« on: February 27, 2009, 08:30:32 pm »
A friend of mine is fond of saying; "Climate is what you expect, weather is what you get". You can make the odds in your favor a bit by assuming the Northern Tier will be cold in the fall, winter and spring and the Southern Tier will be hot in the summer. (no surprises there huh?). So, make your northern crossing from June to August and the Southern crossing from December through March.
That said, it can be COLD in the winter in the South. I have family in central Florida and it has been in the 20's several times this year. Also, I was on a week long bike trip in Ohio in late June a few years ago and the overnight temperatures fell into the mid-30's twice in that week.
Upshot, be prepared with adequate cold weather clothing no matter where you are or when.