U.S. Historical Climatological Series

Historical Climatology Series (HCS) 4 and 5 is a series of digital products produced by the National Climatic Data Center (NCDC). HCS 4 and 5 is a subseries in a larger series of the U.S. Climate Normals for 1971-2000. HCS 4-1 is state, regional and national monthly and annual temperatures, weighted by area, for the normals period 1971-2000, plus earlier thirty-year normals periods starting in 1931. HCS 4-2 is similar to HCS 4-1, except it is for precipitation. HCS 4-3 is similar to HCS 4-1 and 4-2, except it is state, regional and national seasonal temperatures and precipitation. HCS 5-1 is state, regional, and national heating degree days, weighted by population. HCS 5-2 is similar to HCS 5-1, except it is for cooling degree days. The series is archived as the single digital data set DSI-9641E.