If It Never Rained Before The Flood [LOGIC ALERT!]

Is that supposed to imply that man is older than the seasons? Check it: no rain=no snow either, as well? If no rain or snow [but the flood rain's moisture was suspended in the atmosphere in a "canopy", not being released], then no reason for fall or winter, just summer all year round, all throughout time until the flood? Even the Dinos didn't see seasonal or temperature changes that are needed to sustain the ecological system?!
That's what I want to know from people that say "it never rained before the flood."
Do people even think of everything that THAT implies?