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Want some proof? How about this?
Led by a historic and long-lived heat wave in the middle of the month, March, 2012, saw more than 15,700 daily record high, and high minimum, temperatures set or tied in the U.S. There were fewer than 900 low records set or tied during the same month.
http://www.climatecentral.org/blogs/march-heat-wave-shatters-monthly-records/
Sorry; that doesn’t impress me much. Anything else?