It’s Winter, it’s supposed to be cold. I would be worried if we had a heat wave of 100° plus.
Here is a web page for the highs and lows in Historical Averages for Tulsa, OK. As you can see, we have had a constant change in temps from one year to the next. Hot, cold, hot, cold.
http://www.intellicast.com/Local/History.aspx?location=USOK0537
On this day, in 1907 it was 75 degrees. In 1916 it was -12, yet today, the reason for such changes would be blamed on glo-bull warming!
Yesterday, in 2006 it was 74 degrees. In 1918, it was -13.