The North Carolina State Climatology Office has a great interactive map display for weather and
climate data covering the entire southeastern US.
This portal provides access to estimates of "normal" precipitation for any location in the contiguous United States. PRISM also provides estimates of total precipitation for each month and year since 1895.
The National Climatic Data Center has recently updated their website to make obtaining data
easier than ever.
The Florida Climate Center has released a new dataset showing the likelihood of large rain
events by ENSO phase for over 100 stations across the Southeast.