Weather on January 4
Boulder, CO
55 Years of Data
Avg High
42°F
Avg Low
18°F
Warmest
2026
55°F avg
Coldest
1971
3°F avg
About This Date
January 4th in Boulder, CO typically brings chilly winter weather, with average highs around 42°F and lows near 18°F. Over 56 years of records, the warmest January 4th was in 2026 (55°F average), while the coldest was 1971 (3°F) — a 52°F range across recorded history. Precipitation has occurred on 18% of recorded January 4th dates, with snow falling 18% of the time (heaviest snowfall: 10.7"). The last decade has been 1.5°F warmer on this date compared to 20-30 years ago.
The last decade has been 1.5°F warmer on this date compared to 20-30 years ago.
Planning for January 4th in Boulder, CO? Bring layers as temperatures can vary throughout the day.
Warming Trend
2.6°F per decade on this date
| Year | High | Low | Avg | Precip | Snow |
|---|---|---|---|---|---|
| 2026warmest | 70° | 41° | 55° | — | — |
| 2025 | 27° | 21° | 24° | — | — |
| 2024 | 32° | 25° | 29° | — | — |
| 2023 | 36° | 10° | 23° | — | — |
| 2022 | 49° | 30° | 39° | — | — |
| 2021 | 57° | 32° | 45° | — | — |
| 2020 | 64° | 28° | 46° | — | — |
| 2019 | 59° | 28° | 44° | — | — |
| 2018 | 52° | 24° | 38° | — | — |
| 2017 | 12° | -1° | 6° | — | — |
| 2016 | 45° | 21° | 33° | — | — |
| 2015 | 25° | 0° | 12° | 0.03" | 0.4" |
| 2014 | 52° | 19° | 35° | 1.47" | 10.7" |
| 2013 | 49° | 19° | 34° | — | — |
| 2012 | 61° | 24° | 42° | — | — |
| 2011 | 44° | 10° | 27° | — | — |
| 2010 | 40° | 16° | 28° | — | — |
| 2009 | 24° | 13° | 18° | 0.08" | 2.4" |
| 2008 | 56° | 41° | 48° | — | — |
| 2007 | 55° | 25° | 40° | — | — |
| 2006 | 48° | 29° | 38° | — | — |
| 2005 | 27° | 13° | 20° | 0.18" | 1.7" |
| 2004 | 30° | 16° | 23° | 0.05" | 0.3" |
| 2003 | 56° | 37° | 46° | — | — |
| 2002 | 43° | 29° | 36° | 0.2" | 0.7" |
| 2001 | 65° | 34° | 49° | — | — |
| 2000 | 49° | 13° | 31° | — | — |
| 1999 | 43° | 11° | 27° | — | — |
| 1998 | 48° | 20° | 34° | — | — |
| 1997 | 44° | 29° | 36° | — | — |
| 1996 | 45° | 15° | 30° | 0.89" | 5.1" |
| 1995 | 23° | 1° | 12° | — | — |
| 1994 | 54° | 22° | 38° | — | — |
| 1993 | 36° | 6° | 21° | — | — |
| 1992 | 53° | 22° | 37° | — | — |
| 1991 | 27° | 14° | 20° | — | — |
| 1990 | 34° | 2° | 18° | — | — |
| 1989 | 56° | 31° | 43° | — | — |
| 1988 | 17° | -2° | 8° | — | — |
| 1987 | 61° | 28° | 44° | — | — |
| 1986 | 37° | 18° | 27° | — | — |
| 1985 | 55° | 30° | 43° | — | — |
| 1984 | 57° | 35° | 46° | — | — |
| 1983 | 44° | 9° | 26° | — | — |
| 1982 | 41° | 23° | 32° | — | — |
| 1981 | 58° | 28° | 43° | — | — |
| 1980 | 43° | 31° | 37° | — | — |
| 1979 | 22° | 8° | 15° | 0.18" | 1" |
| 1978 | 51° | 29° | 40° | — | — |
| 1977 | 35° | 18° | 26° | — | — |
| 1976 | 39° | 3° | 21° | — | — |
| 1975 | 48° | 9° | 28° | — | — |
| 1974 | 19° | -6° | 7° | — | — |
| 1973 | 16° | 2° | 9° | 0.3" | 3.1" |
| 1972 | 17° | -12° | 3° | 0.05" | 0.5" |
| 1971coldest | 8° | -2° | 3° | — | — |
56 years of data from BOULDER MUNI AP