The Community Collaborative Rain, Hail and Snow Network (CoCoRaHS) - Canada sites
According to CoCoRaHS, this program is: "a unique, non-profit, community-based network of volunteers of all ages and backgrounds working together to measure and map precipitation across Canada. By using low-cost measurement tools, stressing training and education, and utilizing an interactive website, our aim is to provide the highest quality data for natural resource, education and research applications."
The Snow Tweets project offers realtime updates of snow depth data from community observers around the world using social media for data collection. The following Snowbird data mapping application visualizes snow depth spatial variation, layering community tweets with satellite snow data. See the Canadian Snow Research page for more details.