Sioux Falls, South Dakota Snow Day Calculator
Real-time probability that schools in Sioux Falls, South Dakota will be cancelled tomorrow, based on live forecast data and local closure thresholds.
It's 60°F — no snow day expected.
No Snow Day Risk
Real-time probability that schools in Sioux Falls, South Dakota will be cancelled tomorrow, based on live forecast data and local closure thresholds.
It's 60°F — no snow day expected.
10–18 inches, or wind chill below −30°F
Sioux Falls has one of the highest snow-closure thresholds in the country. Districts here regularly hold classes through 6–8 inch events that would close schools in any mid-Atlantic city. The real closure trigger in South Dakota is wind chill: sustained values below −30°F trigger "cold day" cancellations under state safety guidance, because school buses and waiting children can't safely function in polar-vortex cold regardless of snow cover.
Schools in South Dakota are built — both culturally and infrastructurally — for severe winter. Bus fleets have engine-block heaters, diesel is blended for sub-zero temperatures, and most families have winter gear good to −20°F. This means snow accumulation alone rarely closes Sioux Falls schools. A foot of powder in Sioux Falls produces clean, drivable roads within hours because plow fleets are sized for this climate.
What actually stops Sioux Falls schools is polar-vortex cold — when Arctic air masses drop south from Manitoba and wind chills reach −30°F or lower. Under those conditions, a child left at a bus stop can frostbite in minutes. The National Weather Service issues "dangerous wind chill" advisories that trigger district-level reviews, and when sustained wind chills are forecast below −35°F, closures are almost automatic.
Sioux Falls averages 42 inches of snow per year across a 5–6 month winter season. Despite that volume, schools typically close only 1–3 times per winter, with cold-day closures outnumbering snow-day closures.
SnowSense™ models wind-chill-driven closures separately from accumulation-driven closures because South Dakota is different. Live probability for Sioux Falls refreshes every 30 minutes and accounts for both.
South Dakota · 296 words of Sioux Falls-specific context
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