Ulm weather in December

In December, Ulm sees average daytime highs of 3°C and overnight lows near -1°C, with 69 mm of precipitation across 13 wet days and about 8.2 hours of daylight. It is the 11th-warmest and 6th-wettest month of the year here.

Day-to-day highs hold fairly steady near 3°C through the month. The sky is clear or mostly clear about 14% of the time in December, and the air most often feels dry.

Daylight stretches from about 8 h 24 min at the start of December to 8 h 12 min by month's end. Set against the rest of the year, December is Ulm's 11th-clearest and 2nd-windiest month. For the whole year in context, see Ulm's year-round climate.

Daytime high
11th warmest
Overnight low
-1°
3rd coldest
Precipitation
69 mm
13 wet days
Daylight
8 h 06 min
8:12 AM – 4:20 PM
Cloud cover
75%
11th clearest
Wind
12 km/h
2nd windiest
Solar energy
0.87 kWh/m²
Travel score
0.0
out of 10

Ulm is large city in Baden-Württemberg, Germany.

Air quality
Moderate
PM2.5 10.2 µg/m³ · 2019
Density
1,015/km²
people per km²
Founded
1181

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 3°C through the month.

A typical December day in Ulm reaches about 3°C in the afternoon and slips back to -1°C overnight — a 5°C spread between the day's warmth and the night's chill. On most days the high lands between -2°C and 9°C. Set against its neighbours, December runs about 3°C cooler than November and on par with January.

-10°-5°10°151015202531
Avg high (°C)Avg low (°C)
14-1
24-1
34-1
44-1
54-1
64-1
73-1
83-1
93-1
103-1
113-1
123-1
133-1
143-1
153-1
163-1
173-1
183-1
193-2
203-2
213-2
223-2
233-2
243-2
253-2
263-2
273-2
283-2
293-2
303-2
313-2

How December really feels in Ulm

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.

Ulm weather by month

How December compares with the rest of the year at a glance. December is the 11th-warmest and 6th-wettest month here — the current month is highlighted below.

MonthHigh / Low (°C)Rainfall (mm)Wet daysSnow daysDaylight (hours)Travel score
Jan / -3°6111.75.68.60.0
Feb / -2°5010.35.59.90.0
Mar / 6612.43.611.61.6
Apr13° / 6211.31.213.43.6
May18° / 9514.40155.0
Jun21° / 12°9614.6015.85.7
Jul23° / 13°9914.5015.56.2
Aug23° / 13°8813.4014.16.3
Sep18° / 6911.30.112.45.5
Oct13° / 6711.40.410.63.4
Nov / 6410.92.890.7
Dec / -1°691368.20.0

Cloud cover in December

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 14% 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 74%.

0%25%50%75%100%151015202531
Clearer (%)Cloudier (%)
12278
22278
32278
42476
52476
62476
72476
82575
92674
102674
112674
122674
132773
142773
152674
162674
172674
182674
192773
202674
212674
222674
232773
242773
252773
262872
272872
282773
292773
302773
312773

Chance of precipitation in December

Any precipitationSnow

Ulm gets around 69 mm of rain and snow over 13 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 42% and peaks near 44% on the wettest days, and about 6 days bring snow.

0%10%20%30%40%50%151015202531
Rain chance (%)Snow chance (%)
13815
23916
33916
44016
54017
64117
74118
84118
94218
104219
114219
124319
134320
144420
154420
164420
174420
184420
194320
204320
214320
224320
234320
244320
254320
264220
274219
284219
294219
304118
314118

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 12 km/h in December.

Across December, daily wind ranges from about 11 km/h on the calmest days to 12 km/h at its breeziest. It stays fairly steady from day to day.

051015151015202531
Wind speed (km/h)Feels
111calm
211calm
311calm
411calm
511calm
611calm
711calm
812calm
912calm
1012calm
1112calm
1212calm
1312light breeze
1412light breeze
1512light breeze
1612light breeze
1712light breeze
1812light breeze
1912light breeze
2012light breeze
2112light breeze
2212light breeze
2312light breeze
2412light breeze
2512light breeze
2612light breeze
2712light breeze
2812light breeze
2912light breeze
3012light breeze
3112light breeze

Sunrise & sunset in December

DaylightNight

Daylight runs from about 8 h 24 min at the start of December to 8 h 12 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 7:58 AM to 8:18 AM, and sunset from 4:22 PM to 4:28 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202531
Daylight (h)Sunrise (AM)Sunset (PM)
18.47:584:22
28.47:594:22
38.48:004:21
48.38:014:21
58.38:024:20
68.38:034:20
78.38:044:20
88.28:054:20
98.28:064:20
108.28:074:20
118.28:084:20
128.28:094:20
138.28:104:20
148.18:114:20
158.18:124:20
168.18:124:20
178.18:134:20
188.18:144:21
198.18:144:21
208.18:154:21
218.18:154:22
228.18:164:22
238.18:164:23
248.18:174:23
258.18:174:24
268.18:174:24
278.18:184:25
288.18:184:26
298.18:184:26
308.18:184:27
318.28:184:28

Solar energy in December

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in December, about 0.87 kWh/m² — the year's lowest.

For context, solar energy here swings from a low near 0.87 kWh/m² to a high of 5.58 kWh/m² in June across the year — December's 0.87 kWh/m² sits near the bottom.

00.511.52151015202531
Solar energy (kWh/m²)Level
11.0Dim
20.9Dim
30.9Dim
40.9Dim
50.9Dim
60.9Dim
70.9Dim
80.9Dim
90.9Dim
100.9Dim
110.9Dim
120.9Dim
130.9Dim
140.9Dim
150.9Dim
160.9Dim
170.8Dim
180.8Dim
190.8Dim
200.8Dim
210.8Dim
220.8Dim
230.8Dim
240.8Dim
250.8Dim
260.9Dim
270.9Dim
280.9Dim
290.9Dim
300.9Dim
310.9Dim
Planning a trip in December

Is December a good time to visit Ulm?

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 Ulm.

What to pack for Ulm in December

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

In December, Ulm sees daytime highs around 3°C and nights near -1°C. Pack a warm layer. Worth having: a heavy coat and rain gear. About 13 days see rain.

a warm layera heavy coatrain gear

UV index in Ulm 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 Ulm peaks around July 15 at about 8 (very high) — sunscreen and a hat are worth it in the middle of the day. It bottoms out near December 22 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 8Dec 22UV 1
UV index (midday)Level
Jan1Low
Feb2Low
Mar4Moderate
Apr4Moderate
May6High
Jun7Very high
Jul8Very high
Aug7High
Sep4Moderate
Oct3Moderate
Nov1Low
Dec1Low
Location & terrain

Where is Ulm?

Ulm sits at 48.4°N, 10.0°E, 480 m above sea level, in Germany. The nearest listed city is Neu-Ulm, 2.0 km away.

Topography around Ulm

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

Within 3 km, the terrain around Ulm has only modest variations in elevation — a maximum elevation change of 148 m around an average of 495 m above sea level; within 16 km, significant variations in elevation — a maximum elevation change of 298 m; within 80 km, large variations in elevation — a maximum elevation change of 942 m.

The land around Ulm is covered by artificial surfaces (46%) and trees (37%) within 3 km, cropland (42%) and trees (31%) within 16 km, and trees (40%), cropland (28%) and grassland (24%) within 80 km.

3 km
148 m
16 km
298 m
80 km
942 m
treesgrasslandcroplandartificial surfaceswater
December weather nearby: Neu-Ulm 2.0 km · Eselsberg 3.0 km · Klingenstein 7.0 km · Senden 9.0 km · Laupheim 21 km · Illertissen 21 km · Günzburg 22 km · Ehingen 23 km

Germany travel facts

Travel advisory
Level 2
Exercise Increased Caution
Power plugs
Type C / F
230 V · 50 Hz
Prices
≈ 80% of US
price level, 2025
GDP per capita
$60,496
2025
Happiness
6.9 / 10
World Happiness, 2025
Safe drinking water
100%
of population, 2024
Homicide rate
0.9
per 100k, 2023
Road deaths
3.8
per 100k/yr, 2019
Income group
High
World Bank
English
Very high
EF EPI 615
Religion
none 44%Roman Catholic 25%Protestant 23%other 5%

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 Ulm (48.3984°, 9.9916°, elevation 480 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. Topography is sampled from the Copernicus DEM GLO-90 elevation model (© ESA/Airbus) and ESA WorldCover 2021 land cover (CC BY 4.0).