Weather on April 20
Boulder, CO
55 Years of Data
Avg High
61°F
Avg Low
35°F
Warmest
1989
66°F avg
Coldest
2021
25°F avg
About This Date
April 20th in Boulder, CO typically brings mild spring weather, with average highs around 61°F and lows near 35°F — a 26°F daily swing. Over 55 years of records, the warmest April 20th was in 1989 (66°F average), while the coldest was 2021 (25°F) — a 41°F range across recorded history. Precipitation has occurred on 35% of recorded April 20th dates, with snow falling 9% of the time (heaviest snowfall: 10.5"). The last decade has been 3.6°F cooler on this date compared to 20-30 years ago.
The last decade has been 3.6°F cooler on this date compared to 20-30 years ago.
Planning for April 20th in Boulder, CO? Great weather for outdoor activities. Consider bringing rain gear or an umbrella.
| Year | High | Low | Avg | Precip | Snow |
|---|---|---|---|---|---|
| 2025 | 64° | 32° | 48° | — | — |
| 2024 | 36° | 30° | 33° | — | — |
| 2023 | 50° | 32° | 41° | — | — |
| 2022 | 72° | 50° | 61° | — | — |
| 2021coldest | 34° | 16° | 25° | — | — |
| 2020 | 64° | 36° | 50° | — | — |
| 2019 | 79° | 45° | 62° | — | — |
| 2018 | 50° | 32° | 41° | — | — |
| 2017 | 62° | 35° | 49° | 0.08" | — |
| 2016 | 58° | 33° | 45° | — | — |
| 2015 | 56° | 32° | 44° | — | — |
| 2014 | 71° | 40° | 55° | 0.23" | — |
| 2013 | 56° | 32° | 44° | — | — |
| 2012 | 70° | 36° | 53° | — | — |
| 2011 | 54° | 31° | 42° | 0.03" | — |
| 2010 | 70° | 37° | 53° | — | — |
| 2009 | 73° | 40° | 56° | — | — |
| 2008 | 75° | 48° | 62° | — | — |
| 2007 | 69° | 31° | 50° | — | — |
| 2006 | 66° | 30° | 48° | — | — |
| 2005 | 64° | 40° | 52° | 0.25" | — |
| 2004 | 65° | 41° | 53° | — | — |
| 2003 | 57° | 31° | 44° | 0.05" | — |
| 2002 | 41° | 31° | 36° | 0.36" | 0.1" |
| 2001 | 70° | 44° | 57° | 0.28" | — |
| 2000 | 67° | 33° | 50° | — | — |
| 1999 | 72° | 46° | 59° | — | — |
| 1998 | 51° | 32° | 42° | 0.58" | 0.2" |
| 1997 | 69° | 44° | 57° | — | — |
| 1996 | 53° | 29° | 41° | 0.03" | — |
| 1995 | 48° | 31° | 39° | 0.03" | — |
| 1994 | 75° | 41° | 58° | 0.03" | — |
| 1993 | 48° | 29° | 38° | — | — |
| 1992 | 61° | 30° | 45° | — | — |
| 1991 | 53° | 34° | 43° | — | — |
| 1990 | 66° | 40° | 53° | 0.08" | — |
| 1989warmest | 83° | 50° | 66° | — | — |
| 1988 | 72° | 41° | 56° | — | — |
| 1987 | 58° | 32° | 45° | 2.11" | 5.3" |
| 1986 | 66° | 37° | 52° | — | — |
| 1985 | 60° | 33° | 47° | — | — |
| 1984 | 52° | 31° | 41° | 3.91" | 10.5" |
| 1983 | 71° | 38° | 54° | — | — |
| 1982 | 37° | 25° | 31° | 0.38" | — |
| 1981 | 59° | 44° | 52° | 0.79" | — |
| 1980 | 81° | 46° | 63° | — | — |
| 1979 | 65° | 37° | 51° | — | — |
| 1978 | 61° | 30° | 45° | — | — |
| 1977 | 47° | 32° | 39° | 1.7" | — |
| 1976 | 60° | 37° | 49° | — | — |
| 1975 | 61° | 34° | 47° | — | — |
| 1974 | 63° | 32° | 47° | — | — |
| 1973 | 50° | 32° | 41° | — | — |
| 1972 | 47° | 33° | 40° | 0.58" | — |
| 1971 | 52° | 33° | 42° | 1.32" | 1.6" |
55 years of data from BOULDER MUNI AP