December is one of the cooler months of the year in Snellville, with average highs near 11.9°C and lows around 1.3°C (mean 6.6°C). It is about average for rainfall, averaging 117 mm of rainfall and 82% relative humidity across the period.
December is one of the cooler months of the year in Snellville. Across 45 years of records, the warmest December in Snellville was 2015 — when the month averaged 12.6°C — while the coldest was 1989 at 1.5°C. Typical December days reach 11.9°C with nights near 1.3°C. The long-term trend is warming, about 0.7°C per decade.
December is about average for rainfall in Snellville, averaging 117 mm of rainfall. The wettest December on record was 2015 with 300 mm, while the driest was 2010 at 39 mm.
Relative humidity in Snellville during December averages 82%. The most humid December was 2015 at 90%, and the least humid was 2001 at 74%.
December receives about 2.4 kWh/m²/day of solar energy in Snellville. The sunniest December was 2006 at 2.8 kWh/m²/day, and the cloudiest was 1992 at 1.9.
Average wind speed in Snellville during December is 0.5 m/s. The windiest Decembers were 2019, 2023 and 2025, among others at 0.6 m/s, while the calmest were 2021, 2022 and 2024, among others at 0.5 m/s.
Ranked against the other 11 months using 1981–2025 averages.
| Metric | 1980s | 1990s | 2000s | 2010s | 2020s | Change |
|---|---|---|---|---|---|---|
| Avg Temp | 5.3°C | 6.4°C | 6.1°C | 7.8°C | 7.7°C | +2.4°C |
| Avg High | 10.5°C | 11.5°C | 11.6°C | 12.9°C | 13.4°C | +2.9°C |
| Avg Low | 0.2°C | 1.4°C | 0.6°C | 2.6°C | 2.0°C | +1.8°C |
| Avg Rain | 117 mm | 96 mm | 115 mm | 150 mm | 99 mm | -17 mm |
December temperatures in Snellville have risen by about 2.4°C between 1981–1985 and 2021–2025.
December has ranged from a record low of -16.1°C (1983) to a record high of 24.9°C (2007).
Rainfall in December is about average for rainfall, averaging 117 mm, with a wettest year of 300 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 Snellville
If your dates are flexible, the more temperate months of September and May tend to be the most comfortable for visiting Snellville. That said, December — with days averaging 11.9°C and nights around 1.3°C (mean 6.6°C) and higher rainfall (117 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 | 13.5°C | 7.4°C | 1.3°C | 23.8°C | -7.2°C | 44 mm | 76% | 0.6 m/s | — |
| 2024 | 12.7°C | 7.0°C | 1.3°C | 21.1°C | -6.3°C | 124 mm | 80% | 0.5 m/s | 2.6 |
| 2023 | 13.9°C | 8.0°C | 2.1°C | 19.6°C | -5.2°C | 122 mm | 76% | 0.6 m/s | 2.5 |
| 2022 | 11.6°C | 6.7°C | 1.8°C | 23.1°C | -13.1°C | 116 mm | 85% | 0.5 m/s | 2.2 |
| 2021 | 16.8°C | 11.2°C | 5.6°C | 22.6°C | -2.4°C | 107 mm | 86% | 0.5 m/s | 2.1 |
| 2020 | 11.9°C | 6.0°C | 0.1°C | 18.2°C | -5.6°C | 83 mm | 83% | 0.5 m/s | 2.7 |
| 2019 | 13.5°C | 8.4°C | 3.3°C | 19.4°C | -4.0°C | 139 mm | 81% | 0.6 m/s | 2.3 |
| 2018 | 11.0°C | 6.8°C | 2.7°C | 20.6°C | -4.9°C | 266 mm | 89% | 0.5 m/s | 2.1 |
| 2017 | 12.0°C | 6.7°C | 1.4°C | 21.1°C | -5.9°C | 74 mm | 80% | 0.5 m/s | 2.2 |
| 2016 | 13.2°C | 7.7°C | 2.1°C | 22.2°C | -5.1°C | 78 mm | 79% | 0.5 m/s | 2.3 |
| 2015 🔥 🌧️ | 17.3°C | 12.6°C | 7.9°C | 23.5°C | -4.2°C | 300 mm | 90% | 0.5 m/s | 2.2 |
| 2014 | 13.8°C | 8.4°C | 3.1°C | 20.3°C | -4.1°C | 114 mm | 86% | 0.5 m/s | 2.3 |
| 2013 | 12.5°C | 7.5°C | 2.5°C | 23.3°C | -4.9°C | 217 mm | 85% | 0.5 m/s | 2.1 |
| 2012 | 14.5°C | 9.2°C | 3.9°C | 22.0°C | -4.2°C | 152 mm | 80% | 0.6 m/s | 2.2 |
| 2011 | 14.3°C | 8.7°C | 3.1°C | 21.3°C | -2.9°C | 115 mm | 83% | 0.5 m/s | 2.5 |
| 2010 | 7.1°C | 1.8°C | -3.6°C | 15.3°C | -9.0°C | 39 mm | 77% | 0.6 m/s | 2.5 |
| 2009 | 9.1°C | 4.3°C | -0.4°C | 18.5°C | -4.1°C | 224 mm | 88% | 0.6 m/s | 2 |
| 2008 | 13.0°C | 7.9°C | 2.7°C | 20.3°C | -8.0°C | 125 mm | 84% | 0.5 m/s | 2.1 |
| 2007 | 14.9°C | 9.3°C | 3.6°C | 24.9°C | -4.7°C | 121 mm | 79% | 0.5 m/s | 2.3 |
| 2006 | 14.8°C | 8.7°C | 2.7°C | 21.3°C | -7.4°C | 89 mm | 80% | 0.6 m/s | 2.8 |
| 2005 | 10.0°C | 4.5°C | -1.1°C | 19.3°C | -5.1°C | 110 mm | 83% | 0.6 m/s | 2.6 |
| 2004 | 11.3°C | 5.5°C | -0.2°C | 20.6°C | -7.3°C | 111 mm | 81% | 0.6 m/s | 2.7 |
| 2003 | 10.6°C | 4.4°C | -1.7°C | 16.4°C | -5.6°C | 74 mm | 80% | 0.6 m/s | 2.7 |
| 2002 | 10.1°C | 5.0°C | 0.0°C | 15.6°C | -4.6°C | 172 mm | 87% | 0.6 m/s | 2.3 |
| 2001 | 15.8°C | 9.5°C | 3.1°C | 23.7°C | -6.0°C | 59 mm | 74% | 0.6 m/s | 2.6 |
| 2000 | 6.3°C | 1.6°C | -3.2°C | 17.2°C | -8.9°C | 64 mm | 80% | 0.6 m/s | 2.3 |
| 1999 | 12.5°C | 6.4°C | 0.3°C | 20.4°C | -6.2°C | 61 mm | 79% | 0.6 m/s | 2.7 |
| 1998 | 14.6°C | 9.3°C | 4.0°C | 24.3°C | -4.1°C | 81 mm | 80% | 0.5 m/s | 2.1 |
| 1997 | 10.0°C | 5.4°C | 0.7°C | 16.9°C | -6.0°C | 133 mm | 87% | 0.5 m/s | 2.4 |
| 1996 | 11.6°C | 6.4°C | 1.2°C | 21.3°C | -7.5°C | 74 mm | 85% | 0.5 m/s | 2.4 |
| 1995 | 9.6°C | 4.6°C | -0.5°C | 18.6°C | -8.1°C | 83 mm | 83% | 0.5 m/s | 2.5 |
| 1994 | 12.0°C | 7.2°C | 2.4°C | 19.9°C | -4.2°C | 56 mm | 86% | 0.5 m/s | 2.2 |
| 1993 | 9.6°C | 4.8°C | 0.0°C | 18.2°C | -5.6°C | 88 mm | 84% | 0.6 m/s | 2.4 |
| 1992 | 9.3°C | 5.1°C | 0.9°C | 18.8°C | -4.6°C | 173 mm | 89% | 0.5 m/s | 1.9 |
| 1991 | 12.8°C | 7.2°C | 1.6°C | 23.3°C | -5.5°C | 102 mm | 80% | 0.6 m/s | 2.5 |
| 1990 | 13.1°C | 8.0°C | 2.9°C | 20.6°C | -6.5°C | 105 mm | 85% | 0.5 m/s | 2.1 |
| 1989 ❄️ | 6.1°C | 1.5°C | -3.1°C | 15.8°C | -14.5°C | 131 mm | 83% | 0.5 m/s | 2.4 |
| 1988 | 11.2°C | 5.2°C | -0.7°C | 19.4°C | -6.0°C | 40 mm | 81% | 0.5 m/s | 2.6 |
| 1987 | 12.7°C | 7.3°C | 1.9°C | 21.4°C | -5.1°C | 99 mm | 79% | 0.5 m/s | 2.3 |
| 1986 | 10.0°C | 5.3°C | 0.7°C | 17.0°C | -5.2°C | 93 mm | 87% | 0.5 m/s | 2 |
| 1985 | 9.1°C | 3.5°C | -2.1°C | 19.9°C | -10.6°C | 52 mm | 78% | 0.5 m/s | 2.6 |
| 1984 | 15.3°C | 9.9°C | 4.5°C | 21.9°C | -7.4°C | 77 mm | 85% | 0.5 m/s | 2.4 |
| 1983 | 8.6°C | 3.5°C | -1.7°C | 19.6°C | -16.1°C | 241 mm | 82% | 0.6 m/s | — |
| 1982 | 13.3°C | 8.5°C | 3.7°C | 22.5°C | -5.7°C | 139 mm | 89% | 0.5 m/s | — |
| 1981 | 7.8°C | 3.1°C | -1.6°C | 17.3°C | -7.6°C | 178 mm | 80% | 0.6 m/s | — |
Actual recorded December data for each year, 1981–2025 — sourced from NASA POWER.
The average high in December is around 11.9°C with lows near 1.3°C (mean 6.6°C), based on 45 years of NASA POWER data.
December averages 117 mm of rainfall in Snellville, about average for rainfall. The wettest on record was 300 mm in 2015.
The hottest December reached 24.9°C in 2007. The coldest dipped to -16.1°C in 1983.
Comparing the earliest years on record (1981–1985) with the most recent (2021–2025), average December temperatures have risen by about 2.4°C. Daytime highs moved from 10.8°C to 13.7°C and overnight lows from 0.6°C to 2.4°C over the same span.
December is one of the cooler months of the year in Snellville and about average for rainfall, so plan for around 11.9°C daytime highs and 1.3°C at night.
Not quite — December is the 2nd coolest month in Snellville, averaging 6.6°C.
For December in Snellville, pack warm layers and a jacket for chilly mornings, with typical highs of 11.9°C and lows of 1.3°C. Bring an umbrella or light rain jacket too.
Relative humidity in December averages 82% — quite humid.
Average wind speed in December is 0.5 m/s. The windiest December on record averaged 0.6 m/s (1981).
The wettest December on record was 2015 with 300 mm. On average, December sees 117 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 Snellville 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.
