Driest Since: This column displays the last period and accumulated amount with precipitation totals less than or equal to the period of interest. Only those time periods that correspond directly to the period of interest are surveyed (for example, 30-day rainfall ending March 21st, 2003 are only compared to 30-day periods that ended on March 21st).

Wettest Since: This column displays the last period and accumulated amount with at least as much precipitation as the period of interest. Only those time periods that correspond directly to the period of interest are surveyed (for example, 30-day rainfall ending March 21st, 2003 are only compared to 30-day periods that ended on March 21st).