Weather on December 23
Longmont, CO
55 Years of Data
Avg High
43°F
Avg Low
16°F
Warmest
2025
55°F avg
Coldest
1990
-12°F avg
About This Date
December 23rd in Longmont, CO typically brings chilly winter weather, with average highs around 43°F and lows near 16°F — a 27°F daily swing. Over 55 years of records, the warmest December 23rd was in 2025 (55°F average), while the coldest was 1990 (-12°F) — a 67°F range across recorded history. Precipitation has occurred on 13% of recorded December 23rd dates, with snow falling 11% of the time (heaviest snowfall: 5.9"). The last decade has been 9.8°F warmer on this date compared to 20-30 years ago.
The last decade has been 9.8°F warmer on this date compared to 20-30 years ago.
Planning for December 23rd in Longmont, CO? Bring layers as temperatures can vary throughout the day.
Warming Trend
1.1°F per decade on this date
| Year | High | Low | Avg | Precip | Snow |
|---|---|---|---|---|---|
| 2025warmest | 77° | 34° | 55° | — | — |
| 2024 | 50° | 36° | 43° | — | — |
| 2023 | 57° | 29° | 43° | — | — |
| 2022 | -2° | -15° | -8° | — | — |
| 2021 | 62° | 36° | 49° | — | — |
| 2020 | 65° | 23° | 44° | 0.03" | — |
| 2019 | 57° | 28° | 43° | — | — |
| 2018 | 42° | 13° | 27° | — | — |
| 2017 | 35° | 7° | 21° | — | — |
| 2016 | 59° | 24° | 42° | — | — |
| 2015 | 41° | 20° | 30° | — | 0.1" |
| 2014 | 40° | 22° | 31° | — | — |
| 2013 | 43° | 19° | 31° | 0.03" | 0.2" |
| 2012 | 51° | 25° | 38° | — | — |
| 2011 | 44° | 5° | 25° | — | — |
| 2010 | 50° | 19° | 35° | — | — |
| 2009 | 36° | 22° | 29° | 1.14" | 5.9" |
| 2008 | 40° | 12° | 26° | — | — |
| 2007 | 44° | 15° | 30° | — | — |
| 2006 | 44° | 15° | 30° | — | — |
| 2005 | 59° | 43° | 51° | — | — |
| 2004 | 18° | -3° | 8° | 0.36" | 2.4" |
| 2003 | 44° | 16° | 30° | — | — |
| 2002 | 42° | 15° | 29° | — | — |
| 2001 | 45° | 6° | 25° | — | — |
| 2000 | 55° | 13° | 34° | — | — |
| 1999 | 45° | 18° | 31° | — | — |
| 1998 | 14° | -19° | -2° | — | — |
| 1997 | 39° | 11° | 25° | — | — |
| 1996 | 46° | 14° | 30° | — | — |
| 1995 | 27° | 1° | 14° | — | — |
| 1994 | 60° | 19° | 40° | — | — |
| 1993 | 33° | 11° | 22° | — | — |
| 1992 | 43° | 12° | 27° | — | — |
| 1991 | 48° | 27° | 37° | — | — |
| 1990coldest | -2° | -22° | -12° | — | — |
| 1989 | 12° | -25° | -6° | — | — |
| 1988 | 40° | 7° | 23° | — | — |
| 1987 | 41° | 19° | 30° | 0.05" | 0.5" |
| 1986 | 48° | 14° | 31° | — | — |
| 1985 | 42° | 25° | 33° | — | — |
| 1984 | 49° | 12° | 30° | — | — |
| 1983 | -3° | -12° | -7° | 0.18" | 2" |
| 1982 | 61° | 28° | 44° | — | — |
| 1981 | 35° | 0° | 18° | — | — |
| 1980 | 63° | 32° | 47° | — | — |
| 1979 | 39° | 30° | 35° | 0.76" | — |
| 1978 | 45° | 18° | 31° | — | — |
| 1977 | 49° | 39° | 44° | — | — |
| 1976 | 43° | 11° | 27° | — | — |
| 1975 | 47° | 20° | 33° | — | — |
| 1974 | 36° | 19° | 27° | — | — |
| 1973 | 42° | 25° | 33° | — | — |
| 1972 | 59° | 23° | 41° | — | — |
| 1971 | 57° | 22° | 39° | — | — |
55 years of data from LONGMONT 2 ESE