Weather on May 17
Longmont, CO
55 Years of Data
About This Date
May 17th in Longmont, CO typically brings pleasant spring weather, with average highs around 75°F and lows near 44°F — a 31°F daily swing. Over 55 years of records, the warmest May 17th was in 1996 (76°F average), while the coldest was 2016 (40°F) — a 36°F range across recorded history. Precipitation has occurred on 36% of recorded May 17th dates, with snow falling 2% of the time. The last decade has been 1.6°F cooler on this date compared to 20-30 years ago.
The last decade has been 1.6°F cooler on this date compared to 20-30 years ago.
Planning for May 17th in Longmont, CO? Great weather for outdoor activities. Consider bringing rain gear or an umbrella.
| Year | High | Low | Avg | Precip | Snow |
|---|---|---|---|---|---|
| 2026 | 80° | 51° | 66° | — | — |
| 2025 | 71° | 47° | 59° | — | — |
| 2024 | 78° | 45° | 61° | — | — |
| 2023 | 82° | 45° | 63° | 0.38" | — |
| 2022 | 85° | 45° | 65° | — | — |
| 2021 | 62° | 52° | 57° | 0.03" | — |
| 2020 | 74° | 44° | 59° | — | — |
| 2019 | 86° | 50° | 68° | — | — |
| 2018 | 79° | 52° | 65° | — | — |
| 2017 | 73° | 38° | 55° | 0.03" | — |
| 2016coldest | 45° | 36° | 40° | 0.36" | — |
| 2015 | 69° | 42° | 56° | 0.2" | — |
| 2014 | 66° | 41° | 54° | 0.33" | — |
| 2013 | 86° | 48° | 67° | — | — |
| 2012 | 80° | 46° | 63° | 0.05" | — |
| 2011 | 59° | 39° | 49° | 0.1" | — |
| 2010 | 74° | 40° | 57° | — | — |
| 2008 | 76° | 48° | 62° | — | — |
| 2007 | 72° | 45° | 58° | — | — |
| 2006 | 82° | 46° | 64° | — | — |
| 2005 | 75° | 54° | 64° | — | — |
| 2004 | 81° | 48° | 64° | — | — |
| 2003 | 79° | 52° | 65° | — | — |
| 2002 | 54° | 39° | 46° | 1.14" | — |
| 2001 | 85° | 48° | 66° | — | — |
| 2000 | 87° | 44° | 66° | — | — |
| 1999 | 60° | 29° | 44° | 0.76" | — |
| 1998 | 81° | 38° | 59° | — | — |
| 1997 | 85° | 43° | 64° | — | — |
| 1996warmest | 96° | 56° | 76° | — | — |
| 1995 | 68° | 44° | 56° | 1.63" | — |
| 1994 | 90° | 47° | 68° | — | — |
| 1993 | 69° | 47° | 58° | 0.08" | — |
| 1992 | 85° | 40° | 62° | — | — |
| 1991 | 62° | 44° | 53° | 0.66" | — |
| 1990 | 61° | 37° | 49° | — | — |
| 1989 | 65° | 39° | 52° | — | — |
| 1988 | 93° | 48° | 71° | — | — |
| 1987 | 85° | 52° | 68° | 0.13" | — |
| 1986 | 59° | 38° | 48° | 0.05" | — |
| 1985 | 67° | 48° | 57° | 0.03" | — |
| 1984 | 82° | 43° | 62° | — | — |
| 1983 | 57° | 32° | 45° | 3.45" | 1" |
| 1982 | 64° | 43° | 53° | 0.03" | — |
| 1981 | 52° | 44° | 48° | 1.52" | — |
| 1980 | 55° | 40° | 47° | 0.3" | — |
| 1979 | 84° | 46° | 65° | — | — |
| 1978 | 88° | 57° | 72° | — | — |
| 1977 | 78° | 44° | 61° | — | — |
| 1976 | 60° | 33° | 47° | — | — |
| 1975 | 87° | 49° | 68° | — | — |
| 1974 | 73° | 48° | 61° | — | — |
| 1973 | 78° | 45° | 61° | — | — |
| 1972 | 88° | 42° | 65° | — | — |
| 1971 | 86° | 41° | 64° | — | — |
Longmont, CO Temperature Range by Month
Average monthly highs and lows. The shaded band shows the typical daily temperature range.
Longmont, CO Monthly Precipitation
Average rainfall and snowfall per month, in inches.
Longmont, CO Daily Temperature Calendar
Average daily high temperature for every day of the year. Each cell is the climatological mean for that calendar day across 55 years of NOAA data.
Best Time to Visit Longmont, CO
Longmont, CO has no months that meet our "pleasant" threshold — every season has tradeoffs.