December is one of the cooler months of the year in Ariyalur, with average highs near 30.2°C and lows around 18.5°C (mean 24.4°C). It is a relatively wet time of year, averaging 115 mm of rainfall and 84% relative humidity across the period.
December is one of the cooler months of the year in Ariyalur. Across 45 years of records, the warmest December in Ariyalur was 2016 — when the month averaged 26°C — while the coldest was 2007 at 22.6°C. Typical December days reach 30.2°C with nights near 18.5°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 | 24.7°C | 24.3°C | 23.7°C | 24.5°C | 24.6°C | -0.1°C |
| Avg High | 30.7°C | 30.4°C | 29.6°C | 30.3°C | 30.1°C | -0.6°C |
| Avg Low | 18.8°C | 18.3°C | 17.8°C | 18.6°C | 19.1°C | +0.3°C |
| Avg Rain | 100 mm | 125 mm | 96 mm | 109 mm | 161 mm | +61 mm |
December temperatures in Ariyalur have risen by about 0.3°C between 1981–1985 and 2021–2025.
December has ranged from a record low of 16°C (1996) to a record high of 34.2°C (2016).
Rainfall in December is a relatively wet time of year, averaging 115 mm, with a wettest year of 370 mm.
Daytime highs and overnight lows have shifted differently — highs fell about 0.1°C per decade while lows rose 0.1°C per decade, narrowing the gap between day and night.
One of the best times to visit Ariyalur
December is one of the best times to visit Ariyalur. Expect days averaging 30.2°C and nights around 18.5°C (mean 24.4°C) — cooler than Ariyalur's yearly average — with higher rainfall (115 mm), so conditions are generally comfortable for sightseeing and outdoor plans.
| Year | High | Low | Avg | Rainfall | Humidity | Wind | Solar |
|---|---|---|---|---|---|---|---|
| 2025 | 29.5°C | 18.0°C | 23.7°C | 61 mm | 86% | 2.8 m/s | — |
| 2024 | 30.6°C | 20.4°C | 25.5°C | 241 mm | 89% | 2.7 m/s | 3.8 |
| 2023 | 31.1°C | 20.5°C | 25.8°C | 82 mm | 88% | 3.2 m/s | 3.6 |
| 2022 | 29.6°C | 19.5°C | 24.6°C | 150 mm | 88% | 2.9 m/s | 3.9 |
| 2021 | 30.8°C | 17.3°C | 24.1°C | 63 mm | 87% | 2.6 m/s | 4.5 |
| 2020 🌧️ | 28.8°C | 19.0°C | 23.9°C | 370 mm | 89% | 3.2 m/s | 3.6 |
| 2019 | 29.1°C | 20.5°C | 24.8°C | 131 mm | 87% | 2.9 m/s | 4.1 |
| 2018 | 30.3°C | 18.5°C | 24.4°C | 46 mm | 86% | 2.6 m/s | 4.2 |
| 2017 | 29.5°C | 18.6°C | 24.1°C | 96 mm | 86% | 2.7 m/s | 4.3 |
| 2016 🔥 | 34.2°C | 17.9°C | 26.0°C | 67 mm | 72% | 3 m/s | 4.4 |
| 2015 | 29.3°C | 19.9°C | 24.6°C | 239 mm | 89% | 2.8 m/s | 3.8 |
| 2014 | 29.2°C | 18.8°C | 24.0°C | 82 mm | 88% | 3.1 m/s | 3.6 |
| 2013 | 30.6°C | 17.1°C | 23.9°C | 96 mm | 80% | 2.9 m/s | 4.4 |
| 2012 | 31.2°C | 18.9°C | 25.0°C | 40 mm | 83% | 3.3 m/s | 4.4 |
| 2011 | 30.2°C | 17.2°C | 23.7°C | 82 mm | 85% | 3 m/s | 4.2 |
| 2010 | 29.7°C | 18.5°C | 24.1°C | 210 mm | 90% | 2.7 m/s | 3.5 |
| 2009 | 29.4°C | 18.9°C | 24.1°C | 187 mm | 88% | 3 m/s | 3.5 |
| 2008 | 29.4°C | 17.5°C | 23.4°C | 63 mm | 87% | 2.7 m/s | 4.3 |
| 2007 ❄️ | 28.9°C | 16.4°C | 22.6°C | 269 mm | 87% | 2.9 m/s | 4 |
| 2006 | 29.0°C | 18.0°C | 23.5°C | 52 mm | 83% | 3.2 m/s | 4.4 |
| 2005 | 29.1°C | 18.0°C | 23.5°C | 130 mm | 89% | 2.9 m/s | 4.1 |
| 2004 | 28.6°C | 16.9°C | 22.7°C | 34 mm | 85% | 3.1 m/s | 4.6 |
| 2003 | 30.6°C | 18.6°C | 24.6°C | 10 mm | 82% | 3 m/s | 4.8 |
| 2002 | 31.1°C | 17.9°C | 24.5°C | 52 mm | 79% | 3.1 m/s | 4.7 |
| 2001 | 30.1°C | 18.5°C | 24.3°C | 68 mm | 82% | 3.4 m/s | 4.1 |
| 2000 | 29.8°C | 17.7°C | 23.8°C | 96 mm | 83% | 3.2 m/s | 4.4 |
| 1999 | 29.5°C | 17.1°C | 23.3°C | 74 mm | 84% | 3.2 m/s | 4.4 |
| 1998 | 29.7°C | 17.8°C | 23.8°C | 254 mm | 87% | 3.2 m/s | 3.7 |
| 1997 | 29.9°C | 20.5°C | 25.2°C | 182 mm | 89% | 2.4 m/s | 3.9 |
| 1996 | 32.7°C | 16.0°C | 24.3°C | 329 mm | 85% | 2.9 m/s | 3.9 |
| 1995 | 31.1°C | 19.5°C | 25.3°C | 10 mm | 71% | 3.3 m/s | 4.6 |
| 1994 | 30.7°C | 17.8°C | 24.2°C | 62 mm | 79% | 3.2 m/s | 4.6 |
| 1993 | 28.5°C | 18.6°C | 23.6°C | 231 mm | 89% | 3.4 m/s | 3.5 |
| 1992 | 28.9°C | 18.1°C | 23.5°C | 60 mm | 83% | 3.3 m/s | 4.3 |
| 1991 | 30.4°C | 18.5°C | 24.4°C | 35 mm | 84% | 2.8 m/s | 4.3 |
| 1990 | 32.3°C | 19.4°C | 25.8°C | 12 mm | 78% | 3.4 m/s | 4.3 |
| 1989 | 30.8°C | 18.6°C | 24.7°C | 64 mm | 81% | 3 m/s | 4.5 |
| 1988 | 32.6°C | 18.5°C | 25.5°C | 29 mm | 74% | 3.1 m/s | 4.7 |
| 1987 | 31.6°C | 19.3°C | 25.4°C | 226 mm | 86% | 3 m/s | 3.6 |
| 1986 | 30.8°C | 18.9°C | 24.9°C | 85 mm | 82% | 3 m/s | 4.2 |
| 1985 | 29.6°C | 19.1°C | 24.4°C | 56 mm | 84% | 2.8 m/s | 4.5 |
| 1984 | 31.9°C | 17.4°C | 24.6°C | 59 mm | 79% | 2.8 m/s | 4.7 |
| 1983 | 29.3°C | 20.3°C | 24.8°C | 276 mm | 87% | 3.1 m/s | — |
| 1982 | 30.5°C | 20.1°C | 25.3°C | 38 mm | 77% | 3.3 m/s | — |
| 1981 | 29.1°C | 17.0°C | 23.1°C | 68 mm | 86% | 2.7 m/s | — |
Actual recorded December data for each year, 1981–2025 — sourced from NASA POWER.
The average high in December is around 30.2°C with lows near 18.5°C (mean 24.4°C), based on 45 years of NASA POWER data.
December averages 115 mm of rainfall in Ariyalur, a relatively wet time of year. The wettest on record was 370 mm in 2020.
The hottest December reached 34.2°C in 2016. The coldest dipped to 16°C in 1996.
Comparing the earliest years on record (1981–1985) with the most recent (2021–2025), average December temperatures have risen by about 0.3°C. Daytime highs moved from 30.1°C to 30.3°C and overnight lows from 18.8°C to 19.1°C over the same span.
December is one of the cooler months of the year in Ariyalur and a relatively wet time of year, so plan for around 30.2°C daytime highs and 18.5°C at night.
Yes — December is the coldest month of the year in Ariyalur, averaging 24.4°C.
For December in Ariyalur, pack light, breathable clothing and sun protection, with typical highs of 30.2°C and lows of 18.5°C. Bring an umbrella or light rain jacket too.
Relative humidity in December averages 84% — quite humid.
Average wind speed in December is 3 m/s. The windiest December on record averaged 3.4 m/s (1990).
The wettest December on record was 2020 with 370 mm. On average, December sees 115 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 Ariyalur 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.
