Po Valley and Central Valley Daily Climate and Pollution Data

Daily averages for precipitation, dew point, dew point depression (DPD), sea level pressure (SLP), average temperature, max temperature (tmax), minimum temperature (tmin), visibility, wind speed, and NOx/SO2/PM concentration. Data looks at fog season averages for variables, eg November-March. Daily averages were derived from hourly measurements. An daily measurements for all continuous variables were created by averaging measurements taken every 3 hours (0:00, 3:00, 6:00, 9:00, 12:00, 15:00, 18:00, 21:00). 7 of 8 hourly observations were required to calculate daily average.Time series length varies by location, but near complete data is located for all sites from approximately 1980-2010.