December is one of the cooler months of the year in Sitamarhi, with average highs near 28.1°C and lows around 7.4°C (mean 17.8°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 2023 — when the month averaged 20°C — while the coldest was 2012 at 15.4°C. Typical December days reach 28.1°C with nights near 7.4°C. The long-term trend is cooling, about 0.2°C per decade.
Ranked against the other 11 months using 1981–2025 averages.
| Metric | 1980s | 1990s | 2000s | 2010s | 2020s | Change |
|---|---|---|---|---|---|---|
| Avg Temp | 18.0°C | 18.3°C | 17.5°C | 17.3°C | 17.4°C | -0.6°C |
| Avg High | 28.3°C | 28.8°C | 27.4°C | 28.3°C | 27.4°C | -0.9°C |
| Avg Low | 7.7°C | 7.9°C | 7.6°C | 6.4°C | 7.4°C | -0.3°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.
A good time to visit Sitamarhi
December is a good time to visit Sitamarhi, with days averaging 28.1°C and nights around 7.4°C (mean 17.8°C, cooler than Sitamarhi's yearly average) and low rainfall. November and February are marginally more temperate, but December still suits most travellers.
| Year | High | Low | Avg | Rainfall | Humidity | Wind | Solar |
|---|---|---|---|---|---|---|---|
| 2025 | 25.3°C | 6.8°C | 16.1°C | 0 mm | 75% | 1.2 m/s | — |
| 2024 | 28.2°C | 7.8°C | 18.0°C | 0 mm | 64% | 1.3 m/s | 3.1 |
| 2023 🔥 | 30.1°C | 9.9°C | 20.0°C | 4 mm | 63% | 1.2 m/s | 2.9 |
| 2022 | 26.9°C | 7.4°C | 17.2°C | 0 mm | 68% | 1.5 m/s | 2.9 |
| 2021 | 26.9°C | 6.3°C | 16.6°C | 14 mm | 79% | 1.4 m/s | 3.1 |
| 2020 | 26.8°C | 6.1°C | 16.4°C | 2 mm | 64% | 1.3 m/s | 2.7 |
| 2019 | 27.5°C | 3.5°C | 15.5°C | 21 mm | 67% | 1.5 m/s | 2.5 |
| 2018 | 28.6°C | 5.4°C | 17.0°C | 3 mm | 47% | 1.4 m/s | 3.1 |
| 2017 | 30.4°C | 9.0°C | 19.7°C | 0 mm | 51% | 1.3 m/s | 3 |
| 2016 | 28.3°C | 8.2°C | 18.3°C | 0 mm | 60% | 1.3 m/s | 2.6 |
| 2015 | 30.4°C | 7.1°C | 18.7°C | 0 mm | 48% | 1.3 m/s | 2.7 |
| 2014 | 27.5°C | 5.7°C | 16.6°C | 5 mm | 62% | 1.4 m/s | 2.4 |
| 2013 | 26.9°C | 7.2°C | 17.1°C | 0 mm | 67% | 1.3 m/s | 2.9 |
| 2012 ❄️ | 26.4°C | 4.4°C | 15.4°C | 0 mm | 61% | 2 m/s | 2.6 |
| 2011 | 28.2°C | 6.6°C | 17.4°C | 0 mm | 57% | 1.1 m/s | 2.5 |
| 2010 | 28.3°C | 6.5°C | 17.4°C | 1 mm | 56% | 1.3 m/s | 3.4 |
| 2009 | 27.2°C | 6.2°C | 16.7°C | 4 mm | 54% | 1.2 m/s | 3.1 |
| 2008 | 27.5°C | 10.4°C | 19.0°C | 0 mm | 69% | 1.1 m/s | 2.6 |
| 2007 | 26.2°C | 5.3°C | 15.7°C | 0 mm | 63% | 1.3 m/s | 3.3 |
| 2006 | 27.3°C | 7.5°C | 17.4°C | 9 mm | 56% | 1.2 m/s | 3.3 |
| 2005 | 27.6°C | 7.7°C | 17.7°C | 0 mm | 54% | 1.2 m/s | 3.7 |
| 2004 | 27.5°C | 6.1°C | 16.8°C | 0 mm | 56% | 1.1 m/s | 3.1 |
| 2003 | 28.0°C | 7.9°C | 17.9°C | 10 mm | 55% | 1.1 m/s | 3.3 |
| 2002 | 29.1°C | 8.6°C | 18.9°C | 9 mm | 43% | 1.2 m/s | 3 |
| 2001 | 26.5°C | 7.4°C | 17.0°C | 0 mm | 53% | 1.2 m/s | 2.8 |
| 2000 | 27.3°C | 8.9°C | 18.1°C | 0 mm | 42% | 1.2 m/s | 3.9 |
| 1999 | 29.1°C | 8.8°C | 18.9°C | 0 mm | 42% | 1.2 m/s | 3.5 |
| 1998 | 29.5°C | 8.7°C | 19.1°C | 0 mm | 45% | 1.2 m/s | 3.4 |
| 1997 🌧️ | 28.7°C | 7.1°C | 17.9°C | 29 mm | 58% | 1.5 m/s | 2.5 |
| 1996 | 28.2°C | 6.7°C | 17.5°C | 0 mm | 37% | 1.4 m/s | 3.7 |
| 1995 | 27.9°C | 8.7°C | 18.3°C | 27 mm | 47% | 1.3 m/s | 3.3 |
| 1994 | 29.7°C | 6.3°C | 18.0°C | 0 mm | 33% | 1.4 m/s | 3.8 |
| 1993 | 28.6°C | 8.1°C | 18.4°C | 0 mm | 35% | 1.2 m/s | 3.5 |
| 1992 | 28.7°C | 9.2°C | 18.9°C | 3 mm | 37% | 1.2 m/s | 3.6 |
| 1991 | 28.9°C | 7.0°C | 17.9°C | 16 mm | 43% | 1.4 m/s | 3.3 |
| 1990 | 28.8°C | 8.2°C | 18.5°C | 0 mm | 42% | 1.2 m/s | 3.7 |
| 1989 | 29.7°C | 7.8°C | 18.7°C | 7 mm | 37% | 1.3 m/s | 3.6 |
| 1988 | 29.6°C | 9.4°C | 19.5°C | 26 mm | 43% | 1.4 m/s | 3.7 |
| 1987 | 27.6°C | 8.8°C | 18.2°C | 2 mm | 57% | 1.2 m/s | 3.7 |
| 1986 | 28.3°C | 8.0°C | 18.1°C | 26 mm | 49% | 1.4 m/s | 3.4 |
| 1985 | 26.3°C | 7.0°C | 16.7°C | 7 mm | 66% | 1.4 m/s | 3.6 |
| 1984 | 29.0°C | 5.7°C | 17.4°C | 2 mm | 42% | 1.4 m/s | 3.5 |
| 1983 | 28.6°C | 7.6°C | 18.1°C | 7 mm | 39% | 1.4 m/s | — |
| 1982 | 27.5°C | 7.2°C | 17.4°C | 4 mm | 43% | 1.4 m/s | — |
| 1981 | 27.9°C | 7.7°C | 17.8°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 28.1°C with lows near 7.4°C (mean 17.8°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. Daytime highs moved from 27.9°C to 27.5°C and overnight lows from 7°C to 7.6°C over the same span.
December is one of the cooler months of the year in Sitamarhi and one of the drier months, so plan for around 28.1°C daytime highs and 7.4°C at night.
Not quite — December is the 2nd coolest month in Sitamarhi, averaging 17.8°C.
For December in Sitamarhi, pack warm layers and a jacket for chilly mornings, with typical highs of 28.1°C and lows of 7.4°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.
