London Ontario Snow Day Predictor — Thames Valley DSB School Closure Forecast
London Ontario Snow Day Predictor
Canada's most accurate snow day predictor
Will London Ontario Schools Be Closed Tomorrow?
London, Ontario — “the Forest City” — sits in Southwestern Ontario’s agricultural heartland, an area influenced by both Lake Huron lake-effect snow to the northwest and Lake Erie moisture from the south. London receives approximately 200–220 cm of snow per year, making it one of the snowier major Ontario cities, and the Thames Valley District School Board (TVDSB) serves a broad geographic area including the city and extensive rural territory where bus route safety is a primary concern.
School Boards We Cover
- Thames Valley District School Board (TVDSB) — Covers London, St. Thomas, Tillsonburg, Woodstock, Strathroy, and a large rural area. tvdsb.ca | Announces: by 6:00 AM | Radio: AM 1290 CJBK, AM 1410 CFTE | Twitter/X: @TVDSBschools
- London District Catholic School Board (LDCSB) — Catholic board for London area. ldcsb.ca
- Conseil scolaire Viamonde — French public board covering London area.
- Conseil scolaire catholique Providence — French Catholic board covering London area.
Lake Huron Snow Belt — London’s Winter Challenge
London is positioned in the Lake Huron–Lake Erie snow belt. Under northwest winds — the most common winter wind direction in Ontario — cold air crossing Lake Huron delivers moisture to the north shore and deposits it as heavy snow across the region between Goderich and London. Lake Erie lake-effect, while less common for London specifically, adds additional moisture under south and southwest winds. These mechanisms make London’s snowfall totals higher than its latitude would suggest from climatological averages alone.
London’s Snow Day History
London typically experiences 4–7 TVDSB closure days per year. The board’s large rural coverage area means decisions are often driven by county road and secondary highway conditions rather than London city streets, which are maintained well. Southwestern Ontario snowstorms from Lake Huron can be particularly intense in February and early March when the lake remains ice-free longest.
When Does TVDSB Announce?
Announces by 6:00 AM via tvdsb.ca, AM 1290 CJBK, AM 1410 CFTE, and SchoolMessenger notifications.
Nearby Communities
- Hamilton Snow Day Predictor — HWDSB (east)
- Windsor Snow Day Predictor — GECDSB (southwest)
- Kitchener Snow Day Predictor — WRDSB (northeast)
Frequently Asked Questions — London Ontario Snow Days
Why does London get so much snow?
London sits in the path of Lake Huron lake-effect snow under northwest winds — the predominant winter wind direction. Cold Arctic air crossing the relatively warm lake picks up moisture and deposits it as heavy snow across the region. London also receives Lake Erie-influenced moisture under south winds. Combined, these mechanisms produce snowfall totals significantly above what London’s latitude would suggest.