Record highs and lows on the same day

Dear Tom,
You recently corrected erroneous data that showed the record high and low
for June 5 occurring in the same year. Has that ever happened here?
John Dawson, Oak Park
Dear John,
For a city to establish a record high and record low on the same date is an
extremely rare event, one that has never occurred in Chicago. In most cases
extraordinary meteorological circumstances are required to accomplish this
feat. A dry atmosphere is almost always a prerequisite along with unlimited
sunshine, and clear skies and light winds at night. Such conditions were
present in August 2002 when a rash of same-day record highs and lows were
set in the western United States. Unbelievably, Park City, Utah, broke or
tied its record high/low three times in one week (Aug. 11, 13 and 15) and
Alamosa, Colo., did it on consecutive days (Aug. 25 and 26). A single
occurrence was also recorded on Aug. 25 at Safford, Ariz., northeast of
Tucson.