This may be a little off topic. And it's not meant to add to or detract from the rainfall theories being discussed.
Here's a little data to add to your questions.
I queried the May rainfall totals from the NWS offices on the FL Peninsula.
Rainfall totals for May 2005 vs May 2004,
and the departure from normal for the month of May

Location____May '05____May '04_____May'05 departure from Normal

Key West_____1.25"____ 0.83"______-2.23"
Marathon Key_3.20"_____0.74"______-2.52"
W Palm Bch___7.48"_____2.89"______+2.09"
Miami_________7.47"____2.45"______+1.95"
Ft Lauderdale__3.28"_____0.74"______-3.05"
Naples________1.46"_____0.64"______-2.75"
Daytona Bch___7.97"_____0.49"______+4.71"
Orlando_______4.57"_____1.91"______+0.83"
Melbourne_____4.09"_____0.99"______+0.15"
Vero Bch______4.80"_____0.09"______+1.00"
Ft Myers_______2.62"_____0.47"______-0.80"
Sarasota_______3.61"_____0.97"______+0.76"
Tampa_________3.61"_____1.44"______+0.76"

http://www.srh.noaa.gov/#