October: Here’s what to expect from this notoriously WILD weather month ahead Dr. Doug Gillham mercredi, 2 octobre 2019 à 11:30 - A look at what we expect from this volatile weather month ahead. October is here -- a month that is notorious for wild swings in temperature. It is also a month that has a rapid drop-off in "normal" temperatures. Most of Canada will lose 5 to 10°C off of their normal temperatures between now and Halloween. The temperature plunge occurs faster across central Canada and slower near the coasts. For example, Winnipeg will see their average high temperatures drop from 15°C on October 1 to 5°C by October 31. In contrast, Vancouver sees their average high temperature drop from 16°C to 11°C.