December is one of the cooler months of the year in Wasilla, with average highs near -6.2°C and lows around -11.7°C (mean -8.9°C). It is about average for rainfall, averaging 71 mm of rainfall and 89% relative humidity across the period.
December is one of the cooler months of the year in Wasilla. Across 45 years of records, the warmest December in Wasilla was 2014 — when the month averaged -4.2°C — while the coldest was 2025 at -15.6°C. Typical December days reach -6.2°C with nights near -11.7°C. The long-term trend is cooling, about 0.2°C per decade.
December is about average for rainfall in Wasilla, averaging 71 mm of rainfall. The wettest December on record was 1999 with 132 mm, while the driest was 1983 at 24 mm.
Relative humidity in Wasilla during December averages 89%. The most humid December was 2011 at 94%, and the least humid was 1983 at 79%.
December receives about 0.1 kWh/m²/day of solar energy in Wasilla. The sunniest Decembers were 2022, 2023 and 2024, among others at 0.2 kWh/m²/day, and the cloudiest were 2018, 2019 and 2020, among others at 0.1.
Average wind speed in Wasilla during December is 1.6 m/s. The windiest December was 2025 at 2.4 m/s, while the calmest was 1983 at 1.1 m/s.
Ranked against the other 11 months using 1981–2025 averages.
| Metric | 1980s | 1990s | 2000s | 2010s | 2020s | Change |
|---|---|---|---|---|---|---|
| Avg Temp | -7.8°C | -10.2°C | -8.5°C | -8.5°C | -10.1°C | -2.3°C |
| Avg High | -5.2°C | -7.1°C | -5.9°C | -6.1°C | -7.2°C | -2°C |
| Avg Low | -10.4°C | -13.4°C | -11.1°C | -10.9°C | -13.0°C | -2.6°C |
| Avg Rain | 76 mm | 81 mm | 63 mm | 68 mm | 68 mm | -8 mm |
December temperatures in Wasilla have fallen by about 2.8°C between 1981–1985 and 2021–2025.
December has ranged from a record low of -35.7°C (1990) to a record high of 4.5°C (1999).
Rainfall in December is about average for rainfall, averaging 71 mm, with a wettest year of 132 mm.
A quieter season to visit Wasilla
If your dates are flexible, the more temperate months of July and August tend to be the most comfortable for visiting Wasilla. That said, December — with days averaging -6.2°C and nights around -11.7°C (mean -8.9°C) and moderate rainfall (71 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 ❄️ | -13.0°C | -15.6°C | -18.2°C | 0.9°C | -25.9°C | 25 mm | 80% | 2.4 m/s | — |
| 2024 | -2.4°C | -4.4°C | -6.4°C | 1.2°C | -16.7°C | 64 mm | 92% | 1.6 m/s | 0.2 |
| 2023 | -7.1°C | -10.7°C | -14.3°C | -1.0°C | -24.9°C | 76 mm | 93% | 1.3 m/s | 0.2 |
| 2022 | -7.9°C | -11.0°C | -14.2°C | -1.1°C | -25.8°C | 73 mm | 88% | 1.7 m/s | 0.2 |
| 2021 | -8.3°C | -11.7°C | -15.2°C | 0.3°C | -28.9°C | 94 mm | 90% | 1.3 m/s | 0.2 |
| 2020 | -4.7°C | -7.2°C | -9.8°C | 2.0°C | -19.8°C | 73 mm | 92% | 1.6 m/s | 0.1 |
| 2019 | -4.2°C | -6.7°C | -9.3°C | 3.3°C | -20.5°C | 61 mm | 86% | 1.6 m/s | 0.1 |
| 2018 | -4.4°C | -6.7°C | -9.1°C | 2.9°C | -18.4°C | 102 mm | 92% | 1.4 m/s | 0.1 |
| 2017 | -3.2°C | -5.5°C | -7.9°C | 4.0°C | -14.5°C | 72 mm | 90% | 1.8 m/s | 0.1 |
| 2016 | -7.5°C | -10.1°C | -12.7°C | -2.3°C | -21.3°C | 50 mm | 83% | 1.3 m/s | 0.2 |
| 2015 | -4.6°C | -6.9°C | -9.2°C | 3.3°C | -18.6°C | 55 mm | 89% | 1.7 m/s | 0.2 |
| 2014 🔥 | -2.5°C | -4.2°C | -5.9°C | 2.0°C | -10.4°C | 77 mm | 92% | 1.5 m/s | 0.1 |
| 2013 | -7.8°C | -10.6°C | -13.4°C | 2.1°C | -24.3°C | 37 mm | 86% | 1.3 m/s | 0.2 |
| 2012 | -10.5°C | -13.2°C | -16.0°C | 0.1°C | -27.3°C | 65 mm | 90% | 2 m/s | 0.2 |
| 2011 | -5.9°C | -8.2°C | -10.6°C | 3.4°C | -21.5°C | 115 mm | 94% | 1.9 m/s | 0.1 |
| 2010 | -10.1°C | -12.6°C | -15.1°C | 0.9°C | -21.4°C | 45 mm | 84% | 1.7 m/s | 0.2 |
| 2009 | -4.6°C | -6.9°C | -9.3°C | 1.5°C | -23.9°C | 50 mm | 84% | 1.5 m/s | 0.1 |
| 2008 | -9.6°C | -12.3°C | -15.0°C | 0.5°C | -27.6°C | 38 mm | 89% | 1.4 m/s | 0.2 |
| 2007 | -6.3°C | -9.1°C | -12.0°C | 2.4°C | -22.5°C | 55 mm | 88% | 1.6 m/s | 0.1 |
| 2006 | -6.1°C | -9.1°C | -12.1°C | 0.1°C | -25.2°C | 76 mm | 92% | 1.6 m/s | 0.1 |
| 2005 | -2.8°C | -5.0°C | -7.2°C | 3.1°C | -19.8°C | 83 mm | 89% | 1.6 m/s | 0.1 |
| 2004 | -5.5°C | -8.1°C | -10.7°C | 2.1°C | -21.4°C | 84 mm | 87% | 1.5 m/s | 0.1 |
| 2003 | -6.8°C | -10.1°C | -13.3°C | 0.4°C | -29.4°C | 80 mm | 89% | 1.6 m/s | 0.1 |
| 2002 | -4.7°C | -6.4°C | -8.2°C | 2.6°C | -18.9°C | 55 mm | 92% | 1.2 m/s | 0.1 |
| 2001 | -9.6°C | -12.6°C | -15.6°C | 0.3°C | -24.7°C | 48 mm | 90% | 1.7 m/s | 0.2 |
| 2000 | -2.7°C | -5.4°C | -8.0°C | 2.1°C | -18.3°C | 60 mm | 88% | 1.7 m/s | 0.1 |
| 1999 🌧️ | -8.3°C | -11.6°C | -14.8°C | 4.5°C | -24.6°C | 132 mm | 88% | 1.7 m/s | 0.1 |
| 1998 | -7.8°C | -10.7°C | -13.5°C | -3.1°C | -22.7°C | 57 mm | 84% | 1.4 m/s | 0.1 |
| 1997 | -6.7°C | -10.0°C | -13.4°C | 1.2°C | -21.7°C | 85 mm | 89% | 1.5 m/s | 0.1 |
| 1996 | -8.8°C | -12.0°C | -15.2°C | 0.4°C | -27.2°C | 30 mm | 82% | 1.6 m/s | 0.1 |
| 1995 | -7.0°C | -9.1°C | -11.3°C | 1.0°C | -29.2°C | 42 mm | 87% | 1.4 m/s | 0.1 |
| 1994 | -6.8°C | -9.7°C | -12.5°C | -0.3°C | -27.5°C | 109 mm | 90% | 1.7 m/s | 0.1 |
| 1993 | -3.5°C | -6.3°C | -9.1°C | 1.4°C | -16.3°C | 70 mm | 91% | 1.5 m/s | 0.1 |
| 1992 | -9.0°C | -12.1°C | -15.3°C | 2.0°C | -25.8°C | 64 mm | 88% | 1.5 m/s | 0.1 |
| 1991 | -5.9°C | -9.3°C | -12.6°C | -0.5°C | -22.1°C | 109 mm | 93% | 1.5 m/s | 0.1 |
| 1990 | -7.5°C | -11.6°C | -15.8°C | -1.0°C | -35.7°C | 114 mm | 90% | 1.5 m/s | 0.1 |
| 1989 | -3.9°C | -6.9°C | -9.9°C | 0.0°C | -28.7°C | 87 mm | 90% | 1.6 m/s | 0.1 |
| 1988 | -5.1°C | -8.4°C | -11.7°C | -0.2°C | -22.6°C | 87 mm | 91% | 1.9 m/s | 0.1 |
| 1987 | -7.3°C | -10.3°C | -13.4°C | -0.2°C | -25.2°C | 64 mm | 88% | 1.4 m/s | 0.1 |
| 1986 | -2.8°C | -4.9°C | -7.0°C | 2.4°C | -16.8°C | 109 mm | 92% | 1.7 m/s | 0.1 |
| 1985 | -2.7°C | -4.6°C | -6.5°C | 3.3°C | -15.0°C | 96 mm | 91% | 1.8 m/s | 0.1 |
| 1984 | -5.8°C | -8.8°C | -11.8°C | 0.8°C | -23.1°C | 105 mm | 87% | 1.5 m/s | 0.1 |
| 1983 | -5.8°C | -7.7°C | -9.7°C | 0.3°C | -16.6°C | 24 mm | 79% | 1.1 m/s | — |
| 1982 | -4.5°C | -7.1°C | -9.6°C | 2.2°C | -23.7°C | 74 mm | 88% | 1.9 m/s | — |
| 1981 | -8.6°C | -11.1°C | -13.6°C | 1.2°C | -24.3°C | 37 mm | 86% | 1.4 m/s | — |
Actual recorded December data for each year, 1981–2025 — sourced from NASA POWER.
The average high in December is around -6.2°C with lows near -11.7°C (mean -8.9°C), based on 45 years of NASA POWER data.
December averages 71 mm of rainfall in Wasilla, about average for rainfall. The wettest on record was 132 mm in 1999.
The hottest December reached 4.5°C in 1999. The coldest dipped to -35.7°C in 1990.
Comparing the earliest years on record (1981–1985) with the most recent (2021–2025), average December temperatures have fallen by about 2.8°C. Daytime highs moved from -5.5°C to -7.7°C and overnight lows from -10.2°C to -13.7°C over the same span.
December is one of the cooler months of the year in Wasilla and about average for rainfall, so plan for around -6.2°C daytime highs and -11.7°C at night.
Not quite — December is the 2nd coolest month in Wasilla, averaging -8.9°C.
For December in Wasilla, pack warm layers and a jacket for chilly mornings, with typical highs of -6.2°C and lows of -11.7°C. Bring an umbrella or light rain jacket too.
Relative humidity in December averages 89% — quite humid.
Average wind speed in December is 1.6 m/s. The windiest December on record averaged 2.4 m/s (2025).
The wettest December on record was 1999 with 132 mm. On average, December sees 71 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 Wasilla 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.
