Weather on December 19
Boulder, CO
55 Years of Data
Avg High
46°F
Avg Low
21°F
Warmest
2025
57°F avg
Coldest
1989
3°F avg
About This Date
December 19th in Boulder, CO typically brings chilly winter weather, with average highs around 46°F and lows near 21°F — a 25°F daily swing. Over 55 years of records, the warmest December 19th was in 2025 (57°F average), while the coldest was 1989 (3°F) — a 54°F range across recorded history. Precipitation has occurred on 13% of recorded December 19th dates, with snow falling 13% of the time (heaviest snowfall: 3.7"). The last decade has been 11.5°F warmer on this date compared to 20-30 years ago.
The last decade has been 11.5°F warmer on this date compared to 20-30 years ago.
Planning for December 19th in Boulder, CO? Bring layers as temperatures can vary throughout the day.
Warming Trend
1.5°F per decade on this date
| Year | High | Low | Avg | Precip | Snow |
|---|---|---|---|---|---|
| 2025warmest | 70° | 45° | 57° | — | — |
| 2024 | 61° | 32° | 46° | — | — |
| 2023 | 64° | 43° | 53° | — | — |
| 2022 | 46° | 18° | 32° | — | — |
| 2021 | 61° | 21° | 41° | — | — |
| 2020 | 46° | 19° | 33° | — | — |
| 2019 | 46° | 28° | 37° | — | — |
| 2018 | 52° | 30° | 41° | — | — |
| 2017 | 51° | 28° | 40° | — | — |
| 2016 | 48° | 5° | 27° | — | — |
| 2015 | 53° | 25° | 39° | — | — |
| 2014 | 50° | 21° | 36° | — | — |
| 2013 | 59° | 31° | 45° | — | — |
| 2012 | 38° | 11° | 24° | 0.41" | 3.7" |
| 2011 | 55° | 24° | 40° | 0.1" | 0.7" |
| 2010 | 55° | 21° | 38° | — | — |
| 2009 | 45° | 18° | 31° | — | — |
| 2008 | 47° | 21° | 34° | — | — |
| 2007 | 52° | 24° | 38° | — | — |
| 2006 | 39° | 19° | 29° | — | — |
| 2005 | 37° | 5° | 21° | — | — |
| 2004 | 63° | 27° | 45° | — | — |
| 2003 | 55° | 24° | 40° | — | — |
| 2002 | 36° | 23° | 29° | — | — |
| 2001 | 51° | 18° | 34° | — | — |
| 2000 | 56° | 23° | 39° | — | — |
| 1999 | 42° | 12° | 27° | — | — |
| 1998 | 21° | 1° | 11° | 0.41" | 2.8" |
| 1997 | 40° | 26° | 33° | — | — |
| 1996 | 31° | -4° | 13° | — | — |
| 1995 | 36° | 12° | 24° | — | — |
| 1994 | 48° | 23° | 36° | — | — |
| 1993 | 35° | 19° | 27° | 0.36" | 2.7" |
| 1992 | 24° | 1° | 13° | 0.36" | 2.5" |
| 1991 | 47° | 22° | 34° | — | — |
| 1990 | 39° | 2° | 20° | 0.2" | 2.3" |
| 1989coldest | 14° | -9° | 3° | — | — |
| 1988 | 52° | 35° | 43° | — | — |
| 1987 | 36° | 20° | 28° | — | — |
| 1986 | 52° | 26° | 39° | — | — |
| 1985 | 49° | 28° | 38° | — | — |
| 1984 | 55° | 22° | 38° | — | — |
| 1983 | 21° | 1° | 11° | — | — |
| 1982 | 55° | 24° | 40° | — | — |
| 1981 | 53° | 24° | 39° | — | — |
| 1980 | 39° | 17° | 28° | — | — |
| 1979 | 69° | 33° | 51° | — | — |
| 1978 | 41° | 22° | 31° | — | — |
| 1977 | 43° | 22° | 32° | — | — |
| 1976 | 44° | 24° | 34° | — | — |
| 1975 | 54° | 22° | 38° | — | — |
| 1974 | 41° | 33° | 37° | — | — |
| 1973 | 29° | 9° | 19° | 0.03" | 0.2" |
| 1972 | 53° | 38° | 45° | — | — |
| 1971 | 52° | 30° | 41° | — | — |
55 years of data from BOULDER MUNI AP