October 2019: A Month of Extreme Weather for the U.S.
In fact, it is likely that this October was the most extreme such on record, at least so far as temperatures are concerned. We saw unprecedented heat in portions of the eastern U.S. during the first week of the month, transitioning to unprecedented cold in portions of the west during the final week of the month.
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A total of 10 states plus the District of Columbia saw their all-time October monthly high temperature records broken or tied during the first four days of October.
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In summary, this early-October heat wave appears to the most intense and anomalous on record for such a large region of the U.S. during the month of October.
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All in all, it is likely (but difficult to verify) that no other past October has seen such extreme temperatures variations from coast to coast in the contiguous U.S.
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The coldest official October record for the contiguous U.S. was -33° at Soda Butte (in Yellowstone National Park), Wyoming, on Oct. 29, 1917, but a new 48-state record has been established (see below).
Many other all-time monthly cold records were set in Arizona, Utah, Colorado, South Dakota, Kansas, Montana, Nebraska, California, and Texas...
