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The brutal nature of the cold temperatures in towns like Casper, Wyoming, are one for the books, the forecast low in Casper on Monday morning is expected to hover around -1 ° F. Of the nearly 2,500 October days on record in Casper -- records date back to 1939 -- only four mornings have ever been this cold. Incredibly, all four sub-zero October temperatures took place in the final days of October 2019.