December is one of the cooler months of the year in Chengalpattu, with average highs near 28.7°C and lows around 20.4°C (mean 24.5°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 December in Chengalpattu was 1997 — when the month averaged 26.1°C — while the coldest was 1994 at 23.2°C. Typical December days reach 28.7°C with nights near 20.4°C. The long-term trend is warming, about 0.2°C per decade.
Ranked against the other 11 months using 1981–2025 averages.
| Metric | 1980s | 1990s | 2000s | 2010s | 2020s | Change |
|---|---|---|---|---|---|---|
| Avg Temp | 24.5°C | 24.4°C | 24.3°C | 24.8°C | 25.1°C | +0.6°C |
| Avg High | 28.5°C | 28.4°C | 28.5°C | 29.1°C | 29.2°C | +0.7°C |
| Avg Low | 20.5°C | 20.4°C | 20.1°C | 20.6°C | 21.0°C | +0.5°C |
| Avg Rain | 131 mm | 175 mm | 112 mm | 134 mm | 187 mm | +56 mm |
December temperatures in Chengalpattu have risen by about 0.9°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 28.7°C and nights around 20.4°C (mean 24.5°C) — cooler than Chengalpattu's yearly average — with higher rainfall (144 mm), so conditions are generally comfortable for sightseeing and outdoor plans.
| Year | High | Low | Avg | Rainfall | Humidity | Wind | Solar |
|---|---|---|---|---|---|---|---|
| 2025 | 28.5°C | 20.4°C | 24.5°C | 121 mm | 80% | 3.9 m/s | — |
| 2024 | 29.5°C | 21.1°C | 25.3°C | 237 mm | 86% | 4 m/s | 3.6 |
| 2023 | 29.8°C | 21.7°C | 25.7°C | 205 mm | 84% | 4.3 m/s | 3.5 |
| 2022 | 29.0°C | 21.5°C | 25.3°C | 171 mm | 85% | 3.9 m/s | 3.8 |
| 2021 | 30.0°C | 19.7°C | 24.8°C | 114 mm | 81% | 3.4 m/s | 4.4 |
| 2020 | 28.2°C | 21.4°C | 24.8°C | 272 mm | 82% | 4 m/s | 3.8 |
| 2019 | 28.8°C | 22.6°C | 25.7°C | 126 mm | 81% | 3.7 m/s | 3.9 |
| 2018 | 29.7°C | 20.6°C | 25.1°C | 68 mm | 81% | 3.7 m/s | 4.2 |
| 2017 | 28.7°C | 20.1°C | 24.4°C | 43 mm | 80% | 3.6 m/s | 4.4 |
| 2016 | 30.2°C | 19.4°C | 24.8°C | 156 mm | 75% | 3.7 m/s | 4.3 |
| 2015 | 28.6°C | 20.9°C | 24.7°C | 278 mm | 83% | 3.5 m/s | 4.1 |
| 2014 | 28.3°C | 20.4°C | 24.3°C | 128 mm | 83% | 4.1 m/s | 3.7 |
| 2013 | 29.7°C | 19.9°C | 24.8°C | 59 mm | 76% | 4 m/s | 4.4 |
| 2012 | 28.9°C | 22.0°C | 25.4°C | 116 mm | 81% | 3.9 m/s | 4.3 |
| 2011 | 29.1°C | 19.7°C | 24.4°C | 148 mm | 80% | 4.1 m/s | 4.1 |
| 2010 | 29.3°C | 20.1°C | 24.7°C | 216 mm | 83% | 3.8 m/s | 3.3 |
| 2009 | 28.3°C | 21.9°C | 25.1°C | 178 mm | 82% | 3.9 m/s | 3.8 |
| 2008 | 27.9°C | 19.6°C | 23.8°C | 34 mm | 79% | 3.3 m/s | 4.7 |
| 2007 | 28.4°C | 18.4°C | 23.4°C | 207 mm | 82% | 3.7 m/s | 3.9 |
| 2006 | 28.2°C | 20.4°C | 24.3°C | 54 mm | 77% | 3.8 m/s | 4.3 |
| 2005 | 28.0°C | 20.1°C | 24.0°C | 276 mm | 85% | 4.4 m/s | 3.8 |
| 2004 | 28.4°C | 20.1°C | 24.2°C | 27 mm | 77% | 3.8 m/s | 4.8 |
| 2003 | 29.9°C | 20.5°C | 25.2°C | 40 mm | 77% | 3.9 m/s | 4.6 |
| 2002 | 28.1°C | 19.8°C | 24.0°C | 61 mm | 80% | 3.4 m/s | 4.7 |
| 2001 | 28.5°C | 20.3°C | 24.4°C | 170 mm | 79% | 4 m/s | 4.2 |
| 2000 | 29.0°C | 19.6°C | 24.3°C | 73 mm | 78% | 4.1 m/s | 4.5 |
| 1999 | 28.4°C | 19.8°C | 24.1°C | 105 mm | 79% | 4.1 m/s | 4.4 |
| 1998 | 29.2°C | 20.4°C | 24.8°C | 273 mm | 80% | 4.3 m/s | 3.9 |
| 1997 🔥 | 29.3°C | 22.8°C | 26.1°C | 327 mm | 84% | 3.2 m/s | 3.9 |
| 1996 🌧️ | 28.8°C | 19.0°C | 23.9°C | 439 mm | 82% | 4 m/s | 3.8 |
| 1995 | 28.4°C | 20.4°C | 24.4°C | 12 mm | 73% | 3.8 m/s | 4.8 |
| 1994 ❄️ | 27.5°C | 19.0°C | 23.2°C | 183 mm | 77% | 3.7 m/s | 4.7 |
| 1993 | 27.8°C | 20.8°C | 24.3°C | 270 mm | 83% | 4.4 m/s | 3.6 |
| 1992 | 27.8°C | 19.7°C | 23.8°C | 107 mm | 77% | 4.1 m/s | 4.4 |
| 1991 | 28.2°C | 20.8°C | 24.5°C | 18 mm | 80% | 3.5 m/s | 4.4 |
| 1990 | 28.9°C | 21.1°C | 25.0°C | 12 mm | 80% | 4.2 m/s | 4.4 |
| 1989 | 28.2°C | 20.9°C | 24.5°C | 101 mm | 79% | 3.7 m/s | 4.5 |
| 1988 | 28.7°C | 20.7°C | 24.7°C | 79 mm | 79% | 3.7 m/s | 4.7 |
| 1987 | 29.3°C | 20.9°C | 25.1°C | 289 mm | 84% | 4.4 m/s | 3.5 |
| 1986 | 28.7°C | 21.3°C | 25.0°C | 91 mm | 81% | 3.8 m/s | 4.4 |
| 1985 | 27.8°C | 20.1°C | 24.0°C | 109 mm | 83% | 3.4 m/s | 4.7 |
| 1984 | 28.6°C | 19.4°C | 24.0°C | 64 mm | 80% | 3.4 m/s | 4.6 |
| 1983 | 28.0°C | 21.2°C | 24.6°C | 287 mm | 84% | 4.1 m/s | — |
| 1982 | 28.9°C | 21.0°C | 25.0°C | 31 mm | 76% | 3.9 m/s | — |
| 1981 | 28.0°C | 18.7°C | 23.3°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 28.7°C with lows near 20.4°C (mean 24.5°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 0.9°C. Daytime highs moved from 28.3°C to 29.4°C and overnight lows from 20.1°C to 20.9°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 28.7°C daytime highs and 20.4°C at night.
Not quite — December is the 2nd coolest month in Chengalpattu, averaging 24.5°C.
For December in Chengalpattu, pack light layers you can adjust through the day, with typical highs of 28.7°C and lows of 20.4°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.
