Cumulative summary data files

Cumulative summary data files provide hourly average and monthly average summaries of the data. Each file covers the entire period for which data has been analyzed. Each cumulative summary file contains data from only one type of measurement.

Data are presented in two sections.

The first section presents the average hourly data for each month of the year. These data are obtained from the monthly average hourly values from all years for which data are available.

The second section contains monthly average daily data for the same measurement. Months with less than 15 days of good data are flagged with an asterisk.

These files list the period for which the data are available, and the monitoring station name along with the latitude, longitude, and altitude.