Weather on January 21
Boulder, CO
55 Years of Data
Avg High
46°F
Avg Low
22°F
Warmest
2009
55°F avg
Coldest
1985
15°F avg
About This Date
January 21st in Boulder, CO typically brings chilly winter weather, with average highs around 46°F and lows near 22°F. Over 56 years of records, the warmest January 21st was in 2009 (55°F average), while the coldest was 1985 (15°F) — a 40°F range across recorded history. Precipitation has occurred on 18% of recorded January 21st dates, with snow falling 18% of the time (heaviest snowfall: 7.1"). The last decade has been 5.8°F cooler on this date compared to 20-30 years ago.
The last decade has been 5.8°F cooler on this date compared to 20-30 years ago.
Planning for January 21st in Boulder, CO? Bring layers as temperatures can vary throughout the day.
| Year | High | Low | Avg | Precip | Snow |
|---|---|---|---|---|---|
| 2026 | 54° | 21° | 37° | — | — |
| 2025 | 46° | -6° | 20° | — | — |
| 2024 | 46° | 25° | 36° | — | — |
| 2023 | 34° | 18° | 26° | — | — |
| 2022 | 34° | 25° | 30° | — | — |
| 2021 | 46° | 30° | 38° | — | — |
| 2020 | 50° | 32° | 41° | — | — |
| 2019 | 48° | 27° | 38° | — | — |
| 2018 | 32° | 24° | 28° | 1.7" | 7.1" |
| 2017 | 40° | 25° | 32° | — | — |
| 2016 | 45° | 23° | 34° | — | — |
| 2015 | 36° | 25° | 30° | 0.33" | 2.7" |
| 2014 | 62° | 22° | 42° | — | — |
| 2013 | 56° | 16° | 36° | — | — |
| 2012 | 64° | 25° | 44° | — | — |
| 2011 | 46° | 24° | 35° | — | — |
| 2010 | 40° | 23° | 31° | — | — |
| 2009warmest | 70° | 40° | 55° | — | — |
| 2008 | 29° | 7° | 18° | 0.18" | 3.1" |
| 2007 | 29° | 21° | 25° | 0.53" | 2.8" |
| 2006 | 44° | 14° | 29° | — | — |
| 2005 | 65° | 41° | 53° | — | — |
| 2004 | 44° | 16° | 30° | 0.05" | 0.2" |
| 2003 | 54° | 22° | 38° | — | — |
| 2002 | 50° | 31° | 40° | — | — |
| 2001 | 45° | 18° | 31° | — | — |
| 2000 | 53° | 31° | 42° | — | — |
| 1999 | 46° | 29° | 37° | 0.13" | 0.6" |
| 1998 | 36° | 17° | 26° | — | — |
| 1997 | 56° | 36° | 46° | — | — |
| 1996 | 50° | 34° | 42° | — | — |
| 1995 | 43° | 16° | 29° | — | — |
| 1994 | 58° | 24° | 41° | — | — |
| 1993 | 52° | 41° | 46° | — | — |
| 1992 | 53° | 26° | 40° | — | — |
| 1991 | 30° | 6° | 18° | — | — |
| 1990 | 43° | 0° | 21° | — | — |
| 1989 | 61° | 32° | 46° | — | — |
| 1988 | 33° | 12° | 23° | — | — |
| 1987 | 38° | 11° | 24° | — | — |
| 1986 | 55° | 31° | 43° | — | — |
| 1985coldest | 19° | 10° | 15° | 0.03" | 0.2" |
| 1984 | 42° | 16° | 29° | — | — |
| 1983 | 30° | 15° | 23° | — | — |
| 1982 | 39° | 19° | 29° | — | — |
| 1981 | 61° | 26° | 43° | — | — |
| 1980 | 42° | 14° | 28° | — | — |
| 1979 | 52° | 23° | 37° | — | — |
| 1978 | 36° | 17° | 26° | — | — |
| 1977 | 45° | 22° | 33° | — | — |
| 1976 | 53° | 23° | 38° | — | — |
| 1975 | 50° | 21° | 36° | 0.89" | 4.3" |
| 1974 | 44° | 25° | 34° | 0.43" | 1.9" |
| 1973 | 41° | 13° | 27° | 0.48" | 1.1" |
| 1972 | 56° | 36° | 46° | — | — |
| 1971 | 60° | 35° | 48° | — | — |
56 years of data from BOULDER MUNI AP