Ontario is the second largest province in Canada. As a result, temperatures will vary greatly from region to region. Summer temperatures range from 25 to 30 degrees Celsius (77 to 88 degrees Fahrenheit). January, February and March are considered winter months with snow present in most areas. Winter temperatures range from minus 5 to minus 15 degrees Celsius (23 to 5 degrees Fahrenheit). Many pleasant, cooler days are experienced in the spring and fall. For an exact conversion of Celsius to Fahrenheit, multiply the Celsius temperature by 9/5 and add 32.
Temperatures are given officially in degrees Celsius (C) with the Fahrenheit equivalent (F) often added.
For an exact conversion of Celsius to Fahrenheit, multiply the Celsius temperature by 9, divide that answer by 5, and add 32.
Environment Canada provides a current Ontario weather update and local forecasts. On average, the coldest month of the year is January and the warmest is July.
The cold polar air from the north meeting the warm, moist air from the south causes considerable precipitation throughout the year. During the winter months, most of Ontario is blanketed with snow, especially in the north. The Canada Weather Office provides frequently updated reports for all regions in Ontario.
Snow Conditions and Ski Reports
Snow reports and ski/snowboard conditions for major ski resorts in Ontario are available through Ski Ontario, from December-March.
Snowmobile Trail Conditions
Fall Colour Report
The transition between summer and winter is spectacular in the NOSTA region and in Ontario. Landscapes and cityscapes are ablaze with shades of yellow, orange and bright red. Warm days and cool evenings make for ideal fall-colour touring within our region and around the world famous Lake Superior Circle tour.