the start of December to 8 hours by month's end. The lit band spans sunrise to sunset each day.

Days shrink by about 12 minutes over December. Sunrise moves from 7:28 AM to 7:49 AM, and sunset from 3:41 PM to 3:47 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202531
Daylight (h)Sunrise (AM)Sunset (PM)
18.27:283:41
28.27:293:41
38.27:303:40
48.17:323:40
58.17:333:39
68.17:343:39
78.17:353:39
88.07:363:39
98.07:373:38
108.07:383:38
118.07:393:38
128.07:403:38
138.07:413:38
147.97:423:38
157.97:423:39
167.97:433:39
177.97:443:39
187.97:453:39
197.97:453:39
207.97:463:40
217.97:463:40
227.97:473:41
237.97:473:41
247.97:483:42
257.97:483:42
267.97:483:43
277.97:493:44
287.97:493:44
297.97:493:45
307.97:493:46
318.07:493:47

Solar energy in December

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in December, about 0.76 kWh/m² — the year's lowest.

For context, solar energy here swings from a low near 0.76 kWh/m² to a high of 5.24 kWh/m² in June across the year — December's 0.76 kWh/m² sits near the bottom.

00.511.52151015202531
Solar energy (kWh/m²)Level
10.8Dim
20.8Dim
30.8Dim
40.8Dim
50.8Dim
60.8Dim
70.8Dim
80.8Dim
90.8Dim
100.8Dim
110.8Dim
120.8Dim
130.8Dim
140.8Dim
150.8Dim
160.8Dim
170.8Dim
180.8Dim
190.8Dim
200.7Dim
210.7Dim
220.7Dim
230.7Dim
240.8Dim
250.8Dim
260.8Dim
270.8Dim
280.8Dim
290.8Dim
300.8Dim
310.8Dim
Planning a trip in December

Is December a good time to visit Ustroń?

Our two travel scores rate December for general sightseeing and for beach or pool weather — 0 (poor) to 10 (ideal).

0.0
Sightseeing
10th-best month of the year
0.0
Beach & pool
8th-best month of the year

December is a weaker month for outdoor sightseeing in Ustroń.

What to pack for Ustroń in December

From December's temperature range, rain chance, sun and wind — what's worth putting in the bag.

In December, Ustroń sees daytime highs around 2°C and nights near -3°C. Pack a warm layer and a heavy coat. Worth having: rain gear. About 12 days see rain.

a warm layera heavy coatrain gear

UV index in Ustroń in December

LowModerateHighVery highExtreme

Clear-sky midday UV in December peaks around 1. The full-year curve, shaded by WHO exposure level, is below.

Under clear skies, the midday UV index in Ustroń peaks around June 23 at about 7 (very high) — sunscreen and a hat are worth it in the middle of the day. It bottoms out near December 20 at about 1 (low).

The index reaches 3 or more — the level where the WHO recommends sun protection — in 7 months of the year.

025710JanFebMarAprMayJunJulAugSepOctNovDecLowModerateHighVery highHighModerateLowJun 23UV 7Dec 20UV 1
UV index (midday)Level
Jan1Low
Feb2Low
Mar4Moderate
Apr5Moderate
May6High
Jun7Very high
Jul7Very high
Aug6High
Sep4Moderate
Oct2Moderate
Nov1Low
Dec1Low

Air quality in Ustroń in December

GoodModeratePoorUnhealthyVery unhealthy

Average fine-particle pollution (PM2.5) through the year — so you can see where December falls, not just the annual average.

Air quality in Ustroń is worst in June — around 17 µg/m³ PM2.5 (moderate), about 1.7× the cleanest month (December, 10 µg/m³).

Modeled monthly averages (CAMS reanalysis, 2015–2024).

01020JanFebMarAprMayJunJulAugSepOctNovDecModerateGoodJun 1717 µg/m³Dec 1310 µg/m³
PM2.5 (µg/m³)Level
Jan12Moderate
Feb13Moderate
Mar15Moderate
Apr16Moderate
May16Moderate
Jun17Moderate
Jul16Moderate
Aug16Moderate
Sep14Moderate
Oct11Good
Nov11Good
Dec10Good
Location & terrain

Where is Ustroń?

Ustroń sits at 49.7°N, 18.8°E, 355 m above sea level, in Poland. The nearest listed city is Třinec, 11 km away.

Topography around Ustroń

How much the land rises and falls, and what covers it, within 3, 16 and 80 km of Ustroń.

Within 3 km, the terrain around Ustroń has significant variations in elevation — a maximum elevation change of 523 m around an average of 429 m above sea level; within 16 km, large variations in elevation — a maximum elevation change of 959 m; within 80 km, very significant variations in elevation — a maximum elevation change of 1,545 m.

The land around Ustroń is covered by trees (60%) and grassland (21%) within 3 km, trees (62%) within 16 km, and trees (59%) and cropland (21%) within 80 km.

3 km
523 m
16 km
959 m
80 km
1,545 m
treesgrasslandcroplandartificial surfaceswater
December weather nearby: Třinec 11 km · Cieszyn 13 km · Český Těšín 13 km · Bielsko-Biala 21 km · Karviná 24 km · Czechowice-Dziedzice 26 km · Havířov 27 km · Żywiec 28 km

Poland travel facts

Travel advisory
Level 1
Exercise Normal Precautions
Power plugs
Type C / E
230 V · 50 Hz
Prices
≈ 52% of US
price level, 2025
GDP per capita
$28,420
2025
Happiness
6.8 / 10
World Happiness, 2025
Safe drinking water
89%
of population, 2024
Homicide rate
0.8
per 100k, 2023
Road deaths
9.4
per 100k/yr, 2019
Income group
High
World Bank
English
Very high
EF EPI 600
Religion
Roman Catholic 71%refused to answer 21%no religion 7%

Sources: World Bank, US State Department, World Happiness Report, WHO/UNICEF, EF EPI, CIA World Factbook.

Data sources

Temperature, precipitation, cloud, humidity, wind and solar figures are a 1991–2020 climatology for Ustroń (49.7215°, 18.802°, elevation 355 m), computed from hourly ERA5 reanalysis — contains modified Copernicus Climate Change Service information. Sun figures are astronomical calculations, not observations. City data © GeoNames, CC BY 4.0. Map outlines from Natural Earth (public domain); interactive map © Google. UV index is derived from CAMS (Copernicus Atmosphere Monitoring Service) clear-sky UV data — contains modified Copernicus Atmosphere Monitoring Service information. Monthly air-quality (PM2.5) seasonality is from the CAMS EAC4 reanalysis (Copernicus Atmosphere Monitoring Service), scaled to the WHO annual mean where available. Topography is sampled from the Copernicus DEM GLO-90 elevation model (© ESA/Airbus) and ESA WorldCover 2021 land cover (CC BY 4.0).