December is one of the cooler months of the year in Bonney Lake, with average highs near 1.2°C and lows around -4°C (mean -1.4°C). It is a relatively wet time of year, averaging 236 mm of rainfall and 95% relative humidity across the period.
December is one of the cooler months of the year in Bonney Lake. Across 45 years of records, the warmest December in Bonney Lake was 2023 — when the month averaged 2.2°C — while the coldest was 1983 at -6.4°C. Typical December days reach 1.2°C with nights near -4°C. The long-term trend is warming, about 0.6°C per decade.
December is a relatively wet time of year in Bonney Lake, averaging 236 mm of rainfall. The wettest December on record was 1996 with 450 mm, while the driest was 1985 at 60 mm.
Relative humidity in Bonney Lake during December averages 95%. The most humid December was 2012 at 99%, and the least humid was 2009 at 85%.
December receives about 0.9 kWh/m²/day of solar energy in Bonney Lake. The sunniest Decembers were 1985 and 2009 at 1.1 kWh/m²/day, and the cloudiest were 2012, 2015 and 2019, among others at 0.7.
Average wind speed in Bonney Lake during December is 0.2 m/s. The windiest December was 1985 at 0.4 m/s, while the calmest was 2025 at 0.1 m/s.
Ranked against the other 11 months using 1981–2025 averages.
| Metric | 1980s | 1990s | 2000s | 2010s | 2020s | Change |
|---|---|---|---|---|---|---|
| Avg Temp | -2.4°C | -1.7°C | -1.4°C | -1.2°C | 0.0°C | +2.4°C |
| Avg High | 0.6°C | 0.9°C | 1.2°C | 1.3°C | 2.4°C | +1.8°C |
| Avg Low | -5.4°C | -4.2°C | -4.0°C | -3.7°C | -2.3°C | +3.1°C |
| Avg Rain | 200 mm | 260 mm | 218 mm | 235 mm | 284 mm | +84 mm |
December temperatures in Bonney Lake have risen by about 3.3°C between 1981–1985 and 2021–2025.
December has ranged from a record low of -27.7°C (1990) to a record high of 11.3°C (2005).
Rainfall in December is a relatively wet time of year, averaging 236 mm, with a wettest year of 450 mm.
Daytime highs and overnight lows have shifted differently — highs rose about 0.4°C per decade while lows rose 0.7°C per decade, narrowing the gap between day and night.
A quieter season to visit Bonney Lake
If your dates are flexible, the more temperate months of August and July tend to be the most comfortable for visiting Bonney Lake. That said, December — with days averaging 1.2°C and nights around -4°C (mean -1.4°C) and higher rainfall (236 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 | 3.9°C | 1.6°C | -0.6°C | 10.4°C | -5.5°C | 447 mm | 97% | 0.1 m/s | — |
| 2024 | 2.9°C | 0.8°C | -1.4°C | 5.8°C | -6.3°C | 268 mm | 95% | 0.2 m/s | 0.9 |
| 2023 🔥 | 4.6°C | 2.2°C | -0.2°C | 10.2°C | -4.9°C | 283 mm | 93% | 0.2 m/s | 0.8 |
| 2022 | -0.2°C | -2.7°C | -5.3°C | 7.3°C | -19.0°C | 231 mm | 98% | 0.2 m/s | 0.8 |
| 2021 | -0.3°C | -2.7°C | -5.0°C | 9.1°C | -16.9°C | 259 mm | 98% | 0.2 m/s | 0.8 |
| 2020 | 3.2°C | 0.8°C | -1.5°C | 7.8°C | -4.9°C | 215 mm | 93% | 0.2 m/s | 0.9 |
| 2019 | 3.0°C | 0.8°C | -1.3°C | 6.3°C | -6.2°C | 232 mm | 96% | 0.2 m/s | 0.7 |
| 2018 | 2.0°C | -0.3°C | -2.6°C | 6.8°C | -7.1°C | 249 mm | 94% | 0.2 m/s | 0.9 |
| 2017 | 1.5°C | -1.3°C | -4.2°C | 6.2°C | -14.4°C | 201 mm | 92% | 0.2 m/s | 1 |
| 2016 | -1.7°C | -4.3°C | -7.0°C | 1.6°C | -18.1°C | 197 mm | 99% | 0.2 m/s | 0.9 |
| 2015 | 1.2°C | -0.8°C | -2.8°C | 9.9°C | -12.5°C | 436 mm | 98% | 0.2 m/s | 0.7 |
| 2014 | 3.0°C | 0.3°C | -2.5°C | 10.3°C | -15.4°C | 211 mm | 94% | 0.2 m/s | 1 |
| 2013 | 0.2°C | -2.6°C | -5.3°C | 5.5°C | -22.2°C | 158 mm | 92% | 0.3 m/s | 0.9 |
| 2012 | 0.4°C | -2.1°C | -4.5°C | 4.9°C | -12.9°C | 282 mm | 99% | 0.2 m/s | 0.7 |
| 2011 | 2.6°C | -0.4°C | -3.3°C | 7.4°C | -8.7°C | 141 mm | 90% | 0.2 m/s | 1 |
| 2010 | 0.6°C | -1.5°C | -3.7°C | 6.9°C | -19.3°C | 246 mm | 98% | 0.2 m/s | 0.8 |
| 2009 | 0.7°C | -2.4°C | -5.5°C | 6.7°C | -15.6°C | 122 mm | 85% | 0.2 m/s | 1.1 |
| 2008 | -0.7°C | -3.8°C | -6.8°C | 7.8°C | -21.7°C | 243 mm | 95% | 0.2 m/s | 0.8 |
| 2007 | 0.8°C | -1.6°C | -4.0°C | 8.3°C | -13.4°C | 351 mm | 97% | 0.2 m/s | 0.7 |
| 2006 | 1.1°C | -1.7°C | -4.6°C | 6.0°C | -12.8°C | 239 mm | 97% | 0.2 m/s | 0.8 |
| 2005 | 1.1°C | -1.4°C | -3.9°C | 11.3°C | -13.1°C | 240 mm | 96% | 0.2 m/s | 0.9 |
| 2004 | 3.7°C | 1.4°C | -0.9°C | 10.4°C | -5.0°C | 170 mm | 93% | 0.2 m/s | 0.8 |
| 2003 | 1.1°C | -0.9°C | -3.0°C | 5.2°C | -12.0°C | 195 mm | 96% | 0.2 m/s | 0.8 |
| 2002 | 3.1°C | 0.6°C | -2.0°C | 9.0°C | -8.5°C | 226 mm | 94% | 0.2 m/s | 0.7 |
| 2001 | 0.4°C | -2.1°C | -4.5°C | 1.7°C | -10.1°C | 269 mm | 98% | 0.2 m/s | 0.9 |
| 2000 | 1.0°C | -1.8°C | -4.5°C | 5.3°C | -11.3°C | 125 mm | 94% | 0.2 m/s | 0.9 |
| 1999 | 2.5°C | 0.3°C | -1.8°C | 6.3°C | -5.2°C | 285 mm | 94% | 0.2 m/s | 0.8 |
| 1998 | 0.1°C | -2.3°C | -4.6°C | 5.7°C | -19.2°C | 375 mm | 94% | 0.2 m/s | 0.8 |
| 1997 | 2.1°C | -0.4°C | -2.9°C | 5.6°C | -9.4°C | 145 mm | 92% | 0.2 m/s | 1 |
| 1996 🌧️ | 0.5°C | -2.3°C | -5.1°C | 4.7°C | -11.0°C | 450 mm | 98% | 0.2 m/s | 0.8 |
| 1995 | 1.6°C | -1.0°C | -3.5°C | 6.6°C | -13.5°C | 263 mm | 93% | 0.2 m/s | 0.8 |
| 1994 | 0.4°C | -2.2°C | -4.8°C | 6.1°C | -19.8°C | 272 mm | 96% | 0.2 m/s | 0.9 |
| 1993 | 3.2°C | 0.4°C | -2.4°C | 7.8°C | -7.7°C | 197 mm | 89% | 0.3 m/s | 0.8 |
| 1992 | -1.2°C | -3.8°C | -6.5°C | 1.5°C | -13.1°C | 212 mm | 97% | 0.2 m/s | 0.9 |
| 1991 | 1.9°C | -0.1°C | -2.2°C | 5.0°C | -7.9°C | 195 mm | 95% | 0.2 m/s | 0.9 |
| 1990 | -1.8°C | -5.3°C | -8.7°C | 4.9°C | -27.7°C | 210 mm | 96% | 0.2 m/s | 0.8 |
| 1989 | 4.3°C | 1.4°C | -1.5°C | 10.3°C | -7.6°C | 157 mm | 91% | 0.3 m/s | 0.9 |
| 1988 | 1.6°C | -1.1°C | -3.9°C | 8.1°C | -16.4°C | 166 mm | 94% | 0.2 m/s | 0.8 |
| 1987 | -0.1°C | -3.4°C | -6.7°C | 5.8°C | -14.8°C | 298 mm | 96% | 0.3 m/s | 0.8 |
| 1986 | 2.1°C | -0.9°C | -3.9°C | 6.5°C | -8.5°C | 137 mm | 94% | 0.2 m/s | 0.8 |
| 1985 | 0.5°C | -2.8°C | -6.2°C | 5.2°C | -19.8°C | 60 mm | 90% | 0.4 m/s | 1.1 |
| 1984 | -1.4°C | -4.6°C | -7.9°C | 1.6°C | -22.0°C | 210 mm | 96% | 0.3 m/s | 1 |
| 1983 ❄️ | -3.1°C | -6.4°C | -9.6°C | 1.5°C | -25.7°C | 198 mm | 97% | 0.2 m/s | — |
| 1982 | 0.8°C | -2.1°C | -4.9°C | 7.2°C | -13.9°C | 279 mm | 96% | 0.2 m/s | — |
| 1981 | 0.7°C | -1.6°C | -3.9°C | 4.9°C | -11.4°C | 296 mm | 97% | 0.2 m/s | — |
Actual recorded December data for each year, 1981–2025 — sourced from NASA POWER.
The average high in December is around 1.2°C with lows near -4°C (mean -1.4°C), based on 45 years of NASA POWER data.
December averages 236 mm of rainfall in Bonney Lake, a relatively wet time of year. The wettest on record was 450 mm in 1996.
The hottest December reached 11.3°C in 2005. The coldest dipped to -27.7°C in 1990.
Comparing the earliest years on record (1981–1985) with the most recent (2021–2025), average December temperatures have risen by about 3.3°C. Daytime highs moved from -0.5°C to 2.2°C and overnight lows from -6.5°C to -2.5°C over the same span.
December is one of the cooler months of the year in Bonney Lake and a relatively wet time of year, so plan for around 1.2°C daytime highs and -4°C at night.
Yes — December is the coldest month of the year in Bonney Lake, averaging -1.4°C.
For December in Bonney Lake, pack warm layers and a jacket for chilly mornings, with typical highs of 1.2°C and lows of -4°C. Bring an umbrella or light rain jacket too.
Relative humidity in December averages 95% — quite humid.
Average wind speed in December is 0.2 m/s. The windiest December on record averaged 0.4 m/s (1985).
The wettest December on record was 1996 with 450 mm. On average, December sees 236 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 Bonney Lake 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.
