Tuesday's high of 68 in Sioux Falls was the second coldest high on July 1. 1997 had a similar cold day with a record cold high of 64 degrees on July 3. Some of you may remember the trend that we picked up on in the spring. May of 1997 set some record lows in mid-May, much like the record low Sioux Falls had on May 16.
Later in the fall of 1997, near record cold came back at the end of October when overnight lows fell to the low teens during the last week of the month. The cold came back in the middle of November, this time the thermometer fell below zero.
1997 became a strong El Nino during the late summer and early fall. Forecast models and forecasters are calling for a strengthening El Nino for this summer and this fall. El Nino is a warming of the Pacific Ocean, which has an effect of the jet stream around the globe.
Whether or not we follow the trend of cold air in the late fall remains to be seen, but it's something worth watching.