Weather on April 18
Longmont, CO
55 Years of Data
Avg High
66°F
Avg Low
33°F
Warmest
1987
63°F avg
Coldest
2013
22°F avg
About This Date
April 18th in Longmont, CO typically brings mild spring weather, with average highs around 66°F and lows near 33°F — a 33°F daily swing. Over 55 years of records, the warmest April 18th was in 1987 (63°F average), while the coldest was 2013 (22°F) — a 41°F range across recorded history. Precipitation has occurred on 22% of recorded April 18th dates, with snow falling 9% of the time (heaviest snowfall: 6"). The last decade has been 4.0°F cooler on this date compared to 20-30 years ago.
The last decade has been 4.0°F cooler on this date compared to 20-30 years ago.
Planning for April 18th in Longmont, CO? Great weather for outdoor activities.
Cooling Trend
0.9°F per decade on this date
| Year | High | Low | Avg | Precip | Snow |
|---|---|---|---|---|---|
| 2025 | 72° | 29° | 50° | 0.46" | 1.8" |
| 2024 | 75° | 32° | 54° | — | — |
| 2023 | 76° | 40° | 58° | — | — |
| 2022 | 65° | 28° | 46° | — | — |
| 2021 | 49° | 29° | 39° | — | — |
| 2020 | 44° | 13° | 28° | — | — |
| 2019 | 66° | 36° | 51° | — | — |
| 2018 | 71° | 35° | 53° | — | — |
| 2017 | 77° | 42° | 60° | — | — |
| 2016 | 44° | 31° | 37° | 0.03" | 0.1" |
| 2015 | 54° | 36° | 45° | 0.05" | — |
| 2014 | 76° | 38° | 57° | — | — |
| 2013coldest | 33° | 10° | 22° | 0.08" | 1.1" |
| 2012 | 70° | 37° | 53° | — | — |
| 2011 | 65° | 40° | 52° | — | — |
| 2010 | 69° | 34° | 51° | — | — |
| 2009 | 42° | 32° | 37° | 2.9" | 1.8" |
| 2008 | 68° | 29° | 48° | — | — |
| 2007 | 64° | 34° | 49° | — | — |
| 2006 | 75° | 37° | 56° | — | — |
| 2005 | 75° | 40° | 57° | — | — |
| 2004 | 77° | 45° | 61° | — | — |
| 2003 | 65° | 38° | 51° | 0.25" | — |
| 2002 | 81° | 22° | 51° | — | — |
| 2001 | 64° | 37° | 51° | — | — |
| 2000 | 80° | 28° | 54° | — | — |
| 1999 | 61° | 27° | 44° | — | — |
| 1998 | 56° | 23° | 39° | 0.99" | — |
| 1997 | 78° | 30° | 54° | — | — |
| 1996 | 73° | 35° | 54° | — | — |
| 1995 | 46° | 28° | 37° | 0.3" | — |
| 1994 | 81° | 44° | 62° | — | — |
| 1993 | 70° | 39° | 54° | — | — |
| 1992 | 69° | 39° | 54° | — | — |
| 1991 | 62° | 35° | 49° | — | — |
| 1990 | 46° | 30° | 38° | — | — |
| 1989 | 67° | 22° | 44° | — | — |
| 1988 | 57° | 30° | 44° | — | — |
| 1987warmest | 84° | 41° | 63° | — | — |
| 1986 | 55° | 36° | 45° | — | — |
| 1985 | 79° | 44° | 61° | 0.05" | — |
| 1984 | 78° | 39° | 59° | — | — |
| 1983 | 67° | 26° | 46° | — | — |
| 1982 | 66° | 37° | 52° | — | — |
| 1981 | 79° | 43° | 61° | — | — |
| 1980 | 68° | 30° | 49° | — | — |
| 1979 | 81° | 40° | 60° | — | — |
| 1978 | 52° | 31° | 41° | — | — |
| 1977 | 68° | 36° | 52° | 0.05" | — |
| 1976 | 42° | 28° | 35° | 0.1" | — |
| 1975 | 59° | 26° | 43° | 1.6" | 6" |
| 1974 | 70° | 34° | 52° | — | — |
| 1973 | 70° | 37° | 53° | — | — |
| 1972 | 75° | 36° | 55° | — | — |
| 1971 | 80° | 39° | 60° | — | — |
55 years of data from LONGMONT 2 ESE