December is one of the cooler months of the year in Grand Junction, with average highs near 3.2°C and lows around -7.1°C (mean -1.9°C). It is about average for rainfall, averaging 32 mm of rainfall and 70% relative humidity across the period.
December is one of the cooler months of the year in Grand Junction. Across 45 years of records, the warmest December in Grand Junction was 2025 — when the month averaged 3.4°C — while the coldest was 2009 at -6.7°C. Typical December days reach 3.2°C with nights near -7.1°C. The long-term trend is warming, about 0.5°C per decade.
December is about average for rainfall in Grand Junction, averaging 32 mm of rainfall. The wettest December on record was 2021 with 83 mm, while the driest was 2017 at 6 mm.
Relative humidity in Grand Junction during December averages 70%. The most humid December was 2007 at 83%, and the least humid was 2017 at 45%.
December receives about 2.2 kWh/m²/day of solar energy in Grand Junction. The sunniest December was 2011 at 2.5 kWh/m²/day, and the cloudiest was 2010 at 1.7.
Average wind speed in Grand Junction during December is 1.9 m/s. The windiest December was 2021 at 2.8 m/s, while the calmest was 1986 at 1.3 m/s.
Ranked against the other 11 months using 1981–2025 averages.
| Metric | 1980s | 1990s | 2000s | 2010s | 2020s | Change |
|---|---|---|---|---|---|---|
| Avg Temp | -2.6°C | -2.3°C | -2.7°C | -1.6°C | 0.1°C | +2.7°C |
| Avg High | 2.6°C | 3.0°C | 2.6°C | 3.3°C | 5.1°C | +2.5°C |
| Avg Low | -7.7°C | -7.7°C | -7.9°C | -6.6°C | -5.0°C | +2.7°C |
| Avg Rain | 31 mm | 26 mm | 34 mm | 35 mm | 35 mm | +4 mm |
December temperatures in Grand Junction have risen by about 3.1°C between 1981–1985 and 2021–2025.
December has ranged from a record low of -25.2°C (1988) to a record high of 16.6°C (2025).
Rainfall in December is about average for rainfall, averaging 32 mm, with a wettest year of 83 mm.
A quieter season to visit Grand Junction
If your dates are flexible, the more temperate months of August and June tend to be the most comfortable for visiting Grand Junction. That said, December — with days averaging 3.2°C and nights around -7.1°C (mean -1.9°C) and moderate rainfall (32 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 🔥 | 8.7°C | 3.4°C | -1.9°C | 16.6°C | -8.1°C | 13 mm | 62% | 1.8 m/s | — |
| 2024 | 6.4°C | 1.5°C | -3.5°C | 10.8°C | -8.8°C | 10 mm | 60% | 1.5 m/s | 2.4 |
| 2023 | 5.3°C | 0.6°C | -4.2°C | 11.1°C | -11.2°C | 22 mm | 63% | 1.4 m/s | 2.3 |
| 2022 | 2.7°C | -2.1°C | -7.0°C | 8.8°C | -14.5°C | 59 mm | 75% | 2.1 m/s | 1.9 |
| 2021 🌧️ | 4.8°C | -0.3°C | -5.5°C | 14.3°C | -16.5°C | 83 mm | 69% | 2.8 m/s | 2 |
| 2020 | 2.8°C | -2.5°C | -7.8°C | 9.8°C | -13.3°C | 22 mm | 64% | 1.6 m/s | 2.3 |
| 2019 | 3.5°C | -0.9°C | -5.4°C | 9.4°C | -13.2°C | 27 mm | 68% | 1.7 m/s | 2.1 |
| 2018 | 2.8°C | -1.9°C | -6.6°C | 9.4°C | -13.3°C | 28 mm | 69% | 1.6 m/s | 2.2 |
| 2017 | 6.7°C | 1.5°C | -3.7°C | 14.0°C | -8.9°C | 6 mm | 45% | 1.8 m/s | 2.4 |
| 2016 | 3.2°C | -1.9°C | -7.0°C | 9.6°C | -13.0°C | 47 mm | 68% | 2.1 m/s | 2.1 |
| 2015 | 1.0°C | -4.2°C | -9.5°C | 8.8°C | -25.0°C | 47 mm | 74% | 2.2 m/s | 2.1 |
| 2014 | 4.1°C | -0.5°C | -5.2°C | 11.5°C | -18.1°C | 41 mm | 74% | 1.7 m/s | 1.9 |
| 2013 | 1.1°C | -4.2°C | -9.5°C | 6.8°C | -21.0°C | 26 mm | 72% | 1.7 m/s | 2.4 |
| 2012 | 2.9°C | -2.4°C | -7.7°C | 13.8°C | -18.9°C | 43 mm | 70% | 2.3 m/s | 2.1 |
| 2011 | 3.2°C | -2.0°C | -7.2°C | 10.0°C | -13.9°C | 16 mm | 64% | 1.6 m/s | 2.5 |
| 2010 | 4.7°C | 0.3°C | -4.2°C | 9.6°C | -17.6°C | 74 mm | 74% | 2.1 m/s | 1.7 |
| 2009 ❄️ | -1.0°C | -6.7°C | -12.4°C | 7.4°C | -21.7°C | 47 mm | 77% | 2 m/s | 2.2 |
| 2008 | 1.9°C | -3.6°C | -9.1°C | 11.5°C | -21.4°C | 49 mm | 74% | 2.4 m/s | 2 |
| 2007 | -0.4°C | -5.8°C | -11.2°C | 7.0°C | -21.9°C | 78 mm | 83% | 2.1 m/s | 1.9 |
| 2006 | 3.3°C | -1.9°C | -7.1°C | 9.5°C | -15.5°C | 16 mm | 73% | 1.8 m/s | 2.3 |
| 2005 | 3.1°C | -2.2°C | -7.4°C | 10.1°C | -18.8°C | 27 mm | 65% | 1.9 m/s | 2.3 |
| 2004 | 3.7°C | -1.4°C | -6.5°C | 9.5°C | -15.8°C | 30 mm | 72% | 1.9 m/s | 2.4 |
| 2003 | 4.1°C | -0.8°C | -5.7°C | 11.1°C | -13.3°C | 34 mm | 65% | 2.2 m/s | 2.2 |
| 2002 | 3.9°C | -0.7°C | -5.2°C | 9.0°C | -11.3°C | 16 mm | 70% | 1.6 m/s | 2.2 |
| 2001 | 2.7°C | -2.6°C | -8.0°C | 8.1°C | -12.2°C | 22 mm | 69% | 1.9 m/s | 2.2 |
| 2000 | 4.3°C | -0.9°C | -6.1°C | 8.7°C | -12.7°C | 21 mm | 65% | 1.8 m/s | 2.2 |
| 1999 | 4.4°C | -1.0°C | -6.4°C | 14.0°C | -12.1°C | 16 mm | 60% | 1.7 m/s | 2.2 |
| 1998 | 3.9°C | -1.3°C | -6.6°C | 14.2°C | -17.7°C | 17 mm | 62% | 1.8 m/s | 2.2 |
| 1997 | 2.5°C | -2.7°C | -7.9°C | 7.3°C | -15.3°C | 20 mm | 71% | 1.6 m/s | 2.3 |
| 1996 | 2.3°C | -2.8°C | -7.9°C | 9.3°C | -17.9°C | 44 mm | 74% | 2.6 m/s | 2 |
| 1995 | 5.5°C | 0.4°C | -4.6°C | 14.2°C | -11.2°C | 21 mm | 62% | 1.7 m/s | 2.3 |
| 1994 | 3.9°C | -1.2°C | -6.2°C | 9.3°C | -14.4°C | 30 mm | 72% | 1.6 m/s | 2.3 |
| 1993 | 2.8°C | -2.7°C | -8.3°C | 10.1°C | -16.4°C | 22 mm | 68% | 1.7 m/s | 2.3 |
| 1992 | 1.2°C | -4.1°C | -9.4°C | 7.9°C | -17.5°C | 38 mm | 77% | 2.2 m/s | 2.1 |
| 1991 | 3.7°C | -1.8°C | -7.3°C | 7.7°C | -13.7°C | 25 mm | 74% | 1.4 m/s | 2.3 |
| 1990 | -0.5°C | -6.2°C | -11.9°C | 9.5°C | -23.9°C | 31 mm | 68% | 2.2 m/s | 2.3 |
| 1989 | 3.7°C | -1.8°C | -7.3°C | 9.6°C | -12.8°C | 7 mm | 59% | 1.5 m/s | 2.4 |
| 1988 | 2.1°C | -3.8°C | -9.7°C | 10.5°C | -25.2°C | 38 mm | 71% | 1.9 m/s | 2.2 |
| 1987 | 1.8°C | -3.2°C | -8.2°C | 10.3°C | -15.9°C | 43 mm | 76% | 2 m/s | 2.1 |
| 1986 | 3.5°C | -1.7°C | -6.9°C | 10.0°C | -16.2°C | 19 mm | 71% | 1.3 m/s | 2.4 |
| 1985 | 2.2°C | -2.8°C | -7.7°C | 6.9°C | -15.2°C | 27 mm | 77% | 1.4 m/s | 2.1 |
| 1984 | 2.6°C | -2.4°C | -7.4°C | 7.1°C | -13.5°C | 40 mm | 78% | 2 m/s | 2 |
| 1983 | 0.2°C | -4.5°C | -9.2°C | 7.6°C | -23.8°C | 61 mm | 82% | 2.1 m/s | — |
| 1982 | 2.8°C | -2.3°C | -7.4°C | 8.3°C | -15.8°C | 19 mm | 73% | 2.1 m/s | — |
| 1981 | 4.2°C | -0.7°C | -5.7°C | 12.2°C | -14.2°C | 23 mm | 69% | 2 m/s | — |
Actual recorded December data for each year, 1981–2025 — sourced from NASA POWER.
The average high in December is around 3.2°C with lows near -7.1°C (mean -1.9°C), based on 45 years of NASA POWER data.
December averages 32 mm of rainfall in Grand Junction, about average for rainfall. The wettest on record was 83 mm in 2021.
The hottest December reached 16.6°C in 2025. The coldest dipped to -25.2°C in 1988.
Comparing the earliest years on record (1981–1985) with the most recent (2021–2025), average December temperatures have risen by about 3.1°C. Daytime highs moved from 2.4°C to 5.6°C and overnight lows from -7.5°C to -4.4°C over the same span.
December is one of the cooler months of the year in Grand Junction and about average for rainfall, so plan for around 3.2°C daytime highs and -7.1°C at night.
Not quite — December is the 2nd coolest month in Grand Junction, averaging -1.9°C.
For December in Grand Junction, pack warm layers and a jacket for chilly mornings, with typical highs of 3.2°C and lows of -7.1°C.
Relative humidity in December averages 70% — moderately humid.
Average wind speed in December is 1.9 m/s. The windiest December on record averaged 2.8 m/s (2021).
The wettest December on record was 2021 with 83 mm. On average, December sees 32 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 Grand Junction 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.
