December is one of the cooler months of the year in Idukki, with average highs near 27.6°C and lows around 14.2°C (mean 20.9°C). It is one of the drier months, averaging 53 mm of rainfall and 83% relative humidity across the period.
December is one of the cooler months of the year in Idukki. Across 45 years of records, the warmest December in Idukki was 2016 — when the month averaged 22.9°C — while the coldest was 2007 at 19.4°C. Typical December days reach 27.6°C with nights near 14.2°C. The long-term December temperature trend is broadly flat.
Ranked against the other 11 months using 1981–2025 averages.
| Metric | 1980s | 1990s | 2000s | 2010s | 2020s | Change |
|---|---|---|---|---|---|---|
| Avg Temp | 21.3°C | 20.6°C | 20.2°C | 21.2°C | 21.3°C | 0°C |
| Avg High | 28.1°C | 27.3°C | 27.4°C | 27.7°C | 27.5°C | -0.6°C |
| Avg Low | 14.4°C | 13.8°C | 13.1°C | 14.8°C | 15.2°C | +0.8°C |
| Avg Rain | 51 mm | 60 mm | 26 mm | 45 mm | 105 mm | +55 mm |
December temperatures in Idukki have stayed relatively stable across the record.
December has ranged from a record low of 11.5°C (2008) to a record high of 30.6°C (2016).
Rainfall in December is one of the drier months, averaging 53 mm, with a wettest year of 178 mm.
Daytime highs and overnight lows have shifted differently — highs fell about 0.1°C per decade while lows rose 0.3°C per decade, narrowing the gap between day and night.
One of the best times to visit Idukki
December is one of the best times to visit Idukki. Expect days averaging 27.6°C and nights around 14.2°C (mean 20.9°C) — cooler than Idukki's yearly average — with moderate rainfall (53 mm), so conditions are generally comfortable for sightseeing and outdoor plans.
| Year | High | Low | Avg | Rainfall | Humidity | Wind | Solar |
|---|---|---|---|---|---|---|---|
| 2025 | 26.9°C | 13.1°C | 20.0°C | 33 mm | 84% | 0.3 m/s | — |
| 2024 | 27.9°C | 16.6°C | 22.2°C | 161 mm | 88% | 0.3 m/s | 4.3 |
| 2023 | 27.9°C | 17.3°C | 22.6°C | 132 mm | 88% | 0.3 m/s | 4 |
| 2022 | 27.2°C | 15.8°C | 21.5°C | 121 mm | 86% | 0.3 m/s | 4.2 |
| 2021 | 27.8°C | 13.6°C | 20.7°C | 87 mm | 86% | 0.3 m/s | 4.9 |
| 2020 | 27.2°C | 14.8°C | 21.0°C | 98 mm | 87% | 0.3 m/s | 3.8 |
| 2019 | 27.7°C | 17.5°C | 22.6°C | 46 mm | 87% | 0.3 m/s | 4.1 |
| 2018 | 27.3°C | 16.4°C | 21.8°C | 19 mm | 84% | 0.3 m/s | 4.4 |
| 2017 | 27.3°C | 14.6°C | 20.9°C | 40 mm | 85% | 0.4 m/s | 4.8 |
| 2016 🔥 | 30.6°C | 15.2°C | 22.9°C | 36 mm | 76% | 0.4 m/s | 4.7 |
| 2015 | 27.2°C | 14.2°C | 20.7°C | 84 mm | 87% | 0.3 m/s | 4.2 |
| 2014 | 27.3°C | 15.3°C | 21.3°C | 26 mm | 85% | 0.3 m/s | 3.9 |
| 2013 | 27.1°C | 13.9°C | 20.5°C | 47 mm | 82% | 0.3 m/s | 4.5 |
| 2012 | 29.1°C | 14.8°C | 22.0°C | 13 mm | 78% | 0.3 m/s | 4.4 |
| 2011 | 27.4°C | 12.6°C | 20.0°C | 75 mm | 83% | 0.3 m/s | 4.5 |
| 2010 | 25.9°C | 13.6°C | 19.7°C | 69 mm | 88% | 0.3 m/s | 4.2 |
| 2009 | 27.4°C | 15.4°C | 21.4°C | 15 mm | 85% | 0.3 m/s | 4.2 |
| 2008 | 27.6°C | 11.5°C | 19.5°C | 20 mm | 82% | 0.3 m/s | 4.6 |
| 2007 ❄️ | 26.5°C | 12.4°C | 19.4°C | 49 mm | 84% | 0.4 m/s | 4.4 |
| 2006 | 27.2°C | 12.7°C | 20.0°C | 2 mm | 83% | 0.4 m/s | 4.9 |
| 2005 | 27.3°C | 13.8°C | 20.5°C | 53 mm | 87% | 0.3 m/s | 4.6 |
| 2004 | 27.3°C | 12.9°C | 20.1°C | 4 mm | 83% | 0.3 m/s | 4.7 |
| 2003 | 27.7°C | 12.9°C | 20.3°C | 70 mm | 81% | 0.3 m/s | 5.1 |
| 2002 | 27.2°C | 13.5°C | 20.3°C | 2 mm | 81% | 0.3 m/s | 4.6 |
| 2001 | 26.9°C | 13.2°C | 20.1°C | 15 mm | 84% | 0.3 m/s | 4.5 |
| 2000 | 28.7°C | 12.7°C | 20.7°C | 35 mm | 78% | 0.3 m/s | 5 |
| 1999 | 26.9°C | 13.5°C | 20.2°C | 33 mm | 83% | 0.3 m/s | 4.9 |
| 1998 | 27.2°C | 12.6°C | 19.9°C | 102 mm | 86% | 0.3 m/s | 3.9 |
| 1997 | 27.9°C | 17.1°C | 22.5°C | 131 mm | 88% | 0.3 m/s | 4.2 |
| 1996 🌧️ | 26.9°C | 13.4°C | 20.1°C | 178 mm | 86% | 0.3 m/s | 4.5 |
| 1995 | 26.9°C | 13.7°C | 20.3°C | 1 mm | 79% | 0.3 m/s | 5.4 |
| 1994 | 27.3°C | 12.7°C | 20.0°C | 7 mm | 81% | 0.3 m/s | 5.2 |
| 1993 | 26.9°C | 14.6°C | 20.7°C | 111 mm | 86% | 0.3 m/s | 4 |
| 1992 | 26.9°C | 13.1°C | 20.0°C | 15 mm | 83% | 0.3 m/s | 4.8 |
| 1991 | 27.1°C | 12.3°C | 19.7°C | 18 mm | 83% | 0.3 m/s | 4.7 |
| 1990 | 29.4°C | 14.9°C | 22.2°C | 5 mm | 80% | 0.3 m/s | 4.7 |
| 1989 | 27.6°C | 14.6°C | 21.1°C | 23 mm | 81% | 0.3 m/s | 5.1 |
| 1988 | 28.4°C | 13.8°C | 21.1°C | 55 mm | 78% | 0.3 m/s | 5.1 |
| 1987 | 26.7°C | 14.7°C | 20.7°C | 127 mm | 88% | 0.3 m/s | 4.5 |
| 1986 | 29.9°C | 15.3°C | 22.6°C | 12 mm | 77% | 0.3 m/s | 4.7 |
| 1985 | 28.1°C | 13.7°C | 20.9°C | 70 mm | 81% | 0.3 m/s | 4.9 |
| 1984 | 28.4°C | 12.0°C | 20.2°C | 29 mm | 77% | 0.4 m/s | 5 |
| 1983 | 28.4°C | 16.6°C | 22.5°C | 112 mm | 85% | 0.3 m/s | — |
| 1982 | 29.0°C | 15.1°C | 22.0°C | 9 mm | 76% | 0.3 m/s | — |
| 1981 | 26.6°C | 13.8°C | 20.2°C | 19 mm | 85% | 0.3 m/s | — |
Actual recorded December data for each year, 1981–2025 — sourced from NASA POWER.
The average high in December is around 27.6°C with lows near 14.2°C (mean 20.9°C), based on 45 years of NASA POWER data.
December averages 53 mm of rainfall in Idukki, one of the drier months. The wettest on record was 178 mm in 1996.
The hottest December reached 30.6°C in 2016. The coldest dipped to 11.5°C in 2008.
Comparing the earliest years on record (1981–1985) with the most recent (2021–2025), average December temperatures have risen by about 0.2°C. Daytime highs moved from 28.1°C to 27.5°C and overnight lows from 14.2°C to 15.3°C over the same span.
December is one of the cooler months of the year in Idukki and one of the drier months, so plan for around 27.6°C daytime highs and 14.2°C at night.
Yes — December is the coldest month of the year in Idukki, averaging 20.9°C.
For December in Idukki, pack light layers you can adjust through the day, with typical highs of 27.6°C and lows of 14.2°C. Bring an umbrella or light rain jacket too.
Relative humidity in December averages 83% — quite humid.
Average wind speed in December is 0.3 m/s. The windiest December on record averaged 0.4 m/s (1984).
The wettest December on record was 1996 with 178 mm. On average, December sees 53 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 Idukki 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.
