December is one of the cooler months of the year in Newnan, with average highs near 12.6°C and lows around 1.6°C (mean 7.1°C). It is a relatively wet time of year, averaging 118 mm of rainfall and 83% relative humidity across the period.
December is one of the cooler months of the year in Newnan. Across 45 years of records, the warmest December in Newnan was 2015 — when the month averaged 12.8°C — while the coldest was 1989 at 1.7°C. Typical December days reach 12.6°C with nights near 1.6°C. The long-term trend is warming, about 0.7°C per decade.
December is a relatively wet time of year in Newnan, averaging 118 mm of rainfall. The wettest December on record was 2015 with 321 mm, while the driest was 2010 at 34 mm.
Relative humidity in Newnan during December averages 83%. The most humid December was 2018 at 89%, and the least humid was 1999 at 75%.
December receives about 2.4 kWh/m²/day of solar energy in Newnan. The sunniest December was 2006 at 2.8 kWh/m²/day, and the cloudiest was 1992 at 1.9.
Average wind speed in Newnan during December is 0.1 m/s. The windiest December was 2006 at 0.2 m/s, while the calmest were 2015, 2019 and 2022, among others at 0 m/s.
Ranked against the other 11 months using 1981–2025 averages.
| Metric | 1980s | 1990s | 2000s | 2010s | 2020s | Change |
|---|---|---|---|---|---|---|
| Avg Temp | 5.7°C | 7.1°C | 6.4°C | 8.2°C | 8.4°C | +2.7°C |
| Avg High | 11.1°C | 12.4°C | 12.1°C | 13.5°C | 14.3°C | +3.2°C |
| Avg Low | 0.4°C | 1.8°C | 0.8°C | 2.9°C | 2.5°C | +2.1°C |
| Avg Rain | 124 mm | 99 mm | 111 mm | 155 mm | 87 mm | -36 mm |
December temperatures in Newnan have risen by about 2.7°C between 1981–1985 and 2021–2025.
December has ranged from a record low of -16.2°C (1983) to a record high of 25.4°C (2007).
Rainfall in December is a relatively wet time of year, averaging 118 mm, with a wettest year of 321 mm.
Daytime highs and overnight lows have shifted differently — highs rose about 0.8°C per decade while lows rose 0.6°C per decade, widening the gap between day and night.
A quieter season to visit Newnan
If your dates are flexible, the more temperate months of September and May tend to be the most comfortable for visiting Newnan. That said, December — with days averaging 12.6°C and nights around 1.6°C (mean 7.1°C) and higher rainfall (118 mm) — can still be rewarding for travellers who don't mind the cooler conditions, and often means fewer crowds.
| Year | Avg High | Avg Temp | Avg Low | Hottest Day | Coldest Day | Rainfall | Humidity | Wind | Solar |
|---|---|---|---|---|---|---|---|---|---|
| 2025 | 14.4°C | 7.9°C | 1.5°C | 24.7°C | -7.5°C | 41 mm | 76% | 0.1 m/s | — |
| 2024 | 13.5°C | 7.6°C | 1.7°C | 22.3°C | -6.6°C | 102 mm | 79% | 0.1 m/s | 2.6 |
| 2023 | 14.3°C | 8.2°C | 2.1°C | 21.8°C | -4.9°C | 95 mm | 77% | 0.1 m/s | 2.5 |
| 2022 | 12.8°C | 7.7°C | 2.7°C | 24.0°C | -12.7°C | 97 mm | 84% | 0 m/s | 2.2 |
| 2021 | 18.3°C | 12.3°C | 6.4°C | 24.2°C | -3.2°C | 114 mm | 85% | 0.1 m/s | 2.1 |
| 2020 | 12.5°C | 6.4°C | 0.4°C | 18.7°C | -6.0°C | 74 mm | 83% | 0.1 m/s | 2.7 |
| 2019 | 14.0°C | 8.9°C | 3.8°C | 21.8°C | -4.6°C | 154 mm | 84% | 0 m/s | 2.3 |
| 2018 | 11.8°C | 7.4°C | 3.1°C | 21.6°C | -5.1°C | 259 mm | 89% | 0.1 m/s | 2.1 |
| 2017 | 12.4°C | 7.1°C | 1.8°C | 22.4°C | -6.1°C | 74 mm | 80% | 0.1 m/s | 2.2 |
| 2016 | 13.9°C | 8.2°C | 2.5°C | 23.0°C | -5.7°C | 88 mm | 80% | 0.1 m/s | 2.3 |
| 2015 🔥 🌧️ | 17.6°C | 12.8°C | 8.0°C | 24.3°C | -4.2°C | 321 mm | 89% | 0 m/s | 2.2 |
| 2014 | 14.2°C | 8.8°C | 3.4°C | 21.4°C | -3.7°C | 131 mm | 86% | 0.1 m/s | 2.3 |
| 2013 | 12.9°C | 7.6°C | 2.3°C | 24.3°C | -5.7°C | 211 mm | 86% | 0 m/s | 2.1 |
| 2012 | 15.3°C | 9.6°C | 3.9°C | 22.7°C | -4.1°C | 167 mm | 81% | 0.1 m/s | 2.2 |
| 2011 | 14.6°C | 8.9°C | 3.2°C | 21.0°C | -3.7°C | 112 mm | 84% | 0.1 m/s | 2.5 |
| 2010 | 7.8°C | 2.4°C | -3.1°C | 16.6°C | -9.3°C | 34 mm | 76% | 0.1 m/s | 2.5 |
| 2009 | 10.0°C | 5.0°C | 0.1°C | 19.5°C | -4.8°C | 230 mm | 88% | 0 m/s | 2 |
| 2008 | 13.3°C | 8.0°C | 2.7°C | 21.0°C | -8.6°C | 139 mm | 85% | 0 m/s | 2.1 |
| 2007 | 15.7°C | 9.9°C | 4.0°C | 25.4°C | -4.6°C | 109 mm | 79% | 0 m/s | 2.3 |
| 2006 | 15.1°C | 8.8°C | 2.5°C | 21.5°C | -7.3°C | 74 mm | 81% | 0.2 m/s | 2.8 |
| 2005 | 10.7°C | 5.0°C | -0.8°C | 20.3°C | -5.3°C | 91 mm | 81% | 0.1 m/s | 2.6 |
| 2004 | 11.8°C | 5.8°C | -0.1°C | 21.7°C | -7.3°C | 92 mm | 82% | 0.1 m/s | 2.7 |
| 2003 | 11.1°C | 4.9°C | -1.3°C | 16.7°C | -5.8°C | 74 mm | 80% | 0.1 m/s | 2.7 |
| 2002 | 10.7°C | 5.6°C | 0.5°C | 16.8°C | -5.3°C | 160 mm | 86% | 0 m/s | 2.3 |
| 2001 | 15.4°C | 9.3°C | 3.3°C | 23.6°C | -6.5°C | 73 mm | 77% | 0 m/s | 2.6 |
| 2000 | 7.0°C | 2.1°C | -2.7°C | 18.1°C | -9.4°C | 68 mm | 81% | 0.1 m/s | 2.3 |
| 1999 | 13.9°C | 7.4°C | 0.8°C | 20.9°C | -6.4°C | 65 mm | 75% | 0.1 m/s | 2.7 |
| 1998 | 15.2°C | 9.8°C | 4.4°C | 25.3°C | -3.2°C | 85 mm | 82% | 0.1 m/s | 2.1 |
| 1997 | 10.7°C | 5.7°C | 0.6°C | 18.2°C | -5.6°C | 137 mm | 88% | 0.1 m/s | 2.4 |
| 1996 | 12.7°C | 7.2°C | 1.7°C | 22.3°C | -7.7°C | 96 mm | 84% | 0.1 m/s | 2.4 |
| 1995 | 10.3°C | 5.2°C | 0.0°C | 20.1°C | -8.9°C | 101 mm | 83% | 0.1 m/s | 2.5 |
| 1994 | 12.8°C | 7.9°C | 2.9°C | 19.7°C | -4.2°C | 70 mm | 87% | 0.1 m/s | 2.2 |
| 1993 | 10.4°C | 5.5°C | 0.6°C | 19.4°C | -5.9°C | 83 mm | 84% | 0.1 m/s | 2.4 |
| 1992 | 10.5°C | 6.0°C | 1.5°C | 19.5°C | -3.8°C | 149 mm | 89% | 0 m/s | 1.9 |
| 1991 | 13.3°C | 7.7°C | 2.0°C | 23.1°C | -5.5°C | 100 mm | 82% | 0.1 m/s | 2.5 |
| 1990 | 14.2°C | 8.7°C | 3.3°C | 22.2°C | -6.6°C | 105 mm | 84% | 0.1 m/s | 2.1 |
| 1989 ❄️ | 6.8°C | 1.7°C | -3.3°C | 16.8°C | -15.3°C | 141 mm | 83% | 0.1 m/s | 2.4 |
| 1988 | 11.9°C | 5.7°C | -0.4°C | 20.0°C | -6.1°C | 51 mm | 83% | 0.1 m/s | 2.6 |
| 1987 | 14.0°C | 8.3°C | 2.5°C | 23.0°C | -5.4°C | 106 mm | 79% | 0 m/s | 2.3 |
| 1986 | 10.5°C | 5.7°C | 0.9°C | 18.5°C | -4.5°C | 73 mm | 88% | 0.1 m/s | 2 |
| 1985 | 9.4°C | 3.6°C | -2.1°C | 19.5°C | -9.4°C | 70 mm | 79% | 0.1 m/s | 2.6 |
| 1984 | 16.5°C | 10.7°C | 4.9°C | 22.5°C | -7.5°C | 82 mm | 86% | 0.1 m/s | 2.4 |
| 1983 | 8.9°C | 3.6°C | -1.7°C | 19.8°C | -16.2°C | 253 mm | 83% | 0.1 m/s | — |
| 1982 | 13.6°C | 9.0°C | 4.3°C | 23.3°C | -5.9°C | 184 mm | 89% | 0 m/s | — |
| 1981 | 8.1°C | 3.3°C | -1.6°C | 17.3°C | -11.4°C | 155 mm | 79% | 0 m/s | — |
Actual recorded December data for each year, 1981–2025 — sourced from NASA POWER.
The average high in December is around 12.6°C with lows near 1.6°C (mean 7.1°C), based on 45 years of NASA POWER data.
December averages 118 mm of rainfall in Newnan, a relatively wet time of year. The wettest on record was 321 mm in 2015.
The hottest December reached 25.4°C in 2007. The coldest dipped to -16.2°C in 1983.
Comparing the earliest years on record (1981–1985) with the most recent (2021–2025), average December temperatures have risen by about 2.7°C. Daytime highs moved from 11.3°C to 14.7°C and overnight lows from 0.8°C to 2.9°C over the same span.
December is one of the cooler months of the year in Newnan and a relatively wet time of year, so plan for around 12.6°C daytime highs and 1.6°C at night.
Not quite — December is the 2nd coolest month in Newnan, averaging 7.1°C.
For December in Newnan, pack warm layers and a jacket for chilly mornings, with typical highs of 12.6°C and lows of 1.6°C. Bring an umbrella or light rain jacket too.
Relative humidity in December averages 83% — quite humid.
Average wind speed in December is 0.1 m/s. The windiest December on record averaged 0.2 m/s (2006).
The wettest December on record was 2015 with 321 mm. On average, December sees 118 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 Newnan 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.
