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Public Information Statement
National Weather Service Denver/Boulder CO
259 AM MDT TUE JUL 21 2026

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

7-25  In 1934...a streak of 15 consecutive days of 90 degrees...from the
        7th to the 25th...ranked 5th on the list of hot streaks.  The
        record of 24 consecutive days was established in the summer of
        2008.
13-5  In 2008...a streak of 24 consecutive days of 90 degrees...from
        July 13th to August 5th...shattered the previous record of 18
        consecutive days established in 1901 and 1874. Ironically...
        no new single day record high temperatures were set in the
        month of July. In August however...a record of 104 degrees
        was set on the 1st...and another record of 103 degrees was
        set on the 2nd. In addition...a record low min of 70 degrees
        was set on August 2nd.
18-2  In 1987...from July 18th to August 2nd...a streak of 16
        consecutive days of 90 degrees ranked 4th on the list of hot
        streaks.  The record of 24 consecutive days was established
        in the summer of 2008.
19-23 In 2005...the high temperature climbed above 100 degrees on
        each of the 5 days with readings of 101 on the 19th...105 on
        the 20th...104 on the 21st...and 102 on both the 22nd and 23rd.
        A new record maximum temperature for the month of July of 105
        degrees was set on the 20th...which also equaled the all time
        record maximum for Denver of 105 degrees first set on August
        8th in 1878.  Daily maximum temperature records were set on
        each day...and the 5 day period equaled the record for the
        most consecutive days of 100 degrees or more first set from
        July 4th through 8th in 1989.  The intense heat resulted in
        a high use of electricity for cooling purposes.  The demand
        for electric power exceeded the supply and rolling black-outs...
        each lasting about an hour...were scheduled across metro Denver
        during the afternoons and early evenings.
20-23 In 1961...from the 20th to the 23rd...unusually cool weather for
        July resulted in several temperature records.  Record
        minimum temperatures were set or equaled on each day with
        readings of 51...51...49 and 49 degrees.  High temperature of
        only 64 degrees on the 21st was a record low maximum for the
        date.
20-25 In 1965...from the 20th to the 25th...heavy showers and
        thunderstorms doused metro Denver with significant rain each
        day.  Rainfall for the six days totaled 5.16 inches at
        Stapleton International Airport. Massive rainfall occurred
        on the 20th...21st...and 25th...flooding streets and basements
        and causing streams to overflow.  The heaviest rainfall...
        2.05 inches...at Stapleton International Airport occurred on
        the 25th.
21    In 1879...lightning struck a house in north Denver.  The bolt
        struck the center of the roof driving part of it into the
        house and scattered shingles all over the yard.  Furniture
        in the house was heavily damaged...but none of the the nine
        residents were injured other than being stunned.  The noise
        sounded as if a cannon had been exploded.  Rainfall was only
        0.02 inch downtown.
      In 1921...northwest winds were sustained to 42 mph with gusts
        to 48 mph.
      In 1943...a severe thunderstorm during the evening caused the
        death of a man whose truck skidded on a muddy roadway on
        a steep hill and overturned pinning him underneath.  Several
        small fires were started by the lightning...and electrical
        wires were downed.  No serious property damage was reported...
        but firemen answered 19 alarms in 2 hours.  One person was
        injured by lightning.
      In 1965...a funnel cloud was sighted in the northern portion of
        Denver.  Later...4 or 5 funnel clouds were sighted about 15
        miles north of Stapleton International Airport.  Heavy rain
        accompanied by hail washed away part of a city street and
        caused other flooding in Central City.  There were heavy
        showers and some damage from lightning in both Denver and
        Boulder.  Marble to golf ball size hail fell 10 miles
        northwest of Stapleton Airport.
      In 1966...heavy thunderstorm rains flooded streets and
        basements across metro Denver.
      In 1973...a tornado touched down briefly 2 miles northeast
        of Parker...causing minor damage.  Funnel clouds were also
        sighted 3 miles northeast of Sedalia...11 miles south
        southeast of Stapleton International Airport...and near
        Parker.  Hail to 3/4 inch in diameter fell over the western
        suburbs of Denver.
      In 1974...heavy thunderstorm rains caused flash flooding in
        metro Denver.  Rainfall totaled 1.26 inches at Stapleton
        International Airport.
      In 1976...heavy thunderstorm rains occurred across south metro
        Denver with 1.75 inches of rain recorded in 40 minutes
        in southeast Aurora and 2.00 inches in 20 minutes at Cherry
        Creek Reservoir.  A funnel cloud was sighted by the public
        east of Arapahoe County Airport...now Centennial Airport.
      In 1981...the temperature reached 100 degrees...setting a new
        record high for the date.
      In 1983...downpours drenched the Front Range where amounts of
        1 to 2 inches were common.  The heaviest reported rainfall
        was 2.36 inches in a 6-hour period at Parker where hail to
        3/4 inch and wind gusts as high as 75 mph occurred.  Up to
        golf ball size hail fell in the Parker and Castle Rock areas;
        wind gusts to 75 mph were recorded in Castle Rock.
      In 1993...thunderstorm winds toppled a 3 story high Russian
        olive tree in Boulder.  The tree barely hit and only
        slightly damaged a parked car.
      In 1995...thunderstorm winds from the west gusted to 55 mph
        at Denver International Airport.
      In 2002...heavy thunderstorm rainfall caused flash flooding
        in the Hayman Fire burn area.  South Deckers Road...State
        Highway 126...was closed when 4 feet of water inundated
        a section of the roadway.  The U.S. Forest Service had
        to remove 40 truck loads of sediment to reopen the road.
        Also...heavy debris flow washed out a secondary service
        road in southwest Douglas County.  Hail as large as 3/4
        inch in diameter fell near Bennett.
      In 2011...lightning struck a home in Arapahoe County and
        caused substantial fire damage. Five people were in the
        home but no one was injured. There was structural damage
        to both the interior and exterior of the residence.

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