Grenchen weather in December

In December, Grenchen sees average daytime highs of 4°C and overnight lows near -1°C, with 100 mm of precipitation across 14.2 wet days and about 8.4 hours of daylight. It is the 11th-warmest and 8th-wettest month of the year here.

Day-to-day highs hold fairly steady near 4°C through the month. The sky is clear or mostly clear about 17% of the time in December, and the air most often feels dry.

Daylight stretches from about 8 h 36 min at the start of December to 8 h 18 min by month's end. Set against the rest of the year, December is Grenchen's 11th-clearest and 4th-windiest month. For the whole year in context, see Grenchen's year-round climate.

Daytime high
11th warmest
Overnight low
-1°
3rd coldest
Precipitation
100 mm
14.2 wet days
Daylight
8 h 18 min
8:17 AM – 4:36 PM
Cloud cover
72%
11th clearest
Wind
7 km/h
4th windiest
Solar energy
1.03 kWh/m²
Travel score
0.0
out of 10

Grenchen is settlement within the municipality of the same name in Switzerland.

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 4°C through the month.

A typical December day in Grenchen reaches about 4°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 -1°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)
150
250
350
450
550
650
750
85-1
94-1
104-1
114-1
124-1
134-1
144-1
154-1
164-1
174-1
184-1
194-1
204-1
214-1
224-1
234-1
244-1
254-1
264-1
274-1
284-1
294-1
304-1
314-1

How December really feels in Grenchen

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.

Grenchen 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 / -2°83137.18.70.0
Feb / -2°7411.76.7100.2
Mar10° / 9014.14.911.62.0
Apr14° / 10315.62.213.33.4
May18° / 14617.90.214.84.6
Jun21° / 12°14017.5015.65.4
Jul23° / 14°14617.1015.35.9
Aug23° / 13°14916.30145.9
Sep19° / 10°10813.6012.45.3
Oct14° / 10213.40.410.63.5
Nov / 9613.33.69.11.0
Dec / -1°10014.26.48.40.0

Cloud cover in December

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 17% 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 71%.

0%25%50%75%100%151015202531
Clearer (%)Cloudier (%)
12773
22872
32872
42872
52872
62872
72971
83070
93070
103169
113070
123070
133070
143070
152971
162971
172971
182971
192971
202971
212971
222971
232872
242872
252971
262971
272872
282971
292971
302971
313070

Chance of precipitation in December

Any precipitationSnow

Grenchen gets around 100 mm of rain and snow over 14.2 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 46% and peaks near 47% on the wettest days, and about 6 days bring snow.

0%20%40%60%151015202531
Rain chance (%)Snow chance (%)
14318
24418
34418
44518
54519
64519
74519
84619
94619
104620
114620
124720
134720
144721
154721
164721
174721
184721
194721
204721
214722
224722
234722
244722
254622
264622
274622
284621
294521
304521
314521

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 7 km/h in December.

Across December, daily wind ranges from about 7 km/h on the calmest days to 8 km/h at its breeziest. It stays fairly steady from day to day.

0246810151015202531
Wind speed (km/h)Feels
17calm
27calm
37calm
47calm
57calm
67calm
77calm
87calm
97calm
107calm
117calm
128calm
138calm
148calm
158calm
168calm
178calm
188calm
198calm
208calm
218calm
228calm
238calm
248calm
258calm
268calm
278calm
288calm
298calm
307calm
317calm

Sunrise & sunset in December

DaylightNight

Daylight runs from about 8 h 36 min at the start of December to 8 h 18 min by month's end. The lit band spans sunrise to sunset each day.

Days shrink by about 18 minutes over December. Sunrise moves from 8:03 AM to 8:24 AM, and sunset from 4:37 PM to 4:44 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202531
Daylight (h)Sunrise (AM)Sunset (PM)
18.68:034:37
28.58:044:37
38.58:054:36
48.58:074:36
58.58:084:36
68.48:094:36
78.48:104:35
88.48:114:35
98.48:124:35
108.48:134:35
118.48:144:35
128.38:144:35
138.38:154:35
148.38:164:35
158.38:174:35
168.38:174:36
178.38:184:36
188.38:194:36
198.38:194:37
208.38:204:37
218.38:214:37
228.38:214:38
238.38:214:38
248.38:224:39
258.38:224:39
268.38:234:40
278.38:234:41
288.38:234:41
298.38:234:42
308.38:234:43
318.38:244:44

Solar energy in December

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in December, about 1.03 kWh/m² — the year's lowest.

For context, solar energy here swings from a low near 1.03 kWh/m² to a high of 5.59 kWh/m² in July across the year — December's 1.03 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
111.0Dim
121.0Dim
131.0Dim
141.0Dim
151.0Dim
161.0Dim
171.0Dim
181.0Dim
191.0Dim
201.0Dim
211.0Dim
221.0Dim
231.0Dim
241.0Dim
251.0Dim
261.0Dim
271.0Dim
281.0Dim
291.0Dim
301.0Dim
311.0Dim
Planning a trip in December

Is December a good time to visit Grenchen?

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 Grenchen.

What to pack for Grenchen in December

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

In December, Grenchen sees daytime highs around 4°C and nights near -1°C. Pack a warm layer and rain gear. Worth having: a heavy coat. About 14 days see rain.

a warm layerrain geara heavy coat

UV index in Grenchen 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 Grenchen 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
Feb2Low
Mar4Moderate
Apr5Moderate
May7High
Jun7Very high
Jul8Very high
Aug7High
Sep5Moderate
Oct3Moderate
Nov2Low
Dec1Low
Location & terrain

Where is Grenchen?

Grenchen sits at 47.2°N, 7.4°E, 454 m above sea level, in Switzerland. The nearest listed city is Solothurn, 11 km away.

BurgdorfBernKönizReinachAllschwilMuttenz

Topography around Grenchen

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

Within 3 km, the terrain around Grenchen has large variations in elevation — a maximum elevation change of 869 m around an average of 566 m above sea level; within 16 km, large variations in elevation — a maximum elevation change of 1,009 m; within 80 km, extreme variations in elevation — a maximum elevation change of 2,836 m.

The land around Grenchen is covered by trees (39%) and cropland (27%) within 3 km, trees (50%) and grassland (23%) within 16 km, and trees (47%) and grassland (32%) within 80 km.

3 km
869 m
16 km
1,009 m
80 km
2,836 m
treesgrasslandcroplandartificial surfaceswater
December weather nearby: Solothurn 11 km · Biel/Bienne 13 km · Burgdorf 23 km · Bern 27 km · Köniz 30 km · Reinach 37 km · Allschwil 41 km · Muttenz 41 km

Switzerland travel facts

Travel advisory
Level 1
Exercise Normal Precautions
Power plugs
Type C / J
230 V · 50 Hz
Prices
≈ 112% of US
price level, 2025
GDP per capita
$114,769
2025
Happiness
7.0 / 10
World Happiness, 2025
Safe drinking water
97%
of population, 2024
Homicide rate
0.6
per 100k, 2023
Road deaths
2.2
per 100k/yr, 2019
Income group
High
World Bank
English
High
EF EPI 564
Religion
Roman Catholic 34%none 29%Protestant 23%other Christian 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 Grenchen (47.1921°, 7.3959°, elevation 454 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).