Weather on January 21
Longmont, CO
55 Years of Data
Avg High
44°F
Avg Low
16°F
Warmest
2009
55°F avg
Coldest
2025
-1°F avg
About This Date
January 21st in Longmont, CO typically brings chilly winter weather, with average highs around 44°F and lows near 16°F — a 28°F daily swing. Over 56 years of records, the warmest January 21st was in 2009 (55°F average), while the coldest was 2025 (-1°F) — a 56°F range across recorded history. Precipitation has occurred on 11% of recorded January 21st dates, with snow falling 11% of the time (heaviest snowfall: 3.1"). The last decade has been 7.3°F cooler on this date compared to 20-30 years ago.
The last decade has been 7.3°F cooler on this date compared to 20-30 years ago.
Planning for January 21st in Longmont, CO? Bring layers as temperatures can vary throughout the day.
Warming Trend
0.6°F per decade on this date
| Year | High | Low | Avg | Precip | Snow |
|---|---|---|---|---|---|
| 2026 | 45° | 15° | 30° | — | — |
| 2025coldest | 9° | -11° | -1° | — | — |
| 2024 | 38° | 19° | 28° | — | — |
| 2023 | 34° | 13° | 23° | — | — |
| 2022 | 26° | 19° | 23° | — | — |
| 2021 | 61° | 16° | 38° | — | — |
| 2020 | 51° | 15° | 33° | — | — |
| 2019 | 48° | 22° | 35° | — | — |
| 2018 | 47° | 27° | 37° | 0.64" | 2.2" |
| 2017 | 47° | 18° | 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 | 35° | 19° | 27° | — | — |
| 2003 | 63° | 25° | 44° | — | — |
| 2002 | 44° | 21° | 33° | — | — |
| 2001 | 45° | 10° | 27° | — | — |
| 2000 | 49° | 15° | 32° | — | — |
| 1999 | 56° | 18° | 37° | — | — |
| 1998 | 50° | 10° | 30° | — | — |
| 1997 | 53° | 21° | 37° | — | — |
| 1996 | 52° | 23° | 37° | — | — |
| 1995 | 47° | 12° | 29° | — | — |
| 1994 | 45° | 12° | 28° | — | — |
| 1993 | 52° | 5° | 28° | — | — |
| 1992 | 42° | 12° | 27° | — | — |
| 1991 | 28° | 4° | 16° | — | — |
| 1990 | 43° | 0° | 21° | — | — |
| 1989 | 50° | 15° | 33° | — | — |
| 1988 | 30° | -9° | 11° | — | — |
| 1987 | 28° | -8° | 10° | — | — |
| 1986 | 45° | 21° | 33° | — | — |
| 1985 | 24° | 7° | 15° | — | — |
| 1984 | 15° | -16° | 0° | — | — |
| 1983 | 30° | 15° | 23° | — | — |
| 1982 | 39° | 19° | 29° | — | — |
| 1981 | 47° | 18° | 32° | — | — |
| 1980 | 26° | 2° | 14° | — | — |
| 1979 | 41° | 19° | 30° | — | — |
| 1978 | 26° | 7° | 16° | — | — |
| 1977 | 56° | 17° | 36° | — | — |
| 1976 | 51° | 14° | 33° | — | — |
| 1975 | 61° | 22° | 41° | 0.28" | 2" |
| 1974 | 44° | 27° | 35° | — | — |
| 1973 | 31° | 8° | 19° | 0.1" | 1" |
| 1972 | 58° | 27° | 42° | — | — |
| 1971 | 65° | 35° | 50° | — | — |
56 years of data from LONGMONT 2 ESE