December is one of the cooler months of the year in Jackson, with average highs near 10°C and lows around -0.2°C (mean 4.9°C). It is a relatively wet time of year, averaging 135 mm of rainfall and 84% relative humidity across the period.
December is one of the cooler months of the year in Jackson. Across 45 years of records, the warmest December in Jackson was 2021 — when the month averaged 11.5°C — while the coldest was 1983 at -1.9°C. Typical December days reach 10°C with nights near -0.2°C. The long-term trend is warming, about 0.8°C per decade.
December is a relatively wet time of year in Jackson, averaging 135 mm of rainfall. The wettest December on record was 1990 with 317 mm, while the driest was 2025 at 44 mm.
Relative humidity in Jackson during December averages 84%. The most humid December was 1984 at 90%, and the least humid was 2023 at 74%.
December receives about 2 kWh/m²/day of solar energy in Jackson. The sunniest December was 1985 at 2.5 kWh/m²/day, and the cloudiest was 1992 at 1.6.
Average wind speed in Jackson during December is 1.8 m/s. The windiest December was 2008 at 2.3 m/s, while the calmest was 1986 at 1.4 m/s.
Ranked against the other 11 months using 1981–2025 averages.
| Metric | 1980s | 1990s | 2000s | 2010s | 2020s | Change |
|---|---|---|---|---|---|---|
| Avg Temp | 3.3°C | 5.2°C | 4.1°C | 5.8°C | 6.9°C | +3.6°C |
| Avg High | 8.2°C | 10.3°C | 9.2°C | 10.8°C | 12.4°C | +4.2°C |
| Avg Low | -1.7°C | 0.0°C | -1.0°C | 0.8°C | 1.3°C | +3°C |
| Avg Rain | 145 mm | 144 mm | 131 mm | 135 mm | 113 mm | -31 mm |
December temperatures in Jackson have risen by about 3.8°C between 1981–1985 and 2021–2025.
December has ranged from a record low of -25.2°C (1983) to a record high of 24.7°C (1998).
Rainfall in December is a relatively wet time of year, averaging 135 mm, with a wettest year of 317 mm.
A quieter season to visit Jackson
If your dates are flexible, the more temperate months of September and June tend to be the most comfortable for visiting Jackson. That said, December — with days averaging 10°C and nights around -0.2°C (mean 4.9°C) and higher rainfall (135 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 | 11.0°C | 5.5°C | 0.0°C | 22.9°C | -9.1°C | 44 mm | 81% | 1.8 m/s | — |
| 2024 | 11.8°C | 6.7°C | 1.5°C | 18.1°C | -6.6°C | 164 mm | 82% | 1.8 m/s | 2.1 |
| 2023 | 13.7°C | 7.6°C | 1.4°C | 22.0°C | -5.7°C | 56 mm | 74% | 1.6 m/s | 2.3 |
| 2022 | 10.3°C | 5.3°C | 0.3°C | 23.2°C | -15.6°C | 158 mm | 85% | 1.7 m/s | 1.8 |
| 2021 🔥 | 17.4°C | 11.5°C | 5.7°C | 23.2°C | -4.5°C | 114 mm | 84% | 2 m/s | 2 |
| 2020 | 10.2°C | 4.6°C | -1.1°C | 20.2°C | -7.5°C | 145 mm | 83% | 1.7 m/s | 2.3 |
| 2019 | 12.5°C | 7.5°C | 2.5°C | 19.6°C | -4.7°C | 130 mm | 88% | 1.6 m/s | 1.9 |
| 2018 | 10.4°C | 5.8°C | 1.2°C | 21.7°C | -8.4°C | 167 mm | 88% | 1.8 m/s | 1.8 |
| 2017 | 9.6°C | 4.4°C | -0.8°C | 19.9°C | -11.3°C | 145 mm | 76% | 1.7 m/s | 2.1 |
| 2016 | 10.3°C | 4.8°C | -0.7°C | 23.3°C | -15.3°C | 158 mm | 79% | 1.9 m/s | 2.1 |
| 2015 | 15.3°C | 10.4°C | 5.4°C | 24.4°C | -3.5°C | 160 mm | 87% | 1.9 m/s | 2.1 |
| 2014 | 10.1°C | 5.7°C | 1.3°C | 18.1°C | -4.6°C | 101 mm | 87% | 1.5 m/s | 1.7 |
| 2013 | 9.0°C | 4.1°C | -0.9°C | 22.0°C | -9.3°C | 128 mm | 84% | 1.7 m/s | 2 |
| 2012 | 12.9°C | 7.6°C | 2.2°C | 22.3°C | -6.9°C | 132 mm | 84% | 1.9 m/s | 1.8 |
| 2011 | 10.9°C | 5.8°C | 0.7°C | 17.7°C | -5.1°C | 185 mm | 87% | 1.6 m/s | 2 |
| 2010 | 6.5°C | 1.8°C | -2.9°C | 18.4°C | -12.3°C | 47 mm | 79% | 1.9 m/s | 2.1 |
| 2009 | 7.5°C | 3.1°C | -1.4°C | 17.4°C | -6.3°C | 132 mm | 86% | 1.8 m/s | 2 |
| 2008 | 9.3°C | 4.0°C | -1.3°C | 21.8°C | -9.9°C | 222 mm | 79% | 2.3 m/s | 2 |
| 2007 | 12.3°C | 7.2°C | 2.0°C | 22.9°C | -5.1°C | 139 mm | 85% | 1.7 m/s | 2.1 |
| 2006 | 12.0°C | 6.5°C | 1.0°C | 20.3°C | -7.8°C | 105 mm | 83% | 1.7 m/s | 2.4 |
| 2005 | 8.5°C | 3.0°C | -2.5°C | 18.6°C | -8.0°C | 63 mm | 79% | 1.7 m/s | 2.2 |
| 2004 | 8.2°C | 3.0°C | -2.2°C | 19.2°C | -18.0°C | 132 mm | 88% | 1.8 m/s | 2.4 |
| 2003 | 9.8°C | 4.1°C | -1.6°C | 16.5°C | -5.1°C | 87 mm | 82% | 1.9 m/s | 2.2 |
| 2002 | 8.5°C | 4.3°C | 0.0°C | 17.1°C | -8.4°C | 195 mm | 90% | 1.9 m/s | 2 |
| 2001 | 11.6°C | 6.8°C | 2.0°C | 20.7°C | -7.8°C | 168 mm | 88% | 1.6 m/s | 2.2 |
| 2000 | 4.3°C | -1.0°C | -6.2°C | 16.5°C | -13.0°C | 69 mm | 80% | 1.8 m/s | 2 |
| 1999 | 11.4°C | 5.6°C | -0.3°C | 21.5°C | -5.9°C | 105 mm | 78% | 1.8 m/s | 2.2 |
| 1998 | 10.9°C | 5.8°C | 0.7°C | 24.7°C | -8.4°C | 153 mm | 83% | 1.8 m/s | 2 |
| 1997 | 8.5°C | 3.8°C | -0.9°C | 16.5°C | -6.0°C | 91 mm | 85% | 1.6 m/s | 1.9 |
| 1996 | 10.4°C | 5.5°C | 0.5°C | 20.6°C | -11.2°C | 126 mm | 89% | 1.9 m/s | 2.1 |
| 1995 | 8.7°C | 3.8°C | -1.1°C | 20.3°C | -9.8°C | 96 mm | 82% | 1.8 m/s | 2 |
| 1994 | 11.8°C | 6.7°C | 1.5°C | 19.1°C | -5.1°C | 111 mm | 88% | 1.5 m/s | 1.9 |
| 1993 | 9.2°C | 4.6°C | -0.1°C | 16.0°C | -8.9°C | 159 mm | 86% | 1.7 m/s | 2 |
| 1992 | 9.6°C | 4.4°C | -0.8°C | 19.0°C | -7.0°C | 85 mm | 86% | 1.6 m/s | 1.6 |
| 1991 | 10.4°C | 5.7°C | 0.9°C | 18.1°C | -6.2°C | 202 mm | 88% | 1.7 m/s | 2 |
| 1990 🌧️ | 11.7°C | 5.8°C | -0.2°C | 19.3°C | -10.9°C | 317 mm | 86% | 1.9 m/s | 1.8 |
| 1989 | 3.7°C | -1.5°C | -6.6°C | 16.6°C | -20.4°C | 66 mm | 79% | 1.9 m/s | 2.3 |
| 1988 | 9.6°C | 4.2°C | -1.2°C | 17.9°C | -9.2°C | 162 mm | 84% | 1.9 m/s | 2.4 |
| 1987 | 11.2°C | 5.9°C | 0.6°C | 18.0°C | -5.7°C | 259 mm | 84% | 2 m/s | 1.8 |
| 1986 | 8.0°C | 3.5°C | -1.0°C | 17.2°C | -5.1°C | 110 mm | 87% | 1.4 m/s | 1.9 |
| 1985 | 6.0°C | 0.5°C | -4.9°C | 19.0°C | -13.5°C | 46 mm | 81% | 1.9 m/s | 2.5 |
| 1984 | 13.5°C | 9.0°C | 4.4°C | 21.2°C | -8.5°C | 93 mm | 90% | 1.9 m/s | 1.8 |
| 1983 ❄️ | 2.8°C | -1.9°C | -6.7°C | 18.0°C | -25.2°C | 198 mm | 90% | 1.9 m/s | — |
| 1982 | 11.5°C | 7.3°C | 3.1°C | 22.2°C | -7.3°C | 311 mm | 89% | 2.1 m/s | — |
| 1981 | 7.8°C | 2.4°C | -3.0°C | 18.1°C | -12.9°C | 56 mm | 79% | 1.9 m/s | — |
Actual recorded December data for each year, 1981–2025 — sourced from NASA POWER.
The average high in December is around 10°C with lows near -0.2°C (mean 4.9°C), based on 45 years of NASA POWER data.
December averages 135 mm of rainfall in Jackson, a relatively wet time of year. The wettest on record was 317 mm in 1990.
The hottest December reached 24.7°C in 1998. The coldest dipped to -25.2°C in 1983.
Comparing the earliest years on record (1981–1985) with the most recent (2021–2025), average December temperatures have risen by about 3.8°C. Daytime highs moved from 8.3°C to 12.8°C and overnight lows from -1.4°C to 1.8°C over the same span.
December is one of the cooler months of the year in Jackson and a relatively wet time of year, so plan for around 10°C daytime highs and -0.2°C at night.
Not quite — December is the 2nd coolest month in Jackson, averaging 4.9°C.
For December in Jackson, pack warm layers and a jacket for chilly mornings, with typical highs of 10°C and lows of -0.2°C. Bring an umbrella or light rain jacket too.
Relative humidity in December averages 84% — quite humid.
Average wind speed in December is 1.8 m/s. The windiest December on record averaged 2.3 m/s (2008).
The wettest December on record was 1990 with 317 mm. On average, December sees 135 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 Jackson 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.
