Guide
Climate, Seasons and Safety
What each Ontario season feels like, how to dress for it, the risks to know about, and how to prepare for storms and power outages.
In this guide
Ontario has four strong seasons and the difference between them is large. Winter can reach twenty degrees below zero and summer can feel like forty. Knowing what is coming makes the year far easier and much safer.
5 chapters. Read in any order.
December to March
Winter
Dressing in layers, frostbite and hypothermia, ice and snow, driving, and heating your home.
6 minute read
March to May
Spring
Melting snow and flooding, changeable weather, allergies, ticks and thunderstorms.
4 minute read
June to August
Summer
Heat waves, sun safety, water safety, air quality, insects and food safety.
5 minute read
September to November
Autumn
The mildest season, shorter days, school traffic, slippery leaves and flu shots.
4 minute read
All year
Emergency preparedness
A basic home kit, a family plan and the numbers to know before you need them.
5 minute read
New to Ontario weather?
Weather can change quickly. Check official alerts, not only the temperature, before travel or outdoor activity. A warning means conditions may affect safety and you should follow local instructions.
Before your first winter
- Get a warm coat, boots with grip, gloves, a hat and warm socks.
- Learn how your home heating works and how to report a problem.
- Prepare a small emergency kit and check local transit or road updates.
- Save official weather alerts and municipal emergency information on your phone.
Last reviewed: August 5, 2026
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