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Public Information Statement
National Weather Service Denver/Boulder CO
259 AM MDT MON SEP 21 2026

...Today in metro Denver weather history...

20-21 In 1963...heavy rain and hail caused local flooding in
        southeast Denver.  Thunderstorm rainfall was only
        0.60 inch at Stapleton Airport on the 20th.
      In 1983...the cold front on the 19th brought an unusually cold
        air mass into metro Denver for so early in the season.  The
        temperature dipped to a daily record minimum of 28 degrees
        on both days.
      In 1995...a vigorous late summer storm brought the season`s
        first heavy snow to portions of metro Denver.  Millions
        of trees were damaged and power lines downed as 4 to 8
        inches of heavy wet snow settled on fully leafed trees in
        the Boulder and Denver areas.  Branches snapped and trees
        split under the weight of heavy snow...downing power lines.
        Firefighters responded to numerous transformer fires.
        Around 100 thousand people were left without electricity
        in Boulder and Denver areas alone.  It took over a week
        to fully restore power to some areas.  Insurance claims
        were estimated to be around 6 million dollars to homes
        in metro Denver and about 500 thousand dollars in damage
        to automobiles.  It was estimated that about 80 percent
        of 125 million dollars worth of city owned trees in Denver
        were damaged.  Snowfall totaled 7.4 inches at the site of
        the former Stapleton International Airport where the
        greatest depth of snow on the ground was only 4 inches
        due to melting.  Temperature records were set on the
        21st when the thermometer dipped to a record low reading
        of 27 degrees and climbed to a high of only 36 degrees...
        setting a record low maximum for the date.  North winds
        gusted to 29 mph at Denver International Airport on the
        20th.
20-22 In 1902...a thunderstorm on the 20th...in advance of an
        apparent cold front...produced rain...hail...and northwest
        winds to 40 mph with gusts to 48 mph.  Widespread rain
        developed behind the cold front and totaled 3.21 inches
        from the evening of the 20th through the early afternoon
        of the 22nd.  The 2.70 inches of precipitation recorded
        from 800 PM on the 20th to 800 PM on the 21st is the
        greatest 24 hour precipitation ever recorded in the
        month of September.  The temperature dipped from a high
        of 80 degrees on the 20th to a high of only 51 degrees
        on the 21st.
21    In 1951...4.2 inches of snow fell at Stapleton Airport...
        where northeast winds gusted to 27 mph.  This was the
        first snowfall of the season in Denver...marking the end
        of the second shortest snow-free period on record...109
        days...from June 4th through September 20th.  A trace of
        snow fell on June 3rd.
      In 1984...thunderstorm winds gusted to 56 mph at Stapleton
        Airport.
      In 1992...the only precipitation of the month at Stapleton
        International Airport...0.01 inch of rain...fell from a
        brief shower around daybreak.
      In 2009...an early season storm brought moderate to heavy
        snow to the foothills of Clear Creek...Jefferson and Park
        Counties...west and southwest of Denver.  A trained
        spotter...4 miles west-northwest of Conifer...was the big
        winner with 14 inches of snow.  Storm totals elsewhere
        generally ranged from 5 to 10 inches.
21-22 In 1870...strong winds occurred in the foothills and in
        Boulder and Denver.
      In 1895...rain changed to snow overnight and totaled 11.4
        inches in downtown Denver.  This was the first snowfall
        of the season and the second heaviest first snowfall of
        the season on record.  North winds were sustained to 27
        mph with gusts to 30 mph on the 21st.

$$