Boo weather in December

In December, Boo sees average daytime highs of 2°C and overnight lows near -1°C, with 51 mm of precipitation across 11.4 wet days and about 5.9 hours of daylight. It is the 10th-warmest and 7th-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 15% of the time in December, and the air most often feels dry.

Daylight stretches from about 6 h 18 min at the start of December to 5 h 48 min by month's end. Set against the rest of the year, December is Boo's 11th-clearest and 1st-windiest month. For the whole year in context, see Boo's year-round climate.

Daytime high
10th warmest
Overnight low
-1°
4th coldest
Precipitation
51 mm
11.4 wet days
Daylight
5 h 48 min
8:50 AM – 2:37 PM
Cloud cover
76%
11th clearest
Wind
20 km/h
1st windiest
Solar energy
0.21 kWh/m²
Travel score
0.0
out of 10

Boo is urban area in Nacka Municipality, Sweden.

Density
1,458/km²
people per km²

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 3°C in the first days to 1°C by the end.

A typical December day in Boo 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 -2°C and 6°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)
141
241
341
431
530
630
730
830
930
1030
1130
1230
133-1
142-1
152-1
162-1
172-1
182-1
192-1
202-1
212-2
222-2
231-2
241-2
251-2
261-2
271-2
281-2
291-2
301-2
311-2

How December really feels in Boo

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.

Boo weather by month

How December compares with the rest of the year at a glance. December is the 10th-warmest and 7th-wettest month here — the current month is highlighted below.

MonthHigh / Low (°C)Rainfall (mm)Wet daysSnow daysDaylight (hours)Travel score
Jan / -2°398.86.26.60.0
Feb / -3°328.26.68.70.0
Mar / -1°307.94.611.30.0
Apr / 327.51.714.11.0
May12° / 398.30.116.63.2
Jun16° / 11°6110.3018.15.0
Jul19° / 14°6110017.56.2
Aug19° / 14°6511.5015.35.9
Sep15° / 10°518.7012.64.5
Oct10° / 5410.50.29.82.0
Nov / 5411.337.30.2
Dec / -1°5111.45.55.90.0

Cloud cover in December

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 15% of the time in December.

Beyond those clear spells, partly cloudy skies cover about 10% of December, with mostly cloudy or overcast conditions the remaining 74%. Skies tend to open up as the month goes on.

0%25%50%75%100%151015202531
Clearer (%)Cloudier (%)
11981
21981
31981
41981
52080
62179
72179
82179
92278
102377
112476
122476
132575
142773
152773
162872
172872
183070
193070
203070
213070
223070
233070
243070
253070
262971
272971
282971
292872
302872
312872

Chance of precipitation in December

Any precipitationSnow

Boo gets around 51 mm of rain and snow over 11.4 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 38% on the wettest days, and about 6 days bring snow.

0%10%20%30%40%50%151015202531
Rain chance (%)Snow chance (%)
13814
23814
33814
43814
53814
63814
73814
83814
93815
103815
113815
123816
133816
143716
153717
163617
173618
183619
193619
203620
213620
223621
233621
243521
253522
263522
273522
283522
293522
303522
313522

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

Across December, daily wind ranges from about 20 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
120light breeze
220light breeze
320light breeze
420light breeze
520light breeze
620light breeze
720light breeze
820light breeze
920light breeze
1020light breeze
1120light breeze
1220light breeze
1320light breeze
1420light breeze
1520light breeze
1620light breeze
1720light breeze
1820light breeze
1920light breeze
2020light breeze
2120breezy
2220breezy
2320breezy
2420breezy
2520breezy
2620breezy
2720breezy
2820breezy
2920breezy
3020breezy
3120breezy

Sunrise & sunset in December

DaylightNight

Daylight runs from about 6 h 18 min at the start of December to 5 h 48 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 8:28 AM to 8:55 AM, and sunset from 2:46 PM to 2:45 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202531
Daylight (h)Sunrise (AM)Sunset (PM)
16.38:282:46
26.38:292:45
36.28:312:43
46.28:332:42
56.18:352:42
66.18:362:41
76.08:382:40
86.08:402:39
96.08:412:39
105.98:422:38
115.98:442:38
125.98:452:37
135.88:462:37
145.88:472:37
155.88:492:37
165.88:502:37
175.88:502:37
185.88:512:37
195.78:522:37
205.78:532:37
215.78:532:37
225.78:542:38
235.78:542:38
245.78:552:39
255.78:552:40
265.88:552:40
275.88:552:41
285.88:552:42
295.88:552:43
305.88:552:44
315.88:552:45

Solar energy in December

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in December, about 0.21 kWh/m² — the year's lowest.

For context, solar energy here swings from a low near 0.21 kWh/m² to a high of 5.98 kWh/m² in June across the year — December's 0.21 kWh/m² sits near the bottom.

00.511.52151015202531
Solar energy (kWh/m²)Level
10.3Dim
20.3Dim
30.2Dim
40.2Dim
50.2Dim
60.2Dim
70.2Dim
80.2Dim
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
300.2Dim
310.2Dim
Planning a trip in December

Is December a good time to visit Boo?

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
6th-best month of the year

December is a weaker month for outdoor sightseeing in Boo.

What to pack for Boo in December

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

In December, Boo 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 11 days see rain.

a warm layera heavy coatrain geara windbreaker

Sea temperature near Boo in December

The nearest coast averages about 5°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 24 km away) is warmest in August at about 17°C and coldest in March near 2°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
Jan3Bracing
Feb2Bracing
Mar2Bracing
Apr3Bracing
May7Bracing
Jun12Bracing
Jul16Cool
Aug17Cool
Sep14Bracing
Oct10Bracing
Nov7Bracing
Dec5Bracing

UV index in Boo 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 Boo peaks around June 17 at about 5 (high) — 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.

025710JanFebMarAprMayJunJulAugSepOctNovDecLowModerateModerateLowJun 17UV 5Dec 19UV 0
UV index (midday)Level
Jan0Low
Feb1Low
Mar2Low
Apr3Moderate
May4Moderate
Jun5High
Jul5Moderate
Aug4Moderate
Sep3Moderate
Oct1Low
Nov0Low
Dec0Low
Location & terrain

Where is Boo?

Boo sits at 59.3°N, 18.3°E, 37 m above sea level, in Sweden. The nearest listed city is Gustavsberg, 6.0 km away.

Topography around Boo

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

Within 3 km, the terrain around Boo has only modest variations in elevation — a maximum elevation change of 73 m around an average of 29 m above sea level; within 16 km, only modest variations in elevation — a maximum elevation change of 100 m; within 80 km, only modest variations in elevation — a maximum elevation change of 109 m.

The land around Boo is covered by trees (68%) within 3 km, trees (54%) and water (30%) within 16 km, and water (46%) and trees (39%) within 80 km.

3 km
73 m
16 km
100 m
80 km
109 m
treesgrasslandcroplandartificial surfaceswater
December weather nearby: Gustavsberg 6.0 km · Nacka 7.0 km · Lidingö 9.0 km · Östermalm 11 km · Södermalm 12 km · Stockholm 12 km · Kungsholmen 14 km · Årsta 14 km

Sweden travel facts

Travel advisory
Level 2
Exercise Increased Caution
Power plugs
Type C / F
230 V · 50 Hz
Prices
≈ 87% of US
price level, 2025
GDP per capita
$63,133
2025
Happiness
7.3 / 10
World Happiness, 2025
Safe drinking water
100%
of population, 2024
Homicide rate
1.1
per 100k, 2023
Road deaths
3.1
per 100k/yr, 2019
Income group
High
World Bank
English
Very high
EF EPI 609
Religion
Church of Sweden 54%none or unspecified 37%other 9%

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 Boo (59.3333°, 18.2833°, elevation 37 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).