Analysis of 35 years observed trends in summer time daily maximum and minimum temperatures in two non attainment California air basins showed coastal cooling and inland warming. To study the impact of these results on the energy consumption we analyzed the summertime cooling degree days (CDD) and winter time heating degree days (HDD) of California long term observed temperatures. In this research historical surface 2-m air temperature data analyses consist of long-term data records, from 159 locations in California, each with data period of 1970–2006 of daily average, minimum, and maximum data records. The primary sources of such data include...