Many all-time record low temperature records for the month of July were broken. On Wednesday morning Joplin, Missouri tied its all-time July record low of 50 degrees.

The state of Oklahoma recorded its coolest July day on Thursday with an average temperature of 63.6 degrees. The previous record was 66.3 degrees set on July 12, 1953. The average temperature is found by adding up all the high and low temperatures across the state, then dividing the total by two and then dividing by the number of reporting stations.

On Friday, all-time record coolest high temperatures for the month of July were set across much of the South. A few of the cities that set records are Memphis, Tennessee; Greenwood, Mississippi; and Longview, Texas.

New all-time July coolest high temperature records set on July 18, 2014.

http://www.weather.com/news/weather-forecast/polar-invasion-july-record-cold-temperatures-20140716