Weather on May 20
Longmont, CO
55 Years of Data
Avg High
73°F
Avg Low
45°F
Warmest
2006
75°F avg
Coldest
2015
39°F avg
About This Date
May 20th in Longmont, CO typically brings pleasant spring weather, with average highs around 73°F and lows near 45°F — a 28°F daily swing. Over 54 years of records, the warmest May 20th was in 2006 (75°F average), while the coldest was 2015 (39°F) — a 36°F range across recorded history. Rain or other precipitation has occurred on about 33% of May 20th dates historically, with the wettest May 20th recording 2.54" of rain. The last decade has been 3.4°F cooler on this date compared to 20-30 years ago.
The last decade has been 3.4°F cooler on this date compared to 20-30 years ago.
Planning for May 20th in Longmont, CO? Great weather for outdoor activities. Consider bringing rain gear or an umbrella.
Cooling Trend
0.8°F per decade on this date
| Year | High | Low | Avg | Precip | Snow |
|---|---|---|---|---|---|
| 2025 | 66° | 39° | 53° | — | — |
| 2024 | 81° | 47° | 64° | — | — |
| 2023 | 59° | 49° | 54° | 0.05" | — |
| 2022 | 86° | 40° | 63° | 0.25" | — |
| 2021 | 73° | 46° | 60° | — | — |
| 2020 | 90° | 58° | 74° | — | — |
| 2019 | 51° | 36° | 43° | 0.84" | — |
| 2018 | 52° | 42° | 47° | 0.2" | — |
| 2017 | 63° | 30° | 46° | — | — |
| 2016 | 78° | 46° | 62° | — | — |
| 2015coldest | 43° | 35° | 39° | 0.81" | — |
| 2014 | 78° | 51° | 65° | — | — |
| 2013 | 65° | 46° | 55° | 0.15" | — |
| 2012 | 73° | 38° | 55° | — | — |
| 2011 | 61° | 34° | 47° | 1.32" | — |
| 2010 | 69° | 44° | 57° | — | — |
| 2008 | 81° | 47° | 64° | — | — |
| 2007 | 81° | 47° | 64° | — | — |
| 2006warmest | 87° | 62° | 75° | — | — |
| 2005 | 90° | 54° | 72° | — | — |
| 2004 | 82° | 54° | 68° | — | — |
| 2003 | 49° | 42° | 45° | — | — |
| 2002 | 71° | 41° | 56° | — | — |
| 2001 | 69° | 46° | 58° | — | — |
| 2000 | 71° | 40° | 55° | — | — |
| 1999 | 86° | 41° | 64° | — | — |
| 1998 | 87° | 48° | 68° | — | — |
| 1997 | 70° | 37° | 53° | — | — |
| 1996 | 81° | 41° | 61° | — | — |
| 1995 | 71° | 46° | 59° | 0.3" | — |
| 1994 | 87° | 47° | 67° | — | — |
| 1993 | 69° | 42° | 56° | 0.46" | — |
| 1992 | 89° | 51° | 70° | 0.05" | — |
| 1991 | 89° | 57° | 73° | — | — |
| 1990 | 70° | 41° | 55° | — | — |
| 1989 | 76° | 39° | 57° | — | — |
| 1988 | 50° | 40° | 45° | 2.54" | — |
| 1987 | 75° | 50° | 63° | 1.4" | — |
| 1986 | 82° | 46° | 64° | — | — |
| 1985 | 63° | 43° | 53° | — | — |
| 1984 | 76° | 44° | 60° | — | — |
| 1983 | 49° | 40° | 44° | 0.53" | — |
| 1982 | 79° | 43° | 61° | — | — |
| 1981 | 60° | 42° | 51° | — | — |
| 1980 | 71° | 42° | 57° | 0.05" | — |
| 1979 | 76° | 45° | 60° | 0.08" | — |
| 1978 | 73° | 48° | 61° | — | — |
| 1977 | 70° | 45° | 57° | — | — |
| 1976 | 83° | 47° | 65° | 0.13" | — |
| 1975 | 84° | 43° | 63° | — | — |
| 1974 | 88° | 51° | 69° | — | — |
| 1973 | 77° | 55° | 66° | 0.03" | — |
| 1972 | 87° | 46° | 67° | 0.61" | — |
| 1971 | 64° | 37° | 51° | — | — |
54 years of data from LONGMONT 2 ESE