December is one of the cooler months of the year in Idukki, with average highs near 25.9°C and lows around 17.4°C (mean 21.7°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 1986 — when the month averaged 23.1°C — while the coldest was 1995 at 20.3°C. Typical December days reach 25.9°C with nights near 17.4°C. The long-term December temperature trend is broadly flat.
December is one of the drier months in Idukki, averaging 53 mm of rainfall. The wettest December on record was 1996 with 178 mm, while the driest was 1995 at 1 mm.
Relative humidity in Idukki during December averages 83%. The most humid December was 2023 at 88%, and the least humid was 2016 at 76%.
December receives about 4.6 kWh/m²/day of solar energy in Idukki. The sunniest December was 1995 at 5.4 kWh/m²/day, and the cloudiest was 2020 at 3.8.
Average wind speed in Idukki during December is 0.3 m/s. The windiest Decembers were 2007, 2016 and 2017, among others at 0.4 m/s, while the calmest were 2023, 2024 and 2025, among others at 0.3 m/s.
Ranked against the other 11 months using 1981–2025 averages.
| Metric | 1980s | 1990s | 2000s | 2010s | 2020s | Change |
|---|---|---|---|---|---|---|
| Avg Temp | 21.8°C | 21.3°C | 21.3°C | 22.0°C | 22.1°C | +0.3°C |
| Avg High | 26.3°C | 25.5°C | 25.7°C | 26.2°C | 25.9°C | -0.4°C |
| Avg Low | 17.4°C | 17.1°C | 16.9°C | 17.9°C | 18.3°C | +0.9°C |
| Avg Rain | 51 mm | 60 mm | 26 mm | 45 mm | 105 mm | +55 mm |
December temperatures in Idukki have risen by about 0.4°C between 1981–1985 and 2021–2025.
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 rose about 0°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 25.9°C and nights around 17.4°C (mean 21.7°C) — cooler than Idukki's yearly average — with moderate rainfall (53 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 | 25.6°C | 21.2°C | 16.7°C | 26.9°C | 13.1°C | 33 mm | 84% | 0.3 m/s | — |
| 2024 | 26.4°C | 22.8°C | 19.3°C | 27.9°C | 16.6°C | 161 mm | 88% | 0.3 m/s | 4.3 |
| 2023 | 26.1°C | 22.9°C | 19.6°C | 27.9°C | 17.3°C | 132 mm | 88% | 0.3 m/s | 4 |
| 2022 | 25.7°C | 21.9°C | 18.2°C | 27.2°C | 15.8°C | 121 mm | 86% | 0.3 m/s | 4.2 |
| 2021 | 25.9°C | 21.9°C | 18.0°C | 27.8°C | 13.6°C | 87 mm | 86% | 0.3 m/s | 4.9 |
| 2020 | 25.6°C | 21.8°C | 18.1°C | 27.2°C | 14.8°C | 98 mm | 87% | 0.3 m/s | 3.8 |
| 2019 | 26.3°C | 22.6°C | 19.0°C | 27.7°C | 17.5°C | 46 mm | 87% | 0.3 m/s | 4.1 |
| 2018 | 26.4°C | 22.2°C | 18.1°C | 27.3°C | 16.4°C | 19 mm | 84% | 0.3 m/s | 4.4 |
| 2017 | 25.6°C | 21.6°C | 17.6°C | 27.3°C | 14.6°C | 40 mm | 85% | 0.4 m/s | 4.8 |
| 2016 | 28.2°C | 22.9°C | 17.5°C | 30.6°C | 15.2°C | 36 mm | 76% | 0.4 m/s | 4.7 |
| 2015 | 25.9°C | 22.3°C | 18.6°C | 27.2°C | 14.2°C | 84 mm | 87% | 0.3 m/s | 4.2 |
| 2014 | 25.9°C | 22.1°C | 18.4°C | 27.3°C | 15.3°C | 26 mm | 85% | 0.3 m/s | 3.9 |
| 2013 | 25.8°C | 21.4°C | 17.0°C | 27.1°C | 13.9°C | 47 mm | 82% | 0.3 m/s | 4.5 |
| 2012 | 27.4°C | 22.7°C | 18.0°C | 29.1°C | 14.8°C | 13 mm | 78% | 0.3 m/s | 4.4 |
| 2011 | 25.7°C | 21.4°C | 17.2°C | 27.4°C | 12.6°C | 75 mm | 83% | 0.3 m/s | 4.5 |
| 2010 | 24.6°C | 21.2°C | 17.7°C | 25.9°C | 13.6°C | 69 mm | 88% | 0.3 m/s | 4.2 |
| 2009 | 26.4°C | 22.4°C | 18.4°C | 27.4°C | 15.4°C | 15 mm | 85% | 0.3 m/s | 4.2 |
| 2008 | 25.7°C | 21.2°C | 16.7°C | 27.6°C | 11.5°C | 20 mm | 82% | 0.3 m/s | 4.6 |
| 2007 | 25.1°C | 21.0°C | 16.9°C | 26.5°C | 12.4°C | 49 mm | 84% | 0.4 m/s | 4.4 |
| 2006 | 25.4°C | 21.0°C | 16.6°C | 27.2°C | 12.7°C | 2 mm | 83% | 0.4 m/s | 4.9 |
| 2005 | 25.5°C | 21.7°C | 18.0°C | 27.3°C | 13.8°C | 53 mm | 87% | 0.3 m/s | 4.6 |
| 2004 | 25.5°C | 20.9°C | 16.2°C | 27.3°C | 12.9°C | 4 mm | 83% | 0.3 m/s | 4.7 |
| 2003 | 25.9°C | 21.2°C | 16.5°C | 27.7°C | 12.9°C | 70 mm | 81% | 0.3 m/s | 5.1 |
| 2002 | 25.7°C | 21.1°C | 16.4°C | 27.2°C | 13.5°C | 2 mm | 81% | 0.3 m/s | 4.6 |
| 2001 | 25.3°C | 21.2°C | 17.0°C | 26.9°C | 13.2°C | 15 mm | 84% | 0.3 m/s | 4.5 |
| 2000 | 26.2°C | 21.1°C | 16.1°C | 28.7°C | 12.7°C | 35 mm | 78% | 0.3 m/s | 5 |
| 1999 | 25.4°C | 21.0°C | 16.6°C | 26.9°C | 13.5°C | 33 mm | 83% | 0.3 m/s | 4.9 |
| 1998 | 25.1°C | 21.4°C | 17.8°C | 27.2°C | 12.6°C | 102 mm | 86% | 0.3 m/s | 3.9 |
| 1997 | 26.4°C | 23.0°C | 19.6°C | 27.9°C | 17.1°C | 131 mm | 88% | 0.3 m/s | 4.2 |
| 1996 🌧️ | 24.8°C | 20.8°C | 16.8°C | 26.9°C | 13.4°C | 178 mm | 86% | 0.3 m/s | 4.5 |
| 1995 ❄️ | 25.3°C | 20.3°C | 15.3°C | 26.9°C | 13.7°C | 1 mm | 79% | 0.3 m/s | 5.4 |
| 1994 | 25.6°C | 20.8°C | 15.9°C | 27.3°C | 12.7°C | 7 mm | 81% | 0.3 m/s | 5.2 |
| 1993 | 25.3°C | 21.5°C | 17.7°C | 26.9°C | 14.6°C | 111 mm | 86% | 0.3 m/s | 4 |
| 1992 | 24.9°C | 20.6°C | 16.3°C | 26.9°C | 13.1°C | 15 mm | 83% | 0.3 m/s | 4.8 |
| 1991 | 25.3°C | 21.0°C | 16.7°C | 27.1°C | 12.3°C | 18 mm | 83% | 0.3 m/s | 4.7 |
| 1990 | 26.7°C | 22.2°C | 17.8°C | 29.4°C | 14.9°C | 5 mm | 80% | 0.3 m/s | 4.7 |
| 1989 | 26.1°C | 21.6°C | 17.1°C | 27.6°C | 14.6°C | 23 mm | 81% | 0.3 m/s | 5.1 |
| 1988 | 26.6°C | 21.6°C | 16.7°C | 28.4°C | 13.8°C | 55 mm | 78% | 0.3 m/s | 5.1 |
| 1987 | 25.4°C | 22.0°C | 18.5°C | 26.7°C | 14.7°C | 127 mm | 88% | 0.3 m/s | 4.5 |
| 1986 🔥 | 28.1°C | 23.1°C | 18.1°C | 29.9°C | 15.3°C | 12 mm | 77% | 0.3 m/s | 4.7 |
| 1985 | 26.2°C | 21.8°C | 17.4°C | 28.1°C | 13.7°C | 70 mm | 81% | 0.3 m/s | 4.9 |
| 1984 | 26.0°C | 20.8°C | 15.6°C | 28.4°C | 12.0°C | 29 mm | 77% | 0.4 m/s | 5 |
| 1983 | 26.0°C | 22.3°C | 18.5°C | 28.4°C | 16.6°C | 112 mm | 85% | 0.3 m/s | — |
| 1982 | 26.8°C | 22.1°C | 17.3°C | 29.0°C | 15.1°C | 9 mm | 76% | 0.3 m/s | — |
| 1981 | 25.3°C | 21.3°C | 17.3°C | 26.6°C | 13.8°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 25.9°C with lows near 17.4°C (mean 21.7°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 0.4°C — but days and nights have moved in opposite directions. Overnight lows rose from 17.2°C to 18.4°C while daytime highs eased from 26.1°C to 25.9°C, narrowing the gap between day and night.
December is one of the cooler months of the year in Idukki and one of the drier months, so plan for around 25.9°C daytime highs and 17.4°C at night.
Yes — December is the coldest month of the year in Idukki, averaging 21.7°C.
For December in Idukki, pack light layers you can adjust through the day, with typical highs of 25.9°C and lows of 17.4°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.
