December is one of the cooler months of the year in East Siang, with average highs near 24.5°C and lows around 13°C (mean 18.8°C). It is one of the drier months, averaging 12 mm of rainfall and 65% relative humidity across the period.
December is one of the cooler months of the year in East Siang. Across 45 years of records, the warmest December in East Siang was 2016 — when the month averaged 21°C — while the coldest was 2009 at 16.7°C. Typical December days reach 24.5°C with nights near 13°C. The long-term trend is warming, about 0.3°C per decade.
December is one of the drier months in East Siang, averaging 12 mm of rainfall. The wettest December on record was 1985 with 82 mm, while the driest were 1993, 1996 and 2005 at 0 mm.
Relative humidity in East Siang during December averages 65%. The most humid December was 2009 at 73%, and the least humid was 2000 at 56%.
December receives about 3.3 kWh/m²/day of solar energy in East Siang. The sunniest December was 2005 at 3.9 kWh/m²/day, and the cloudiest was 2009 at 2.7.
Average wind speed in East Siang during December is 0.7 m/s. The windiest December was 2000 at 0.8 m/s, while the calmest were 2021, 2022 and 2023, among others at 0.6 m/s.
Ranked against the other 11 months using 1981–2025 averages.
| Metric | 1980s | 1990s | 2000s | 2010s | 2020s | Change |
|---|---|---|---|---|---|---|
| Avg Temp | 18.5°C | 18.6°C | 18.5°C | 19.2°C | 19.4°C | +0.9°C |
| Avg High | 24.3°C | 24.8°C | 24.4°C | 24.6°C | 24.6°C | +0.3°C |
| Avg Low | 12.5°C | 12.4°C | 12.6°C | 13.8°C | 14.1°C | +1.6°C |
| Avg Rain | 26 mm | 9 mm | 5 mm | 10 mm | 14 mm | -11 mm |
December temperatures in East Siang have risen by about 1.4°C between 1981–1985 and 2021–2025.
December has ranged from a record low of 6°C (1982) to a record high of 32.4°C (1998).
Rainfall in December is one of the drier months, averaging 12 mm, with a wettest year of 82 mm.
Daytime highs and overnight lows have shifted differently — highs rose about 0.1°C per decade while lows rose 0.5°C per decade, narrowing the gap between day and night.
One of the best times to visit East Siang
December is one of the best times to visit East Siang. Expect days averaging 24.5°C and nights around 13°C (mean 18.8°C) — cooler than East Siang's yearly average — with low rainfall (12 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 | 24.9°C | 19.6°C | 14.3°C | 29.3°C | 12.2°C | 5 mm | 65% | 0.7 m/s | — |
| 2024 | 24.1°C | 18.8°C | 13.5°C | 27.2°C | 11.6°C | 2 mm | 64% | 0.7 m/s | 3.4 |
| 2023 | 25.6°C | 20.2°C | 14.8°C | 29.0°C | 12.8°C | 16 mm | 68% | 0.6 m/s | 3.2 |
| 2022 | 24.4°C | 19.2°C | 14.0°C | 28.8°C | 10.4°C | 32 mm | 70% | 0.6 m/s | 2.8 |
| 2021 | 24.7°C | 19.4°C | 14.1°C | 28.9°C | 10.2°C | 16 mm | 68% | 0.6 m/s | 3.2 |
| 2020 | 24.1°C | 19.1°C | 14.0°C | 31.3°C | 12.2°C | 13 mm | 68% | 0.6 m/s | 3.2 |
| 2019 | 23.7°C | 18.5°C | 13.3°C | 29.3°C | 11.3°C | 3 mm | 70% | 0.6 m/s | 3 |
| 2018 | 25.1°C | 19.2°C | 13.3°C | 28.2°C | 11.3°C | 18 mm | 66% | 0.6 m/s | 3.4 |
| 2017 | 25.5°C | 20.6°C | 15.7°C | 31.0°C | 12.7°C | 1 mm | 70% | 0.6 m/s | 3.6 |
| 2016 🔥 | 26.4°C | 21.0°C | 15.6°C | 30.8°C | 13.3°C | 8 mm | 67% | 0.6 m/s | 3.5 |
| 2015 | 23.9°C | 18.6°C | 13.3°C | 27.6°C | 10.3°C | 15 mm | 70% | 0.6 m/s | 2.8 |
| 2014 | 25.9°C | 20.3°C | 14.6°C | 29.5°C | 11.9°C | 2 mm | 69% | 0.6 m/s | 3.1 |
| 2013 | 22.5°C | 17.7°C | 13.0°C | 31.3°C | 8.8°C | 5 mm | 72% | 0.6 m/s | 3 |
| 2012 | 24.0°C | 18.9°C | 13.8°C | 29.8°C | 10.8°C | 15 mm | 72% | 0.6 m/s | 3 |
| 2011 | 24.5°C | 18.7°C | 12.9°C | 28.9°C | 10.3°C | 28 mm | 64% | 0.7 m/s | 3.2 |
| 2010 | 24.5°C | 18.5°C | 12.5°C | 30.5°C | 8.2°C | 5 mm | 61% | 0.7 m/s | 3.7 |
| 2009 ❄️ | 21.3°C | 16.7°C | 12.1°C | 26.0°C | 9.0°C | 8 mm | 73% | 0.6 m/s | 2.7 |
| 2008 | 24.3°C | 19.1°C | 13.8°C | 29.5°C | 11.3°C | 2 mm | 70% | 0.6 m/s | 3.2 |
| 2007 | 24.5°C | 18.3°C | 12.1°C | 28.9°C | 10.2°C | 4 mm | 61% | 0.7 m/s | 3.4 |
| 2006 | 24.7°C | 18.7°C | 12.7°C | 31.0°C | 10.8°C | 11 mm | 66% | 0.7 m/s | 3.2 |
| 2005 | 24.9°C | 19.0°C | 13.2°C | 28.8°C | 11.0°C | 0 mm | 57% | 0.7 m/s | 3.9 |
| 2004 | 23.9°C | 18.1°C | 12.4°C | 28.2°C | 9.0°C | 14 mm | 65% | 0.7 m/s | 3.3 |
| 2003 | 25.3°C | 19.1°C | 13.0°C | 29.5°C | 9.1°C | 3 mm | 63% | 0.7 m/s | 3.3 |
| 2002 | 23.8°C | 18.3°C | 12.8°C | 29.5°C | 9.4°C | 2 mm | 64% | 0.7 m/s | 3.3 |
| 2001 | 25.7°C | 19.0°C | 12.3°C | 29.2°C | 9.1°C | 5 mm | 58% | 0.7 m/s | 3.4 |
| 2000 | 25.7°C | 18.9°C | 12.1°C | 29.0°C | 9.9°C | 1 mm | 56% | 0.8 m/s | 3.6 |
| 1999 | 25.3°C | 19.2°C | 13.0°C | 30.8°C | 10.1°C | 1 mm | 62% | 0.7 m/s | 3.6 |
| 1998 | 26.3°C | 19.6°C | 12.8°C | 32.4°C | 10.0°C | 4 mm | 57% | 0.7 m/s | 3.7 |
| 1997 | 23.5°C | 17.8°C | 12.1°C | 27.2°C | 8.6°C | 24 mm | 65% | 0.7 m/s | 3.1 |
| 1996 | 26.0°C | 19.2°C | 12.4°C | 29.4°C | 9.5°C | 0 mm | 58% | 0.7 m/s | 3.8 |
| 1995 | 23.9°C | 18.1°C | 12.3°C | 27.3°C | 10.2°C | 18 mm | 67% | 0.7 m/s | 2.9 |
| 1994 | 25.3°C | 18.4°C | 11.4°C | 29.7°C | 9.8°C | 0 mm | 58% | 0.7 m/s | 3.5 |
| 1993 | 26.1°C | 19.8°C | 13.5°C | 29.0°C | 11.2°C | 0 mm | 61% | 0.7 m/s | 3.4 |
| 1992 | 23.0°C | 17.1°C | 11.3°C | 27.4°C | 9.4°C | 3 mm | 62% | 0.7 m/s | 3.7 |
| 1991 | 23.3°C | 17.7°C | 12.1°C | 30.1°C | 8.5°C | 42 mm | 66% | 0.7 m/s | 3.3 |
| 1990 | 25.0°C | 19.2°C | 13.3°C | 28.4°C | 11.8°C | 1 mm | 65% | 0.7 m/s | 3.4 |
| 1989 | 23.5°C | 17.4°C | 11.4°C | 29.9°C | 8.5°C | 17 mm | 64% | 0.7 m/s | 3.6 |
| 1988 | 25.5°C | 20.0°C | 14.4°C | 29.5°C | 12.0°C | 10 mm | 66% | 0.7 m/s | 3.5 |
| 1987 | 26.4°C | 20.2°C | 13.9°C | 30.3°C | 11.4°C | 17 mm | 63% | 0.7 m/s | 3.7 |
| 1986 | 25.4°C | 18.8°C | 12.2°C | 30.0°C | 9.7°C | 15 mm | 61% | 0.7 m/s | 3.3 |
| 1985 🌧️ | 24.3°C | 18.5°C | 12.6°C | 29.2°C | 10.4°C | 82 mm | 68% | 0.7 m/s | 3.3 |
| 1984 | 24.2°C | 18.1°C | 12.0°C | 28.3°C | 9.6°C | 32 mm | 62% | 0.7 m/s | 3.2 |
| 1983 | 23.2°C | 17.6°C | 11.9°C | 26.7°C | 7.8°C | 33 mm | 63% | 0.7 m/s | — |
| 1982 | 22.6°C | 17.1°C | 11.6°C | 25.2°C | 6.0°C | 9 mm | 67% | 0.6 m/s | — |
| 1981 | 24.0°C | 18.5°C | 12.9°C | 29.4°C | 10.2°C | 16 mm | 67% | 0.7 m/s | — |
Actual recorded December data for each year, 1981–2025 — sourced from NASA POWER.
The average high in December is around 24.5°C with lows near 13°C (mean 18.8°C), based on 45 years of NASA POWER data.
December averages 12 mm of rainfall in East Siang, one of the drier months. The wettest on record was 82 mm in 1985.
The hottest December reached 32.4°C in 1998. The coldest dipped to 6°C in 1982.
Comparing the earliest years on record (1981–1985) with the most recent (2021–2025), average December temperatures have risen by about 1.4°C. Daytime highs moved from 23.7°C to 24.7°C and overnight lows from 12.2°C to 14.1°C over the same span.
December is one of the cooler months of the year in East Siang and one of the drier months, so plan for around 24.5°C daytime highs and 13°C at night.
Not quite — December is the 3rd coolest month in East Siang, averaging 18.8°C.
For December in East Siang, pack light layers you can adjust through the day, with typical highs of 24.5°C and lows of 13°C.
Relative humidity in December averages 65% — moderately humid.
Average wind speed in December is 0.7 m/s. The windiest December on record averaged 0.8 m/s (2000).
The wettest December on record was 1985 with 82 mm. On average, December sees 12 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 East Siang 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.
