Central Alberta
Edmonton's winter risk is dominated by long, deep cold spells rather than by single snowstorms, and buses are affected before schools are. The estimate below is loaded with live Edmonton forecast data.
Live Edmonton forecast estimate
Enter a location to compare tomorrow's snow, ice, temperature, wind and morning timing.
Local conditions
Edmonton lies well north of Calgary on the central Alberta prairie, far enough from the Rockies that chinooks reach it only weakly and infrequently. The consequence is that Arctic air, once it arrives, tends to stay: cold spells here run longer and deeper than in southern Alberta. The city's high latitude also means very short winter days, so morning bus runs happen in darkness and afternoon light fades early, which compounds the exposure question for students waiting outdoors. The surrounding prairie is flat and open, so blowing snow is a routine visibility hazard.
What actually drives a decision
Rather than a single cold morning, Edmonton often faces a week of it. Extreme cold warnings are a routine part of the season, and the safety question for students waiting or walking outdoors is continuous rather than isolated. The temperature and wind chill factors are the rows to read first.
At Edmonton's latitude, mid-winter bus runs take place before sunrise. Reduced visibility from darkness combined with blowing snow is a different operational problem from the same conditions in daylight, and it is one reason cancellations are decided early in the morning.
Sustained deep cold causes mechanical problems, and buses that will not start constrain service regardless of how clear the roads are. This is an operational limit outside the weather model, and it is a common reason for route-level cancellations during a cold snap.
The routes radiating out of Edmonton cross long stretches with no windbreak, and in midwinter the sun sits low enough that blowing snow and glare can arrive together. Divisions weigh whether a bus could stop safely on those roads rather than simply whether the pavement is clear, and that judgement has to be made before dawn.
The forecast for the coordinates above is scored against six weighted factors: snow and ice, temperature, wind chill, morning timing, area and routes, and school level. Around Edmonton the rows that most often carry the number are temperature, wind chill. Every factor appears in the result with its own value, score bar and published weight, so a percentage is never presented without the reasoning behind it. The methodology page documents each threshold, and the accuracy and limitations page sets out what the model cannot observe.
This site does not publish closure thresholds for any school system, because those are operational judgements rather than published numbers. What it can do is point you at the organisations that actually decide. Around Edmonton, AB those include:
Treat the estimate on this page as a reason to prepare and to keep checking, never as an announcement. A school system can close buildings, delay the start, cancel transportation only, dismiss early or move to a different learning format, and those outcomes are not interchangeable.
Primary sources for weather warnings and road conditions covering Edmonton. School decisions still come from the systems listed above.
Edmonton questions
The estimate reads the forecast, not the fleet. Edmonton Public Schools and Edmonton Catholic Schools publish their own status, and during a deep cold snap the binding constraint is often buses that will not start rather than the condition of the roads.
Edmonton is farther north and farther from the Rockies, so chinook winds reach it only weakly and rarely. Without those warm downslope interruptions, Arctic air that settles over the city tends to persist much longer.
It changes how often the question comes up. A single frigid morning is manageable; a week of extreme cold warnings puts continuous pressure on transportation and on vehicles that struggle to start, so route cancellations can recur day after day. Divisions publish their own criteria and this site publishes no threshold.
No. The model scores forecast weather and broad local context. Short winter daylight is real and relevant in Edmonton, which is why this page states it plainly rather than implying the percentage covers it.
On the transportation pages of Edmonton Public Schools and Edmonton Catholic Schools, which publish route and system status during extended cold and after snowfall. The calculator estimates weather pressure only and cannot read those service feeds.
Still deciding what to do with the number? Read how schools make the final call and the guide to the best times to check a forecast.