A mid-month cold snap interrupted an otherwise warm September from the Plains to the Atlantic seaboard. On the 15th the season's first freeze accompanied the cold spell as far south as Iowa. Despite the brief chill, monthly temperatures generally averaged 2 to 6℉ above normal across much of the eastern one-third of the United States. Meanwhile, warm weather prevailed in the West during the first half of the month, followed by markedly cooler conditions thereafter. Monthly temperatures averaged at least 4℉ below normal at several locations in Southern California.
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