Ostrov weather in December

In December, Ostrov sees average daytime highs of 1°C and overnight lows near -3°C, with 52 mm of precipitation across 10.6 wet days and about 7.9 hours of daylight. It is the 11th-warmest and 8th-wettest month of the year here.

Day-to-day highs hold fairly steady near 1°C through the month. The sky is clear or mostly clear about 10% of the time in December, and the air most often feels dry.

Daylight stretches from about 8 h 06 min at the start of December to 7 h 54 min by month's end. Set against the rest of the year, December is Ostrov's 11th-clearest and 2nd-windiest month. For the whole year in context, see Ostrov's year-round climate.

Daytime high
11th warmest
Overnight low
-3°
3rd coldest
Precipitation
52 mm
10.6 wet days
Daylight
7 h 48 min
8:10 AM – 3:59 PM
Cloud cover
81%
11th clearest
Wind
13 km/h
2nd windiest
Solar energy
0.73 kWh/m²
Travel score
0.0
out of 10

Ostrov is town in the Czech Republic.

Density
311/km²
people per km²
Founded
1331

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

Temperature in December

Average highAverage lowShaded bands: 10–90% of days

Day-to-day highs hold fairly steady near 1°C through the month.

A typical December day in Ostrov reaches about 1°C in the afternoon and slips back to -3°C overnight — a 4°C spread between the day's warmth and the night's chill. On most days the high lands between -4°C and 6°C. Set against its neighbours, December runs about 4°C cooler than November and about 1°C warmer than January.

-15°-10°-5°10°151015202531
Avg high (°C)Avg low (°C)
12-2
22-2
32-2
42-2
52-2
62-2
72-2
82-2
91-2
101-2
111-3
121-3
131-3
141-3
151-3
161-3
171-3
181-3
191-3
201-3
211-3
221-3
231-3
241-4
251-4
261-4
270-4
280-4
290-4
300-4
310-4

How December really feels in Ostrov

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.

Ostrov weather by month

How December compares with the rest of the year at a glance. December is the 11th-warmest and 8th-wettest month here — the current month is highlighted below.

MonthHigh / Low (°C)Rainfall (mm)Wet daysSnow daysDaylight (hours)Travel score
Jan / -4°5011.58.78.30.0
Feb / -4°398.96.79.70.0
Mar / -1°5211.96.111.50.5
Apr11° / 4711.41.813.52.8
May16° / 70140.115.24.6
Jun19° / 10°8213.9016.15.5
Jul22° / 12°9014015.75.9
Aug21° / 12°7812.8014.36.1
Sep17° / 6010.4012.45.0
Oct11° / 5210.50.810.52.5
Nov / 499.548.80.3
Dec / -3°5210.68.17.90.0

Cloud cover in December

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 10% of the time in December.

Beyond those clear spells, partly cloudy skies cover about 7% of December, with mostly cloudy or overcast conditions the remaining 84%.

0%25%50%75%100%151015202531
Clearer (%)Cloudier (%)
11486
21486
31486
41486
51486
61486
71585
81486
91486
101486
111585
121585
131585
141585
151585
161585
171585
181684
191684
201684
211783
221783
231981
241981
251882
261981
271981
282080
292080
302179
312179

Chance of precipitation in December

Any precipitationSnow

Ostrov gets around 52 mm of rain and snow over 10.6 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 35% and peaks near 38% on the wettest days, and about 8 days bring snow.

0%10%20%30%40%50%151015202531
Rain chance (%)Snow chance (%)
12919
23019
33120
43121
53222
63222
73323
83424
93425
103525
113526
123627
133728
143728
153829
163829
173829
183829
193829
203729
213729
223629
233628
243628
253628
263627
273627
283626
293626
303726
313726

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.

Across December, daily wind ranges from about 11 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
111calm
212calm
312calm
412calm
512light breeze
612light breeze
712light breeze
812light 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 06 min at the start of December to 7 h 54 min by month's end. The lit band spans sunrise to sunset each day.

Days shrink by about 12 minutes over December. Sunrise moves from 7:54 AM to 8:15 AM, and sunset from 4:02 PM to 4:07 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202531
Daylight (h)Sunrise (AM)Sunset (PM)
18.17:544:02
28.17:554:01
38.17:574:01
48.07:584:01
58.07:594:00
68.08:004:00
78.08:014:00
88.08:023:59
97.98:033:59
107.98:043:59
117.98:053:59
127.98:063:59
137.98:073:59
147.98:083:59
157.88:093:59
167.88:103:59
177.88:103:59
187.88:114:00
197.88:124:00
207.88:124:00
217.88:134:01
227.88:134:01
237.88:144:02
247.88:144:02
257.88:144:03
267.88:154:04
277.88:154:04
287.88:154:05
297.88:154:06
307.98:154:06
317.98:154:07

Solar energy in December

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in December, about 0.73 kWh/m² — the year's lowest.

For context, solar energy here swings from a low near 0.73 kWh/m² to a high of 5.4 kWh/m² in June across the year — December's 0.73 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
100.7Dim
110.7Dim
120.7Dim
130.7Dim
140.7Dim
150.7Dim
160.7Dim
170.7Dim
180.7Dim
190.7Dim
200.7Dim
210.7Dim
220.7Dim
230.7Dim
240.7Dim
250.7Dim
260.7Dim
270.7Dim
280.7Dim
290.7Dim
300.7Dim
310.8Dim
Planning a trip in December

Is December a good time to visit Ostrov?

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 Ostrov.

What to pack for Ostrov in December

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

In December, Ostrov sees daytime highs around 1°C and nights near -3°C. Pack a warm layer and a heavy coat. Worth having: rain gear. About 11 days see rain.

a warm layera heavy coatrain gear

UV index in Ostrov 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 Ostrov peaks around June 22 at about 7 (very high) — sunscreen and a hat are worth it in the middle of the day. It bottoms out near January 1 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 22UV 7Jan 1UV 1
UV index (midday)Level
Jan1Low
Feb2Low
Mar4Moderate
Apr4Moderate
May6High
Jun7Very high
Jul7Very high
Aug7High
Sep4Moderate
Oct3Moderate
Nov1Low
Dec1Low

Air quality in Ostrov 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 Ostrov is worst in April — around 18 µg/m³ PM2.5 (moderate), about 1.7× the cleanest month (December, 11 µg/m³).

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

0102030JanFebMarAprMayJunJulAugSepOctNovDecModerateGoodApr 1518 µg/m³Dec 1311 µg/m³
PM2.5 (µg/m³)Level
Jan13Moderate
Feb14Moderate
Mar17Moderate
Apr18Moderate
May16Moderate
Jun18Moderate
Jul16Moderate
Aug16Moderate
Sep16Moderate
Oct13Moderate
Nov12Good
Dec11Good
Location & terrain

Where is Ostrov?

Ostrov sits at 50.3°N, 12.9°E, 398 m above sea level, in Czechia. The nearest listed city is Karlovy Vary, 9.0 km away.

SchwarzenbergAnnaberg-BuchholzAueChomutovSchneeberg

Topography around Ostrov

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

Within 3 km, the terrain around Ostrov has only modest variations in elevation — a maximum elevation change of 239 m around an average of 441 m above sea level; within 16 km, large variations in elevation — a maximum elevation change of 947 m; within 80 km, very significant variations in elevation — a maximum elevation change of 1,205 m.

The land around Ostrov is covered by trees (41%), grassland (26%) and cropland (22%) within 3 km, trees (71%) and grassland (22%) within 16 km, and trees (48%) and cropland (30%) within 80 km.

3 km
239 m
16 km
947 m
80 km
1,205 m
treesgrasslandcroplandartificial surfaceswater
December weather nearby: Karlovy Vary 9.0 km · Kadaň 25 km · Sokolov 25 km · Schwarzenberg 28 km · Annaberg-Buchholz 31 km · Aue 36 km · Chomutov 38 km · Schneeberg 38 km

Czechia travel facts

Travel advisory
Level 1
Exercise Normal Precautions
Power plugs
Type C / E
230 V · 50 Hz
Prices
≈ 59% of US
price level, 2025
GDP per capita
$35,917
2025
Happiness
6.8 / 10
World Happiness, 2025
Safe drinking water
98%
of population, 2024
Homicide rate
0.8
per 100k, 2023
Road deaths
5.9
per 100k/yr, 2019
Income group
High
World Bank
English
High
EF EPI 582
Religion
none 48%believers unaffiliated with a religious society 9%Roman Catholic 7%other believers belonging to a church or religious society 6%

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 Ostrov (50.3059°, 12.9391°, elevation 398 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).