Weather on May 12
Boulder, CO
55 Years of Data
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 56 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 41% of recorded May 12th dates, with snow falling 4% of the time (heaviest snowfall: 5.1"). The last decade has been 5.9°F warmer on this date compared to 20-30 years ago.
The last decade has been 5.9°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 |
|---|---|---|---|---|---|
| 2026 | 77° | 57° | 67° | — | — |
| 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° | 0.35" | 5.1" |
| 2013 | 77° | 47° | 62° | — | — |
| 2012 | 47° | 37° | 42° | 0.12" | — |
| 2011 | 48° | 37° | 43° | 0.41" | — |
| 2010coldest | 40° | 32° | 36° | 1.13" | 4.7" |
| 2009 | 76° | 50° | 63° | — | — |
| 2008 | 79° | 53° | 66° | — | — |
| 2007 | 81° | 49° | 65° | — | — |
| 2006 | 80° | 39° | 60° | — | — |
| 2005 | 57° | 35° | 46° | 0.02" | — |
| 2004 | 68° | 34° | 51° | 0.57" | — |
| 2003 | 71° | 35° | 53° | — | — |
| 2002 | 56° | 37° | 46° | 0.61" | — |
| 2001 | 80° | 43° | 61° | — | — |
| 2000 | 55° | 31° | 43° | 0.03" | — |
| 1999 | 69° | 31° | 50° | — | — |
| 1998 | 68° | 37° | 53° | 0.01" | — |
| 1997 | 68° | 34° | 51° | 0.16" | — |
| 1996 | 77° | 47° | 62° | — | — |
| 1995 | 67° | 43° | 55° | 0.21" | — |
| 1994 | 77° | 52° | 64° | 0.09" | — |
| 1993 | 71° | 47° | 59° | — | — |
| 1992 | 76° | 43° | 59° | 0.01" | — |
| 1991 | 82° | 49° | 65° | — | — |
| 1990 | 59° | 34° | 46° | 0.3" | — |
| 1989 | 74° | 48° | 61° | 0.09" | — |
| 1988 | 83° | 46° | 64° | — | — |
| 1987 | 76° | 46° | 61° | — | — |
| 1986 | 79° | 43° | 61° | 0.02" | — |
| 1985 | 57° | 37° | 47° | 0.18" | — |
| 1984 | 88° | 48° | 68° | — | — |
| 1983 | 64° | 30° | 47° | 0.01" | — |
| 1982 | 45° | 38° | 41° | 1.06" | — |
| 1981 | 70° | 39° | 54° | 0.03" | — |
| 1980 | 60° | 36° | 48° | — | — |
| 1979 | 65° | 29° | 47° | — | — |
| 1978 | 64° | 39° | 52° | 0.14" | — |
| 1977 | 79° | 48° | 63° | — | — |
| 1976 | 63° | 39° | 51° | 0.2" | — |
| 1975 | 66° | 43° | 54° | — | — |
| 1974 | 83° | 37° | 60° | — | — |
| 1973 | 59° | 43° | 51° | — | — |
| 1972 | 61° | 36° | 48° | 0.05" | — |
| 1971 | 62° | 35° | 49° | — | — |
Boulder, CO Temperature Range by Month
Average monthly highs and lows. The shaded band shows the typical daily temperature range.
Boulder, CO Monthly Precipitation
Average rainfall and snowfall per month, in inches.
Boulder, 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 Boulder, CO
Most pleasant months in Boulder, CO: May, June, September, October.
What to expect on May 12th
This page shows what actually happened each year. For the odds — typical high and low, and how often it stays dry — see the climatological outlook for this date.
May 12th outlook →