After the end of the month the "NOAA this month" is the current month. Monthly summary is simply a monthly summary, there is no follow-on. After March and into April then the "NOAA this month" is April, NOAA summarize month gives you the option to select a month, even the current month or any previous month that you have data for. Monthly summary is re-creatable at any time for any month you have the data for.