The high temperatures yesterday weren't record breaking, but very close.
Windsor was the warmest part of the region, where the mercury hit 22.7 C (72.8 F). That ties a record at Windsor airport set in 1987.
In Chatham-Kent it was close to breaking a record, but didn't quite hit it.
Environment Canada Meteorologist Peter Kimbell says a high pressure system along the eastern seaboard gets the credit.
"That's basically generating a southerly flow of air over the midwest including Michigan and Ohio and into Ontario as well, so we're getting the air that should be a lot further south," he says.
Kimbell says the temperatures will become more seasonal over the weekend.