SnowDates

Data Sources

Primary sources

  • NOAA GHCN-Daily — daily snowfall observations from the Global Historical Climatology Network, maintained by NOAA's National Centers for Environmental Information (NCEI).
  • ACIS — the Applied Climate Information System, a web service operated by NOAA's Regional Climate Centers, used to retrieve station metadata and daily records.
  • NOAA 1991–2020 Climate Normals — SnowDates statistics use the same 30-season window for comparability with official normals.
  • U.S. Census Bureau ZCTA Gazetteer (2023) — ZIP Code Tabulation Area centroids powering ZIP code search.

Editorial data

Ski resort typical opening/closing dates, elevations, and typical snowfall figures are curated from resort-published information and historical season reports. They are estimates, not measurements — see the methodology.

The full station used for each city is listed on the station list and at the bottom of every city page.