Check your Montreal snow day probability before the school announcement. Instant school closure prediction based on snowfall, freezing rain, wind chill, and local conditions.
Montreal QC • Greater Montreal Area • Southern Quebec
Montreal winters are defined by heavy snowfall, frequent freeze-thaw cycles, and dangerous ice storm events that can paralyze the city overnight. Situated on the island of Montreal where the St. Lawrence and Ottawa Rivers converge, the city experiences a humid continental climate with long, cold winters and an average of 210 centimetres of snow per season. Our Snow Day Calculator pulls real-time Environment Canada weather data for Montreal and the Greater Montreal Area, weighing snowfall accumulation, freezing rain, wind chill, and road safety to generate a school closure probability for your postal code.
Montreal's school system operates through French-language and English-language school service centres, each making independent closure decisions. The Centre de services scolaire de Montreal (CSSDM) and the English Montreal School Board (EMSB) serve the largest student populations and each communicate closures through their own channels.
Montreal averages approximately 210 centimetres of snow per season, with individual storms regularly dropping 20-30 cm overnight. The city's position in the St. Lawrence Valley means it sits in the path of major winter storm systems tracking northeast along the Eastern Seaboard. These storms can rapidly intensify as they approach Montreal, making forecasting challenging and sometimes turning a moderate snow event into a major accumulation storm. Montreal's extensive snow removal infrastructure - one of the largest in the world - struggles to keep residential streets and school routes clear during peak storm periods.
Montreal sits at the junction of the St. Lawrence and Ottawa Rivers, directly in the path of major winter storm systems tracking northeast. Storms intensify as they move up the valley, often dropping significant snowfall on the city and surrounding communities.
Montreal's position in southern Quebec means temperatures frequently oscillate around the freezing point during winter. These freeze-thaw cycles produce some of the most dangerous conditions for school transportation - overnight rain that freezes by morning, creating invisible black ice across the entire road network.
Montreal is one of the most ice storm-prone cities in North America. The devastating 1998 Ice Storm left the city paralyzed for weeks. While such extreme events are rare, freezing rain events of several millimetres occur multiple times each winter, creating hazardous conditions for school buses and student walkers.
Arctic air masses push through Montreal multiple times each winter, driving wind chills to -30C or colder. Students waiting at bus stops or walking to school face real frostbite risk during these events, and school service centres factor wind chill heavily into morning closure decisions.
Freezing rain is the most feared winter weather event for Montreal school administrators. Unlike snowfall, which is manageable with plowing and sanding, freezing rain coats every surface with a layer of ice that makes roads, sidewalks, and school steps uniformly dangerous. School bus tires lose traction, students slip walking from home, and even well-maintained main roads become treacherous. As little as 2-3 mm of freezing rain accumulation can trigger widespread school bus cancellations and full school closures across the Montreal area.
Montreal winters bring extended cold periods with average January temperatures around -10C and overnight lows frequently reaching -20C or below. When Arctic fronts arrive, wind chills can plunge to -35C or colder. Montreal school service centres monitor these conditions closely, as students waiting at outdoor bus stops face significant cold exposure risk. Cold-weather closures in Montreal often occur without major snowfall, driven purely by dangerous wind chill values.
Montreal's school system is organized into French and English school service centres, each responsible for their own closure decisions based on local conditions and transportation safety.
The largest French-language school service centre in Quebec, serving over 114,000 students across Montreal island. The CSSDM makes centralized closure decisions and communicates through cssdm.ca, Radio-Canada, TVA, and automated parent notifications.
The largest English-language school board on Montreal island, serving tens of thousands of students. The EMSB makes independent closure decisions and announces through emsb.qc.ca, CTV Montreal, CBC Montreal, and automated family notification systems.
Serving the western part of Montreal island including Lachine, LaSalle, and the West Island communities, CSSMB makes independent decisions that sometimes differ from central Montreal boards due to varying local conditions.
School service centres in Laval (north of Montreal) and the South Shore (Longueuil, Brossard) make independent decisions. Bridge and tunnel conditions between these areas and Montreal island are a key factor in their closure decisions.
| Weather Factor | Low Impact | Moderate Impact | High Impact |
|---|---|---|---|
| Snow Accumulation | Under 5 cm | 5-15 cm | 15 cm+ (closure likely) |
| Freezing Rain | Trace amounts | 2-5 mm accumulation | 5 mm+ (closure likely) |
| Wind Chill | Above -20C | -20C to -30C | Below -35C (closure risk) |
| Road Conditions | Clear and treated | Partially icy | Black ice city-wide |
| Snowfall Rate | Under 1 cm/hr | 1-3 cm/hr | Over 4 cm/hr (storm conditions) |
Montreal school service centres and boards monitor Environment Canada weather forecasts beginning the evening before a predicted storm. Directors review projected snowfall totals, freezing rain timing, overnight temperature trends, and road condition reports from transportation contractors. School bus viability is the primary concern - if bus routes through residential neighbourhoods are unsafe, closures follow. Announcements typically come between 5:30-6:30 AM through service centre websites, Radio-Canada, TVA, CTV Montreal, CBC Montreal, and automated parent notification systems.
Run the calculator the night before a storm. Montreal school service centres typically announce closures by 6:00-6:30 AM. Check cssdm.ca and emsb.qc.ca for official announcements.
Freezing rain is the top closure trigger in Montreal - even small amounts create dangerous conditions. Our calculator factors freezing rain probability heavily into the closure score alongside snowfall totals.
Weather conditions vary across Montreal island and the surrounding region. Enter your postal code for the most localized Environment Canada forecast and snow day prediction for your school service centre.
Our calculator covers Montreal and the Greater Montreal Area, including:
Enter any Montreal area postal code to get a localized snow day prediction for your school service centre.
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