December is one of the cooler months of the year in Sitamarhi, with average highs near 25.1°C and lows around 11.3°C (mean 18.2°C). It is one of the drier months, averaging 6 mm of rainfall and 53% relative humidity across the period.
December is one of the cooler months of the year in Sitamarhi. Across 45 years of records, the warmest December in Sitamarhi was 2017 — when the month averaged 20°C — while the coldest was 2012 at 15.2°C. Typical December days reach 25.1°C with nights near 11.3°C. The long-term trend is cooling, about 0.2°C per decade.
December is one of the drier months in Sitamarhi, averaging 6 mm of rainfall. The wettest December on record was 1997 with 29 mm, while the driest were 2022, 2024 and 2025, among others at 0 mm.
Relative humidity in Sitamarhi during December averages 53%. The most humid December was 2021 at 79%, and the least humid was 1994 at 33%.
December receives about 3.2 kWh/m²/day of solar energy in Sitamarhi. The sunniest December was 2000 at 3.9 kWh/m²/day, and the cloudiest was 2014 at 2.4.
Average wind speed in Sitamarhi during December is 1.3 m/s. The windiest December was 2012 at 2 m/s, while the calmest were 2004, 2008 and 2011, among others at 1.1 m/s.
Ranked against the other 11 months using 1981–2025 averages.
| Metric | 1980s | 1990s | 2000s | 2010s | 2020s | Change |
|---|---|---|---|---|---|---|
| Avg Temp | 18.4°C | 18.8°C | 18.0°C | 17.8°C | 18.0°C | -0.4°C |
| Avg High | 25.5°C | 26.1°C | 24.8°C | 24.7°C | 24.3°C | -1.2°C |
| Avg Low | 11.4°C | 11.5°C | 11.3°C | 11.0°C | 11.6°C | +0.2°C |
| Avg Rain | 10 mm | 8 mm | 3 mm | 3 mm | 3 mm | -7 mm |
December temperatures in Sitamarhi have stayed relatively stable across the record.
December has ranged from a record low of 3.5°C (2019) to a record high of 30.4°C (2015).
Rainfall in December is one of the drier months, averaging 6 mm, with a wettest year of 29 mm.
Daytime highs and overnight lows have shifted differently — highs fell about 0.4°C per decade while lows rose 0°C per decade, narrowing the gap between day and night.
One of the best times to visit Sitamarhi
December is one of the best times to visit Sitamarhi. Expect days averaging 25.1°C and nights around 11.3°C (mean 18.2°C) — cooler than Sitamarhi's yearly average — with low rainfall (6 mm), so conditions are generally comfortable for sightseeing and outdoor plans.
| Year | Avg High | Avg Temp | Avg Low | Hottest Day | Coldest Day | Rainfall | Humidity | Wind | Solar |
|---|---|---|---|---|---|---|---|---|---|
| 2025 | 23.0°C | 16.7°C | 10.3°C | 25.3°C | 6.8°C | 0 mm | 75% | 1.2 m/s | — |
| 2024 | 25.4°C | 18.8°C | 12.2°C | 28.2°C | 7.8°C | 0 mm | 64% | 1.3 m/s | 3.1 |
| 2023 | 25.9°C | 19.8°C | 13.6°C | 30.1°C | 9.9°C | 4 mm | 63% | 1.2 m/s | 2.9 |
| 2022 | 24.9°C | 18.1°C | 11.3°C | 26.9°C | 7.4°C | 0 mm | 68% | 1.5 m/s | 2.9 |
| 2021 | 23.0°C | 17.4°C | 11.7°C | 26.9°C | 6.3°C | 14 mm | 79% | 1.4 m/s | 3.1 |
| 2020 | 23.9°C | 17.3°C | 10.7°C | 26.8°C | 6.1°C | 2 mm | 64% | 1.3 m/s | 2.7 |
| 2019 | 23.0°C | 16.6°C | 10.2°C | 27.5°C | 3.5°C | 21 mm | 67% | 1.5 m/s | 2.5 |
| 2018 | 25.6°C | 18.8°C | 12.1°C | 28.6°C | 5.4°C | 3 mm | 47% | 1.4 m/s | 3.1 |
| 2017 🔥 | 27.1°C | 20.0°C | 13.0°C | 30.4°C | 9.0°C | 0 mm | 51% | 1.3 m/s | 3 |
| 2016 | 25.9°C | 18.7°C | 11.5°C | 28.3°C | 8.2°C | 0 mm | 60% | 1.3 m/s | 2.6 |
| 2015 | 25.5°C | 18.8°C | 12.1°C | 30.4°C | 7.1°C | 0 mm | 48% | 1.3 m/s | 2.7 |
| 2014 | 23.8°C | 16.6°C | 9.4°C | 27.5°C | 5.7°C | 5 mm | 62% | 1.4 m/s | 2.4 |
| 2013 | 24.3°C | 17.8°C | 11.3°C | 26.9°C | 7.2°C | 0 mm | 67% | 1.3 m/s | 2.9 |
| 2012 ❄️ | 22.5°C | 15.2°C | 8.0°C | 26.4°C | 4.4°C | 0 mm | 61% | 2 m/s | 2.6 |
| 2011 | 24.4°C | 17.9°C | 11.3°C | 28.2°C | 6.6°C | 0 mm | 57% | 1.1 m/s | 2.5 |
| 2010 | 24.5°C | 17.7°C | 10.9°C | 28.3°C | 6.5°C | 1 mm | 56% | 1.3 m/s | 3.4 |
| 2009 | 24.4°C | 17.7°C | 11.0°C | 27.2°C | 6.2°C | 4 mm | 54% | 1.2 m/s | 3.1 |
| 2008 | 25.0°C | 19.1°C | 13.3°C | 27.5°C | 10.4°C | 0 mm | 69% | 1.1 m/s | 2.6 |
| 2007 | 23.1°C | 16.3°C | 9.6°C | 26.2°C | 5.3°C | 0 mm | 63% | 1.3 m/s | 3.3 |
| 2006 | 24.9°C | 18.2°C | 11.4°C | 27.3°C | 7.5°C | 9 mm | 56% | 1.2 m/s | 3.3 |
| 2005 | 25.3°C | 18.1°C | 10.8°C | 27.6°C | 7.7°C | 0 mm | 54% | 1.2 m/s | 3.7 |
| 2004 | 25.0°C | 18.5°C | 12.1°C | 27.5°C | 6.1°C | 0 mm | 56% | 1.1 m/s | 3.1 |
| 2003 | 24.9°C | 18.1°C | 11.4°C | 28.0°C | 7.9°C | 10 mm | 55% | 1.1 m/s | 3.3 |
| 2002 | 25.8°C | 18.8°C | 11.8°C | 29.1°C | 8.6°C | 9 mm | 43% | 1.2 m/s | 3 |
| 2001 | 24.4°C | 17.5°C | 10.5°C | 26.5°C | 7.4°C | 0 mm | 53% | 1.2 m/s | 2.8 |
| 2000 | 25.4°C | 18.2°C | 11.0°C | 27.3°C | 8.9°C | 0 mm | 42% | 1.2 m/s | 3.9 |
| 1999 | 27.0°C | 19.3°C | 11.6°C | 29.1°C | 8.8°C | 0 mm | 42% | 1.2 m/s | 3.5 |
| 1998 | 26.3°C | 18.9°C | 11.5°C | 29.5°C | 8.7°C | 0 mm | 45% | 1.2 m/s | 3.4 |
| 1997 🌧️ | 23.9°C | 17.6°C | 11.3°C | 28.7°C | 7.1°C | 29 mm | 58% | 1.5 m/s | 2.5 |
| 1996 | 26.3°C | 18.5°C | 10.8°C | 28.2°C | 6.7°C | 0 mm | 37% | 1.4 m/s | 3.7 |
| 1995 | 25.6°C | 18.5°C | 11.3°C | 27.9°C | 8.7°C | 27 mm | 47% | 1.3 m/s | 3.3 |
| 1994 | 26.9°C | 19.0°C | 11.2°C | 29.7°C | 6.3°C | 0 mm | 33% | 1.4 m/s | 3.8 |
| 1993 | 26.4°C | 19.1°C | 11.9°C | 28.6°C | 8.1°C | 0 mm | 35% | 1.2 m/s | 3.5 |
| 1992 | 26.2°C | 18.9°C | 11.6°C | 28.7°C | 9.2°C | 3 mm | 37% | 1.2 m/s | 3.6 |
| 1991 | 25.9°C | 18.8°C | 11.7°C | 28.9°C | 7.0°C | 16 mm | 43% | 1.4 m/s | 3.3 |
| 1990 | 26.7°C | 19.4°C | 12.0°C | 28.8°C | 8.2°C | 0 mm | 42% | 1.2 m/s | 3.7 |
| 1989 | 25.7°C | 18.5°C | 11.2°C | 29.7°C | 7.8°C | 7 mm | 37% | 1.3 m/s | 3.6 |
| 1988 | 26.8°C | 19.9°C | 13.0°C | 29.6°C | 9.4°C | 26 mm | 43% | 1.4 m/s | 3.7 |
| 1987 | 25.0°C | 18.2°C | 11.3°C | 27.6°C | 8.8°C | 2 mm | 57% | 1.2 m/s | 3.7 |
| 1986 | 25.6°C | 18.8°C | 12.0°C | 28.3°C | 8.0°C | 26 mm | 49% | 1.4 m/s | 3.4 |
| 1985 | 23.9°C | 17.6°C | 11.4°C | 26.3°C | 7.0°C | 7 mm | 66% | 1.4 m/s | 3.6 |
| 1984 | 25.9°C | 17.9°C | 10.0°C | 29.0°C | 5.7°C | 2 mm | 42% | 1.4 m/s | 3.5 |
| 1983 | 25.8°C | 18.6°C | 11.3°C | 28.6°C | 7.6°C | 7 mm | 39% | 1.4 m/s | — |
| 1982 | 25.6°C | 18.2°C | 10.7°C | 27.5°C | 7.2°C | 4 mm | 43% | 1.4 m/s | — |
| 1981 | 25.2°C | 18.3°C | 11.3°C | 27.9°C | 7.7°C | 12 mm | 53% | 1.4 m/s | — |
Actual recorded December data for each year, 1981–2025 — sourced from NASA POWER.
The average high in December is around 25.1°C with lows near 11.3°C (mean 18.2°C), based on 45 years of NASA POWER data.
December averages 6 mm of rainfall in Sitamarhi, one of the drier months. The wettest on record was 29 mm in 1997.
The hottest December reached 30.4°C in 2015. The coldest dipped to 3.5°C in 2019.
Comparing the earliest years on record (1981–1985) with the most recent (2021–2025), average December temperatures have risen by about 0.1°C — but days and nights have moved in opposite directions. Overnight lows rose from 10.9°C to 11.8°C while daytime highs eased from 25.3°C to 24.4°C, narrowing the gap between day and night.
December is one of the cooler months of the year in Sitamarhi and one of the drier months, so plan for around 25.1°C daytime highs and 11.3°C at night.
Not quite — December is the 2nd coolest month in Sitamarhi, averaging 18.2°C.
For December in Sitamarhi, pack light layers you can adjust through the day, with typical highs of 25.1°C and lows of 11.3°C.
Relative humidity in December averages 53% — relatively dry.
Average wind speed in December is 1.3 m/s. The windiest December on record averaged 2 m/s (2012).
The wettest December on record was 1997 with 29 mm. On average, December sees 6 mm.
All figures are derived from NASA POWER (Prediction Of Worldwide Energy Resources), based on MERRA-2 satellite reanalysis, covering 1981–2025.
Explore how the weather in Sitamarhi behaves each December, based on 45 years of NASA POWER climate data from 1981 to 2025. This page breaks down average temperatures, rainfall, humidity, wind and solar radiation for December specifically, along with year-by-year records and how the month has changed over the decades.
