January is one of the cooler months of the year in West Siang, with average highs near 22.8°C and lows around 4.7°C (mean 13.8°C). It is one of the drier months, averaging 19 mm of rainfall and 71% relative humidity across the period.
January is one of the cooler months of the year in West Siang. Across 45 years of records, the warmest January in West Siang was 2015 — when the month averaged 17°C — while the coldest was 1989 at 12°C. Typical January days reach 22.8°C with nights near 4.7°C. The long-term trend is warming, 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 | 13.3°C | 13.2°C | 13.9°C | 14.5°C | 14.1°C | +0.8°C |
| Avg High | 22.3°C | 22.6°C | 23.1°C | 23.5°C | 22.4°C | +0.1°C |
| Avg Low | 4.3°C | 3.8°C | 4.7°C | 5.4°C | 5.9°C | +1.6°C |
| Avg Rain | 14 mm | 22 mm | 24 mm | 12 mm | 25 mm | +11 mm |
January temperatures in West Siang have risen by about 1.1°C between 1981–1985 and 2021–2025.
January has ranged from a record low of 2.8°C (1983) to a record high of 26.7°C (2013).
Rainfall in January is one of the drier months, averaging 19 mm, with a wettest year of 54 mm.
Daytime highs and overnight lows have shifted differently — highs rose about 0.2°C per decade while lows rose 0.5°C per decade, narrowing the gap between day and night.
A good time to visit West Siang
January is a good time to visit West Siang, with days averaging 22.8°C and nights around 4.7°C (mean 13.8°C, cooler than West Siang's yearly average) and low rainfall. October and November are marginally more temperate, but January still suits most travellers.
| Year | High | Low | Avg | Rainfall | Humidity | Wind | Solar |
|---|---|---|---|---|---|---|---|
| 2025 | 22.1°C | 7.0°C | 14.6°C | 36 mm | 76% | 0.5 m/s | 2.9 |
| 2024 | 22.2°C | 5.5°C | 13.8°C | 8 mm | 71% | 0.5 m/s | 3.1 |
| 2023 | 25.2°C | 5.6°C | 15.4°C | 6 mm | 73% | 0.5 m/s | 2.8 |
| 2022 | 21.3°C | 4.4°C | 12.8°C | 37 mm | 76% | 0.4 m/s | 2.8 |
| 2021 | 22.6°C | 6.8°C | 14.7°C | 18 mm | 79% | 0.4 m/s | 2.7 |
| 2020 | 21.2°C | 5.8°C | 13.5°C | 45 mm | 79% | 0.4 m/s | 2.7 |
| 2019 | 22.8°C | 4.6°C | 13.7°C | 16 mm | 69% | 0.5 m/s | 3.4 |
| 2018 | 22.6°C | 4.6°C | 13.6°C | 19 mm | 78% | 0.4 m/s | 2.8 |
| 2017 | 25.6°C | 6.3°C | 15.9°C | 4 mm | 68% | 0.5 m/s | 3.4 |
| 2016 | 22.0°C | 7.0°C | 14.5°C | 25 mm | 78% | 0.4 m/s | 3 |
| 2015 🔥 | 26.5°C | 7.4°C | 17.0°C | 8 mm | 74% | 0.4 m/s | 3.3 |
| 2014 | 23.2°C | 5.9°C | 14.5°C | 3 mm | 76% | 0.4 m/s | 3.2 |
| 2013 | 26.7°C | 4.0°C | 15.4°C | 6 mm | 73% | 0.5 m/s | 3.1 |
| 2012 | 21.3°C | 4.7°C | 13.0°C | 17 mm | 76% | 0.4 m/s | 2.2 |
| 2011 | 20.4°C | 4.2°C | 12.3°C | 16 mm | 76% | 0.5 m/s | 2.5 |
| 2010 | 24.3°C | 5.5°C | 14.9°C | 0 mm | 65% | 0.6 m/s | 3.6 |
| 2009 | 21.6°C | 5.3°C | 13.5°C | 38 mm | 76% | 0.5 m/s | 2.7 |
| 2008 | 22.9°C | 4.7°C | 13.8°C | 47 mm | 76% | 0.4 m/s | 2.3 |
| 2007 | 25.1°C | 4.0°C | 14.6°C | 4 mm | 68% | 0.5 m/s | 2.8 |
| 2006 | 22.9°C | 4.4°C | 13.7°C | 2 mm | 65% | 0.6 m/s | 3.2 |
| 2005 | 23.2°C | 4.5°C | 13.9°C | 32 mm | 72% | 0.5 m/s | 2.7 |
| 2004 | 21.9°C | 4.9°C | 13.4°C | 7 mm | 69% | 0.5 m/s | 2.9 |
| 2003 | 22.5°C | 5.2°C | 13.9°C | 24 mm | 68% | 0.5 m/s | 3.1 |
| 2002 | 24.7°C | 4.2°C | 14.5°C | 38 mm | 70% | 0.4 m/s | 2.9 |
| 2001 | 23.3°C | 4.5°C | 13.9°C | 11 mm | 65% | 0.5 m/s | 2.7 |
| 2000 | 22.7°C | 4.9°C | 13.8°C | 40 mm | 65% | 0.5 m/s | 2.7 |
| 1999 | 23.8°C | 3.7°C | 13.7°C | 3 mm | 56% | 0.6 m/s | 3.3 |
| 1998 | 22.8°C | 3.4°C | 13.1°C | 15 mm | 67% | 0.5 m/s | 2.6 |
| 1997 | 21.8°C | 3.7°C | 12.7°C | 16 mm | 65% | 0.5 m/s | 2.8 |
| 1996 | 21.2°C | 4.1°C | 12.6°C | 32 mm | 74% | 0.5 m/s | 2.5 |
| 1995 | 22.9°C | 3.1°C | 13.0°C | 20 mm | 64% | 0.5 m/s | 2.7 |
| 1994 | 24.2°C | 4.3°C | 14.3°C | 27 mm | 67% | 0.6 m/s | 2.9 |
| 1993 🌧️ | 21.2°C | 3.9°C | 12.5°C | 54 mm | 76% | 0.5 m/s | 2.5 |
| 1992 | 21.8°C | 3.4°C | 12.6°C | 31 mm | 69% | 0.6 m/s | 3.1 |
| 1991 | 23.7°C | 3.4°C | 13.5°C | 1 mm | 69% | 0.5 m/s | 2.7 |
| 1990 | 23.0°C | 5.0°C | 14.0°C | 26 mm | 73% | 0.5 m/s | 3 |
| 1989 ❄️ | 20.6°C | 3.3°C | 12.0°C | 17 mm | 71% | 0.5 m/s | 2.7 |
| 1988 | 22.1°C | 5.0°C | 13.5°C | 11 mm | 68% | 0.6 m/s | 2.6 |
| 1987 | 23.4°C | 4.6°C | 14.0°C | 1 mm | 66% | 0.6 m/s | 3.3 |
| 1986 | 23.5°C | 4.3°C | 13.9°C | 10 mm | 70% | 0.6 m/s | 2.9 |
| 1985 | 21.4°C | 4.7°C | 13.1°C | 7 mm | 71% | 0.5 m/s | 2.7 |
| 1984 | 21.1°C | 3.5°C | 12.3°C | 13 mm | 72% | 0.5 m/s | 2.7 |
| 1983 | 22.0°C | 2.8°C | 12.4°C | 12 mm | 69% | 0.5 m/s | — |
| 1982 | 23.7°C | 6.1°C | 14.9°C | 20 mm | 72% | 0.6 m/s | — |
| 1981 | 22.6°C | 4.5°C | 13.5°C | 32 mm | 74% | 0.5 m/s | — |
Actual recorded January data for each year, 1981–2025 — sourced from NASA POWER.
The average high in January is around 22.8°C with lows near 4.7°C (mean 13.8°C), based on 45 years of NASA POWER data.
January averages 19 mm of rainfall in West Siang, one of the drier months. The wettest on record was 54 mm in 1993.
The hottest January reached 26.7°C in 2013. The coldest dipped to 2.8°C in 1983.
Comparing the earliest years on record (1981–1985) with the most recent (2021–2025), average January temperatures have risen by about 1.1°C. Daytime highs moved from 22.2°C to 22.7°C and overnight lows from 4.3°C to 5.9°C over the same span.
January is one of the cooler months of the year in West Siang and one of the drier months, so plan for around 22.8°C daytime highs and 4.7°C at night.
Yes — January is the coldest month of the year in West Siang, averaging 13.8°C.
For January in West Siang, pack warm layers and a jacket for chilly mornings, with typical highs of 22.8°C and lows of 4.7°C.
Relative humidity in January averages 71% — moderately humid.
Average wind speed in January is 0.5 m/s. The windiest January on record averaged 0.6 m/s (1982).
The wettest January on record was 1993 with 54 mm. On average, January sees 19 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 West Siang 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.
