Snow Day Calculator App! Get the prediction power of the Snow Day Calculator in an App. Using just your zip code, David Sukhin's famous Snow Day Calculator will predict the chance of a snow day. The Snow Day Calculator automatically pulls weather information from the National Weather Service and uses a carefully developed formula to give super accurate snow day predictions for your school! Predictions always use the most recent weather information and new predictions become available at noon each day. You can also sign up for Snow Day Notifications for up to three days in advance and join your school group for even more accurate predictions! What's your chance for a snow day tomorrow? Some optional features of the app may occasionally use location services which may affect your battery life. You have the option to enable and disable these features at any time.