Porsgrunn weather in December

In December, Porsgrunn sees average daytime highs of 1°C and overnight lows near -3°C, with 84 mm of precipitation across 12.2 wet days and about 5.9 hours of daylight. It is the 10th-warmest and 8th-wettest month of the year here.

Highs ease over the month, from about 2°C in the first days to 0°C by the end. The sky is clear or mostly clear about 21% of the time in December, and the air most often feels dry.

Daylight stretches from about 6 h 24 min at the start of December to 5 h 54 min by month's end. Set against the rest of the year, December is Porsgrunn's 11th-clearest and 2nd-windiest month. For the whole year in context, see Porsgrunn's year-round climate.

Daytime high
10th warmest
Overnight low
-3°
3rd coldest
Precipitation
84 mm
12.2 wet days
Daylight
5 h 48 min
9:22 AM – 3:13 PM
Cloud cover
70%
11th clearest
Wind
12 km/h
2nd windiest
Solar energy
0.24 kWh/m²
Travel score
0.0
out of 10

Porsgrunn is town in Porsgrunn Municipality, Norway.

Air quality
Good
PM2.5 7.4 µg/m³ · 2019
Founded
1807

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 2°C in the first days to 0°C by the end.

A typical December day in Porsgrunn reaches about 1°C in the afternoon and slips back to -3°C overnight — a 4°C spread between the day's warmth and the night's chill. On most days the high lands between -5°C and 7°C. Set against its neighbours, December runs about 3°C cooler than November and about 1°C warmer than January.

-15°-10°-5°10°151015202531
Avg high (°C)Avg low (°C)
13-1
22-2
32-2
42-2
52-2
62-2
72-2
82-2
92-3
102-3
111-3
121-3
131-3
141-3
151-3
161-3
171-4
181-4
191-4
201-4
211-4
220-4
230-4
240-4
250-4
260-4
270-4
280-4
290-5
300-5
310-5

How December really feels in Porsgrunn

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.

Porsgrunn weather by month

How December compares with the rest of the year at a glance. December is the 10th-warmest and 8th-wettest month here — the current month is highlighted below.

MonthHigh / Low (°C)Rainfall (mm)Wet daysSnow daysDaylight (hours)Travel score
Jan / -5°9212.210.36.60.0
Feb / -5°629.38.48.80.0
Mar / -3°638.76.611.30.2
Apr10° / 599.43.514.12.1
May15° / 7410.80.616.64.3
Jun18° / 10°9412.50185.5
Jul20° / 12°9912.5017.45.9
Aug20° / 12°10613.4015.25.7
Sep15° / 10111.5012.64.4
Oct10° / 10712.51.59.81.9
Nov / 108135.37.40.1
Dec / -3°8412.285.90.0

Cloud cover in December

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 21% 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
33070
43070
53070
63070
73070
83070
93169
103169
113268
123268
133367
143466
153466
163466
173466
183466
193466
203466
213466
223565
233565
243565
253565
263565
273664
283565
293565
303565
313565

Chance of precipitation in December

Any precipitationSnow

Porsgrunn gets around 84 mm of rain and snow over 12.2 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 40% and peaks near 46% on the wettest days, and about 8 days bring snow. The odds ease toward the end of the month.

0%20%40%60%151015202531
Rain chance (%)Snow chance (%)
14626
24626
34626
44526
54526
64426
74426
84326
94226
104225
114125
124024
133924
143823
153723
163623
173623
183624
193624
203624
213625
223625
233626
243626
253627
263727
273728
283829
293829
303930
314031

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 12 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
112calm
212calm
312calm
412calm
512calm
612calm
712calm
812calm
912calm
1012calm
1112calm
1212calm
1312calm
1412calm
1512calm
1612calm
1712calm
1812calm
1912calm
2012calm
2112calm
2212calm
2312calm
2412calm
2512calm
2612calm
2712light breeze
2812light breeze
2912light breeze
3012light breeze
3112light breeze

Sunrise & sunset in December

DaylightNight

Daylight runs from about 6 h 24 min at the start of December to 5 h 54 min by month's end. The lit band spans sunrise to sunset each day.

Days shrink by about 30 minutes over December. Sunrise moves from 9:01 AM to 9:27 AM, and sunset from 3:22 PM to 3:22 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202531
Daylight (h)Sunrise (AM)Sunset (PM)
16.49:013:22
26.39:023:21
36.39:043:20
46.29:063:19
56.29:083:18
66.19:093:17
76.19:113:16
86.19:123:16
96.09:143:15
106.09:153:14
116.09:173:14
125.99:183:14
135.99:193:13
145.99:203:13
155.99:213:13
165.89:223:13
175.89:233:13
185.89:243:13
195.89:253:13
205.89:253:13
215.89:263:14
225.89:263:14
235.89:273:15
245.89:273:15
255.89:273:16
265.89:283:17
275.89:283:18
285.89:283:19
295.99:283:19
305.99:283:21
315.99:273:22

Solar energy in December

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in December, about 0.24 kWh/m² — the year's lowest.

For context, solar energy here swings from a low near 0.24 kWh/m² to a high of 5.78 kWh/m² in June across the year — December's 0.24 kWh/m² sits near the bottom.

00.511.52151015202531
Solar energy (kWh/m²)Level
10.3Dim
20.3Dim
30.3Dim
40.3Dim
50.3Dim
60.3Dim
70.3Dim
80.3Dim
90.2Dim
100.2Dim
110.2Dim
120.2Dim
130.2Dim
140.2Dim
150.2Dim
160.2Dim
170.2Dim
180.2Dim
190.2Dim
200.2Dim
210.2Dim
220.2Dim
230.2Dim
240.2Dim
250.2Dim
260.2Dim
270.2Dim
280.2Dim
290.2Dim
300.3Dim
310.3Dim
Planning a trip in December

Is December a good time to visit Porsgrunn?

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
7th-best month of the year

December is a weaker month for outdoor sightseeing in Porsgrunn.

What to pack for Porsgrunn in December

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

In December, Porsgrunn sees daytime highs around 1°C and nights near -3°C. Pack a warm layer and a heavy coat. Worth having: rain gear. About 12 days see rain.

a warm layera heavy coatrain gear

Sea temperature near Porsgrunn in December

The nearest coast averages about 6°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 30 km away) is warmest in August at about 18°C and coldest in February near 3°C.

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

0°5°10°15°20°JanFebMarAprMayJunJulAugSepOctNovDecbracingcoolrefreshing
Sea temperature (°C)Comfort
Jan5Bracing
Feb3Bracing
Mar4Bracing
Apr6Bracing
May11Bracing
Jun15Bracing
Jul17Cool
Aug18Cool
Sep15Cool
Oct12Bracing
Nov9Bracing
Dec6Bracing

UV index in Porsgrunn 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 Porsgrunn peaks around July 20 at about 5 (moderate) — a little sun protection helps at midday. It bottoms out near December 19 at about 0 (low).

The index reaches 3 or more — the level where the WHO recommends sun protection — in 4 months of the year.

025710JanFebMarAprMayJunJulAugSepOctNovDecLowModerateLowJul 20UV 5Dec 19UV 0
UV index (midday)Level
Jan0Low
Feb1Low
Mar2Low
Apr3Moderate
May4Moderate
Jun4Moderate
Jul5Moderate
Aug5Moderate
Sep3Moderate
Oct1Low
Nov0Low
Dec0Low
Location & terrain

Where is Porsgrunn?

Porsgrunn sits at 59.1°N, 9.7°E, 9 m above sea level, in Norway. The nearest listed city is Skien, 8.0 km away.

Topography around Porsgrunn

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

Within 3 km, the terrain around Porsgrunn has significant variations in elevation — a maximum elevation change of 254 m around an average of 48 m above sea level; within 16 km, significant variations in elevation — a maximum elevation change of 548 m; within 80 km, very significant variations in elevation — a maximum elevation change of 1,422 m.

The land around Porsgrunn is covered by trees (46%) and artificial surfaces (23%) within 3 km, trees (73%) within 16 km, and trees (59%) and water (31%) within 80 km.

3 km
254 m
16 km
548 m
80 km
1,422 m
treesgrasslandcroplandartificial surfaceswater
December weather nearby: Skien 8.0 km · Larvik 24 km · Sandefjord 32 km · Tønsberg 45 km · Horten 56 km · Kongsberg 59 km · Moss 66 km · Fredrikstad 73 km

Norway travel facts

Travel advisory
Level 1
Exercise Normal Precautions
Power plugs
Type C / F
230 V · 50 Hz
Prices
≈ 91% of US
price level, 2025
GDP per capita
$94,594
2025
Happiness
7.2 / 10
World Happiness, 2025
Safe drinking water
99%
of population, 2024
Homicide rate
0.7
per 100k, 2023
Road deaths
2.1
per 100k/yr, 2019
Income group
High
World Bank
English
Very high
EF EPI 613
Religion
Church of Norway 68%other Christian 4%Muslim 3%Roman Catholic 3%

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 Porsgrunn (59.1405°, 9.6561°, elevation 9 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).