Northwest Territories Snow Day Predictor — Yellowknife, Hay River, Inuvik and All NWT Communities
NORTHWEST TERRITORIES Snow Day Predictor
Canada's most accurate snow day predictor
Check tonight’s school closure probability for schools across the Northwest Territories. Our predictor uses live Environment Canada weather data calibrated for NWT extreme cold, blizzard conditions, and ground blizzard events — updated every hour. Yellowknife is the coldest major city in Canada by average annual temperature (January average: −26.8°C, record low: −51.2°C). In the NWT, extreme cold is the primary school closure trigger, not snowfall — our algorithm is calibrated accordingly.
NWT Snow Day Triggers — Extreme Cold, Blizzards, and Ground Blizzards
- Extreme Cold (primary trigger): At −40°C apparent temperature, exposed skin can freeze in 10–15 minutes. A 10-minute walk to school at these temperatures is a genuine health risk for children. Our algorithm applies a 2.0× wind chill multiplier for NWT communities — the highest in our Canadian database.
- Blizzard and Ground Blizzard Conditions: On flat NWT terrain, high Arctic winds lift previously fallen snow from the tundra, creating near-zero visibility at ground level while skies may be clear overhead. These ground blizzards can develop within minutes and close schools even with zero new snowfall.
- Isolated Highway Access: Communities connected by the Ingraham Trail, Mackenzie Highway, or winter roads depend on these routes for school transportation. Blizzard conditions on these routes trigger closures even when community weather is manageable.
Extreme Cold Guide for NWT Schools
| Apparent Temperature (Wind Chill) | Typical NWT School Response |
|---|---|
| −20°C to −30°C | Normal operations. Standard winter protocol. |
| −30°C to −38°C | Enhanced monitoring. Outdoor activities may be shortened. |
| −38°C to −45°C | Closure review triggered. High probability of cold-day closure. |
| −45°C to −50°C | Very likely full closure. Most NWT districts close. |
| Below −50°C | Full closure expected. Outdoor exposure to be avoided entirely. |
- Yellowknife (YK1 / YK Catholic): 5–10 closures per year — extreme cold events, some blizzard events
- Hay River: 5–10 closures per year — similar to Yellowknife
- Inuvik: 8–15 closures per year — Arctic Circle location, polar darkness, flat delta blizzards
- Fort Smith: 5–10 closures per year — extreme cold, highway access
NWT School Districts — Who Decides Closures
- Yellowknife Education District No. 1 (YK1) — Sir John Franklin HS, Range Lake North, Ruth Inch Memorial, William McDonald, École J.H. Sissons. yk1.nt.ca | Announces: 7:00–7:30 AM | Radio: CKLB 101.9 FM, CBC North Yellowknife 1340 AM | Twitter/X: @YK1Schools
- Yellowknife Catholic Schools (District No. 46) — St. Patrick High School, Weledeh Catholic, École Allain St-Cyr. ycs.nt.ca | Announces: 7:00–7:30 AM | Radio: CKLB 101.9 FM, CBC North 1340 AM
- Hay River School District — Diamond Jenness Secondary, Harry Camsell School. hayriverschooldistrict.ca | Announces: 7:00–7:30 AM | Radio: Local radio + district website
- Inuvik District Education Authority — East Three Secondary, Samuel Hearne Secondary. Announces: 7:00–7:30 AM | Radio: CBC North Inuvik
- Tłı̨chǫ Community Services Agency (TCSA) — Tłı̨chǫ community schools. tcsa.ca | Check individual community pages
Important: Unlike Ontario boards that announce by 6:00 AM, NWT districts typically announce by 7:00–7:30 AM. Check NWT highway conditions at dot.gov.nt.ca for remote community route status. Always supplement our prediction with Environment Canada Extreme Cold Warnings.
NWT Community Predictors
- Yellowknife Snow Day Predictor — YK1, YK Catholic Schools
- Hay River Snow Day Predictor — Hay River School District
- Inuvik Snow Day Predictor — Inuvik District Education Authority
How to Use This Predictor for NWT
- Wind chill is the number that matters most: A clear, calm −45°C night closes NWT schools more reliably than 20 cm of snow. Check the apparent temperature first.
- Check Environment Canada Extreme Cold Warnings: At weather.gc.ca — warnings are issued at the community level for NWT.
- For remote communities: Check NWT highway conditions for route status to your community.
- Check at 5 AM: Our model updates overnight with actual NWT station data for the most accurate pre-announcement prediction.
Frequently Asked Questions — NWT School Closures
What is the coldest temperature ever recorded in Yellowknife?
Yellowknife’s record low is −51.2°C, recorded in February 1947. Modern winters regularly see temperatures below −40°C for multi-day periods. Yellowknife is the coldest major city in Canada by average annual temperature, with a January average of −26.8°C — colder than Edmonton, Winnipeg, and every other Canadian city.
What temperature closes schools in Yellowknife?
Based on historical closures, YK1 and YK Catholic Schools typically review closures when apparent temperature approaches −38°C to −45°C sustained through morning hours. An active Environment Canada Extreme Cold Warning is the clearest signal. No official published threshold exists — the decision is made by district authorities based on field conditions.
How are NWT school closure announcements made?
YK1 (yk1.nt.ca) and YK Catholic Schools (ycs.nt.ca) announce via their websites and local radio. CKLB 101.9 FM and CBC North Yellowknife (1340 AM) are the primary broadcast channels. Announcements come by 7:00–7:30 AM — slightly later than Ontario’s 6:00 AM standard.
What is a ground blizzard?
A ground blizzard occurs when strong Arctic winds lift previously fallen dry snow from flat tundra, creating near-zero visibility at ground level while skies may be clear above. Ground blizzards can develop within minutes on calm days when wind speeds increase rapidly. They are particularly common in flat NWT terrain north of Yellowknife and in the Inuvik area, and are as significant a closure trigger as conventional snowstorms.