1. Annual Mean Number of Days with Temp. less than 32 Deg F, Arizona, 1961-1990 Datasets University Of Arizona Public content unfold_more 1961. National Climatic Data Center (U.S.). The data set was computed using data from the National Climatic Data Center's Cooperative Summary of the Day (TD-3200) database (NCDC, 1995). The o... National Climatic Data Center (U.S.).
