A: Let's start with the NOAA/NCDC/GHCN/v2beta dataset for New York City as an example.
Step 1. Click on "Expert Mode" in the table at the top of the page. Check Step
Step 2. Below the text that is already in the text box
enter the following lines:
You have just calculated annual precipitation totals for the entire time
series for New York City.
T 12 splitstreamgrid
[T] sum
and then click "OK".
Check Step
Step 3. If you had wanted to limit
the data to specific years (e.g. 1980-1989), then you would have wanted
to either use the Data Selection option first (as described in another
Q&A and in the
Data Library Tutorial)
or put the following line above those in Step 2:
T (Jan 1980) (Dec 1989) RANGE
CAUTION: If there are any missing values, then your annual totals will be artificially low.