Rauma weather in December

In December, Rauma sees average daytime highs of 2°C and overnight lows near -1°C, with 57 mm of precipitation across 12.9 wet days and about 5.3 hours of daylight. It is the 9th-warmest and 6th-wettest month of the year here.

Highs ease over the month, from about 3°C in the first days to 1°C by the end. The sky is clear or mostly clear about 12% of the time in December, and the air most often feels dry.

Daylight stretches from about 5 h 42 min at the start of December to 5 h 12 min by month's end. Set against the rest of the year, December is Rauma's 10th-clearest and 1st-windiest month. For the whole year in context, see Rauma's year-round climate.

Daytime high
9th warmest
Overnight low
-1°
4th coldest
Precipitation
57 mm
12.9 wet days
Daylight
5 h 06 min
9:56 AM – 3:04 PM
Cloud cover
79%
10th clearest
Wind
25 km/h
1st windiest
Solar energy
0.13 kWh/m²
Travel score
0.0
out of 10

Temperature in December

Average highAverage lowShaded bands: 10–90% of days

Highs ease over the month, from about 3°C in the first days to 1°C by the end.

A typical December day in Rauma reaches about 2°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 -4°C and 6°C. Set against its neighbours, December runs about 3°C cooler than November and about 2°C warmer than January.

-15°-10°-5°10°151015202531
Avg high (°C)Avg low (°C)
131
231
330
430
530
630
730
830
920
1020
1120
1220
1320
142-1
152-1
162-1
172-1
182-1
191-1
201-1
211-1
221-2
231-2
241-2
251-2
261-2
271-2
281-2
291-2
301-2
311-2

How December really feels in Rauma

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.

Rauma weather by month

How December compares with the rest of the year at a glance. December is the 9th-warmest and 6th-wettest month here — the current month is highlighted below.

MonthHigh / Low (°C)Rainfall (mm)Wet daysSnow daysDaylight (hours)Travel score
Jan-0° / -3°4510.996.10.0
Feb-1° / -5°348.47.58.50.0
Mar / -3°338.25.711.30.0
Apr / 327.41.814.30.2
May / 387.40.1172.0
Jun14° / 11°559.4018.74.0
Jul18° / 15°6410.30185.8
Aug18° / 15°7112.4015.55.5
Sep14° / 11°6410.6012.63.8
Oct / 7312.70.79.61.4
Nov / 6312.53.36.90.1
Dec / -1°5712.96.65.30.0

Cloud cover in December

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 12% of the time in December.

Beyond those clear spells, partly cloudy skies cover about 9% of December, with mostly cloudy or overcast conditions the remaining 79%.

0%25%50%75%100%151015202531
Clearer (%)Cloudier (%)
11981
21981
31981
41981
51981
61882
71981
81981
92080
102080
112080
122179
132179
142278
152278
162278
172377
182476
192476
202476
212476
222476
232476
242476
252476
262278
272278
282278
292278
302080
312080

Chance of precipitation in December

Any precipitationSnow

Rauma gets around 57 mm of rain and snow over 12.9 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 41% and peaks near 44% on the wettest days, and about 7 days bring snow.

0%10%20%30%40%50%151015202531
Rain chance (%)Snow chance (%)
14414
24415
34415
44415
54415
64316
74316
84317
94317
104318
114319
124220
134220
144121
154122
164122
174023
184023
194024
204024
214025
224025
234026
244026
254026
264026
274027
284027
294027
304027
314028

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 25 km/h in December, the windiest month of the year.

Across December, daily wind ranges from about 25 km/h on the calmest days to 25 km/h at its breeziest. It stays fairly steady from day to day.

0102030151015202531
Wind speed (km/h)Feels
125breezy
225breezy
325breezy
425breezy
525breezy
625breezy
725breezy
825breezy
925breezy
1025breezy
1125breezy
1225breezy
1325breezy
1425breezy
1525breezy
1625breezy
1725breezy
1825breezy
1925breezy
2025breezy
2125breezy
2225breezy
2325breezy
2425breezy
2525breezy
2625breezy
2725breezy
2825breezy
2925breezy
3025breezy
3125breezy

Sunrise & sunset in December

DaylightNight

Daylight runs from about 5 h 42 min at the start of December to 5 h 12 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 9:31 AM to 10:01 AM, and sunset from 3:16 PM to 3:14 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202531
Daylight (h)Sunrise (AM)Sunset (PM)
15.79:313:16
25.79:333:15
35.69:353:14
45.69:373:12
55.59:393:11
65.59:413:10
75.49:433:09
85.49:453:08
95.49:463:08
105.39:483:07
115.39:493:06
125.29:513:06
135.29:523:05
145.29:533:05
155.29:553:05
165.19:563:04
175.19:573:04
185.19:583:04
195.19:583:05
205.19:593:05
215.110:003:05
225.110:003:06
235.110:013:06
245.110:013:07
255.110:013:07
265.110:013:08
275.110:013:09
285.110:013:10
295.210:013:11
305.210:013:12
315.210:013:14

Solar energy in December

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in December, about 0.13 kWh/m² — the year's lowest.

For context, solar energy here swings from a low near 0.13 kWh/m² to a high of 6.13 kWh/m² in June across the year — December's 0.13 kWh/m² sits near the bottom.

00.511.52151015202531
Solar energy (kWh/m²)Level
10.2Dim
20.2Dim
30.2Dim
40.2Dim
50.1Dim
60.1Dim
70.1Dim
80.1Dim
90.1Dim
100.1Dim
110.1Dim
120.1Dim
130.1Dim
140.1Dim
150.1Dim
160.1Dim
170.1Dim
180.1Dim
190.1Dim
200.1Dim
210.1Dim
220.1Dim
230.1Dim
240.1Dim
250.1Dim
260.1Dim
270.1Dim
280.1Dim
290.1Dim
300.1Dim
310.1Dim
Planning a trip in December

Is December a good time to visit Rauma?

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

0.0
Sightseeing
9th-best month of the year
0.0
Beach & pool
5th-best month of the year

December is a weaker month for outdoor sightseeing in Rauma.

What to pack for Rauma in December

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

In December, Rauma sees daytime highs around 2°C and nights near -1°C. Pack a warm layer and a heavy coat. Worth having: rain gear and a windbreaker. About 13 days see rain.

a warm layera heavy coatrain geara windbreaker

Sea temperature near Rauma 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 offshore is warmest in August at about 17°C and coldest in March near 1°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
Jan2Bracing
Feb1Bracing
Mar1Bracing
Apr2Bracing
May5Bracing
Jun10Bracing
Jul15Cool
Aug17Cool
Sep14Bracing
Oct10Bracing
Nov7Bracing
Dec4Bracing

UV index in Rauma 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 Rauma peaks around June 15 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.

025710JanFebMarAprMayJunJulAugSepOctNovDecLowModerateLowJun 15UV 5Dec 19UV 0
UV index (midday)Level
Jan0Low
Feb1Low
Mar1Low
Apr2Moderate
May4Moderate
Jun5Moderate
Jul4Moderate
Aug4Moderate
Sep2Moderate
Oct1Low
Nov0Low
Dec0Low
Location & terrain

Where is Rauma?

Rauma sits at 61.1°N, 21.5°E, 14 m above sea level, in Finland. The nearest listed city is Pori, 42 km away.

VammalaNaantaliSastamalaRaisioTurkuLietoLoimaa

Topography around Rauma

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

Within 3 km, the terrain around Rauma has only modest variations in elevation — a maximum elevation change of 43 m around an average of 13 m above sea level; within 16 km, only modest variations in elevation — a maximum elevation change of 58 m; within 80 km, only modest variations in elevation — a maximum elevation change of 171 m.

The land around Rauma is covered by trees (54%) and artificial surfaces (29%) within 3 km, trees (53%) and water (31%) within 16 km, and trees (49%) and water (37%) within 80 km.

3 km
43 m
16 km
58 m
80 km
171 m
treesgrasslandcroplandartificial surfacesbare terrainwaterwetland
December weather nearby: Pori 42 km · Vammala 78 km · Naantali 78 km · Sastamala 79 km · Raisio 80 km · Turku 86 km · Lieto 86 km · Loimaa 89 km

Finland travel facts

Travel advisory
Level 1
Exercise Normal Precautions
Power plugs
Type C / F
230 V · 50 Hz
Prices
≈ 85% of US
price level, 2025
GDP per capita
$56,149
2025
Happiness
7.8 / 10
World Happiness, 2025
Safe drinking water
100%
of population, 2024
Homicide rate
1
per 100k, 2023
Road deaths
3.9
per 100k/yr, 2019
Income group
High
World Bank
English
Very high
EF EPI 603
Religion
Lutheran 67%none 31%other 2%Greek Orthodox 1%

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 Rauma (61.1272°, 21.5113°, elevation 14 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).