Severe Weather
Severe weather conditions may require the TDSB to cancel transportation or, in extreme conditions, close schools. The decision to close schools is made by the Director of Education. In the event transportation is cancelled or schools are closed, the local media will be informed before the beginning of the school day. Tune in to your radio and television news stations for the latest information.

If weather conditions become extreme after students are in school, elementary students will remain in the school until they are picked up by a parent or parent designate.

Recess and Lunch Time
Students are kept indoors for recess and lunch time for a number of weather conditions such as rain, lightning in the area, extreme winds and extreme cold. When temperature and wind chill measure -28C or lower, students are kept indoors. Recess and lunch may be shortened if the temperature and wind chill reading is between -28C and -20C.

If a student's medical condition requires further consideration due to weather conditions, or if you have other questions or concerns about how and when weather conditions affect your child's school day, please speak with someone from the main office.

http://www.weatheroffice.gc.ca/city/pages/on-143_metric_e.html