First Day Of Snow In Boulder - Physical Sciences Laboratory

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First Day of Snow in Boulder

Statistics from 1948-present

First day of measurable snow (greater than a trace) at the official Boulder weather station (currently NIST)

The latest known day is Nov 26 1910 (0.5). Older data can be problematic as not all days are available or are listed in the official record correctly. Measurement was often made just at 5pm so snow could have melted before a measurement was recorded. Data from 1948 onwards is more robust.

earliest day of 1st snow: Sep 12 (1974) latest day: Nov 17 (2016) average: Oct 17 low decile Sep 20 first quartile Sep 30 median Oct 20 third quartile Oct 30 high decile Nov 9 standard deviation 18.6 days

List first day of snow in Boulder 1948-present

1948 October 16 1949 October 19 1950 November 2 1951 September 21 1952 October 14 1953 November 4 1954 October 25 1955 October 23 1956 October 24 1957 October 25 1958 September 30 1959 September 29 1960 October 15 1961 October 29 1962 November 15 1963 October 31 1964 November 14 1965 September 20 1966 October 14 1967 October 29 1968 October 9 1969 October 3 1970 September 25 1971 September 17 1972 October 30 1973 November 2 1974 September 12 1975 October 23 1976 October 26 1977 November 8 1978 October 23* 1979 October 29 1980 October 27 1981 October 25 1982 October 19 1983 November 8 1984 September 25 1985 September 28 1986 October 11 1987 November 15 1988 November 15 1989 missing 1990 October 8 1991 October 4 1992 November 2 1993 September 13 1994 September 21 1995 September 21 1996 September 26 1997 October 24 1998 November 7 1999 September 28 2000 September 23 2001 October 5 2002 October 23 2003 October 30 2004 November 1 2005 November 15 2006 October 10 (1am) 2007 October 21 2008 October 13 2009 October 10 2010 November 9 2011 October 26 2012 October 5 2013 October 4 2014 September 12 2015 November 11 2016 November 17 2017 October 5 2018 October 10 2019 October 10 2020 September 8 2021 November 17 2022 October 27 2023 October 28 2024 November 4 *1978: The data at PSL has it as Nov 26. However, it did snow several times before that date and some of the "0s" are not. Oct 23rd was the first date.