1. October 2026

   A new prediction engine

   • We rebuilt the engine behind every snow day chance and tested it against real closure decisions from past winters, district by district. See how accurate it is.
   • Far fewer false alarms: in those tests the old engine called for a snow day more than twice as often as schools actually closed.
   • Chances that mostly track what happens: in the same tests, the share of nights that ended in a snow day stayed near the chance shown, and the accuracy page shows where it didn't.
   • Chances for the next few school days, not only tomorrow.
   • Delay chances checked against real school records, and early dismissal chances that show up far less often. Early dismissals are rare and seldom recorded, so that number stays a rough guide.
   • Environment Canada weather alerts now appear for Canadian locations.
2. September 2026

   Every district and school

   • Pages for more than 140,000 schools and school districts in the US and Canada, each with its own snow day chance.
   • Canadian school boards, with their own pages.
   • The National Weather Service renamed its cold weather alerts in late 2024. Cold Weather Advisories and Extreme Cold Warnings now count the same way the old names did.
   • Steadier during big storms, when everyone checks at once.
3. March 2026

   Sharing and faster pages

   • Share your prediction straight from the result card, or copy a link to it.
   • Faster city, state and province pages.
   • Pages no longer jump around while they load.
4. February 2026

   The first version

   • Snow day chances for any US or Canadian location, by zip code, postal code or place name.
   • Forecasts and winter weather alerts from the National Weather Service for US locations.
   • Search across more than 225,000 places in the US and Canada.
   • A privacy policy: no accounts, and no personal information collected.

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