Weather on December 15
Boulder, CO
55 Years of Data
Avg High
46°F
Avg Low
22°F
Warmest
2006
56°F avg
Coldest
2008
-4°F avg
About This Date
December 15th in Boulder, CO typically brings chilly winter weather, with average highs around 46°F and lows near 22°F. Over 55 years of records, the warmest December 15th was in 2006 (56°F average), while the coldest was 2008 (-4°F) — a 60°F range across recorded history. Precipitation has occurred on 13% of recorded December 15th dates, with snow falling 9% of the time (heaviest snowfall: 11.3"). The last decade has been 1.3°F warmer on this date compared to 20-30 years ago.
The last decade has been 1.3°F warmer on this date compared to 20-30 years ago.
Planning for December 15th in Boulder, CO? Bring layers as temperatures can vary throughout the day.
Warming Trend
1.1°F per decade on this date
| Year | High | Low | Avg | Precip | Snow |
|---|---|---|---|---|---|
| 2025 | 66° | 36° | 51° | — | — |
| 2024 | 54° | 32° | 43° | — | — |
| 2023 | 52° | 27° | 40° | — | — |
| 2022 | 34° | 21° | 28° | — | — |
| 2021 | 54° | 34° | 44° | — | — |
| 2020 | 34° | 19° | 27° | — | — |
| 2019 | 32° | 23° | 28° | — | — |
| 2018 | 55° | 32° | 44° | — | — |
| 2017 | 62° | 19° | 41° | — | — |
| 2016 | 65° | 13° | 39° | — | — |
| 2015 | 31° | 20° | 25° | 1.88" | 11.3" |
| 2014 | 44° | 26° | 35° | — | — |
| 2013 | 56° | 28° | 42° | — | — |
| 2012 | 46° | 28° | 37° | — | — |
| 2011 | 40° | 20° | 30° | — | — |
| 2010 | 58° | 34° | 46° | 0.05" | — |
| 2009 | 52° | 19° | 35° | — | — |
| 2008coldest | 7° | -15° | -4° | — | — |
| 2007 | 37° | 3° | 20° | — | — |
| 2006warmest | 70° | 43° | 56° | — | — |
| 2005 | 38° | 16° | 27° | — | — |
| 2004 | 52° | 34° | 43° | — | — |
| 2003 | 47° | 29° | 38° | 0.03" | 0.1" |
| 2002 | 62° | 32° | 47° | — | — |
| 2001 | 45° | 25° | 35° | — | — |
| 2000 | 45° | 30° | 37° | 0.03" | 0.2" |
| 1999 | 43° | 24° | 33° | — | — |
| 1998 | 46° | 27° | 36° | — | — |
| 1997 | 59° | 41° | 50° | — | — |
| 1996 | 40° | 13° | 26° | — | — |
| 1995 | 57° | 26° | 42° | — | — |
| 1994 | 47° | 16° | 31° | — | — |
| 1993 | 34° | 19° | 26° | — | — |
| 1992 | 38° | 15° | 26° | — | — |
| 1991 | 49° | 23° | 36° | — | — |
| 1990 | 42° | 20° | 31° | — | — |
| 1989 | 46° | 2° | 24° | — | — |
| 1988 | 26° | 14° | 20° | 1.93" | 8.8" |
| 1987 | 35° | 0° | 18° | — | — |
| 1986 | 51° | 25° | 38° | — | — |
| 1985 | 48° | 15° | 32° | — | — |
| 1984 | 41° | 14° | 28° | 0.03" | — |
| 1983 | 33° | 22° | 27° | 0.13" | 0.5" |
| 1982 | 44° | 25° | 34° | — | — |
| 1981 | 46° | 26° | 36° | — | — |
| 1980 | 65° | 33° | 49° | — | — |
| 1979 | 62° | 42° | 52° | — | — |
| 1978 | 45° | 12° | 28° | — | — |
| 1977 | 63° | 40° | 51° | — | — |
| 1976 | 53° | 27° | 40° | — | — |
| 1975 | 49° | 0° | 24° | — | — |
| 1974 | 39° | 21° | 30° | — | — |
| 1973 | 42° | 24° | 33° | — | — |
| 1972 | 34° | 2° | 18° | — | — |
| 1971 | 36° | 17° | 26° | — | — |
55 years of data from BOULDER MUNI AP