![](http://data.mesonet.org/data/public/climate/ok/archive/normals/images/1991-2020/earliest_lastfreeze.1991-2020.png)
About This Product
From the Supplemental Climate Normals supplied by the National Centers for Environmental Information (NCEI), based on historical data from 1991 to 2020. Each date represents a 10% chance the final spring freeze will occur on or before the date displayed, and a 90% chance it will occur after the date displayed.