Weather on May 12
Boulder, CO
55 Years of Data
Avg High
68°F
Avg Low
41°F
Warmest
2025
69°F avg
Coldest
2010
36°F avg
About This Date
May 12th in Boulder, CO typically brings mild spring weather, with average highs around 68°F and lows near 41°F — a 27°F daily swing. Over 55 years of records, the warmest May 12th was in 2025 (69°F average), while the coldest was 2010 (36°F) — a 33°F range across recorded history. Precipitation has occurred on 42% of recorded May 12th dates, with snow falling 4% of the time (heaviest snowfall: 5.1"). The last decade has been 4.9°F warmer on this date compared to 20-30 years ago.
The last decade has been 4.9°F warmer on this date compared to 20-30 years ago.
Planning for May 12th in Boulder, CO? Great weather for outdoor activities. Consider bringing rain gear or an umbrella.
| Year | High | Low | Avg | Precip | Snow |
|---|---|---|---|---|---|
| 2025warmest | 86° | 52° | 69° | — | — |
| 2024 | 64° | 48° | 56° | — | — |
| 2023 | 64° | 46° | 55° | — | — |
| 2022 | 68° | 52° | 60° | — | — |
| 2021 | 63° | 37° | 50° | — | — |
| 2020 | 66° | 41° | 54° | — | — |
| 2019 | 72° | 36° | 54° | — | — |
| 2018 | 57° | 50° | 54° | — | — |
| 2017 | 78° | 41° | 60° | — | — |
| 2016 | 72° | 34° | 53° | — | — |
| 2015 | 69° | 33° | 51° | — | — |
| 2014 | 42° | 31° | 36° | 0.89" | 5.1" |
| 2013 | 77° | 47° | 62° | — | — |
| 2012 | 47° | 37° | 42° | 0.3" | — |
| 2011 | 48° | 37° | 43° | 1.04" | — |
| 2010coldest | 40° | 32° | 36° | 2.87" | 4.7" |
| 2009 | 76° | 50° | 63° | — | — |
| 2008 | 79° | 53° | 66° | — | — |
| 2007 | 81° | 49° | 65° | — | — |
| 2006 | 80° | 39° | 60° | — | — |
| 2005 | 57° | 35° | 46° | 0.05" | — |
| 2004 | 68° | 34° | 51° | 1.45" | — |
| 2003 | 71° | 35° | 53° | — | — |
| 2002 | 56° | 37° | 46° | 1.55" | — |
| 2001 | 80° | 43° | 61° | — | — |
| 2000 | 55° | 31° | 43° | 0.08" | — |
| 1999 | 69° | 31° | 50° | — | — |
| 1998 | 68° | 37° | 53° | 0.03" | — |
| 1997 | 68° | 34° | 51° | 0.41" | — |
| 1996 | 77° | 47° | 62° | — | — |
| 1995 | 67° | 43° | 55° | 0.53" | — |
| 1994 | 77° | 52° | 64° | 0.23" | — |
| 1993 | 71° | 47° | 59° | — | — |
| 1992 | 76° | 43° | 59° | 0.03" | — |
| 1991 | 82° | 49° | 65° | — | — |
| 1990 | 59° | 34° | 46° | 0.76" | — |
| 1989 | 74° | 48° | 61° | 0.23" | — |
| 1988 | 83° | 46° | 64° | — | — |
| 1987 | 76° | 46° | 61° | — | — |
| 1986 | 79° | 43° | 61° | 0.05" | — |
| 1985 | 57° | 37° | 47° | 0.46" | — |
| 1984 | 88° | 48° | 68° | — | — |
| 1983 | 64° | 30° | 47° | 0.03" | — |
| 1982 | 45° | 38° | 41° | 2.69" | — |
| 1981 | 70° | 39° | 54° | 0.08" | — |
| 1980 | 60° | 36° | 48° | — | — |
| 1979 | 65° | 29° | 47° | — | — |
| 1978 | 64° | 39° | 52° | 0.36" | — |
| 1977 | 79° | 48° | 63° | — | — |
| 1976 | 63° | 39° | 51° | 0.51" | — |
| 1975 | 66° | 43° | 54° | — | — |
| 1974 | 83° | 37° | 60° | — | — |
| 1973 | 59° | 43° | 51° | — | — |
| 1972 | 61° | 36° | 48° | 0.13" | — |
| 1971 | 62° | 35° | 49° | — | — |
55 years of data from BOULDER MUNI AP