in recent years, in southern ontario, meteorological fall starts on oct 1st - maybe. summer generally starts may 1st.
what tends to happen is that the weather just utterly crashes in the first or second week of october and then that's it, summer's over. it's not a slow ramp down; it comes in the form of a thunderstorm, and a wind barrage and five to ten days of highs in the mid to low teens. it's a sudden ten degree crash. it might recover a little for a week or two, but those 20+ degree days in late october don't feel like summer, they feel like warm fall days.
this year, it's been summer all the way through september, with highs in the late 20s and even early 30s. it still feels like july, here. we're still getting convection sunshowers, which in this part of the world are unheard of outside of late july and early august.
we had a cold snap in late may and early june, which sucked, so the last sub 20 degree day here was later than normal, june 4th. it's been 20+ degrees here every single day since june 5th. that's the psychological boundary between summer and not summer, in canada.
we should be ready for this to crash in mid october, but the long term is not projecting it, and i'm not feeling it. we should expect 7-10 days of 20+ degree weather in november in southern ontario nowadays, but it has always followed a cold snap in october or early november. if we get all the way to nov 1st, or even nov 15th, without a single fall day, that's going to be a serious indicator of very real climate change here, and it will make it hard for winter to take hold.
it would be nice to actually grow more fruit here. the entire greenhouse economy here switched to marijuana production after 2015; you can smell the giant grow-op just walking around leamington. it's kind of not very sustainable, and kind of looks pretty stupid, in hindsight. we used to grow tomatoes and strawberries and peaches. now we just grow drugs.