Rājbirāj weather in December

In December, Rājbirāj sees average daytime highs of 25°C and overnight lows near 13°C, with 4 mm of rain across 0.5 wet days and about 10.4 hours of daylight. It is the 11th-warmest and 11th-wettest month of the year here.

Highs ease over the month, from about 27°C in the first days to 24°C by the end. The sky is clear or mostly clear about 82% of the time in December, and the air most often feels dry.

Daylight stretches from about 10 h 30 min at the start of December to 10 h 24 min by month's end. Set against the rest of the year, December is Rājbirāj's 2nd-clearest and 10th-windiest month. For the whole year in context, see Rājbirāj's year-round climate.

Daytime high
25°
11th warmest
Overnight low
13°
2nd coldest
Rainfall
4 mm
0.5 wet days
Daylight
10 h 18 min
6:44 AM – 5:04 PM
Cloud cover
19%
2nd clearest
Wind
6 km/h
10th windiest
Solar energy
3.71 kWh/m²
Travel score
9.1
out of 10

Rājbirāj is municipality in Saptari District, Nepal.

Density
1,255/km²
people per km²
Founded
1950

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 27°C in the first days to 24°C by the end.

A typical December day in Rājbirāj reaches about 25°C in the afternoon and slips back to 13°C overnight — a 13°C spread between the day's warmth and the night's chill. On most days the high lands between 22°C and 27°C. Set against its neighbours, December runs about 4°C cooler than November and about 2°C warmer than January.

10°15°20°25°30°151015202531
Avg high (°C)Avg low (°C)
12714
22714
32714
42714
52714
62614
72614
82614
92613
102613
112613
122613
132513
142513
152513
162513
172512
182512
192512
202512
212412
222412
232412
242412
252412
262411
272411
282411
292411
302411
312311

How December really feels in Rājbirāj

Once humidity and wind are folded in, December averages 0 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
0
heat index over the day's high
Days feeling ≤ C
0
wind chill below the day's low

December sits comfortably in between — no days that feel dangerously hot or drop to a hard freeze once humidity and wind are folded in.

Rājbirāj weather by month

How December compares with the rest of the year at a glance. December is the 11th-warmest and 11th-wettest month here — the current month is highlighted below.

MonthHigh / Low (°C)Rainfall (mm)Wet daysDaylight (hours)Travel score
Jan23° / 11°121.610.58.9
Feb27° / 14°141.911.18.2
Mar33° / 19°162.711.84.8
Apr36° / 23°406.812.62.4
May35° / 25°12113.913.32.3
Jun33° / 26°29523.313.62.3
Jul32° / 26°42729.113.52.2
Aug32° / 26°34529.112.92.2
Sep32° / 26°30823.812.22.8
Oct31° / 22°766.911.45.1
Nov29° / 17°30.510.77.5
Dec25° / 13°40.510.49.1

Cloud cover in December

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 82% of the time in December.

Beyond those clear spells, partly cloudy skies cover about 8% of December, with mostly cloudy or overcast conditions the remaining 9%.

0%25%50%75%100%151015202531
Clearer (%)Cloudier (%)
1919
2928
3928
4928
5919
6919
7919
8919
99010
109010
119010
129010
139010
149010
159010
169010
179010
189010
199010
20919
21919
22919
23919
24919
25919
269010
279010
289010
299010
309010
319010

Chance of precipitation in December

Any precipitation

Rājbirāj gets around 4 mm of rain over 0.5 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 2% and peaks near 4% on the wettest days.

0%10%20%30%151015202531
Rain chance (%)
10
20
30
41
51
61
71
81
91
101
111
122
132
142
152
162
172
182
192
202
212
223
233
243
253
263
274
284
294
304
314

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 57% of days. It rarely turns muggy — the humid and sticky bands barely register.

0%25%50%75%100%151015202531
Dry (%)Comfortable (%)Humid (%)
1265717
2275815
3295714
4305713
5325612
6345511
7365410
839529
941509
1044498
1146477
1249456
1352435
1454415
1557394
1660373
1762353
1865332
1967312
2069292
2172271
2273261
2375241
2476231
2577221
2679201
2780191
2881181
2982171
3083161
3183161

Wind in December

Winds average 6 km/h in December.

Across December, daily wind ranges from about 6 km/h on the calmest days to 6 km/h at its breeziest. It stays fairly steady from day to day.

0246810151015202531
Wind speed (km/h)Feels
16calm
26calm
36calm
46calm
56calm
66calm
76calm
86calm
96calm
106calm
116calm
126calm
136calm
146calm
156calm
166calm
176calm
186calm
196calm
206calm
216calm
226calm
236calm
246calm
256calm
266calm
276calm
286calm
296calm
306calm
316calm

Sunrise & sunset in December

DaylightNight

Daylight runs from about 10 h 30 min at the start of December to 10 h 24 min by month's end. The lit band spans sunrise to sunset each day.

Days shrink by about 6 minutes over December. Sunrise moves from 6:34 AM to 6:51 AM, and sunset from 5:01 PM to 5:12 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202531
Daylight (h)Sunrise (AM)Sunset (PM)
110.56:345:01
210.46:355:01
310.46:365:01
410.46:365:02
510.46:375:02
610.46:385:02
710.46:385:02
810.46:395:02
910.46:405:02
1010.46:405:03
1110.46:415:03
1210.46:425:03
1310.46:425:03
1410.46:435:04
1510.36:435:04
1610.36:445:04
1710.36:445:05
1810.36:455:05
1910.36:465:06
2010.36:465:06
2110.36:475:06
2210.36:475:07
2310.36:475:07
2410.36:485:08
2510.36:485:08
2610.36:495:09
2710.36:495:10
2810.36:505:10
2910.36:505:11
3010.46:505:11
3110.46:515:12

Solar energy in December

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in December, about 3.71 kWh/m² — the year's lowest.

For context, solar energy here swings from a low near 3.71 kWh/m² to a high of 6.31 kWh/m² in April across the year — December's 3.71 kWh/m² sits near the bottom.

01234151015202531
Solar energy (kWh/m²)Level
13.8Moderate
23.8Moderate
33.8Moderate
43.8Moderate
53.8Moderate
63.7Moderate
73.7Moderate
83.7Moderate
93.7Moderate
103.7Moderate
113.7Moderate
123.7Moderate
133.7Moderate
143.7Moderate
153.7Moderate
163.7Moderate
173.7Moderate
183.7Moderate
193.7Moderate
203.7Moderate
213.7Moderate
223.7Moderate
233.7Moderate
243.7Moderate
253.7Moderate
263.7Moderate
273.8Moderate
283.8Moderate
293.8Moderate
303.8Moderate
313.8Moderate
Planning a trip in December

Hazard calendar for Rājbirāj

In seasonPeak

None of Rājbirāj's seasonal hazards are active in December. The full-year calendar below shows when the rainy season, cyclone risk and dust haze do peak.

Rājbirāj's monsoon runs June–September, when most of the year's rain falls.

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

Is December a good time to visit Rājbirāj?

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

9.1
Sightseeing
1st-best month of the year
8.2
Beach & pool
3rd-best month of the year

December is one of the better times to visit Rājbirāj for general sightseeing. The water and warmth also suit a beach or pool day.

What to pack for Rājbirāj in December

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

In December, Rājbirāj sees daytime highs around 25°C and nights near 13°C. Worth packing: light clothes.

light clothes

UV index in Rājbirāj in December

LowModerateHighVery highExtreme

Clear-sky midday UV in December peaks around 4 — enough to warrant sun protection. The full-year curve, shaded by WHO exposure level, is below.

Under clear skies, the midday UV index in Rājbirāj peaks around July 19 at about 11 (extreme) — sunscreen, a hat and midday shade are essential. It bottoms out near January 20 at about 4 (moderate).

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

025710JanFebMarAprMayJunJulAugSepOctNovDecModerateVery highVery highModerateJul 19UV 11Jan 20UV 4
UV index (midday)Level
Jan4Moderate
Feb4Moderate
Mar8Very high
Apr7High
May8Very high
Jun7High
Jul11Extreme
Aug9Very high
Sep10Very high
Oct6High
Nov4Moderate
Dec4Moderate

Air quality in Rājbirāj 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 Rājbirāj is worst in January — around 243 µg/m³ PM2.5 (very unhealthy), about 5.3× the cleanest month (July, 46 µg/m³).

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

0306090120150180210240270JanFebMarAprMayJunJulAugSepOctNovDecVery unhealthyUnhealthyPoorUnhealthyVery unhealthyJan 12241 µg/m³Jul 1747 µg/m³
PM2.5 (µg/m³)Level
Jan243Very unhealthy
Feb196Very unhealthy
Mar138Unhealthy
Apr97Unhealthy
May75Unhealthy
Jun62Unhealthy
Jul46Poor
Aug58Unhealthy
Sep73Unhealthy
Oct124Unhealthy
Nov191Very unhealthy
Dec231Very unhealthy
Location & terrain

Where is Rājbirāj?

Rājbirāj sits at 26.5°N, 86.7°E, 89 m above sea level, in Nepal. The nearest listed city is Triyuga, 28 km away.

BiratnagarĪṭahari̇̄SirahaDharānDhankutā

Topography around Rājbirāj

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

Within 3 km, the terrain around Rājbirāj has only modest variations in elevation — a maximum elevation change of 27 m around an average of 83 m above sea level; within 16 km, significant variations in elevation — a maximum elevation change of 378 m; within 80 km, extreme variations in elevation — a maximum elevation change of 2,952 m.

The land around Rājbirāj is covered by cropland (69%) within 3 km, cropland (67%) and trees (20%) within 16 km, and cropland (56%) and trees (38%) within 80 km.

3 km
27 m
16 km
378 m
80 km
2,952 m
treesgrasslandcroplandartificial surfacesbare terrainwater
December weather nearby: Triyuga 28 km · Lahān 33 km · Inaruwa 40 km · Biratnagar 53 km · Īṭahari̇̄ 54 km · Siraha 55 km · Dharān 61 km · Dhankutā 76 km

Nepal travel facts

Travel advisory
Level 2
Exercise Increased Caution
Power plugs
Type C / D / M
230 V · 50 Hz
Prices
≈ 24% of US
price level, 2025
GDP per capita
$1,536
2025
Happiness
5.1 / 10
World Happiness, 2025
Safe drinking water
16%
of population, 2024
Homicide rate
2.1
per 100k, 2020
Road deaths
16.3
per 100k/yr, 2019
Income group
Lower middle
World Bank
English
Moderate
EF EPI 514
Religion
Hindu 81%Buddhist 8%Muslim 5%Kirat 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 Rājbirāj (26.5397°, 86.748°, elevation 89 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. 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).