December is one of the cooler months of the year in Maryville, with average highs near 8.5°C and lows around -1.3°C (mean 3.6°C). It is a relatively wet time of year, averaging 127 mm of rainfall and 83% relative humidity across the period.
December is one of the cooler months of the year in Maryville. Across 45 years of records, the warmest December in Maryville was 2015 — when the month averaged 9.9°C — while the coldest was 1989 at -2.5°C. Typical December days reach 8.5°C with nights near -1.3°C. The long-term trend is warming, about 0.7°C per decade.
December is a relatively wet time of year in Maryville, averaging 127 mm of rainfall. The wettest December on record was 2015 with 265 mm, while the driest was 2025 at 50 mm.
Relative humidity in Maryville during December averages 83%. The most humid December was 1982 at 88%, and the least humid was 1999 at 75%.
December receives about 2.1 kWh/m²/day of solar energy in Maryville. The sunniest December was 2006 at 2.6 kWh/m²/day, and the cloudiest was 1992 at 1.7.
Average wind speed in Maryville during December is 0.4 m/s. The windiest Decembers were 2005, 2019 and 2021, among others at 0.5 m/s, while the calmest were 2023, 2024 and 2025, among others at 0.4 m/s.
Ranked against the other 11 months using 1981–2025 averages.
| Metric | 1980s | 1990s | 2000s | 2010s | 2020s | Change |
|---|---|---|---|---|---|---|
| Avg Temp | 2.3°C | 3.6°C | 3.0°C | 4.7°C | 5.1°C | +2.8°C |
| Avg High | 7.2°C | 8.5°C | 8.0°C | 9.3°C | 10.4°C | +3.2°C |
| Avg Low | -2.6°C | -1.3°C | -2.0°C | 0.0°C | -0.1°C | +2.5°C |
| Avg Rain | 113 mm | 132 mm | 119 mm | 151 mm | 115 mm | +2 mm |
December temperatures in Maryville have risen by about 3°C between 1981–1985 and 2021–2025.
December has ranged from a record low of -20.8°C (1983) to a record high of 22.3°C (2001).
Rainfall in December is a relatively wet time of year, averaging 127 mm, with a wettest year of 265 mm.
A quieter season to visit Maryville
If your dates are flexible, the more temperate months of August and June tend to be the most comfortable for visiting Maryville. That said, December — with days averaging 8.5°C and nights around -1.3°C (mean 3.6°C) and higher rainfall (127 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 | 9.7°C | 4.3°C | -1.1°C | 20.0°C | -10.8°C | 50 mm | 77% | 0.4 m/s | — |
| 2024 | 9.9°C | 4.8°C | -0.3°C | 19.2°C | -8.0°C | 121 mm | 79% | 0.4 m/s | 2.2 |
| 2023 | 11.0°C | 5.6°C | 0.2°C | 16.6°C | -7.1°C | 161 mm | 78% | 0.4 m/s | 2.3 |
| 2022 | 9.0°C | 4.2°C | -0.7°C | 18.4°C | -17.9°C | 147 mm | 84% | 0.4 m/s | 2.1 |
| 2021 | 14.5°C | 8.9°C | 3.3°C | 19.6°C | -5.2°C | 100 mm | 82% | 0.5 m/s | 2.1 |
| 2020 | 8.2°C | 3.1°C | -2.1°C | 15.8°C | -10.9°C | 111 mm | 82% | 0.4 m/s | 2.3 |
| 2019 | 11.3°C | 6.2°C | 1.1°C | 21.0°C | -6.2°C | 140 mm | 83% | 0.5 m/s | 2.3 |
| 2018 | 8.2°C | 4.2°C | 0.2°C | 17.4°C | -7.0°C | 207 mm | 87% | 0.4 m/s | 1.9 |
| 2017 | 8.0°C | 3.3°C | -1.4°C | 16.6°C | -12.4°C | 85 mm | 79% | 0.4 m/s | 2.1 |
| 2016 | 9.0°C | 4.0°C | -1.1°C | 20.1°C | -7.6°C | 147 mm | 80% | 0.4 m/s | 2.1 |
| 2015 🔥 🌧️ | 14.4°C | 9.9°C | 5.5°C | 20.6°C | -5.9°C | 265 mm | 88% | 0.4 m/s | 2 |
| 2014 | 9.9°C | 5.2°C | 0.4°C | 17.3°C | -5.5°C | 97 mm | 85% | 0.4 m/s | 1.9 |
| 2013 | 8.8°C | 4.4°C | -0.1°C | 20.2°C | -6.5°C | 215 mm | 85% | 0.4 m/s | 2.1 |
| 2012 | 10.7°C | 5.9°C | 1.0°C | 19.7°C | -7.5°C | 154 mm | 83% | 0.4 m/s | 1.9 |
| 2011 | 10.9°C | 5.7°C | 0.5°C | 16.8°C | -5.7°C | 141 mm | 85% | 0.4 m/s | 2.2 |
| 2010 | 2.0°C | -2.2°C | -6.4°C | 10.6°C | -12.6°C | 54 mm | 82% | 0.4 m/s | 2.1 |
| 2009 | 5.7°C | 1.2°C | -3.3°C | 13.7°C | -9.0°C | 182 mm | 86% | 0.4 m/s | 2.1 |
| 2008 | 9.4°C | 4.4°C | -0.6°C | 16.0°C | -12.7°C | 189 mm | 82% | 0.4 m/s | 1.9 |
| 2007 | 11.6°C | 6.4°C | 1.1°C | 21.4°C | -6.7°C | 102 mm | 81% | 0.4 m/s | 2 |
| 2006 | 11.6°C | 5.7°C | -0.2°C | 18.7°C | -9.5°C | 78 mm | 79% | 0.4 m/s | 2.6 |
| 2005 | 5.3°C | 0.7°C | -4.0°C | 11.9°C | -9.1°C | 101 mm | 83% | 0.5 m/s | 2.2 |
| 2004 | 8.1°C | 2.8°C | -2.5°C | 18.4°C | -14.2°C | 131 mm | 81% | 0.5 m/s | 2.4 |
| 2003 | 6.6°C | 1.6°C | -3.4°C | 12.8°C | -7.8°C | 96 mm | 81% | 0.4 m/s | 2.3 |
| 2002 | 6.2°C | 2.0°C | -2.2°C | 12.4°C | -9.3°C | 148 mm | 88% | 0.4 m/s | 2.2 |
| 2001 | 11.1°C | 5.9°C | 0.7°C | 22.3°C | -9.7°C | 100 mm | 77% | 0.4 m/s | 2.5 |
| 2000 | 3.9°C | -1.1°C | -6.1°C | 14.4°C | -13.1°C | 59 mm | 80% | 0.4 m/s | 2.3 |
| 1999 | 9.7°C | 4.1°C | -1.5°C | 17.0°C | -8.6°C | 53 mm | 75% | 0.4 m/s | 2.4 |
| 1998 | 10.3°C | 5.2°C | 0.1°C | 20.8°C | -12.1°C | 165 mm | 84% | 0.4 m/s | 2 |
| 1997 | 6.6°C | 2.2°C | -2.2°C | 13.4°C | -11.2°C | 85 mm | 85% | 0.4 m/s | 2 |
| 1996 | 9.1°C | 4.0°C | -1.1°C | 18.6°C | -12.3°C | 118 mm | 84% | 0.4 m/s | 2.1 |
| 1995 | 5.7°C | 0.7°C | -4.3°C | 17.1°C | -18.2°C | 76 mm | 83% | 0.4 m/s | 2.3 |
| 1994 | 10.7°C | 5.4°C | 0.2°C | 17.0°C | -6.2°C | 62 mm | 84% | 0.4 m/s | 2.1 |
| 1993 | 6.1°C | 1.6°C | -2.9°C | 14.2°C | -12.4°C | 164 mm | 85% | 0.4 m/s | 2.1 |
| 1992 | 6.8°C | 2.6°C | -1.7°C | 16.6°C | -6.4°C | 183 mm | 87% | 0.4 m/s | 1.7 |
| 1991 | 9.5°C | 4.6°C | -0.4°C | 19.5°C | -7.0°C | 190 mm | 84% | 0.4 m/s | 2.2 |
| 1990 | 10.0°C | 5.4°C | 0.7°C | 18.5°C | -8.7°C | 222 mm | 84% | 0.5 m/s | 1.9 |
| 1989 ❄️ | 2.2°C | -2.5°C | -7.2°C | 12.7°C | -19.8°C | 114 mm | 84% | 0.4 m/s | 2.1 |
| 1988 | 7.6°C | 2.4°C | -2.7°C | 14.9°C | -9.4°C | 92 mm | 79% | 0.5 m/s | 2.3 |
| 1987 | 9.7°C | 4.5°C | -0.7°C | 18.7°C | -6.7°C | 104 mm | 79% | 0.4 m/s | 1.9 |
| 1986 | 7.8°C | 3.1°C | -1.6°C | 16.1°C | -7.6°C | 117 mm | 85% | 0.4 m/s | 1.9 |
| 1985 | 5.1°C | 0.0°C | -5.2°C | 15.4°C | -14.9°C | 51 mm | 78% | 0.4 m/s | 2.3 |
| 1984 | 12.9°C | 7.7°C | 2.5°C | 19.3°C | -12.7°C | 69 mm | 87% | 0.4 m/s | 2.1 |
| 1983 | 5.6°C | 0.4°C | -4.8°C | 16.8°C | -20.8°C | 195 mm | 82% | 0.5 m/s | — |
| 1982 | 10.0°C | 5.7°C | 1.5°C | 19.9°C | -10.1°C | 154 mm | 88% | 0.4 m/s | — |
| 1981 | 3.5°C | -0.8°C | -5.0°C | 14.1°C | -14.6°C | 126 mm | 84% | 0.4 m/s | — |
Actual recorded December data for each year, 1981–2025 — sourced from NASA POWER.
The average high in December is around 8.5°C with lows near -1.3°C (mean 3.6°C), based on 45 years of NASA POWER data.
December averages 127 mm of rainfall in Maryville, a relatively wet time of year. The wettest on record was 265 mm in 2015.
The hottest December reached 22.3°C in 2001. The coldest dipped to -20.8°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°C. Daytime highs moved from 7.4°C to 10.8°C and overnight lows from -2.2°C to 0.3°C over the same span.
December is one of the cooler months of the year in Maryville and a relatively wet time of year, so plan for around 8.5°C daytime highs and -1.3°C at night.
Not quite — December is the 2nd coolest month in Maryville, averaging 3.6°C.
For December in Maryville, pack warm layers and a jacket for chilly mornings, with typical highs of 8.5°C and lows of -1.3°C. Bring an umbrella or light rain jacket too.
Relative humidity in December averages 83% — quite humid.
Average wind speed in December is 0.4 m/s. The windiest December on record averaged 0.5 m/s (1983).
The wettest December on record was 2015 with 265 mm. On average, December sees 127 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 Maryville 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.
