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1. Yes it was hot & humid. Overnight temperatures around 75F with nearly 100% humidity. Daytime highs around 90F plus or minus a degree or two. I would start sweating even starting out, but it often wasn't too bad until 10am or so - and hence we tried to do much of our cycling before then. Longest gap between lodging was 104km and that day I cheated at 54km to get a ride (wunderground told us 92F and heat index of 109F after arrival).
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Sounds like your trip was a bit warmer by a few degrees than the trip I did in February of 2017 in southern Florida. Dewpoints were upper 60s to lower 70s the whole time we were there. We started at Marco Island, rode East through Big Cyprus, then in a semi-urban area we rode south and went into the Florida Everglades, then back out of the Everglades and followed the Florida Keys to Key West. Took the ferry back to Marco Island where our vehicle was parked. For us, the bugs were horrendous in Big Cyprus and the Everglades, but not bad in the Keys. We camped, almost never were in air conditioning.