Friday morning temperatures fell into the 40s in Western Pennsylvania.
Meteorologists say these cold temperatures are leading to trees changing colors in the middle of August.
"This is extraordinary for August, and certainly is a reflection of the prevalence of cool weather," KDKA Meteorologist Dennis Bowman said.
Right now Pittsburgh is on pace for the 9th coldest summer since record keeping began in 1871.
© Marlene Evans
Marlene Evans says she is noticing the trees already changing along Water Street. They show yellow and red leaves already mixing in with the trees' green leaves.
Bowman says it is odd to see the golden yellow and red leaves already showing up.
The Polar Vortex pattern that we saw in January, also caused cold temperatures in July.
"There has been a frequency of cold fronts this summer, and the weather for June, July, and August has been substantially below normal," Bowman said.
My two trucker friends, who drive across country constantly, tell me that this is not isolated to PA. I can attest that the south is also experiencing this, and has been since mid july. At first I thought it was a tree blight, but there is no evidence of damage, just very early autumn. We're a little below average here, but it doesn't seem like enough to trigger fall colors this early. Still in the 80-90s during the day and haven't gone below the mid 50s at night. My hot weather crops are doing fine, but maybe I better get the greenhouse patched up for cooler weather.