Weather on January 18
Longmont, CO
55 Years of Data
Avg High
46°F
Avg Low
18°F
Warmest
2015
49°F avg
Coldest
1984
-11°F avg
About This Date
January 18th in Longmont, CO typically brings chilly winter weather, with average highs around 46°F and lows near 18°F — a 28°F daily swing. Over 56 years of records, the warmest January 18th was in 2015 (49°F average), while the coldest was 1984 (-11°F) — a 60°F range across recorded history. Precipitation has occurred on 14% of recorded January 18th dates, with snow falling 9% of the time (heaviest snowfall: 4.8"). The last decade has been 5.3°F warmer on this date compared to 20-30 years ago.
The last decade has been 5.3°F warmer on this date compared to 20-30 years ago.
Planning for January 18th in Longmont, CO? Bring layers as temperatures can vary throughout the day.
Warming Trend
0.9°F per decade on this date
| Year | High | Low | Avg | Precip | Snow |
|---|---|---|---|---|---|
| 2026 | 40° | 15° | 27° | — | — |
| 2025 | 51° | 11° | 31° | 0.61" | 4" |
| 2024 | 42° | 17° | 30° | — | — |
| 2023 | 35° | 22° | 28° | 1.19" | 4.8" |
| 2022 | 48° | 23° | 36° | — | — |
| 2021 | 49° | 29° | 39° | — | — |
| 2020 | 53° | 19° | 36° | — | — |
| 2019 | 55° | 30° | 43° | — | — |
| 2018 | 53° | 8° | 31° | — | — |
| 2017 | 48° | 14° | 31° | — | — |
| 2016 | 54° | 22° | 38° | — | — |
| 2015warmest | 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 | 49° | 16° | 32° | — | — |
| 2003 | 45° | 15° | 30° | — | — |
| 2002 | 32° | 5° | 19° | — | — |
| 2001 | 26° | -10° | 8° | — | — |
| 2000 | 60° | 27° | 43° | — | — |
| 1999 | 36° | 17° | 26° | — | — |
| 1998 | 51° | 26° | 39° | — | — |
| 1997 | 34° | 12° | 23° | — | — |
| 1996 | 43° | -6° | 19° | 0.33" | — |
| 1995 | 44° | 13° | 28° | — | — |
| 1994 | 23° | 6° | 15° | — | — |
| 1993 | 32° | 20° | 26° | — | — |
| 1992 | 32° | 6° | 19° | — | — |
| 1991 | 39° | 14° | 27° | — | — |
| 1990 | 42° | 13° | 27° | — | — |
| 1989 | 57° | 15° | 36° | — | — |
| 1988 | 48° | 17° | 33° | — | — |
| 1987 | 29° | -11° | 9° | — | — |
| 1986 | 48° | 28° | 38° | — | — |
| 1985 | 58° | 17° | 37° | — | — |
| 1984coldest | 8° | -30° | -11° | 0.13" | 1" |
| 1983 | 40° | 20° | 30° | — | — |
| 1982 | 63° | 22° | 42° | — | — |
| 1981 | 30° | 8° | 19° | — | — |
| 1980 | 43° | 21° | 32° | — | — |
| 1979 | 39° | 18° | 28° | — | — |
| 1978 | 39° | 3° | 21° | 0.13" | 1" |
| 1977 | 52° | 18° | 35° | — | — |
| 1976 | 56° | 25° | 40° | — | — |
| 1975 | 62° | 18° | 40° | — | — |
| 1974 | 48° | 33° | 41° | 0.74" | — |
| 1973 | 45° | 26° | 35° | — | — |
| 1972 | 57° | 21° | 39° | — | — |
| 1971 | 58° | 35° | 46° | 0.08" | — |
56 years of data from LONGMONT 2 ESE