December is one of the cooler months of the year in Grovetown, with average highs near 13.7°C and lows around 2.7°C (mean 8.2°C). It is about average for rainfall, averaging 104 mm of rainfall and 81% relative humidity across the period.
December is one of the cooler months of the year in Grovetown. Across 45 years of records, the warmest December in Grovetown was 2015 — when the month averaged 14.2°C — while the coldest was 1989 at 2.5°C. Typical December days reach 13.7°C with nights near 2.7°C. The long-term trend is warming, about 0.6°C per decade.
December is about average for rainfall in Grovetown, averaging 104 mm of rainfall. The wettest December on record was 1981 with 226 mm, while the driest was 1988 at 34 mm.
Relative humidity in Grovetown during December averages 81%. The most humid December was 2015 at 90%, and the least humid was 2001 at 70%.
December receives about 2.5 kWh/m²/day of solar energy in Grovetown. The sunniest December was 2004 at 2.9 kWh/m²/day, and the cloudiest was 1992 at 1.9.
Average wind speed in Grovetown during December is 1.1 m/s. The windiest Decembers were 1994, 2009 and 2019, among others at 1.2 m/s, while the calmest were 1984 and 2014 at 0.9 m/s.
Ranked against the other 11 months using 1981–2025 averages.
| Metric | 1980s | 1990s | 2000s | 2010s | 2020s | Change |
|---|---|---|---|---|---|---|
| Avg Temp | 7.0°C | 7.9°C | 7.8°C | 9.4°C | 9.1°C | +2.1°C |
| Avg High | 12.4°C | 13.3°C | 13.6°C | 14.7°C | 14.8°C | +2.4°C |
| Avg Low | 1.5°C | 2.6°C | 1.9°C | 4.0°C | 3.4°C | +1.9°C |
| Avg Rain | 106 mm | 84 mm | 99 mm | 135 mm | 88 mm | -19 mm |
December temperatures in Grovetown have risen by about 2°C between 1981–1985 and 2021–2025.
December has ranged from a record low of -13.6°C (1983) to a record high of 26.7°C (1991).
Rainfall in December is about average for rainfall, averaging 104 mm, with a wettest year of 226 mm.
A quieter season to visit Grovetown
If your dates are flexible, the more temperate months of May and September tend to be the most comfortable for visiting Grovetown. That said, December — with days averaging 13.7°C and nights around 2.7°C (mean 8.2°C) and higher rainfall (104 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 | 14.8°C | 8.8°C | 2.8°C | 25.3°C | -7.4°C | 62 mm | 74% | 1 m/s | — |
| 2024 | 14.2°C | 8.4°C | 2.5°C | 22.4°C | -4.5°C | 78 mm | 78% | 1.1 m/s | 2.6 |
| 2023 | 15.1°C | 9.4°C | 3.7°C | 20.7°C | -4.3°C | 91 mm | 77% | 1.1 m/s | 2.5 |
| 2022 | 13.1°C | 8.1°C | 3.1°C | 24.1°C | -10.1°C | 98 mm | 83% | 1.1 m/s | 2.2 |
| 2021 | 18.3°C | 12.7°C | 7.1°C | 25.8°C | -1.5°C | 118 mm | 83% | 1 m/s | 2.3 |
| 2020 | 13.3°C | 7.4°C | 1.4°C | 20.1°C | -5.8°C | 79 mm | 81% | 1.1 m/s | 2.7 |
| 2019 | 14.8°C | 9.6°C | 4.4°C | 23.7°C | -3.5°C | 212 mm | 83% | 1.2 m/s | 2.5 |
| 2018 | 13.0°C | 8.6°C | 4.1°C | 22.9°C | -3.4°C | 174 mm | 89% | 1.1 m/s | 2.2 |
| 2017 | 13.7°C | 8.4°C | 3.1°C | 23.9°C | -5.7°C | 90 mm | 79% | 1 m/s | 2.3 |
| 2016 | 15.1°C | 9.7°C | 4.3°C | 24.1°C | -5.1°C | 100 mm | 78% | 1 m/s | 2.3 |
| 2015 🔥 | 19.0°C | 14.2°C | 9.4°C | 24.4°C | -2.7°C | 224 mm | 90% | 1 m/s | 2.2 |
| 2014 | 15.2°C | 9.9°C | 4.5°C | 22.0°C | -2.3°C | 117 mm | 84% | 0.9 m/s | 2.4 |
| 2013 | 14.7°C | 9.4°C | 4.1°C | 25.0°C | -4.5°C | 198 mm | 83% | 1 m/s | 2.2 |
| 2012 | 16.2°C | 10.6°C | 5.0°C | 23.9°C | -3.4°C | 130 mm | 78% | 1.1 m/s | 2.1 |
| 2011 | 16.2°C | 10.2°C | 4.2°C | 22.9°C | -1.6°C | 69 mm | 80% | 1.1 m/s | 2.7 |
| 2010 | 8.9°C | 3.1°C | -2.7°C | 19.3°C | -6.8°C | 40 mm | 73% | 1.1 m/s | 2.7 |
| 2009 | 11.2°C | 6.3°C | 1.3°C | 22.7°C | -3.8°C | 213 mm | 87% | 1.2 m/s | 2.1 |
| 2008 | 15.3°C | 9.7°C | 4.1°C | 23.3°C | -5.2°C | 106 mm | 85% | 1.1 m/s | 2.4 |
| 2007 | 17.2°C | 11.0°C | 4.8°C | 26.4°C | -4.2°C | 161 mm | 76% | 1 m/s | 2.4 |
| 2006 | 16.6°C | 10.5°C | 4.4°C | 23.6°C | -6.7°C | 107 mm | 77% | 1.1 m/s | 2.6 |
| 2005 | 12.5°C | 6.6°C | 0.7°C | 23.0°C | -4.6°C | 95 mm | 80% | 1.1 m/s | 2.7 |
| 2004 | 12.9°C | 7.0°C | 1.2°C | 22.2°C | -7.2°C | 38 mm | 78% | 1.1 m/s | 2.9 |
| 2003 | 12.2°C | 5.8°C | -0.6°C | 19.2°C | -5.0°C | 54 mm | 75% | 1.1 m/s | 2.8 |
| 2002 | 11.9°C | 6.4°C | 1.0°C | 18.5°C | -3.7°C | 120 mm | 85% | 1.1 m/s | 2.5 |
| 2001 | 17.8°C | 11.3°C | 4.8°C | 25.6°C | -4.8°C | 38 mm | 70% | 1.1 m/s | 2.7 |
| 2000 | 8.2°C | 3.0°C | -2.3°C | 17.5°C | -7.0°C | 56 mm | 77% | 1.1 m/s | 2.3 |
| 1999 | 14.7°C | 8.2°C | 1.7°C | 22.5°C | -5.2°C | 45 mm | 76% | 1 m/s | 2.7 |
| 1998 | 16.8°C | 11.1°C | 5.4°C | 26.0°C | -4.5°C | 55 mm | 75% | 1.1 m/s | 2.3 |
| 1997 | 11.8°C | 6.7°C | 1.7°C | 18.4°C | -5.4°C | 156 mm | 87% | 1.1 m/s | 2.5 |
| 1996 | 13.1°C | 7.7°C | 2.3°C | 22.1°C | -8.1°C | 75 mm | 85% | 1.1 m/s | 2.6 |
| 1995 | 11.2°C | 5.7°C | 0.2°C | 20.5°C | -6.8°C | 85 mm | 83% | 1 m/s | 2.7 |
| 1994 | 13.4°C | 8.7°C | 4.0°C | 21.4°C | -3.6°C | 85 mm | 86% | 1.2 m/s | 2.3 |
| 1993 | 11.2°C | 6.1°C | 1.0°C | 20.3°C | -5.5°C | 78 mm | 83% | 1.1 m/s | 2.6 |
| 1992 | 10.8°C | 6.3°C | 1.8°C | 21.2°C | -4.2°C | 100 mm | 88% | 1.1 m/s | 1.9 |
| 1991 | 15.1°C | 9.2°C | 3.3°C | 26.7°C | -5.3°C | 87 mm | 73% | 1.2 m/s | 2.6 |
| 1990 | 14.8°C | 9.5°C | 4.3°C | 22.3°C | -5.3°C | 73 mm | 86% | 1.1 m/s | 2.1 |
| 1989 ❄️ | 7.3°C | 2.5°C | -2.3°C | 17.8°C | -12.2°C | 146 mm | 83% | 1.2 m/s | 2.5 |
| 1988 | 13.0°C | 6.7°C | 0.4°C | 21.0°C | -5.9°C | 34 mm | 78% | 1 m/s | 2.7 |
| 1987 | 14.9°C | 9.0°C | 3.1°C | 23.8°C | -4.7°C | 61 mm | 76% | 1.1 m/s | 2.3 |
| 1986 | 11.4°C | 6.8°C | 2.1°C | 19.6°C | -5.3°C | 87 mm | 87% | 1 m/s | 2.2 |
| 1985 | 10.5°C | 4.8°C | -0.9°C | 20.0°C | -8.4°C | 48 mm | 80% | 1 m/s | 2.8 |
| 1984 | 18.1°C | 11.8°C | 5.6°C | 24.5°C | -6.9°C | 53 mm | 79% | 0.9 m/s | 2.5 |
| 1983 | 10.6°C | 5.5°C | 0.4°C | 22.0°C | -13.6°C | 168 mm | 82% | 1.2 m/s | — |
| 1982 | 15.3°C | 10.5°C | 5.6°C | 24.5°C | -5.5°C | 133 mm | 86% | 1.1 m/s | — |
| 1981 🌧️ | 10.2°C | 5.0°C | -0.2°C | 20.9°C | -6.9°C | 226 mm | 78% | 1.1 m/s | — |
Actual recorded December data for each year, 1981–2025 — sourced from NASA POWER.
The average high in December is around 13.7°C with lows near 2.7°C (mean 8.2°C), based on 45 years of NASA POWER data.
December averages 104 mm of rainfall in Grovetown, about average for rainfall. The wettest on record was 226 mm in 1981.
The hottest December reached 26.7°C in 1991. The coldest dipped to -13.6°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°C. Daytime highs moved from 12.9°C to 15.1°C and overnight lows from 2.1°C to 3.8°C over the same span.
December is one of the cooler months of the year in Grovetown and about average for rainfall, so plan for around 13.7°C daytime highs and 2.7°C at night.
Not quite — December is the 2nd coolest month in Grovetown, averaging 8.2°C.
For December in Grovetown, pack warm layers and a jacket for chilly mornings, with typical highs of 13.7°C and lows of 2.7°C. Bring an umbrella or light rain jacket too.
Relative humidity in December averages 81% — quite humid.
Average wind speed in December is 1.1 m/s. The windiest December on record averaged 1.2 m/s (1983).
The wettest December on record was 1981 with 226 mm. On average, December sees 104 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 Grovetown 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.
