Tarutung weather in December

In December, Tarutung sees average daytime highs of 26°C and overnight lows near 18°C, with 345 mm of rain across 28 wet days and about 11.9 hours of daylight. It is the 10th-warmest and 3rd-wettest month of the year here.

Day-to-day highs hold fairly steady near 26°C through the month. The sky is clear or mostly clear about 0% of the time in December, and the air most often feels muggy.

Daylight stretches from about 11 h 54 min at the start of December to 11 h 54 min by month's end. Set against the rest of the year, December is Tarutung's 10th-clearest and 9th-windiest month. For the whole year in context, see Tarutung's year-round climate.

Daytime high
26°
10th warmest
Overnight low
18°
10th coldest
Rainfall
345 mm
28 wet days
Daylight
11 h 54 min
6:24 AM – 6:17 PM
Cloud cover
94%
10th clearest
Wind
4 km/h
9th windiest
Solar energy
4.02 kWh/m²
Travel score
3.7
out of 10

Tarutung is capital of North Tapanuli Regency in North Sumatra Province, Indonesia.

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 26°C through the month.

A typical December day in Tarutung reaches about 26°C in the afternoon and slips back to 18°C overnight — a 8°C spread between the day's warmth and the night's chill. On most days the high lands between 24°C and 28°C. Set against its neighbours, December runs on par with November and on par with January.

15°20°25°30°151015202531
Avg high (°C)Avg low (°C)
12618
22618
32618
42618
52618
62618
72618
82618
92618
102618
112618
122618
132618
142618
152618
162618
172618
182618
192618
202618
212618
222618
232618
242618
252618
262618
272618
282618
292618
302618
312618

Tarutung weather by month

How December compares with the rest of the year at a glance. December is the 10th-warmest and 3rd-wettest month here — the current month is highlighted below.

MonthHigh / Low (°C)Rainfall (mm)Wet daysDaylight (hours)Travel score
Jan26° / 18°26124.811.94.1
Feb27° / 18°23521.711.94.2
Mar27° / 18°26626.2123.9
Apr27° / 18°32527.4123.6
May27° / 18°21823.412.14.2
Jun27° / 17°14218.112.14.9
Jul26° / 17°16719.612.14.9
Aug26° / 17°2412312.14.4
Sep26° / 17°25624.4124.1
Oct26° / 17°36126.7123.9
Nov26° / 18°40028.511.93.5
Dec26° / 18°3452811.93.7

Cloud cover in December

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 0% of the time in December.

Beyond those clear spells, partly cloudy skies cover about 2% of December, with mostly cloudy or overcast conditions the remaining 97%.

0%25%50%75%100%151015202531
Clearer (%)Cloudier (%)
1298
2298
3298
4298
5298
6298
7298
8298
9298
10298
11298
12298
13298
14298
15298
16298
17298
18298
19298
20298
21298
22298
23298
24298
25397
26397
27397
28496
29496
30595
31694

Chance of precipitation in December

Any precipitation

Tarutung gets around 345 mm of rain over 28 wet days in December. The line is the day-by-day chance of measurable precipitation.

Day to day, the chance of measurable rain averages around 90% and peaks near 94% on the wettest days.

0%20%40%60%80%100%151015202531
Rain chance (%)
194
293
393
493
592
692
791
891
990
1090
1190
1289
1389
1489
1589
1689
1790
1890
1990
2090
2190
2291
2391
2491
2590
2690
2789
2889
2988
3087
3186

Humidity in December

DryComfortableHumidMuggyOppressiveMiserable

Most of December feels muggy — the stacked bands show each day's mix of comfort levels, read off the dew point.

By dew point, December lands in the muggy band about 77% of days. Sticky, muggy-or-worse air turns up on roughly 77% of them.

0%25%50%75%100%151015202531
Humid (%)Muggy (%)
11981
21981
31981
41981
52080
62080
72080
82179
92179
102179
112179
122278
132278
142278
152278
162278
172278
182278
192278
202377
212377
222377
232377
242476
252476
262575
272575
282674
292773
302872
313070

Wind in December

Winds average 4 km/h in December.

Across December, daily wind ranges from about 4 km/h on the calmest days to 4 km/h at its breeziest. It stays fairly steady from day to day.

0246810151015202531
Wind speed (km/h)Feels
14calm
24calm
34calm
44calm
54calm
64calm
74calm
84calm
94calm
104calm
114calm
124calm
134calm
144calm
154calm
164calm
174calm
184calm
194calm
204calm
214calm
224calm
234calm
244calm
254calm
264calm
274calm
284calm
294calm
304calm
314calm

Sunrise & sunset in December

DaylightNight

Daylight runs from about 11 h 54 min at the start of December to 11 h 54 min by month's end. The lit band spans sunrise to sunset each day.

Days grow by about 0 minutes over December. Sunrise moves from 6:17 AM to 6:31 AM, and sunset from 6:11 PM to 6:24 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202531
Daylight (h)Sunrise (AM)Sunset (PM)
111.96:176:11
211.96:186:11
311.96:186:11
411.96:186:12
511.96:196:12
611.96:196:13
711.96:206:13
811.96:206:13
911.96:216:14
1011.96:216:14
1111.96:216:15
1211.96:226:15
1311.96:226:15
1411.96:236:16
1511.96:236:16
1611.96:246:17
1711.96:246:17
1811.96:256:18
1911.96:256:18
2011.96:266:19
2111.96:266:19
2211.96:276:20
2311.96:276:20
2411.96:286:21
2511.96:286:21
2611.96:286:22
2711.96:296:22
2811.96:296:22
2911.96:306:23
3011.96:306:23
3111.96:316:24

Solar energy in December

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in December, about 4.02 kWh/m².

For context, solar energy here swings from a low near 3.9 kWh/m² to a high of 5.14 kWh/m² in February across the year — December's 4.02 kWh/m² sits near the bottom.

012345151015202531
Solar energy (kWh/m²)Level
13.9Moderate
23.9Moderate
33.9Moderate
44.0Moderate
54.0Moderate
64.0Moderate
74.0Moderate
84.0Moderate
94.0Moderate
104.0Bright
114.0Bright
124.0Bright
134.0Bright
144.0Bright
154.0Bright
164.0Bright
174.0Bright
184.1Bright
194.1Bright
204.1Bright
214.1Bright
224.1Bright
234.1Bright
244.1Bright
254.1Bright
264.2Bright
274.2Bright
284.2Bright
294.3Bright
304.3Bright
314.3Bright
Planning a trip in December

Hazard calendar for Tarutung

In seasonPeak

In December, Tarutung sits inside its cyclone season. The full year is below, with each hazard's peak months called out.

Tarutung sits in the North Indian Ocean cyclone zone; the season peaks May and October–November.

Cyclone
Jan
Feb
Mar
Apr
May
Jun
Jul
Aug
Sep
Oct
Nov
Dec

Is December a good time to visit Tarutung?

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

3.7
Sightseeing
10th-best month of the year
3.6
Beach & pool
11th-best month of the year

December is a weaker month for outdoor sightseeing in Tarutung.

What to pack for Tarutung in December

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

In December, Tarutung sees daytime highs around 26°C and nights near 18°C. Pack rain gear. Worth having: light clothes. About 28 days see rain.

rain gearlight clothes

Sea temperature near Tarutung in December

The nearest coast averages about 29°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 41 km away) is warmest in March at about 30°C and coldest in November near 29°C.

The water stays above 20°C all year — warm enough for a swim any month.

28°30°32°JanFebMarAprMayJunJulAugSepOctNovDecwarmtropicalcomfortable to swim
Sea temperature (°C)Comfort
Jan29Tropical
Feb30Tropical
Mar30Tropical
Apr30Tropical
May30Tropical
Jun30Tropical
Jul30Tropical
Aug30Tropical
Sep30Tropical
Oct29Tropical
Nov29Tropical
Dec29Tropical

UV index in Tarutung in December

LowModerateHighVery highExtreme

Clear-sky midday UV in December peaks around 12 (very high — sun protection essential). The full-year curve, shaded by WHO exposure level, is below.

Under clear skies, the midday UV index in Tarutung peaks around February 21 at about 15 (extreme) — sunscreen, a hat and midday shade are essential. It bottoms out near June 18 at about 11 (extreme).

The index reaches 3 or more — the level where the WHO recommends sun protection — every month of the year.

025710JanFebMarAprMayJunJulAugSepOctNovDecExtremeFeb 21UV 15Jun 18UV 11
UV index (midday)Level
Jan12Extreme
Feb15Extreme
Mar14Extreme
Apr13Extreme
May12Extreme
Jun11Extreme
Jul11Extreme
Aug11Extreme
Sep14Extreme
Oct14Extreme
Nov12Extreme
Dec12Extreme

Air quality in Tarutung in December

GoodModeratePoorUnhealthyVery unhealthy

Average fine-particle pollution (PM2.5) through the year — so you can see where December falls, not just the annual average.

Air quality in Tarutung is worst in October — around 23 µg/m³ PM2.5 (moderate), and holds fairly steady the rest of the year.

Modeled monthly averages (CAMS reanalysis, 2015–2024).

0102030JanFebMarAprMayJunJulAugSepOctNovDecModerateOct 1123 µg/m³Dec 1015 µg/m³
PM2.5 (µg/m³)Level
Jan17Moderate
Feb20Moderate
Mar22Moderate
Apr19Moderate
May18Moderate
Jun18Moderate
Jul19Moderate
Aug18Moderate
Sep22Moderate
Oct23Moderate
Nov15Moderate
Dec15Moderate
Location & terrain

Where is Tarutung?

Tarutung sits at 2.0°N, 99.0°E, 948 m above sea level, in Indonesia. The nearest listed city is Sibolga, 37 km away.

Topography around Tarutung

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

Within 3 km, the terrain around Tarutung has significant variations in elevation — a maximum elevation change of 493 m around an average of 1,012 m above sea level; within 16 km, very significant variations in elevation — a maximum elevation change of 1,310 m; within 80 km, very significant variations in elevation — a maximum elevation change of 2,257 m.

The land around Tarutung is covered by trees (52%) and cropland (30%) within 3 km, trees (78%) within 16 km, and trees (73%) within 80 km.

3 km
493 m
16 km
1,310 m
80 km
2,257 m
treesgrasslandcroplandartificial surfaceswater
December weather nearby: Sibolga 37 km · Barus 63 km · Pangururan 72 km · Padangsidempuan 78 km · Bandar 87 km · Rantauprapat 97 km · Pematangsiantar 106 km · Paropo 107 km

Indonesia travel facts

Travel advisory
Level 2
Exercise Increased Caution
Power plugs
Type C / F
230 V · 50 Hz
Prices
≈ 29% of US
price level, 2025
GDP per capita
$5,060
2025
Happiness
5.6 / 10
World Happiness, 2025
Safe drinking water
30%
of population, 2024
Homicide rate
0.3
per 100k, 2022
Road deaths
11.3
per 100k/yr, 2019
Income group
Upper middle
World Bank
English
Low
EF EPI 471
Religion
Muslim 87%Protestant 8%Roman Catholic 3%Hindu 2%

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 Tarutung (2.0147°, 98.9655°, elevation 948 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. Tropical-cyclone seasons are the published climatological basin seasons (NOAA National Hurricane Center / regional warning centres). 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. Monthly air-quality (PM2.5) seasonality is from the CAMS EAC4 reanalysis (Copernicus Atmosphere Monitoring Service), scaled to the WHO annual mean where available. Topography is sampled from the Copernicus DEM GLO-90 elevation model (© ESA/Airbus) and ESA WorldCover 2021 land cover (CC BY 4.0).