Record Temperatures in

October, 2021

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records were set or tied for the warmest nighttime low temperature at a weather station.
records were set or tied for the coldest nightime low temperature at a weather station.
records were set or tied for the warmest daytime high temperature at a weather station.
records were set or tied for the coldest daytime high temperature at a weather station.
*Each day, weather stations record the day's high and low temperature. In the graphic above, "nighttime low" refers to the low temperature and "daytime high" referes to the high temperature (even though lows can sometimes occur during the day and highs during the night). Thus, if a weather station records a daily low temperature that is warmer than any previous low temperature for that day in the station's history, then it is recorded as a "warmest nightime low" temperature. Likewise, if the daily high temperature is colder than any daily high in the station's history for that day of the year, then is counted as a "coldest daytime high" temperature.