December is one of the cooler months of the year in Clarksville, with average highs near 8.7°C and lows around -1.2°C (mean 3.7°C). It is a relatively wet time of year, averaging 121 mm of rainfall and 84% relative humidity across the period.
December is one of the cooler months of the year in Clarksville. Across 45 years of records, the warmest December in Clarksville was 2021 — when the month averaged 9.9°C — while the coldest was 1983 at -2.8°C. Typical December days reach 8.7°C with nights near -1.2°C. The long-term trend is warming, about 0.7°C per decade.
December is a relatively wet time of year in Clarksville, averaging 121 mm of rainfall. The wettest December on record was 1990 with 329 mm, while the driest was 1985 at 41 mm.
Relative humidity in Clarksville during December averages 84%. The most humid Decembers were 1984 and 2002 at 90%, and the least humid was 1999 at 76%.
December receives about 1.9 kWh/m²/day of solar energy in Clarksville. The sunniest December was 1989 at 2.4 kWh/m²/day, and the cloudiest was 1984 at 1.5.
Average wind speed in Clarksville during December is 1.3 m/s. The windiest December was 2008 at 1.6 m/s, while the calmest was 1986 at 1 m/s.
Ranked against the other 11 months using 1981–2025 averages.
| Metric | 1980s | 1990s | 2000s | 2010s | 2020s | Change |
|---|---|---|---|---|---|---|
| Avg Temp | 2.2°C | 4.0°C | 3.0°C | 4.6°C | 5.6°C | +3.4°C |
| Avg High | 7.0°C | 8.9°C | 7.9°C | 9.4°C | 11.1°C | +4.1°C |
| Avg Low | -2.6°C | -1.0°C | -1.9°C | -0.2°C | 0.2°C | +2.8°C |
| Avg Rain | 129 mm | 129 mm | 118 mm | 121 mm | 99 mm | -30 mm |
December temperatures in Clarksville have risen by about 3.6°C between 1981–1985 and 2021–2025.
December has ranged from a record low of -24.3°C (1983) to a record high of 23.4°C (1998).
Rainfall in December is a relatively wet time of year, averaging 121 mm, with a wettest year of 329 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 Clarksville
If your dates are flexible, the more temperate months of September and June tend to be the most comfortable for visiting Clarksville. That said, December — with days averaging 8.7°C and nights around -1.2°C (mean 3.7°C) and higher rainfall (121 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 | 9.8°C | 4.4°C | -1.0°C | 22.5°C | -11.5°C | 43 mm | 81% | 1.3 m/s | — |
| 2024 | 10.4°C | 5.5°C | 0.6°C | 16.8°C | -6.9°C | 154 mm | 82% | 1.3 m/s | 1.9 |
| 2023 | 12.2°C | 6.4°C | 0.6°C | 20.0°C | -6.3°C | 52 mm | 77% | 1.1 m/s | 2.1 |
| 2022 | 9.0°C | 3.9°C | -1.2°C | 20.6°C | -16.2°C | 128 mm | 83% | 1.3 m/s | 1.8 |
| 2021 🔥 | 15.9°C | 9.9°C | 3.9°C | 21.5°C | -4.9°C | 118 mm | 84% | 1.4 m/s | 2.1 |
| 2020 | 9.1°C | 3.6°C | -1.9°C | 19.3°C | -8.7°C | 100 mm | 82% | 1.2 m/s | 2.1 |
| 2019 | 11.2°C | 6.4°C | 1.6°C | 19.5°C | -5.2°C | 121 mm | 88% | 1.2 m/s | 1.8 |
| 2018 | 10.0°C | 5.3°C | 0.6°C | 20.6°C | -5.8°C | 154 mm | 87% | 1.3 m/s | 1.9 |
| 2017 | 7.8°C | 2.7°C | -2.4°C | 18.3°C | -12.8°C | 106 mm | 77% | 1.2 m/s | 2.1 |
| 2016 | 8.4°C | 3.2°C | -2.0°C | 22.6°C | -20.6°C | 153 mm | 79% | 1.3 m/s | 2 |
| 2015 | 14.3°C | 9.5°C | 4.7°C | 23.2°C | -4.0°C | 141 mm | 88% | 1.3 m/s | 1.9 |
| 2014 | 8.7°C | 4.5°C | 0.4°C | 17.6°C | -5.7°C | 81 mm | 86% | 1.1 m/s | 1.6 |
| 2013 | 7.5°C | 2.8°C | -1.9°C | 20.7°C | -10.6°C | 128 mm | 85% | 1.3 m/s | 1.9 |
| 2012 | 11.6°C | 6.5°C | 1.3°C | 22.4°C | -9.2°C | 139 mm | 84% | 1.4 m/s | 1.7 |
| 2011 | 9.9°C | 4.9°C | -0.1°C | 17.6°C | -6.0°C | 151 mm | 87% | 1.1 m/s | 1.9 |
| 2010 | 4.1°C | 0.0°C | -4.1°C | 17.7°C | -14.0°C | 41 mm | 81% | 1.3 m/s | 2 |
| 2009 | 6.7°C | 2.3°C | -2.2°C | 16.9°C | -6.2°C | 96 mm | 85% | 1.3 m/s | 1.8 |
| 2008 | 7.9°C | 2.7°C | -2.4°C | 20.7°C | -10.8°C | 188 mm | 79% | 1.6 m/s | 1.9 |
| 2007 | 10.5°C | 5.7°C | 1.0°C | 21.9°C | -5.9°C | 174 mm | 86% | 1.2 m/s | 1.8 |
| 2006 | 11.0°C | 5.6°C | 0.2°C | 19.7°C | -8.2°C | 82 mm | 84% | 1.2 m/s | 2.2 |
| 2005 | 6.6°C | 1.7°C | -3.2°C | 16.2°C | -9.4°C | 60 mm | 81% | 1.2 m/s | 1.9 |
| 2004 | 7.3°C | 2.1°C | -3.1°C | 18.6°C | -20.1°C | 112 mm | 88% | 1.3 m/s | 2.2 |
| 2003 | 8.2°C | 3.1°C | -1.9°C | 14.9°C | -6.1°C | 82 mm | 82% | 1.3 m/s | 2 |
| 2002 | 6.9°C | 2.7°C | -1.5°C | 16.0°C | -13.3°C | 165 mm | 90% | 1.4 m/s | 1.8 |
| 2001 | 10.7°C | 5.9°C | 1.1°C | 20.4°C | -9.1°C | 141 mm | 86% | 1.1 m/s | 2.2 |
| 2000 | 2.7°C | -2.1°C | -7.0°C | 15.7°C | -13.6°C | 82 mm | 81% | 1.3 m/s | 1.9 |
| 1999 | 10.4°C | 4.8°C | -0.8°C | 21.5°C | -6.4°C | 99 mm | 76% | 1.3 m/s | 2 |
| 1998 | 9.8°C | 4.8°C | -0.1°C | 23.4°C | -10.1°C | 143 mm | 83% | 1.2 m/s | 1.9 |
| 1997 | 7.5°C | 3.0°C | -1.5°C | 15.7°C | -6.5°C | 69 mm | 85% | 1.1 m/s | 1.9 |
| 1996 | 9.2°C | 4.2°C | -0.8°C | 20.0°C | -13.0°C | 126 mm | 89% | 1.3 m/s | 1.9 |
| 1995 | 7.3°C | 2.5°C | -2.4°C | 19.2°C | -13.1°C | 58 mm | 82% | 1.2 m/s | 1.9 |
| 1994 | 10.7°C | 5.6°C | 0.6°C | 18.5°C | -5.5°C | 87 mm | 88% | 1.1 m/s | 1.7 |
| 1993 | 7.4°C | 3.2°C | -1.0°C | 14.6°C | -12.1°C | 135 mm | 86% | 1.2 m/s | 1.8 |
| 1992 | 8.0°C | 3.1°C | -1.9°C | 17.3°C | -8.4°C | 71 mm | 85% | 1.2 m/s | 1.6 |
| 1991 | 9.1°C | 4.4°C | -0.3°C | 16.0°C | -8.1°C | 173 mm | 87% | 1.2 m/s | 1.8 |
| 1990 🌧️ | 9.9°C | 4.3°C | -1.4°C | 17.9°C | -14.9°C | 329 mm | 87% | 1.3 m/s | 1.8 |
| 1989 | 2.2°C | -2.7°C | -7.6°C | 14.0°C | -22.5°C | 61 mm | 79% | 1.3 m/s | 2.4 |
| 1988 | 8.3°C | 3.0°C | -2.4°C | 16.2°C | -10.9°C | 141 mm | 83% | 1.4 m/s | 2.2 |
| 1987 | 9.9°C | 4.6°C | -0.7°C | 16.1°C | -5.5°C | 212 mm | 83% | 1.5 m/s | 1.7 |
| 1986 | 7.1°C | 2.6°C | -1.8°C | 17.0°C | -6.0°C | 99 mm | 87% | 1 m/s | 1.8 |
| 1985 | 4.5°C | -0.6°C | -5.7°C | 17.3°C | -14.7°C | 41 mm | 82% | 1.4 m/s | 2.3 |
| 1984 | 11.8°C | 7.5°C | 3.3°C | 20.8°C | -11.7°C | 134 mm | 90% | 1.4 m/s | 1.5 |
| 1983 ❄️ | 1.8°C | -2.8°C | -7.3°C | 15.7°C | -24.3°C | 174 mm | 89% | 1.4 m/s | — |
| 1982 | 11.1°C | 6.7°C | 2.3°C | 21.7°C | -7.5°C | 227 mm | 88% | 1.5 m/s | — |
| 1981 | 5.9°C | 1.2°C | -3.5°C | 15.9°C | -12.6°C | 78 mm | 81% | 1.3 m/s | — |
Actual recorded December data for each year, 1981–2025 — sourced from NASA POWER.
The average high in December is around 8.7°C with lows near -1.2°C (mean 3.7°C), based on 45 years of NASA POWER data.
December averages 121 mm of rainfall in Clarksville, a relatively wet time of year. The wettest on record was 329 mm in 1990.
The hottest December reached 23.4°C in 1998. The coldest dipped to -24.3°C in 1983.
Comparing the earliest years on record (1981–1985) with the most recent (2021–2025), average December temperatures have risen by about 3.6°C. Daytime highs moved from 7°C to 11.5°C and overnight lows from -2.2°C to 0.6°C over the same span.
December is one of the cooler months of the year in Clarksville and a relatively wet time of year, so plan for around 8.7°C daytime highs and -1.2°C at night.
Not quite — December is the 2nd coolest month in Clarksville, averaging 3.7°C.
For December in Clarksville, pack warm layers and a jacket for chilly mornings, with typical highs of 8.7°C and lows of -1.2°C. Bring an umbrella or light rain jacket too.
Relative humidity in December averages 84% — quite humid.
Average wind speed in December is 1.3 m/s. The windiest December on record averaged 1.6 m/s (2008).
The wettest December on record was 1990 with 329 mm. On average, December sees 121 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 Clarksville 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.
