Weather on January 18
Boulder, CO
55 Years of Data
Avg High
48°F
Avg Low
23°F
Warmest
1975
50°F avg
Coldest
1984
0°F avg
About This Date
January 18th in Boulder, CO typically brings chilly winter weather, with average highs around 48°F and lows near 23°F — a 25°F daily swing. Over 56 years of records, the warmest January 18th was in 1975 (50°F average), while the coldest was 1984 (0°F) — a 50°F range across recorded history. Precipitation has occurred on 14% of recorded January 18th dates, with snow falling 9% of the time (heaviest snowfall: 4.2"). The last decade has been 2.0°F warmer on this date compared to 20-30 years ago.
The last decade has been 2.0°F warmer on this date compared to 20-30 years ago.
Planning for January 18th in Boulder, CO? Bring layers as temperatures can vary throughout the day.
| Year | High | Low | Avg | Precip | Snow |
|---|---|---|---|---|---|
| 2026 | 55° | 28° | 42° | — | — |
| 2025 | 19° | 7° | 13° | — | — |
| 2024 | 48° | 12° | 30° | — | — |
| 2023 | 30° | 23° | 27° | — | — |
| 2022 | 50° | 34° | 42° | — | — |
| 2021 | 45° | 28° | 37° | — | — |
| 2020 | 41° | 19° | 30° | — | — |
| 2019 | 48° | 28° | 38° | — | — |
| 2018 | 63° | 24° | 43° | — | — |
| 2017 | 54° | 31° | 42° | — | — |
| 2016 | 54° | 22° | 38° | — | — |
| 2015 | 64° | 34° | 49° | — | — |
| 2014 | 57° | 28° | 43° | — | — |
| 2013 | 59° | 27° | 43° | — | — |
| 2012 | 49° | 20° | 34° | — | — |
| 2011 | 51° | 31° | 41° | — | — |
| 2010 | 50° | 29° | 39° | — | — |
| 2009 | 65° | 29° | 47° | — | — |
| 2008 | 30° | 18° | 24° | 0.03" | 0.2" |
| 2007 | 33° | 16° | 24° | — | — |
| 2006 | 59° | 33° | 46° | — | — |
| 2005 | 60° | 28° | 44° | — | — |
| 2004 | 44° | 19° | 32° | — | — |
| 2003 | 51° | 18° | 34° | — | — |
| 2002 | 32° | 13° | 22° | — | — |
| 2001 | 38° | 11° | 24° | — | — |
| 2000 | 51° | 35° | 43° | — | — |
| 1999 | 59° | 21° | 40° | — | — |
| 1998 | 50° | 33° | 42° | — | — |
| 1997 | 55° | 19° | 37° | — | — |
| 1996 | 21° | -4° | 9° | — | — |
| 1995 | 40° | 15° | 27° | — | — |
| 1994 | 55° | 10° | 33° | — | — |
| 1993 | 39° | 17° | 28° | — | — |
| 1992 | 33° | 17° | 25° | 0.03" | 0.1" |
| 1991 | 49° | 20° | 34° | — | — |
| 1990 | 42° | 13° | 27° | — | — |
| 1989 | 58° | 26° | 42° | — | — |
| 1988 | 33° | 20° | 26° | 0.61" | 4.2" |
| 1987 | 37° | 15° | 26° | — | — |
| 1986 | 59° | 35° | 47° | — | — |
| 1985 | 56° | 30° | 43° | — | — |
| 1984coldest | 19° | -19° | 0° | 0.05" | — |
| 1983 | 40° | 20° | 30° | — | — |
| 1982 | 53° | 30° | 42° | — | — |
| 1981 | 52° | 19° | 35° | — | — |
| 1980 | 48° | 29° | 38° | 0.56" | 3.7" |
| 1979 | 48° | 25° | 36° | — | — |
| 1978 | 37° | 17° | 27° | 0.15" | 1.1" |
| 1977 | 56° | 19° | 37° | — | — |
| 1976 | 62° | 34° | 48° | — | — |
| 1975warmest | 60° | 40° | 50° | — | — |
| 1974 | 51° | 33° | 42° | 1.09" | — |
| 1973 | 47° | 28° | 37° | — | — |
| 1972 | 55° | 41° | 48° | — | — |
| 1971 | 46° | 33° | 40° | 0.3" | — |
56 years of data from BOULDER MUNI AP