Due to Ontario’s size, temperatures may vary tremendously from region to region. The overall climate is considered ‘continental’ with humidity adding to the heat in the summer and ‘wind chill’ adding to the cold in the winter. On average, the coldest month of the year is January and the warmest is July with the shoulder seasons of spring and fall (autumn) being quite comfortable.
Northern Ontario has very long, very cold winters and short summers; however, the southern part of the province enjoys the moderating effect of the Great Lakes. In summer, temperatures can soar above 30C (86F), while in winter they can drop to below -13C (9F).
Spring brings melting snow, budding flowers, and delicious treats from March to May in the form of fresh maple syrup at the local sugar bush. Orchids grow like weeds on the Bruce Peninsula, orchards of apple trees are blossoming, and tulips decorate Ottawa, the nation’s capital. The cities come alive with food trucks popping up, Bixi bikes hitting the streets, and outdoor patios filling with happy patrons.
Summer (mid-June through September) in Southern Ontario can be hot and muggy, with temperatures from 18C (64F) to 28C (77F). With humidity it can feel much warmer than this. Summer is the time to enjoy fresh strawberries and tomatoes, ‘go to the cottage’, camp in the parks, hit the trails, and to enjoy the beautiful beaches along the Great Lakes.
Autumn (mid September to November) sweeps in with a burst of colour, aroma and flavour. Ontario is home to Red Maples, Sugar Maples, Japanese and Harlequin Maples – you name the Maple and you will find it here! They are lovely trees in any season, but in fall in Ontario they really show their colours. It is also harvest time, when you can enjoy pumpkins, apples, pears, and enjoy celebrations in Ontario’s wine regions. This is a great time for outdoor activity with crisp, dry air and brilliant blue skies.
Winter (November through March) brings an abundance of snow and plenty of opportunities for ice skating, skiing, snowshoeing, or even dog-sledding. Temperatures is southern Ontario can change dramatically (-20C (-4F) to -5C (23F) and without warning in a 24-hour period, so if you’re going outside be sure to wrap up warmly: snow pants, down/fibre-filled jackets, boots, hats, mittens and so on.
We recommend visiting Environment Canada’s website for information specific to the region in which you are travelling.