December is one of the cooler months of the year in Samastipur, with average highs near 25.3°C and lows around 10.8°C (mean 18.1°C). It is one of the drier months, averaging 5 mm of rainfall and 54% relative humidity across the period.
December is one of the cooler months of the year in Samastipur. Across 45 years of records, the warmest December in Samastipur was 2017 — when the month averaged 19.9°C — while the coldest was 2012 at 15.3°C. Typical December days reach 25.3°C with nights near 10.8°C. The long-term trend is cooling, about 0.2°C per decade.
December is one of the drier months in Samastipur, averaging 5 mm of rainfall. The wettest December on record was 1995 with 33 mm, while the driest were 2022, 2024 and 2025, among others at 0 mm.
Relative humidity in Samastipur during December averages 54%. The most humid December was 2021 at 78%, and the least humid was 1992 at 36%.
December receives about 3.4 kWh/m²/day of solar energy in Samastipur. The sunniest December was 1985 at 4.3 kWh/m²/day, and the cloudiest were 2015, 2016 and 2019, among others at 2.7.
Average wind speed in Samastipur during December is 1.4 m/s. The windiest December was 2012 at 2.1 m/s, while the calmest were 2003, 2004 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 | 18.2°C | 18.5°C | 17.9°C | 17.6°C | 17.8°C | -0.4°C |
| Avg High | 25.7°C | 26.1°C | 25.0°C | 24.8°C | 24.6°C | -1.1°C |
| Avg Low | 10.7°C | 10.8°C | 10.9°C | 10.4°C | 11.0°C | +0.3°C |
| Avg Rain | 10 mm | 8 mm | 3 mm | 3 mm | 2 mm | -8 mm |
December temperatures in Samastipur have stayed relatively stable across the record.
December has ranged from a record low of 2.5°C (2019) to a record high of 31.4°C (2015).
Rainfall in December is one of the drier months, averaging 5 mm, with a wettest year of 33 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 Samastipur
December is one of the best times to visit Samastipur. Expect days averaging 25.3°C and nights around 10.8°C (mean 18.1°C) — cooler than Samastipur's yearly average — with low rainfall (5 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 | 16.1°C | 9.2°C | 25.4°C | 6.8°C | 0 mm | 75% | 1.4 m/s | — |
| 2024 | 26.0°C | 19.0°C | 12.0°C | 28.6°C | 6.5°C | 0 mm | 60% | 1.3 m/s | 3.2 |
| 2023 | 25.9°C | 19.4°C | 12.9°C | 30.7°C | 8.8°C | 6 mm | 63% | 1.3 m/s | 2.9 |
| 2022 | 25.2°C | 17.9°C | 10.6°C | 27.7°C | 7.7°C | 0 mm | 65% | 1.6 m/s | 3.1 |
| 2021 | 23.3°C | 17.3°C | 11.2°C | 27.4°C | 4.8°C | 8 mm | 78% | 1.6 m/s | 3.3 |
| 2020 | 24.1°C | 17.2°C | 10.3°C | 26.8°C | 4.9°C | 1 mm | 63% | 1.4 m/s | 2.9 |
| 2019 | 22.7°C | 16.2°C | 9.7°C | 26.8°C | 2.5°C | 21 mm | 71% | 1.7 m/s | 2.7 |
| 2018 | 25.5°C | 18.3°C | 11.1°C | 28.4°C | 5.0°C | 4 mm | 47% | 1.5 m/s | 3.1 |
| 2017 🔥 | 27.1°C | 19.9°C | 12.7°C | 30.5°C | 8.4°C | 0 mm | 50% | 1.4 m/s | 3.3 |
| 2016 | 25.8°C | 18.1°C | 10.4°C | 28.5°C | 7.1°C | 0 mm | 61% | 1.6 m/s | 2.7 |
| 2015 | 26.2°C | 19.1°C | 12.0°C | 31.4°C | 6.6°C | 0 mm | 45% | 1.3 m/s | 2.7 |
| 2014 | 23.7°C | 16.1°C | 8.5°C | 27.6°C | 4.6°C | 3 mm | 59% | 1.6 m/s | 2.7 |
| 2013 | 24.7°C | 17.7°C | 10.7°C | 27.0°C | 7.0°C | 0 mm | 65% | 1.4 m/s | 3.1 |
| 2012 ❄️ | 22.8°C | 15.3°C | 7.7°C | 26.0°C | 3.6°C | 0 mm | 59% | 2.1 m/s | 3 |
| 2011 | 24.6°C | 17.8°C | 10.9°C | 28.5°C | 6.3°C | 0 mm | 58% | 1.1 m/s | 2.8 |
| 2010 | 24.7°C | 17.7°C | 10.6°C | 28.4°C | 6.2°C | 1 mm | 56% | 1.3 m/s | 3.4 |
| 2009 | 24.9°C | 17.9°C | 10.9°C | 27.9°C | 5.9°C | 4 mm | 53% | 1.4 m/s | 3.2 |
| 2008 | 25.0°C | 18.8°C | 12.5°C | 27.8°C | 8.8°C | 0 mm | 71% | 1.2 m/s | 2.7 |
| 2007 | 22.8°C | 15.7°C | 8.7°C | 25.5°C | 4.6°C | 0 mm | 67% | 1.4 m/s | 3.5 |
| 2006 | 25.4°C | 18.4°C | 11.4°C | 28.0°C | 7.5°C | 4 mm | 55% | 1.2 m/s | 3.5 |
| 2005 | 25.5°C | 18.0°C | 10.4°C | 27.8°C | 6.7°C | 0 mm | 53% | 1.3 m/s | 3.8 |
| 2004 | 25.4°C | 18.8°C | 12.3°C | 27.9°C | 6.0°C | 0 mm | 55% | 1.1 m/s | 3.2 |
| 2003 | 24.9°C | 18.0°C | 11.1°C | 28.3°C | 7.4°C | 8 mm | 57% | 1.1 m/s | 3.5 |
| 2002 | 25.8°C | 18.5°C | 11.2°C | 28.5°C | 8.6°C | 8 mm | 45% | 1.2 m/s | 3.3 |
| 2001 | 24.6°C | 17.3°C | 10.0°C | 25.8°C | 7.2°C | 0 mm | 55% | 1.1 m/s | 3.1 |
| 2000 | 25.4°C | 17.8°C | 10.2°C | 26.8°C | 7.9°C | 0 mm | 44% | 1.2 m/s | 4 |
| 1999 | 27.2°C | 19.3°C | 11.4°C | 29.3°C | 7.8°C | 0 mm | 44% | 1.2 m/s | 3.8 |
| 1998 | 26.1°C | 18.3°C | 10.5°C | 28.7°C | 7.2°C | 0 mm | 51% | 1.2 m/s | 3.7 |
| 1997 | 23.5°C | 17.1°C | 10.8°C | 28.7°C | 5.9°C | 32 mm | 65% | 1.6 m/s | 2.8 |
| 1996 | 26.1°C | 17.6°C | 9.1°C | 28.0°C | 5.0°C | 0 mm | 41% | 1.4 m/s | 4 |
| 1995 🌧️ | 25.8°C | 18.3°C | 10.7°C | 28.0°C | 7.7°C | 33 mm | 50% | 1.4 m/s | 3.7 |
| 1994 | 26.8°C | 18.5°C | 10.3°C | 29.8°C | 5.3°C | 0 mm | 37% | 1.5 m/s | 4.1 |
| 1993 | 26.0°C | 18.2°C | 10.5°C | 28.0°C | 6.7°C | 0 mm | 42% | 1.3 m/s | 3.7 |
| 1992 | 26.8°C | 19.3°C | 11.8°C | 28.9°C | 8.8°C | 2 mm | 36% | 1.2 m/s | 4 |
| 1991 | 26.1°C | 18.8°C | 11.5°C | 28.5°C | 6.6°C | 15 mm | 46% | 1.4 m/s | 3.7 |
| 1990 | 26.8°C | 19.1°C | 11.4°C | 28.8°C | 7.0°C | 0 mm | 43% | 1.3 m/s | 4.1 |
| 1989 | 25.7°C | 18.1°C | 10.5°C | 29.9°C | 6.5°C | 10 mm | 40% | 1.2 m/s | 3.9 |
| 1988 | 26.8°C | 19.5°C | 12.2°C | 29.6°C | 8.5°C | 26 mm | 44% | 1.3 m/s | 4.2 |
| 1987 | 24.9°C | 17.6°C | 10.2°C | 27.3°C | 7.2°C | 2 mm | 60% | 1.2 m/s | 3.8 |
| 1986 | 25.8°C | 18.8°C | 11.8°C | 28.4°C | 8.4°C | 22 mm | 50% | 1.4 m/s | 3.6 |
| 1985 | 23.9°C | 17.3°C | 10.6°C | 26.5°C | 6.8°C | 6 mm | 69% | 1.5 m/s | 4.3 |
| 1984 | 26.4°C | 18.0°C | 9.6°C | 29.2°C | 4.4°C | 1 mm | 42% | 1.4 m/s | 4 |
| 1983 | 26.1°C | 18.5°C | 11.0°C | 29.1°C | 6.7°C | 6 mm | 40% | 1.5 m/s | — |
| 1982 | 26.1°C | 18.3°C | 10.4°C | 28.2°C | 7.3°C | 3 mm | 44% | 1.6 m/s | — |
| 1981 | 25.3°C | 17.8°C | 10.3°C | 27.7°C | 6.8°C | 15 mm | 56% | 1.5 m/s | — |
Actual recorded December data for each year, 1981–2025 — sourced from NASA POWER.
The average high in December is around 25.3°C with lows near 10.8°C (mean 18.1°C), based on 45 years of NASA POWER data.
December averages 5 mm of rainfall in Samastipur, one of the drier months. The wettest on record was 33 mm in 1995.
The hottest December reached 31.4°C in 2015. The coldest dipped to 2.5°C in 2019.
Comparing the earliest years on record (1981–1985) with the most recent (2021–2025), average December temperatures have fallen by about 0.1°C — but days and nights have moved in opposite directions. Overnight lows rose from 10.4°C to 11.2°C while daytime highs eased from 25.6°C to 24.7°C, narrowing the gap between day and night.
December is one of the cooler months of the year in Samastipur and one of the drier months, so plan for around 25.3°C daytime highs and 10.8°C at night.
Not quite — December is the 2nd coolest month in Samastipur, averaging 18.1°C.
For December in Samastipur, pack light layers you can adjust through the day, with typical highs of 25.3°C and lows of 10.8°C.
Relative humidity in December averages 54% — relatively dry.
Average wind speed in December is 1.4 m/s. The windiest December on record averaged 2.1 m/s (2012).
The wettest December on record was 1995 with 33 mm. On average, December sees 5 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 Samastipur 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.
