Rantauprapat weather in December

In December, Rantauprapat sees average daytime highs of 29°C and overnight lows near 22°C, with 323 mm of rain across 28.9 wet days and about 11.9 hours of daylight. It is the 12th-warmest and 2nd-wettest month of the year here.

Day-to-day highs hold fairly steady near 29°C through the month. The sky is clear or mostly clear about 0% of the time in December, and the air most often feels oppressive.

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 Rantauprapat's 11th-clearest and 10th-windiest month. For the whole year in context, see Rantauprapat's year-round climate.

Daytime high
29°
12th warmest
Overnight low
22°
4th coldest
Rainfall
323 mm
28.9 wet days
Daylight
11 h 54 min
6:20 AM – 6:13 PM
Cloud cover
92%
11th clearest
Wind
3 km/h
10th windiest
Solar energy
4.03 kWh/m²
Travel score
2.8
out of 10

Rantauprapat is capital of Labuhanbatu Regency, Indonesia.

Founded
1991

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 29°C through the month.

A typical December day in Rantauprapat reaches about 29°C in the afternoon and slips back to 22°C overnight — a 7°C spread between the day's warmth and the night's chill. On most days the high lands between 27°C and 31°C. Set against its neighbours, December runs on par with November and on par with January.

20°25°30°35°151015202531
Avg high (°C)Avg low (°C)
13022
23022
33022
43022
53022
63022
73022
83022
92922
102922
112922
122922
132922
142922
152922
162922
172922
182922
192922
202922
212922
222922
232922
242922
252922
262922
272922
282922
292922
302922
312922

How December really feels in Rantauprapat

Once humidity and wind are folded in, December averages 31 days that feel above 32°C and 0 that feel at or below 0°C — the comfort signal a plain temperature reading hides.

Days feeling ≥ 32°C
31
heat index over the day's high
Days feeling ≤ C
0
wind chill below the day's low

The story in December is heat — humidity pushes the afternoon "feels like" well above the raw temperature.

Rantauprapat weather by month

How December compares with the rest of the year at a glance. December is the 12th-warmest and 2nd-wettest month here — the current month is highlighted below.

MonthHigh / Low (°C)Rainfall (mm)Wet daysDaylight (hours)Travel score
Jan30° / 22°23127.111.93.0
Feb30° / 22°18223.811.92.9
Mar31° / 22°22827.6122.6
Apr31° / 23°25428.4122.4
May31° / 23°21226.512.12.7
Jun31° / 23°15020.812.13.1
Jul31° / 22°15821.312.13.1
Aug31° / 22°19324.512.12.8
Sep31° / 22°25826.5122.7
Oct30° / 22°29928.5122.7
Nov30° / 22°34429.211.92.6
Dec29° / 22°32328.911.92.8

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 3% of December, with mostly cloudy or overcast conditions the remaining 97%.

0%25%50%75%100%151015202531
Clearer (%)Cloudier (%)
1397
2397
3397
4397
5397
6397
7397
8397
9397
10397
11298
12298
13298
14298
15298
16397
17397
18397
19397
20397
21397
22397
23397
24397
25496
26496
27496
28595
29595
30595
31793

Chance of precipitation in December

Any precipitation

Rantauprapat gets around 323 mm of rain over 28.9 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 94% and peaks near 96% on the wettest days.

0%20%40%60%80%100%151015202531
Rain chance (%)
196
296
396
495
595
695
794
894
994
1094
1194
1294
1394
1494
1594
1694
1794
1894
1994
2093
2193
2293
2393
2493
2593
2693
2792
2892
2991
3091
3190

Humidity in December

DryComfortableHumidMuggyOppressiveMiserable

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

By dew point, December lands in the oppressive band about 98% of days. Sticky, muggy-or-worse air turns up on roughly 100% of them.

0%25%50%75%100%151015202531
Muggy (%)Oppressive (%)Miserable (%)
10973
20982
30982
40982
50982
60982
70982
80982
90982
100982
110991
120991
130991
140991
150991
160991
170991
180991
190991
200991
210991
220991
230991
240991
251981
261981
271981
281981
291981
301981
312971

Wind in December

Winds average 3 km/h in December.

Across December, daily wind ranges from about 3 km/h on the calmest days to 3 km/h at its breeziest. It stays fairly steady from day to day.

0246810151015202531
Wind speed (km/h)Feels
13calm
23calm
33calm
43calm
53calm
63calm
73calm
83calm
93calm
103calm
113calm
123calm
133calm
143calm
153calm
163calm
173calm
183calm
193calm
203calm
213calm
223calm
233calm
243calm
253calm
263calm
273calm
283calm
293calm
303calm
313calm

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 6:14 AM to 6:27 AM, and sunset from 6:07 PM to 6:20 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202531
Daylight (h)Sunrise (AM)Sunset (PM)
111.96:146:07
211.96:146:07
311.96:156:08
411.96:156:08
511.96:156:09
611.96:166:09
711.96:166:09
811.96:176:10
911.96:176:10
1011.96:186:11
1111.96:186:11
1211.96:196:11
1311.96:196:12
1411.96:206:12
1511.96:206:13
1611.96:206:13
1711.96:216:14
1811.96:216:14
1911.96:226:15
2011.96:226:15
2111.96:236:16
2211.96:236:16
2311.96:246:16
2411.96:246:17
2511.96:256:17
2611.96:256:18
2711.96:266:18
2811.96:266:19
2911.96:276:19
3011.96:276:20
3111.96:276:20

Solar energy in December

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in December, about 4.03 kWh/m² — the year's lowest.

For context, solar energy here swings from a low near 4.03 kWh/m² to a high of 5.15 kWh/m² in March across the year — December's 4.03 kWh/m² sits near the bottom.

012345151015202531
Solar energy (kWh/m²)Level
14.0Bright
24.0Bright
34.0Bright
44.0Bright
54.0Bright
64.0Bright
74.0Bright
84.0Bright
94.0Bright
104.0Bright
114.0Bright
124.0Bright
134.0Bright
144.0Bright
154.0Bright
164.0Bright
174.0Bright
184.0Bright
194.0Bright
204.0Bright
214.0Bright
224.0Bright
234.1Bright
244.1Bright
254.1Bright
264.1Bright
274.1Bright
284.1Bright
294.2Bright
304.2Bright
314.2Bright
Planning a trip in December

Is December a good time to visit Rantauprapat?

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

2.8
Sightseeing
5th-best month of the year
3.8
Beach & pool
9th-best month of the year

December is a weaker month for outdoor sightseeing in Rantauprapat.

What to pack for Rantauprapat in December

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

In December, Rantauprapat sees daytime highs around 29°C and nights near 22°C. Pack light clothes and rain gear. About 29 days see rain.

light clothesrain gear

Sea temperature near Rantauprapat 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 68 km away) is warmest in May at about 30°C and coldest in January 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
Feb29Tropical
Mar30Tropical
Apr30Tropical
May30Tropical
Jun30Tropical
Jul30Tropical
Aug30Tropical
Sep30Tropical
Oct30Tropical
Nov29Tropical
Dec29Tropical

UV index in Rantauprapat in December

LowModerateHighVery highExtreme

Clear-sky midday UV in December peaks around 11 (very high — sun protection essential). The full-year curve, shaded by WHO exposure level, is below.

Under clear skies, the midday UV index in Rantauprapat peaks around February 21 at about 14 (extreme) — sunscreen, a hat and midday shade are essential. It bottoms out near June 19 at about 10 (very high).

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

025710JanFebMarAprMayJunJulAugSepOctNovDecExtremeExtremeFeb 21UV 14Jun 19UV 10
UV index (midday)Level
Jan12Extreme
Feb14Extreme
Mar14Extreme
Apr14Extreme
May12Extreme
Jun10Very high
Jul11Extreme
Aug11Extreme
Sep14Extreme
Oct13Extreme
Nov12Extreme
Dec11Extreme

Air quality in Rantauprapat 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 Rantauprapat is worst in October — around 37 µg/m³ PM2.5 (poor), and holds fairly steady the rest of the year.

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

010203040JanFebMarAprMayJunJulAugSepOctNovDecModeratePoorModerateOct 1037 µg/m³Dec 1725 µg/m³
PM2.5 (µg/m³)Level
Jan26Moderate
Feb30Moderate
Mar33Moderate
Apr31Moderate
May29Moderate
Jun27Moderate
Jul30Moderate
Aug32Moderate
Sep36Poor
Oct37Poor
Nov26Moderate
Dec25Moderate
Location & terrain

Where is Rantauprapat?

Rantauprapat sits at 2.1°N, 99.8°E, 29 m above sea level, in Indonesia. The nearest listed city is Bandar, 11 km away.

Topography around Rantauprapat

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

Within 3 km, the terrain around Rantauprapat has only modest variations in elevation — a maximum elevation change of 152 m around an average of 39 m above sea level; within 16 km, significant variations in elevation — a maximum elevation change of 434 m; within 80 km, very significant variations in elevation — a maximum elevation change of 2,230 m.

The land around Rantauprapat is covered by trees (65%) and artificial surfaces (30%) within 3 km, trees (96%) within 16 km, and trees (87%) within 80 km.

3 km
152 m
16 km
434 m
80 km
2,230 m
treesgrasslandcroplandartificial surfacesbare terrainwater
December weather nearby: Bandar 11 km · Tanjungbalai 96 km · Tarutung 97 km · Teluk Nibung 100 km · Kisaran 101 km · Padangsidempuan 102 km · Sibolga 124 km · Pematangsiantar 128 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 Rantauprapat (2.1°, 99.8333°, elevation 29 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. 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).