Coquitlam's winters are chilly, with temperatures often below freezing, but occasional warm spells can bring temperatures into double digits. As spring arrives in March and April, temperatures gradually rise, with April being particularly mild, allowing for pleasant outdoor activities. Summer months from June to August are warm, with temperatures frequently reaching the mid-20s to low 30s Celsius, making it a great time for outdoor recreation. Autumn brings a return to cooler temperatures, but still relatively mild compared to winter, with September and October experiencing moderate temperatures. Winter returns in December, bringing cold temperatures that can drop below -10C on occasion.