Trbovlje weather in December

In December, Trbovlje sees average daytime highs of 4°C and overnight lows near -2°C, with 70 mm of precipitation across 8.9 wet days and about 8.5 hours of daylight. It is the 11th-warmest and 9th-wettest month of the year here.

Highs ease over the month, from about 5°C in the first days to 3°C by the end. The sky is clear or mostly clear about 25% of the time in December, and the air most often feels dry.

Daylight stretches from about 8 h 42 min at the start of December to 8 h 30 min by month's end. Set against the rest of the year, December is Trbovlje's 11th-clearest and 8th-windiest month. For the whole year in context, see Trbovlje's year-round climate.

Daytime high
11th warmest
Overnight low
-2°
3rd coldest
Precipitation
70 mm
8.9 wet days
Daylight
8 h 24 min
7:43 AM – 4:09 PM
Cloud cover
67%
11th clearest
Wind
6 km/h
8th windiest
Solar energy
1.06 kWh/m²
Travel score
0.0
out of 10

Trbovlje is town in Slovenia.

Air quality
Good
PM10 22.2 µg/m³ · 2019
Density
262/km²
people per km²
Founded
1220

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 5°C in the first days to 3°C by the end.

A typical December day in Trbovlje reaches about 4°C in the afternoon and slips back to -2°C overnight — a 6°C spread between the day's warmth and the night's chill. On most days the high lands between -1°C and 9°C. Set against its neighbours, December runs about 5°C cooler than November and on par with January.

-10°-5°10°151015202531
Avg high (°C)Avg low (°C)
150
250
35-1
45-1
54-1
64-1
74-1
84-1
94-2
104-2
114-2
124-2
134-2
144-2
154-2
163-2
173-2
183-2
193-3
203-3
213-3
223-3
233-3
243-3
253-3
263-3
273-3
283-3
293-3
303-3
313-3

How December really feels in Trbovlje

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.

Trbovlje weather by month

How December compares with the rest of the year at a glance. December is the 11th-warmest and 9th-wettest month here — the current month is highlighted below.

MonthHigh / Low (°C)Rainfall (mm)Wet daysSnow daysDaylight (hours)Travel score
Jan / -3°437.44.68.80.0
Feb / -3°567.54.5100.3
Mar10° / 6510.23.511.62.3
Apr15° / 84120.913.34.1
May19° / 10°10213.9014.75.6
Jun23° / 13°11514.4015.56.1
Jul25° / 15°12014.2015.26.4
Aug24° / 15°11012.80146.5
Sep20° / 11°10911.8012.35.9
Oct14° / 969.30.410.74.3
Nov / 92102.39.21.4
Dec / -2°708.94.98.50.0

Cloud cover in December

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 25% of the time in December.

Beyond those clear spells, partly cloudy skies cover about 12% of December, with mostly cloudy or overcast conditions the remaining 64%. Skies tend to open up as the month goes on.

0%25%50%75%100%151015202531
Clearer (%)Cloudier (%)
13268
23367
33367
43466
53466
63466
73466
83565
93565
103664
113664
123763
133763
143763
153862
163862
173763
183763
193862
203862
213862
223862
233862
243862
253862
263862
273862
283862
293961
303961
313961

Chance of precipitation in December

Any precipitationSnow

Trbovlje gets around 70 mm of rain and snow over 8.9 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 28% and peaks near 31% on the wettest days, and about 5 days bring snow.

0%10%20%30%40%151015202531
Rain chance (%)Snow chance (%)
13014
23014
33115
43115
53115
63116
73116
83116
93016
103017
112917
122917
132817
142817
152717
162717
172716
182716
192716
202716
212716
222716
232716
242716
252716
262716
272716
282716
292716
302716
312715

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 6 km/h in December.

Across December, daily wind ranges from about 6 km/h on the calmest days to 6 km/h at its breeziest. It stays fairly steady from day to day.

0246810151015202531
Wind speed (km/h)Feels
16calm
26calm
36calm
46calm
56calm
66calm
76calm
86calm
96calm
106calm
116calm
126calm
136calm
146calm
156calm
166calm
176calm
186calm
196calm
206calm
216calm
226calm
236calm
246calm
256calm
266calm
276calm
286calm
296calm
306calm
316calm

Sunrise & sunset in December

DaylightNight

Daylight runs from about 8 h 42 min at the start of December to 8 h 30 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 7:29 AM to 7:49 AM, and sunset from 4:10 PM to 4:17 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202531
Daylight (h)Sunrise (AM)Sunset (PM)
18.77:294:10
28.77:304:10
38.67:314:10
48.67:324:09
58.67:334:09
68.67:344:09
78.67:354:09
88.57:364:09
98.57:374:09
108.57:384:09
118.57:394:09
128.57:404:09
138.57:404:09
148.57:414:09
158.57:424:09
168.47:434:09
178.47:434:10
188.47:444:10
198.47:454:10
208.47:454:11
218.47:464:11
228.47:464:11
238.47:474:12
248.47:474:12
258.47:474:13
268.47:484:14
278.47:484:14
288.47:484:15
298.57:484:16
308.57:494:16
318.57:494:17

Solar energy in December

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in December, about 1.06 kWh/m² — the year's lowest.

For context, solar energy here swings from a low near 1.06 kWh/m² to a high of 5.72 kWh/m² in June across the year — December's 1.06 kWh/m² sits near the bottom.

00.511.52151015202531
Solar energy (kWh/m²)Level
11.1Dim
21.1Dim
31.1Dim
41.1Dim
51.1Dim
61.1Dim
71.1Dim
81.1Dim
91.1Dim
101.1Dim
111.1Dim
121.1Dim
131.1Dim
141.1Dim
151.1Dim
161.1Dim
171.1Dim
181.1Dim
191.1Dim
201.1Dim
211.1Dim
221.1Dim
231.1Dim
241.1Dim
251.1Dim
261.1Dim
271.1Dim
281.1Dim
291.1Dim
301.1Dim
311.1Dim
Planning a trip in December

Is December a good time to visit Trbovlje?

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

0.0
Sightseeing
11th-best month of the year
0.0
Beach & pool
8th-best month of the year

December is a weaker month for outdoor sightseeing in Trbovlje.

What to pack for Trbovlje in December

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

In December, Trbovlje sees daytime highs around 4°C and nights near -2°C. Pack a warm layer. Worth having: a heavy coat and rain gear. About 9 days see rain.

a warm layera heavy coatrain gear

UV index in Trbovlje 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 Trbovlje peaks around July 15 at about 8 (very high) — sunscreen, a hat and midday shade are essential. 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 highHighModerateLowJul 15UV 8Jan 1UV 1
UV index (midday)Level
Jan1Low
Feb2Moderate
Mar4Moderate
Apr7High
May6High
Jun8Very high
Jul8Very high
Aug7Very high
Sep5High
Oct3Moderate
Nov2Low
Dec1Low

Air quality in Trbovlje 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 Trbovlje is worst in April — around 17 µg/m³ PM2.5 (moderate), and holds fairly steady the rest of the year.

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

01020JanFebMarAprMayJunJulAugSepOctNovDecModerateGoodModerateApr 917 µg/m³Sep 2012 µg/m³
PM2.5 (µg/m³)Level
Jan16Moderate
Feb15Moderate
Mar17Moderate
Apr17Moderate
May15Moderate
Jun15Moderate
Jul14Moderate
Aug13Moderate
Sep12Good
Oct12Good
Nov12Good
Dec14Moderate
Location & terrain

Where is Trbovlje?

Trbovlje sits at 46.2°N, 15.1°E, 409 m above sea level, in Slovenia. The nearest listed city is Celje, 18 km away.

CeljeVelenjeNovo MestoLjubljanaŽumberakKranjMariborSamobor

Topography around Trbovlje

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

Within 3 km, the terrain around Trbovlje has large variations in elevation — a maximum elevation change of 733 m around an average of 433 m above sea level; within 16 km, large variations in elevation — a maximum elevation change of 1,024 m; within 80 km, very significant variations in elevation — a maximum elevation change of 2,360 m.

The land around Trbovlje is covered by trees (74%) within 3 km, trees (74%) within 16 km, and trees (74%) within 80 km.

3 km
733 m
16 km
1,024 m
80 km
2,360 m
treesgrasslandcroplandartificial surfaces
December weather nearby: Celje 18 km · Velenje 23 km · Novo Mesto 40 km · Ljubljana 44 km · Žumberak 51 km · Kranj 54 km · Maribor 64 km · Samobor 65 km

Slovenia travel facts

Travel advisory
Level 1
Exercise Normal Precautions
Power plugs
Type C / F
230 V · 50 Hz
Prices
≈ 63% of US
price level, 2025
GDP per capita
$37,376
2025
Happiness
6.9 / 10
World Happiness, 2025
Safe drinking water
100%
of population, 2024
Homicide rate
0.6
per 100k, 2023
Road deaths
5.1
per 100k/yr, 2019
Income group
High
World Bank
Religion
Catholic 69%atheist 14%Orthodox 4%non-believer/agnostic 4%

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 Trbovlje (46.1541°, 15.0518°, elevation 409 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).