Last and First Frost for Salt Lake Valley Research Back 40 years
This weekend I had some time on my hands. So not only did I track all winter temps that dropped below 10*, going back to 1970, per SL International Weather Data, and found out I am actually a zone 7a per the last 2 decades of temps. I also put a graph together of the first and last frost in Salt Lake Valley going back 40+ years and thought it might be helpful to some of you.
The different color bars indicate decades
The bold black line across each decade indicates the average for that decade
The red line is the running average for the 40 years
The grey shading indicates the 7 days before and after the average frost
Thought you may find it useful, I sure am.