January is one of the cooler months of the year in Jamui, with average highs near 28.4°C and lows around 5.5°C (mean 17°C). It is one of the drier months, averaging 10 mm of rainfall and 50% relative humidity across the period.
January is one of the cooler months of the year in Jamui. Across 45 years of records, the warmest January in Jamui was 1990 — when the month averaged 19.4°C — while the coldest was 2013 at 14.5°C. Typical January days reach 28.4°C with nights near 5.5°C. The long-term trend is cooling, about 0.3°C per decade.
Ranked against the other 11 months using 1981–2025 averages.
| Metric | 1980s | 1990s | 2000s | 2010s | 2020s | Change |
|---|---|---|---|---|---|---|
| Avg Temp | 17.2°C | 17.3°C | 17.2°C | 16.4°C | 16.5°C | -0.7°C |
| Avg High | 28.6°C | 29.1°C | 28.6°C | 27.7°C | 27.5°C | -1.1°C |
| Avg Low | 5.9°C | 5.5°C | 5.8°C | 5.0°C | 5.5°C | -0.4°C |
| Avg Rain | 12 mm | 9 mm | 12 mm | 9 mm | 3 mm | -9 mm |
January temperatures in Jamui have fallen by about 1.1°C between 1981–1985 and 2021–2025.
January has ranged from a record low of 1.7°C (2013) to a record high of 32.9°C (1990).
Rainfall in January is one of the drier months, averaging 10 mm, with a wettest year of 48 mm.
Daytime highs and overnight lows have shifted differently — highs fell about 0.4°C per decade while lows fell 0.2°C per decade, narrowing the gap between day and night.
A good time to visit Jamui
January is a good time to visit Jamui, with days averaging 28.4°C and nights around 5.5°C (mean 17°C, cooler than Jamui's yearly average) and low rainfall. February and November are marginally more temperate, but January still suits most travellers.
| Year | High | Low | Avg | Rainfall | Humidity | Wind | Solar |
|---|---|---|---|---|---|---|---|
| 2025 | 29.3°C | 6.8°C | 18.0°C | 0 mm | 55% | 1.7 m/s | 3.4 |
| 2024 | 25.0°C | 5.4°C | 15.2°C | 0 mm | 64% | 1.5 m/s | 3 |
| 2023 | 29.6°C | 5.2°C | 17.4°C | 0 mm | 51% | 1.8 m/s | 3.3 |
| 2022 | 25.6°C | 5.6°C | 15.6°C | 8 mm | 75% | 1.8 m/s | 3.2 |
| 2021 | 28.6°C | 5.8°C | 17.2°C | 0 mm | 56% | 1.6 m/s | 3.3 |
| 2020 | 27.1°C | 4.4°C | 15.7°C | 12 mm | 72% | 1.8 m/s | 3.3 |
| 2019 | 29.6°C | 6.2°C | 17.9°C | 6 mm | 45% | 1.6 m/s | 3.7 |
| 2018 | 27.4°C | 4.7°C | 16.1°C | 0 mm | 49% | 1.8 m/s | 3.9 |
| 2017 | 31.0°C | 4.0°C | 17.5°C | 4 mm | 56% | 1.9 m/s | 3.8 |
| 2016 | 29.3°C | 5.7°C | 17.5°C | 20 mm | 42% | 1.6 m/s | 3.3 |
| 2015 | 26.6°C | 5.3°C | 16.0°C | 23 mm | 58% | 2.1 m/s | 3.5 |
| 2014 | 26.3°C | 5.7°C | 16.0°C | 16 mm | 59% | 1.9 m/s | 3.5 |
| 2013 ❄️ | 27.2°C | 1.7°C | 14.5°C | 2 mm | 51% | 2.1 m/s | 3.8 |
| 2012 | 25.8°C | 5.2°C | 15.5°C | 21 mm | 63% | 1.8 m/s | 3.2 |
| 2011 | 27.8°C | 4.6°C | 16.2°C | 3 mm | 48% | 1.8 m/s | 3.7 |
| 2010 | 26.4°C | 6.4°C | 16.4°C | 0 mm | 49% | 1.7 m/s | 3.8 |
| 2009 | 29.5°C | 6.5°C | 18.0°C | 3 mm | 60% | 1.5 m/s | 3.6 |
| 2008 🌧️ | 27.1°C | 5.6°C | 16.4°C | 48 mm | 62% | 1.6 m/s | 3.5 |
| 2007 | 29.2°C | 5.4°C | 17.3°C | 0 mm | 46% | 1.6 m/s | 3.9 |
| 2006 | 29.5°C | 6.2°C | 17.9°C | 0 mm | 40% | 1.9 m/s | 4.2 |
| 2005 | 27.1°C | 7.9°C | 17.5°C | 18 mm | 55% | 1.6 m/s | 3.3 |
| 2004 | 26.5°C | 6.1°C | 16.3°C | 19 mm | 59% | 1.5 m/s | 3.7 |
| 2003 | 28.4°C | 4.2°C | 16.3°C | 6 mm | 46% | 1.6 m/s | 3.9 |
| 2002 | 28.9°C | 5.6°C | 17.3°C | 12 mm | 55% | 1.6 m/s | 3.7 |
| 2001 | 30.6°C | 4.9°C | 17.8°C | 5 mm | 39% | 1.8 m/s | 4 |
| 2000 | 29.2°C | 5.4°C | 17.3°C | 4 mm | 38% | 1.6 m/s | 4.2 |
| 1999 | 29.1°C | 5.8°C | 17.4°C | 0 mm | 50% | 1.7 m/s | 4.5 |
| 1998 | 26.0°C | 4.3°C | 15.1°C | 12 mm | 59% | 1.7 m/s | 3.8 |
| 1997 | 27.4°C | 6.1°C | 16.8°C | 8 mm | 37% | 1.8 m/s | 3.9 |
| 1996 | 27.2°C | 5.7°C | 16.5°C | 18 mm | 56% | 1.9 m/s | 4.1 |
| 1995 | 28.1°C | 5.2°C | 16.6°C | 13 mm | 42% | 1.9 m/s | 3.9 |
| 1994 | 30.0°C | 6.7°C | 18.4°C | 25 mm | 50% | 1.9 m/s | 4.2 |
| 1993 | 29.7°C | 5.5°C | 17.6°C | 5 mm | 34% | 2.2 m/s | 4.2 |
| 1992 | 29.8°C | 4.8°C | 17.3°C | 1 mm | 42% | 1.5 m/s | 4.3 |
| 1991 | 30.5°C | 5.4°C | 18.0°C | 7 mm | 43% | 1.6 m/s | 4.4 |
| 1990 🔥 | 32.9°C | 5.8°C | 19.4°C | 0 mm | 33% | 2 m/s | 4.6 |
| 1989 | 29.3°C | 4.0°C | 16.6°C | 3 mm | 41% | 1.9 m/s | 4.5 |
| 1988 | 27.7°C | 5.7°C | 16.7°C | 2 mm | 52% | 1.7 m/s | 4.6 |
| 1987 | 28.5°C | 5.1°C | 16.8°C | 4 mm | 42% | 1.5 m/s | 4.3 |
| 1986 | 28.4°C | 3.4°C | 15.9°C | 4 mm | 59% | 1.7 m/s | 4.3 |
| 1985 | 28.6°C | 7.5°C | 18.0°C | 8 mm | 49% | 1.6 m/s | 4.4 |
| 1984 | 28.2°C | 7.4°C | 17.8°C | 28 mm | 44% | 1.7 m/s | 4 |
| 1983 | 29.9°C | 6.6°C | 18.2°C | 0 mm | 35% | 1.5 m/s | — |
| 1982 | 29.4°C | 6.7°C | 18.1°C | 22 mm | 53% | 1.7 m/s | — |
| 1981 | 27.1°C | 6.7°C | 16.9°C | 38 mm | 61% | 1.6 m/s | — |
Actual recorded January data for each year, 1981–2025 — sourced from NASA POWER.
The average high in January is around 28.4°C with lows near 5.5°C (mean 17°C), based on 45 years of NASA POWER data.
January averages 10 mm of rainfall in Jamui, one of the drier months. The wettest on record was 48 mm in 2008.
The hottest January reached 32.9°C in 1990. The coldest dipped to 1.7°C in 2013.
Comparing the earliest years on record (1981–1985) with the most recent (2021–2025), average January temperatures have fallen by about 1.1°C. Daytime highs moved from 28.6°C to 27.6°C and overnight lows from 7°C to 5.8°C over the same span.
January is one of the cooler months of the year in Jamui and one of the drier months, so plan for around 28.4°C daytime highs and 5.5°C at night.
Not quite — January is the 2nd coolest month in Jamui, averaging 17°C.
For January in Jamui, pack warm layers and a jacket for chilly mornings, with typical highs of 28.4°C and lows of 5.5°C.
Relative humidity in January averages 50% — relatively dry.
Average wind speed in January is 1.7 m/s. The windiest January on record averaged 2.2 m/s (1993).
The wettest January on record was 2008 with 48 mm. On average, January sees 10 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 Jamui behaves each January, 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 January specifically, along with year-by-year records and how the month has changed over the decades.
