December is one of the cooler months of the year in Chengalpattu, with average highs near 27.5°C and lows around 22.7°C (mean 25.1°C). It is a relatively wet time of year, averaging 144 mm of rainfall and 80% relative humidity across the period.
December is one of the cooler months of the year in Chengalpattu. Across 45 years of records, the warmest Decembers in Chengalpattu were 1997 and 2024 — when the month averaged 26.2°C — while the coldest was 1994 at 24°C. Typical December days reach 27.5°C with nights near 22.7°C. The long-term trend is warming, about 0.2°C per decade.
December is a relatively wet time of year in Chengalpattu, averaging 144 mm of rainfall. The wettest December on record was 1996 with 439 mm, while the driest was 1995 at 12 mm.
Relative humidity in Chengalpattu during December averages 80%. The most humid December was 2024 at 86%, and the least humid was 1995 at 73%.
December receives about 4.2 kWh/m²/day of solar energy in Chengalpattu. The sunniest Decembers were 1995 and 2004 at 4.8 kWh/m²/day, and the cloudiest was 2010 at 3.3.
Average wind speed in Chengalpattu during December is 3.9 m/s. The windiest Decembers were 1987, 1993 and 2005 at 4.4 m/s, while the calmest was 1997 at 3.2 m/s.
Ranked against the other 11 months using 1981–2025 averages.
| Metric | 1980s | 1990s | 2000s | 2010s | 2020s | Change |
|---|---|---|---|---|---|---|
| Avg Temp | 25.0°C | 24.8°C | 25.0°C | 25.3°C | 25.6°C | +0.6°C |
| Avg High | 27.4°C | 27.2°C | 27.4°C | 27.8°C | 27.8°C | +0.4°C |
| Avg Low | 22.6°C | 22.4°C | 22.5°C | 22.9°C | 23.4°C | +0.8°C |
| Avg Rain | 131 mm | 175 mm | 112 mm | 134 mm | 187 mm | +56 mm |
December temperatures in Chengalpattu have risen by about 0.8°C between 1981–1985 and 2021–2025.
December has ranged from a record low of 18.4°C (2007) to a record high of 30.2°C (2016).
Rainfall in December is a relatively wet time of year, averaging 144 mm, with a wettest year of 439 mm.
One of the best times to visit Chengalpattu
December is one of the best times to visit Chengalpattu. Expect days averaging 27.5°C and nights around 22.7°C (mean 25.1°C) — cooler than Chengalpattu's yearly average — with higher rainfall (144 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 | 27.3°C | 24.9°C | 22.4°C | 28.5°C | 20.4°C | 121 mm | 80% | 3.9 m/s | — |
| 2024 | 28.2°C | 26.2°C | 24.1°C | 29.5°C | 21.1°C | 237 mm | 86% | 4 m/s | 3.6 |
| 2023 | 28.2°C | 26.1°C | 24.0°C | 29.8°C | 21.7°C | 205 mm | 84% | 4.3 m/s | 3.5 |
| 2022 | 27.7°C | 25.6°C | 23.5°C | 29.0°C | 21.5°C | 171 mm | 85% | 3.9 m/s | 3.8 |
| 2021 | 27.8°C | 25.5°C | 23.2°C | 30.0°C | 19.7°C | 114 mm | 81% | 3.4 m/s | 4.4 |
| 2020 | 27.3°C | 25.3°C | 23.3°C | 28.2°C | 21.4°C | 272 mm | 82% | 4 m/s | 3.8 |
| 2019 | 28.0°C | 25.9°C | 23.8°C | 28.8°C | 22.6°C | 126 mm | 81% | 3.7 m/s | 3.9 |
| 2018 | 28.1°C | 25.4°C | 22.8°C | 29.7°C | 20.6°C | 68 mm | 81% | 3.7 m/s | 4.2 |
| 2017 | 27.7°C | 25.2°C | 22.7°C | 28.7°C | 20.1°C | 43 mm | 80% | 3.6 m/s | 4.4 |
| 2016 | 28.6°C | 25.3°C | 22.0°C | 30.2°C | 19.4°C | 156 mm | 75% | 3.7 m/s | 4.3 |
| 2015 | 27.6°C | 25.5°C | 23.4°C | 28.6°C | 20.9°C | 278 mm | 83% | 3.5 m/s | 4.1 |
| 2014 | 27.3°C | 25.1°C | 22.9°C | 28.3°C | 20.4°C | 128 mm | 83% | 4.1 m/s | 3.7 |
| 2013 | 28.0°C | 25.1°C | 22.2°C | 29.7°C | 19.9°C | 59 mm | 76% | 4 m/s | 4.4 |
| 2012 | 27.9°C | 25.6°C | 23.3°C | 28.9°C | 22.0°C | 116 mm | 81% | 3.9 m/s | 4.3 |
| 2011 | 27.5°C | 25.2°C | 22.8°C | 29.1°C | 19.7°C | 148 mm | 80% | 4.1 m/s | 4.1 |
| 2010 | 27.0°C | 25.0°C | 23.0°C | 29.3°C | 20.1°C | 216 mm | 83% | 3.8 m/s | 3.3 |
| 2009 | 27.4°C | 25.4°C | 23.5°C | 28.3°C | 21.9°C | 178 mm | 82% | 3.9 m/s | 3.8 |
| 2008 | 27.4°C | 25.0°C | 22.5°C | 27.9°C | 19.6°C | 34 mm | 79% | 3.3 m/s | 4.7 |
| 2007 | 27.3°C | 24.9°C | 22.6°C | 28.4°C | 18.4°C | 207 mm | 82% | 3.7 m/s | 3.9 |
| 2006 | 27.5°C | 25.1°C | 22.7°C | 28.2°C | 20.4°C | 54 mm | 77% | 3.8 m/s | 4.3 |
| 2005 | 26.7°C | 24.7°C | 22.6°C | 28.0°C | 20.1°C | 276 mm | 85% | 4.4 m/s | 3.8 |
| 2004 | 27.4°C | 24.6°C | 21.8°C | 28.4°C | 20.1°C | 27 mm | 77% | 3.8 m/s | 4.8 |
| 2003 | 28.3°C | 25.4°C | 22.6°C | 29.9°C | 20.5°C | 40 mm | 77% | 3.9 m/s | 4.6 |
| 2002 | 27.4°C | 24.6°C | 21.7°C | 28.1°C | 19.8°C | 61 mm | 80% | 3.4 m/s | 4.7 |
| 2001 | 27.3°C | 24.9°C | 22.6°C | 28.5°C | 20.3°C | 170 mm | 79% | 4 m/s | 4.2 |
| 2000 | 27.6°C | 24.9°C | 22.1°C | 29.0°C | 19.6°C | 73 mm | 78% | 4.1 m/s | 4.5 |
| 1999 | 27.3°C | 24.6°C | 21.9°C | 28.4°C | 19.8°C | 105 mm | 79% | 4.1 m/s | 4.4 |
| 1998 | 27.4°C | 25.1°C | 22.7°C | 29.2°C | 20.4°C | 273 mm | 80% | 4.3 m/s | 3.9 |
| 1997 🔥 | 28.0°C | 26.2°C | 24.3°C | 29.3°C | 22.8°C | 327 mm | 84% | 3.2 m/s | 3.9 |
| 1996 🌧️ | 26.5°C | 24.3°C | 22.0°C | 28.8°C | 19.0°C | 439 mm | 82% | 4 m/s | 3.8 |
| 1995 | 27.6°C | 24.8°C | 22.0°C | 28.4°C | 20.4°C | 12 mm | 73% | 3.8 m/s | 4.8 |
| 1994 ❄️ | 26.7°C | 24.0°C | 21.3°C | 27.5°C | 19.0°C | 183 mm | 77% | 3.7 m/s | 4.7 |
| 1993 | 26.7°C | 24.6°C | 22.6°C | 27.8°C | 20.8°C | 270 mm | 83% | 4.4 m/s | 3.6 |
| 1992 | 26.9°C | 24.5°C | 22.1°C | 27.8°C | 19.7°C | 107 mm | 77% | 4.1 m/s | 4.4 |
| 1991 | 27.0°C | 24.6°C | 22.3°C | 28.2°C | 20.8°C | 18 mm | 80% | 3.5 m/s | 4.4 |
| 1990 | 27.8°C | 25.4°C | 23.0°C | 28.9°C | 21.1°C | 12 mm | 80% | 4.2 m/s | 4.4 |
| 1989 | 27.1°C | 24.7°C | 22.4°C | 28.2°C | 20.9°C | 101 mm | 79% | 3.7 m/s | 4.5 |
| 1988 | 27.6°C | 25.0°C | 22.4°C | 28.7°C | 20.7°C | 79 mm | 79% | 3.7 m/s | 4.7 |
| 1987 | 27.4°C | 25.4°C | 23.4°C | 29.3°C | 20.9°C | 289 mm | 84% | 4.4 m/s | 3.5 |
| 1986 | 28.0°C | 25.7°C | 23.3°C | 28.7°C | 21.3°C | 91 mm | 81% | 3.8 m/s | 4.4 |
| 1985 | 27.0°C | 24.5°C | 22.1°C | 27.8°C | 20.1°C | 109 mm | 83% | 3.4 m/s | 4.7 |
| 1984 | 27.5°C | 24.6°C | 21.7°C | 28.6°C | 19.4°C | 64 mm | 80% | 3.4 m/s | 4.6 |
| 1983 | 27.2°C | 25.2°C | 23.3°C | 28.0°C | 21.2°C | 287 mm | 84% | 4.1 m/s | — |
| 1982 | 28.0°C | 25.4°C | 22.8°C | 28.9°C | 21.0°C | 31 mm | 76% | 3.9 m/s | — |
| 1981 | 27.1°C | 24.7°C | 22.3°C | 28.0°C | 18.7°C | 123 mm | 82% | 3.9 m/s | — |
Actual recorded December data for each year, 1981–2025 — sourced from NASA POWER.
The average high in December is around 27.5°C with lows near 22.7°C (mean 25.1°C), based on 45 years of NASA POWER data.
December averages 144 mm of rainfall in Chengalpattu, a relatively wet time of year. The wettest on record was 439 mm in 1996.
The hottest December reached 30.2°C in 2016. The coldest dipped to 18.4°C in 2007.
Comparing the earliest years on record (1981–1985) with the most recent (2021–2025), average December temperatures have risen by about 0.8°C. Daytime highs moved from 27.4°C to 27.8°C and overnight lows from 22.4°C to 23.4°C over the same span.
December is one of the cooler months of the year in Chengalpattu and a relatively wet time of year, so plan for around 27.5°C daytime highs and 22.7°C at night.
Not quite — December is the 2nd coolest month in Chengalpattu, averaging 25.1°C.
For December in Chengalpattu, pack light layers you can adjust through the day, with typical highs of 27.5°C and lows of 22.7°C. Bring an umbrella or light rain jacket too.
Relative humidity in December averages 80% — quite humid.
Average wind speed in December is 3.9 m/s. The windiest December on record averaged 4.4 m/s (1987).
The wettest December on record was 1996 with 439 mm. On average, December sees 144 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 Chengalpattu 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.
