snow pack: https://www.programmableweb.com/api/snotel-rpc-api
https://www.nrcs.usda.gov/wps/portal/wcc/home/ Welcome to the National Water and Climate Center Current Conditions: Precipitation | Streamflow | Snow Water Equivalent
historical monthly snowpack by region: https://www.nrcs.usda.gov/wps/portal/wcc/home/snowClimateMonitoring/snowpack/