December is one of the cooler months of the year in Kalispell, with average highs near -3.8°C and lows around -11.4°C (mean -7.6°C). It is a relatively wet time of year, averaging 71 mm of rainfall and 96% relative humidity across the period.
December is one of the cooler months of the year in Kalispell. Across 45 years of records, the warmest December in Kalispell was 2025 — when the month averaged -1.8°C — while the coldest was 1983 at -15°C. Typical December days reach -3.8°C with nights near -11.4°C. The long-term trend is warming, about 0.9°C per decade.
December is a relatively wet time of year in Kalispell, averaging 71 mm of rainfall. The wettest December on record was 2025 with 156 mm, while the driest was 1985 at 21 mm.
Relative humidity in Kalispell during December averages 96%. The most humid December was 1985 at 99%, and the least humid was 2002 at 92%.
December receives about 0.8 kWh/m²/day of solar energy in Kalispell. The sunniest Decembers were 1986, 1991 and 2011, among others at 1 kWh/m²/day, and the cloudiest was 2012 at 0.6.
Average wind speed in Kalispell during December is 0.6 m/s. The windiest December was 1990 at 0.8 m/s, while the calmest were 2017 and 2024 at 0.5 m/s.
Ranked against the other 11 months using 1981–2025 averages.
| Metric | 1980s | 1990s | 2000s | 2010s | 2020s | Change |
|---|---|---|---|---|---|---|
| Avg Temp | -9.1°C | -8.0°C | -7.8°C | -7.4°C | -4.8°C | +4.3°C |
| Avg High | -5.0°C | -4.2°C | -3.9°C | -3.6°C | -1.4°C | +3.6°C |
| Avg Low | -13.1°C | -11.8°C | -11.7°C | -11.3°C | -8.2°C | +4.9°C |
| Avg Rain | 55 mm | 75 mm | 67 mm | 85 mm | 74 mm | +19 mm |
December temperatures in Kalispell have risen by about 5.4°C between 1981–1985 and 2021–2025.
December has ranged from a record low of -42.6°C (1983) to a record high of 9.3°C (2021).
Rainfall in December is a relatively wet time of year, averaging 71 mm, with a wettest year of 156 mm.
A quieter season to visit Kalispell
If your dates are flexible, the more temperate months of August and July tend to be the most comfortable for visiting Kalispell. That said, December — with days averaging -3.8°C and nights around -11.4°C (mean -7.6°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 🔥 🌧️ | 0.9°C | -1.8°C | -4.5°C | 6.2°C | -14.8°C | 156 mm | 94% | 0.7 m/s | — |
| 2024 | -0.4°C | -3.4°C | -6.5°C | 2.2°C | -11.7°C | 58 mm | 96% | 0.5 m/s | 0.8 |
| 2023 | 0.9°C | -2.3°C | -5.5°C | 8.4°C | -13.3°C | 41 mm | 94% | 0.6 m/s | 0.8 |
| 2022 | -5.6°C | -9.9°C | -14.3°C | 0.9°C | -40.6°C | 68 mm | 98% | 0.6 m/s | 0.7 |
| 2021 | -4.1°C | -7.7°C | -11.4°C | 9.3°C | -23.2°C | 78 mm | 95% | 0.6 m/s | 0.7 |
| 2020 | -0.3°C | -3.7°C | -7.2°C | 3.3°C | -11.8°C | 42 mm | 92% | 0.6 m/s | 0.9 |
| 2019 | -0.3°C | -3.8°C | -7.3°C | 5.6°C | -13.0°C | 58 mm | 94% | 0.6 m/s | 0.7 |
| 2018 | -1.7°C | -5.6°C | -9.5°C | 2.1°C | -21.2°C | 58 mm | 93% | 0.7 m/s | 0.8 |
| 2017 | -4.6°C | -8.7°C | -12.8°C | 1.5°C | -25.6°C | 104 mm | 95% | 0.5 m/s | 0.8 |
| 2016 | -7.6°C | -12.3°C | -16.9°C | 0.7°C | -32.3°C | 86 mm | 98% | 0.6 m/s | 0.8 |
| 2015 | -2.8°C | -6.1°C | -9.5°C | 4.2°C | -21.7°C | 114 mm | 96% | 0.6 m/s | 0.7 |
| 2014 | -2.9°C | -6.4°C | -10.0°C | 3.7°C | -32.0°C | 93 mm | 96% | 0.6 m/s | 0.8 |
| 2013 | -6.0°C | -10.3°C | -14.5°C | 0.8°C | -35.0°C | 86 mm | 96% | 0.6 m/s | 0.9 |
| 2012 | -3.5°C | -7.0°C | -10.4°C | 3.0°C | -18.4°C | 95 mm | 97% | 0.6 m/s | 0.6 |
| 2011 | -2.2°C | -5.9°C | -9.7°C | 2.3°C | -16.2°C | 53 mm | 95% | 0.6 m/s | 1 |
| 2010 | -4.2°C | -8.2°C | -12.3°C | 0.3°C | -29.7°C | 102 mm | 98% | 0.7 m/s | 0.9 |
| 2009 | -7.2°C | -11.0°C | -14.8°C | 0.4°C | -26.5°C | 75 mm | 92% | 0.6 m/s | 0.9 |
| 2008 | -7.2°C | -11.5°C | -15.9°C | 1.4°C | -32.4°C | 109 mm | 97% | 0.6 m/s | 0.8 |
| 2007 | -3.5°C | -7.2°C | -10.9°C | 2.5°C | -17.8°C | 90 mm | 95% | 0.6 m/s | 0.9 |
| 2006 | -3.2°C | -6.9°C | -10.6°C | 1.0°C | -18.4°C | 53 mm | 96% | 0.7 m/s | 0.9 |
| 2005 | -5.2°C | -9.0°C | -12.8°C | 2.2°C | -25.9°C | 72 mm | 98% | 0.6 m/s | 0.9 |
| 2004 | -1.3°C | -5.1°C | -8.8°C | 2.4°C | -19.4°C | 64 mm | 94% | 0.6 m/s | 0.7 |
| 2003 | -2.7°C | -6.6°C | -10.5°C | 1.8°C | -22.7°C | 55 mm | 97% | 0.6 m/s | 0.9 |
| 2002 | 0.1°C | -3.6°C | -7.4°C | 5.3°C | -13.0°C | 57 mm | 92% | 0.6 m/s | 0.7 |
| 2001 | -4.2°C | -8.2°C | -12.2°C | 0.2°C | -19.4°C | 51 mm | 98% | 0.6 m/s | 0.8 |
| 2000 | -4.3°C | -8.7°C | -13.0°C | 0.4°C | -23.4°C | 46 mm | 96% | 0.6 m/s | 0.9 |
| 1999 | -2.6°C | -6.0°C | -9.3°C | 0.6°C | -13.5°C | 70 mm | 97% | 0.6 m/s | 0.7 |
| 1998 | -4.6°C | -7.9°C | -11.2°C | 1.6°C | -32.8°C | 96 mm | 95% | 0.7 m/s | 0.7 |
| 1997 | -2.1°C | -5.7°C | -9.2°C | 1.7°C | -14.0°C | 35 mm | 93% | 0.6 m/s | 0.9 |
| 1996 | -5.6°C | -9.5°C | -13.5°C | 0.6°C | -29.0°C | 153 mm | 99% | 0.6 m/s | 0.9 |
| 1995 | -2.7°C | -6.2°C | -9.7°C | 4.0°C | -23.7°C | 76 mm | 93% | 0.6 m/s | 0.9 |
| 1994 | -3.6°C | -7.3°C | -11.0°C | 0.9°C | -21.7°C | 50 mm | 96% | 0.6 m/s | 0.9 |
| 1993 | -2.8°C | -6.1°C | -9.3°C | 2.4°C | -13.8°C | 47 mm | 96% | 0.6 m/s | 0.8 |
| 1992 | -5.8°C | -10.3°C | -14.7°C | 0.3°C | -25.7°C | 75 mm | 98% | 0.7 m/s | 0.8 |
| 1991 | -3.2°C | -6.9°C | -10.6°C | 0.2°C | -18.4°C | 49 mm | 97% | 0.7 m/s | 1 |
| 1990 | -9.2°C | -14.3°C | -19.3°C | 0.8°C | -42.6°C | 96 mm | 98% | 0.8 m/s | 0.8 |
| 1989 | -2.9°C | -6.7°C | -10.5°C | 2.9°C | -22.2°C | 65 mm | 96% | 0.6 m/s | 0.7 |
| 1988 | -4.3°C | -8.3°C | -12.3°C | 0.5°C | -23.7°C | 57 mm | 97% | 0.6 m/s | 0.9 |
| 1987 | -2.8°C | -6.3°C | -9.8°C | 5.1°C | -20.2°C | 57 mm | 93% | 0.6 m/s | 0.8 |
| 1986 | -4.5°C | -8.2°C | -12.0°C | 0.1°C | -17.4°C | 27 mm | 98% | 0.6 m/s | 1 |
| 1985 | -6.4°C | -10.7°C | -14.9°C | -0.2°C | -32.1°C | 21 mm | 99% | 0.6 m/s | 0.9 |
| 1984 | -6.9°C | -11.6°C | -16.2°C | -0.7°C | -26.2°C | 70 mm | 98% | 0.6 m/s | 1 |
| 1983 ❄️ | -9.9°C | -15.0°C | -20.1°C | 0.2°C | -42.6°C | 55 mm | 98% | 0.6 m/s | — |
| 1982 | -4.1°C | -7.6°C | -11.0°C | 1.6°C | -19.1°C | 66 mm | 96% | 0.6 m/s | — |
| 1981 | -3.6°C | -7.3°C | -10.9°C | 1.7°C | -20.7°C | 78 mm | 96% | 0.6 m/s | — |
Actual recorded December data for each year, 1981–2025 — sourced from NASA POWER.
The average high in December is around -3.8°C with lows near -11.4°C (mean -7.6°C), based on 45 years of NASA POWER data.
December averages 71 mm of rainfall in Kalispell, a relatively wet time of year. The wettest on record was 156 mm in 2025.
The hottest December reached 9.3°C in 2021. The coldest dipped to -42.6°C in 1983.
Comparing the earliest years on record (1981–1985) with the most recent (2021–2025), average December temperatures have risen by about 5.4°C. Daytime highs moved from -6.2°C to -1.7°C and overnight lows from -14.6°C to -8.4°C over the same span.
December is one of the cooler months of the year in Kalispell and a relatively wet time of year, so plan for around -3.8°C daytime highs and -11.4°C at night.
Yes — December is the coldest month of the year in Kalispell, averaging -7.6°C.
For December in Kalispell, pack warm layers and a jacket for chilly mornings, with typical highs of -3.8°C and lows of -11.4°C. Bring an umbrella or light rain jacket too.
Relative humidity in December averages 96% — quite humid.
Average wind speed in December is 0.6 m/s. The windiest December on record averaged 0.8 m/s (1990).
The wettest December on record was 2025 with 156 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 Kalispell 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.
