December is one of the cooler months of the year in Stillwater, with average highs near 9.5°C and lows around -1.6°C (mean 4°C). It is one of the drier months, averaging 48 mm of rainfall and 75% relative humidity across the period.
December is one of the cooler months of the year in Stillwater. Across 45 years of records, the warmest December in Stillwater was 2021 — when the month averaged 10.3°C — while the coldest was 1983 at -3.8°C. Typical December days reach 9.5°C with nights near -1.6°C. The long-term trend is warming, about 0.9°C per decade.
December is one of the drier months in Stillwater, averaging 48 mm of rainfall. The wettest December on record was 1984 with 196 mm, while the driest was 2025 at 1 mm.
Relative humidity in Stillwater during December averages 75%. The most humid December was 1986 at 86%, and the least humid was 2012 at 61%.
December receives about 2.3 kWh/m²/day of solar energy in Stillwater. The sunniest Decembers were 2004 and 2021 at 2.7 kWh/m²/day, and the cloudiest were 1984 and 2014 at 1.7.
Average wind speed in Stillwater during December is 3.2 m/s. The windiest December was 2008 at 4.1 m/s, while the calmest was 1986 at 2.3 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 | 3.3°C | 4.6°C | 6.8°C | +4.6°C |
| Avg High | 7.5°C | 9.3°C | 8.8°C | 10.1°C | 12.9°C | +5.4°C |
| Avg Low | -3.1°C | -1.4°C | -2.3°C | -0.9°C | 0.6°C | +3.7°C |
| Avg Rain | 55 mm | 64 mm | 40 mm | 39 mm | 38 mm | -17 mm |
December temperatures in Stillwater have risen by about 5.3°C between 1981–1985 and 2021–2025.
December has ranged from a record low of -22.6°C (1989) to a record high of 25.5°C (2012).
Rainfall in December is one of the drier months, averaging 48 mm, with a wettest year of 196 mm.
Daytime highs and overnight lows have shifted differently — highs rose about 1.1°C per decade while lows rose 0.7°C per decade, widening the gap between day and night.
A quieter season to visit Stillwater
If your dates are flexible, the more temperate months of September and May tend to be the most comfortable for visiting Stillwater. That said, December — with days averaging 9.5°C and nights around -1.6°C (mean 4°C) and moderate rainfall (48 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 | 13.1°C | 6.8°C | 0.5°C | 25.3°C | -7.7°C | 1 mm | 71% | 3.3 m/s | — |
| 2024 | 12.9°C | 7.3°C | 1.7°C | 20.5°C | -4.7°C | 22 mm | 76% | 3 m/s | 2.5 |
| 2023 | 13.1°C | 7.1°C | 1.0°C | 20.2°C | -4.4°C | 67 mm | 72% | 3.3 m/s | 2.2 |
| 2022 | 10.0°C | 4.5°C | -1.1°C | 19.5°C | -15.5°C | 53 mm | 69% | 3.5 m/s | 2.2 |
| 2021 🔥 | 17.2°C | 10.3°C | 3.4°C | 25.2°C | -6.4°C | 11 mm | 64% | 3.3 m/s | 2.7 |
| 2020 | 10.8°C | 4.6°C | -1.6°C | 20.2°C | -6.7°C | 73 mm | 74% | 3.1 m/s | 2.4 |
| 2019 | 11.3°C | 5.7°C | 0.1°C | 18.9°C | -5.0°C | 19 mm | 79% | 3.1 m/s | 2.4 |
| 2018 | 10.1°C | 4.7°C | -0.7°C | 16.5°C | -5.8°C | 84 mm | 77% | 3.2 m/s | 2.3 |
| 2017 | 9.8°C | 4.4°C | -1.1°C | 23.6°C | -11.9°C | 16 mm | 68% | 3.1 m/s | 2.4 |
| 2016 | 9.3°C | 3.6°C | -2.1°C | 22.9°C | -12.7°C | 11 mm | 64% | 3.2 m/s | 2.3 |
| 2015 | 12.1°C | 6.1°C | 0.2°C | 20.4°C | -10.4°C | 121 mm | 82% | 3.4 m/s | 2.3 |
| 2014 | 9.4°C | 5.2°C | 1.1°C | 18.4°C | -7.3°C | 26 mm | 77% | 3 m/s | 1.7 |
| 2013 | 6.6°C | 1.1°C | -4.4°C | 18.5°C | -13.3°C | 35 mm | 78% | 3 m/s | 2.3 |
| 2012 | 12.0°C | 6.2°C | 0.4°C | 25.5°C | -7.4°C | 18 mm | 61% | 3.5 m/s | 2.4 |
| 2011 | 10.4°C | 4.8°C | -0.8°C | 19.3°C | -6.1°C | 48 mm | 75% | 2.9 m/s | 2.1 |
| 2010 | 9.8°C | 3.8°C | -2.2°C | 20.7°C | -6.7°C | 11 mm | 68% | 3.1 m/s | 2.4 |
| 2009 | 5.8°C | 0.7°C | -4.4°C | 13.9°C | -9.1°C | 30 mm | 79% | 3.4 m/s | 2.2 |
| 2008 | 8.9°C | 2.8°C | -3.2°C | 23.2°C | -12.0°C | 28 mm | 67% | 4.1 m/s | 2.3 |
| 2007 | 7.3°C | 2.2°C | -2.8°C | 18.0°C | -7.6°C | 69 mm | 83% | 3 m/s | 2 |
| 2006 | 11.2°C | 5.4°C | -0.4°C | 21.1°C | -10.0°C | 72 mm | 73% | 3.5 m/s | 2.4 |
| 2005 | 9.4°C | 3.5°C | -2.5°C | 20.1°C | -13.6°C | 5 mm | 64% | 3.2 m/s | 2.5 |
| 2004 | 10.7°C | 4.8°C | -1.1°C | 20.7°C | -12.8°C | 21 mm | 76% | 3.3 m/s | 2.7 |
| 2003 | 11.0°C | 5.0°C | -1.1°C | 17.3°C | -5.5°C | 35 mm | 71% | 3.9 m/s | 2.4 |
| 2002 | 9.2°C | 3.8°C | -1.6°C | 17.9°C | -11.9°C | 65 mm | 80% | 3.1 m/s | 2.2 |
| 2001 | 11.8°C | 6.2°C | 0.5°C | 24.1°C | -6.8°C | 32 mm | 69% | 3.2 m/s | 2.6 |
| 2000 | 3.1°C | -1.6°C | -6.3°C | 15.0°C | -12.5°C | 41 mm | 80% | 3.1 m/s | 2.4 |
| 1999 | 12.0°C | 5.6°C | -0.8°C | 19.6°C | -5.5°C | 99 mm | 74% | 3.4 m/s | 2.5 |
| 1998 | 9.9°C | 4.4°C | -1.1°C | 22.4°C | -10.9°C | 42 mm | 78% | 2.9 m/s | 2.5 |
| 1997 | 7.1°C | 2.2°C | -2.7°C | 17.2°C | -10.8°C | 101 mm | 83% | 3 m/s | 2.3 |
| 1996 | 9.7°C | 3.7°C | -2.3°C | 20.8°C | -13.1°C | 2 mm | 79% | 3.3 m/s | 2.6 |
| 1995 | 8.8°C | 3.5°C | -1.7°C | 21.6°C | -9.5°C | 56 mm | 76% | 2.8 m/s | 2.3 |
| 1994 | 10.4°C | 5.3°C | 0.2°C | 19.9°C | -6.0°C | 28 mm | 85% | 2.5 m/s | 1.8 |
| 1993 | 10.3°C | 4.7°C | -0.8°C | 18.0°C | -5.8°C | 47 mm | 75% | 3.2 m/s | 2.3 |
| 1992 | 8.0°C | 3.3°C | -1.5°C | 20.0°C | -7.1°C | 96 mm | 85% | 3.1 m/s | 1.9 |
| 1991 | 9.4°C | 4.9°C | 0.4°C | 18.3°C | -5.5°C | 129 mm | 83% | 2.8 m/s | 2.1 |
| 1990 | 7.6°C | 1.9°C | -3.7°C | 17.4°C | -14.8°C | 43 mm | 74% | 3.3 m/s | 2.3 |
| 1989 | 4.4°C | -1.2°C | -6.8°C | 17.8°C | -22.6°C | 9 mm | 68% | 3.1 m/s | 2.6 |
| 1988 | 11.4°C | 5.0°C | -1.4°C | 18.0°C | -6.5°C | 38 mm | 70% | 3.2 m/s | 2.5 |
| 1987 | 8.3°C | 2.8°C | -2.7°C | 17.8°C | -13.4°C | 108 mm | 82% | 3.3 m/s | 2 |
| 1986 | 8.5°C | 3.6°C | -1.2°C | 11.4°C | -5.0°C | 31 mm | 86% | 2.3 m/s | 2.2 |
| 1985 | 5.4°C | 0.2°C | -5.0°C | 17.5°C | -12.0°C | 13 mm | 80% | 3 m/s | 2.5 |
| 1984 🌧️ | 10.4°C | 5.2°C | 0.0°C | 21.7°C | -9.4°C | 196 mm | 82% | 3.6 m/s | 1.7 |
| 1983 ❄️ | 1.0°C | -3.8°C | -8.6°C | 13.7°C | -18.7°C | 16 mm | 78% | 3.4 m/s | — |
| 1982 | 10.0°C | 4.8°C | -0.4°C | 19.9°C | -7.8°C | 78 mm | 75% | 3.2 m/s | — |
| 1981 | 7.9°C | 3.1°C | -1.7°C | 18.5°C | -9.4°C | 5 mm | 77% | 3.1 m/s | — |
Actual recorded December data for each year, 1981–2025 — sourced from NASA POWER.
The average high in December is around 9.5°C with lows near -1.6°C (mean 4°C), based on 45 years of NASA POWER data.
December averages 48 mm of rainfall in Stillwater, one of the drier months. The wettest on record was 196 mm in 1984.
The hottest December reached 25.5°C in 2012. The coldest dipped to -22.6°C in 1989.
Comparing the earliest years on record (1981–1985) with the most recent (2021–2025), average December temperatures have risen by about 5.3°C. Daytime highs moved from 6.9°C to 13.3°C and overnight lows from -3.1°C to 1.1°C over the same span.
December is one of the cooler months of the year in Stillwater and one of the drier months, so plan for around 9.5°C daytime highs and -1.6°C at night.
Not quite — December is the 2nd coolest month in Stillwater, averaging 4°C.
For December in Stillwater, pack warm layers and a jacket for chilly mornings, with typical highs of 9.5°C and lows of -1.6°C.
Relative humidity in December averages 75% — quite humid.
Average wind speed in December is 3.2 m/s. The windiest December on record averaged 4.1 m/s (2008).
The wettest December on record was 1984 with 196 mm. On average, December sees 48 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 Stillwater 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.
