Novo Mesto weather in December

In December, Novo Mesto sees average daytime highs of 5°C and overnight lows near -1°C, with 88 mm of precipitation across 10.2 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 6°C in the first days to 4°C by the end. The sky is clear or mostly clear about 22% 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 Novo Mesto's 11th-clearest and 6th-windiest month. For the whole year in context, see Novo Mesto's year-round climate.

Daytime high
11th warmest
Overnight low
-1°
3rd coldest
Precipitation
88 mm
10.2 wet days
Daylight
8 h 30 min
7:41 AM – 4:10 PM
Cloud cover
69%
11th clearest
Wind
6 km/h
6th windiest
Solar energy
1.06 kWh/m²
Travel score
0.0
out of 10

Novo Mesto is town in Lower Carniola, Slovenia.

Air quality
Good
PM10 21.4 µg/m³ · 2019
Density
734/km²
people per km²
Founded
1365

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 6°C in the first days to 4°C by the end.

A typical December day in Novo Mesto reaches about 5°C in the afternoon and slips back to -1°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 11°C. Set against its neighbours, December runs about 5°C cooler than November and on par with January.

-10°-5°10°15°151015202531
Avg high (°C)Avg low (°C)
161
260
360
460
550
650
750
85-1
95-1
105-1
115-1
125-1
135-1
144-1
154-1
164-2
174-2
184-2
194-2
204-2
214-2
224-2
234-2
244-2
254-2
264-2
274-2
284-2
294-2
304-2
314-2

How December really feels in Novo Mesto

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.

Novo Mesto 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 / -2°609.26.28.90.0
Feb / -2°728.85.610.10.5
Mar11° / 7410.53.811.62.8
Apr16° / 9012113.34.6
May20° / 10°11214.7014.75.7
Jun24° / 14°11513.4015.56.4
Jul26° / 15°10812.2015.26.5
Aug26° / 15°11211.6013.96.7
Sep21° / 11°12011.7012.36.2
Oct15° / 10610.10.610.74.7
Nov10° / 10611.32.99.31.9
Dec / -1°8810.25.28.50.0

Cloud cover in December

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 22% of the time in December.

Beyond those clear spells, partly cloudy skies cover about 11% of December, with mostly cloudy or overcast conditions the remaining 67%. Skies tend to open up as the month goes on.

0%25%50%75%100%151015202531
Clearer (%)Cloudier (%)
12872
22872
32971
42971
53070
63070
73169
83169
93268
103268
113169
123268
133367
143367
153367
163367
173367
183367
193367
203466
213466
223565
233565
243565
253565
263763
273763
283763
293763
303763
313763

Chance of precipitation in December

Any precipitationSnow

Novo Mesto gets around 88 mm of rain and snow over 10.2 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 34% and peaks near 36% on the wettest days, and about 5 days bring snow.

0%10%20%30%40%50%151015202531
Rain chance (%)Snow chance (%)
13616
23617
33617
43617
53617
63617
73617
83617
93518
103518
113418
123418
133318
143317
153317
163217
173217
183217
193217
203217
213217
223217
233217
243217
253217
263217
273217
283217
293218
303318
313318

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 7:27 AM to 7:47 AM, and sunset from 4:11 PM to 4:18 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202531
Daylight (h)Sunrise (AM)Sunset (PM)
18.77:274:11
28.77:284:11
38.77:294:11
48.77:304:10
58.67:314:10
68.67:324:10
78.67:334:10
88.67:344:10
98.67:354:10
108.67:364:10
118.57:374:10
128.57:384:10
138.57:394:10
148.57:394:10
158.57:404:10
168.57:414:10
178.57:414:10
188.57:424:11
198.57:434:11
208.57:434:12
218.57:444:12
228.57:444:12
238.57:454:13
248.57:454:13
258.57:454:14
268.57:464:15
278.57:464:15
288.57:464:16
298.57:474:17
308.57:474:17
318.57:474:18

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 5.92 kWh/m² in July 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 Novo Mesto?

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
10th-best month of the year

December is a weaker month for outdoor sightseeing in Novo Mesto.

What to pack for Novo Mesto in December

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

In December, Novo Mesto sees daytime highs around 5°C and nights near -1°C. Pack a warm layer. Worth having: a heavy coat and rain gear. About 10 days see rain.

a warm layera heavy coatrain gear

UV index in Novo Mesto 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 Novo Mesto 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 Novo Mesto 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 Novo Mesto is worst in January — around 19 µg/m³ PM2.5 (moderate), and holds fairly steady the rest of the year.

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

0102030JanFebMarAprMayJunJulAugSepOctNovDecModerateJan 1919 µg/m³Sep 1613 µg/m³
PM2.5 (µg/m³)Level
Jan19Moderate
Feb17Moderate
Mar19Moderate
Apr18Moderate
May15Moderate
Jun16Moderate
Jul14Moderate
Aug14Moderate
Sep13Moderate
Oct14Moderate
Nov14Moderate
Dec15Moderate
Location & terrain

Where is Novo Mesto?

Novo Mesto sits at 45.8°N, 15.2°E, 187 m above sea level, in Slovenia. The nearest listed city is Žumberak, 20 km away.

ŽumberakTrbovljeSamoborKarlovacCeljeZaprešićLjubljanaVelenje

Topography around Novo Mesto

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

Within 3 km, the terrain around Novo Mesto has only modest variations in elevation — a maximum elevation change of 124 m around an average of 202 m above sea level; within 16 km, large variations in elevation — a maximum elevation change of 1,034 m; within 80 km, extreme variations in elevation — a maximum elevation change of 2,492 m.

The land around Novo Mesto is covered by trees (47%) and grassland (22%) within 3 km, trees (70%) and grassland (22%) within 16 km, and trees (77%) within 80 km.

3 km
124 m
16 km
1,034 m
80 km
2,492 m
treesgrasslandcroplandartificial surfacesbare terrainwater
December weather nearby: Žumberak 20 km · Trbovlje 40 km · Samobor 43 km · Karlovac 46 km · Celje 48 km · Zaprešić 50 km · Ljubljana 58 km · Velenje 62 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 Novo Mesto (45.804°, 15.1689°, elevation 187 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).