Sønderborg weather in December

In December, Sønderborg sees average daytime highs of 5°C and overnight lows near 1°C, with 56 mm of precipitation across 11.6 wet days and about 7 hours of daylight. It is the 10th-warmest and 5th-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 11% of the time in December, and the air most often feels dry.

Daylight stretches from about 7 h 18 min at the start of December to 7 hours by month's end. Set against the rest of the year, December is Sønderborg's 12th-clearest and 3rd-windiest month. For the whole year in context, see Sønderborg's year-round climate.

Daytime high
10th warmest
Overnight low
3rd coldest
Precipitation
56 mm
11.6 wet days
Daylight
7 hours
8:48 AM – 3:46 PM
Cloud cover
79%
12th clearest
Wind
19 km/h
3rd windiest
Solar energy
0.4 kWh/m²
Travel score
0.1
out of 10

Sønderborg is town in Denmark.

Density
2,072/km²
people per km²
Founded
1256

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 Sønderborg reaches about 5°C in the afternoon and slips back to 1°C overnight — a 3°C spread between the day's warmth and the night's chill. On most days the high lands between 0°C and 9°C. Set against its neighbours, December runs about 3°C cooler than November and about 1°C warmer than January.

-10°-5°10°151015202531
Avg high (°C)Avg low (°C)
163
263
362
462
562
652
752
852
952
1052
1152
1252
1352
1452
1552
1651
1751
1851
1951
2041
2141
2241
2341
2441
2541
2641
2741
2841
2941
3041
3141

How December really feels in Sønderborg

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.

Sønderborg weather by month

How December compares with the rest of the year at a glance. December is the 10th-warmest and 5th-wettest month here — the current month is highlighted below.

MonthHigh / Low (°C)Rainfall (mm)Wet daysSnow daysDaylight (hours)Travel score
Jan / 5611.637.60.0
Feb / 439.53.29.30.0
Mar / 4610.11.811.40.7
Apr11° / 399.30.313.82.7
May15° / 5110.3015.84.7
Jun19° / 11°6111.40175.7
Jul21° / 14°6312.1016.56.1
Aug21° / 14°6711.8014.76.1
Sep17° / 11°5510.2012.55.2
Oct12° / 5811.9010.23.1
Nov / 5111.10.68.11.1
Dec / 5611.62.170.1

Cloud cover in December

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 11% 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 79%.

0%25%50%75%100%151015202531
Clearer (%)Cloudier (%)
12080
22080
32080
42080
52080
62080
72080
82179
92179
102179
112179
122179
132179
142278
152278
162278
172278
182278
192179
202179
212179
222179
232278
242278
252278
262278
272278
282278
292278
302278
312278

Chance of precipitation in December

Any precipitationSnow

Sønderborg gets around 56 mm of rain and snow over 11.6 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 37% and peaks near 40% on the wettest days, and about 2 days bring snow.

0%10%20%30%40%50%151015202531
Rain chance (%)Snow chance (%)
1365
2365
3375
4385
5395
6396
7396
8406
9396
10396
11396
12396
13386
14386
15376
16376
17376
18376
19367
20367
21367
22367
23367
24367
25368
26368
27378
28378
29378
30388
31388

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 19 km/h in December.

Across December, daily wind ranges from about 19 km/h on the calmest days to 20 km/h at its breeziest. It stays fairly steady from day to day.

0510152025151015202531
Wind speed (km/h)Feels
119light breeze
219light breeze
319light breeze
419light breeze
519light breeze
619light breeze
719light breeze
819light breeze
919light breeze
1019light breeze
1119light breeze
1219light breeze
1319light breeze
1419light breeze
1519light breeze
1619light breeze
1719light breeze
1819light breeze
1919light breeze
2019light breeze
2119light breeze
2219light breeze
2319light breeze
2419light breeze
2519light breeze
2619light breeze
2720light breeze
2820light breeze
2920light breeze
3020light breeze
3120light breeze

Sunrise & sunset in December

DaylightNight

Daylight runs from about 7 h 18 min at the start of December to 7 hours by month's end. The lit band spans sunrise to sunset each day.

Days shrink by about 18 minutes over December. Sunrise moves from 8:30 AM to 8:54 AM, and sunset from 3:51 PM to 3:54 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202531
Daylight (h)Sunrise (AM)Sunset (PM)
17.38:303:51
27.38:323:50
37.38:333:49
47.28:353:49
57.28:363:48
67.28:383:48
77.18:393:47
87.18:403:47
97.18:413:46
107.18:423:46
117.08:443:46
127.08:453:46
137.08:463:46
147.08:473:46
157.08:483:46
167.08:483:46
176.98:493:46
186.98:503:46
196.98:513:46
206.98:513:47
216.98:523:47
226.98:523:47
236.98:533:48
246.98:533:48
256.98:533:49
266.98:543:50
276.98:543:50
287.08:543:51
297.08:543:52
307.08:543:53
317.08:543:54

Solar energy in December

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in December, about 0.4 kWh/m² — the year's lowest.

For context, solar energy here swings from a low near 0.4 kWh/m² to a high of 5.62 kWh/m² in June across the year — December's 0.4 kWh/m² sits near the bottom.

00.511.52151015202531
Solar energy (kWh/m²)Level
10.5Dim
20.5Dim
30.5Dim
40.5Dim
50.4Dim
60.4Dim
70.4Dim
80.4Dim
90.4Dim
100.4Dim
110.4Dim
120.4Dim
130.4Dim
140.4Dim
150.4Dim
160.4Dim
170.4Dim
180.4Dim
190.4Dim
200.4Dim
210.4Dim
220.4Dim
230.4Dim
240.4Dim
250.4Dim
260.4Dim
270.4Dim
280.4Dim
290.4Dim
300.4Dim
310.4Dim
Planning a trip in December

Is December a good time to visit Sønderborg?

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

0.1
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 Sønderborg.

What to pack for Sønderborg in December

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

In December, Sønderborg sees daytime highs around 5°C and nights near 1°C. Pack a warm layer. Worth having: a heavy coat and rain gear. About 12 days see rain.

a warm layera heavy coatrain gear

Sea temperature near Sønderborg in December

The nearest coast averages about 4°C in December — the other half of the beach question. The full-year curve and swim-comfort zones are below.

The sea at the nearest coast (about 22 km away) is warmest in August at about 19°C and coldest in February near 2°C.

The water stays below 20°C all year — cool enough that most swimmers want a wetsuit.

0°10°20°JanFebMarAprMayJunJulAugSepOctNovDecbracingcoolrefreshing
Sea temperature (°C)Comfort
Jan3Bracing
Feb2Bracing
Mar3Bracing
Apr5Bracing
May11Bracing
Jun15Cool
Jul18Cool
Aug19Cool
Sep16Cool
Oct12Bracing
Nov9Bracing
Dec4Bracing

UV index in Sønderborg in December

LowModerateHighVery highExtreme

Clear-sky midday UV in December peaks around 0. The full-year curve, shaded by WHO exposure level, is below.

Under clear skies, the midday UV index in Sønderborg peaks around July 17 at about 5 (high) — a little sun protection helps at midday. It bottoms out near January 1 at about 0 (low).

The index reaches 3 or more — the level where the WHO recommends sun protection — in 6 months of the year.

025710JanFebMarAprMayJunJulAugSepOctNovDecLowModerateHighModerateLowJul 17UV 5Jan 1UV 0
UV index (midday)Level
Jan0Low
Feb1Low
Mar2Moderate
Apr3Moderate
May5High
Jun5High
Jul5High
Aug5High
Sep4Moderate
Oct2Low
Nov1Low
Dec0Low
Location & terrain

Where is Sønderborg?

Sønderborg sits at 54.9°N, 9.8°E, 15 m above sea level, in Denmark. The nearest listed city is Flensburg, 26 km away.

FlensburgAabenraaHaderslevSchleswigEckernfördeSvendborgTønderOdense

Topography around Sønderborg

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

Within 3 km, the terrain around Sønderborg has only modest variations in elevation — a maximum elevation change of 66 m around an average of 13 m above sea level; within 16 km, only modest variations in elevation — a maximum elevation change of 92 m; within 80 km, only modest variations in elevation — a maximum elevation change of 147 m.

The land around Sønderborg is covered by water (31%), grassland (23%) and artificial surfaces (22%) within 3 km, water (39%) and cropland (34%) within 16 km, and cropland (35%) and water (33%) within 80 km.

3 km
66 m
16 km
92 m
80 km
147 m
treesgrasslandcroplandartificial surfaceswater
December weather nearby: Flensburg 26 km · Aabenraa 28 km · Haderslev 42 km · Schleswig 46 km · Eckernförde 49 km · Svendborg 55 km · Tønder 59 km · Odense 66 km

Denmark travel facts

Travel advisory
Level 2
Exercise Increased Caution
Power plugs
Type C / E / F / K
230 V · 50 Hz
Prices
≈ 92% of US
price level, 2025
GDP per capita
$76,970
2025
Happiness
7.5 / 10
World Happiness, 2025
Safe drinking water
100%
of population, 2024
Homicide rate
0.8
per 100k, 2023
Road deaths
3.7
per 100k/yr, 2019
Income group
High
World Bank
English
Very high
EF EPI 611
Religion
Evangelical Lutheran 71%other/none/unspecified 24%Muslim 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 Sønderborg (54.909°, 9.7892°, elevation 15 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. Sea temperatures are the NOAA OISST v2.1 1991–2020 monthly climatology (public domain), sampled at the nearest ocean point. UV index is derived from CAMS (Copernicus Atmosphere Monitoring Service) clear-sky UV data — contains modified Copernicus Atmosphere Monitoring Service information. Topography is sampled from the Copernicus DEM GLO-90 elevation model (© ESA/Airbus) and ESA WorldCover 2021 land cover (CC BY 4.0).