Chet: Thanks. I do a bit of salmon fishing in April that can occur at or below freezing , and there's no doubt about the lines stiffening, but with wetsuit gloves on and guides icing up, I cannot say for sure what the overall impact is on the flyrod's casting. I can definitely tell you the effect on MY contribution to the process, and it ain't beneficial. Appreciate your insight.
brent

I have a St. Croix 7'6" 2-piece Legend Ultra IV that I built in 1999 and that is my favorite. Nice and light and it seems like others have posted in this thread about enjoying it. Have a old Diamondback blank they sent me after building a 3pc and having it snap on me first time out - it came from barrel at their VT location, so don't know what the model is, but nice moderate action - it was rated as a 4wt, but use it with 3wt DT line mostly. Have a Cabela's Three Forks 7'6" 3wt that I bought on closeout for $25 - couldn't pass it up (along with a 8' 4wt and 9' 5wt). I will be using that more this year as I was using more fiberglass the last few years.

Can't wait to get out, but I really dislike the cold here in MA - spring is on the way though.

Won't touch it. Your rod might feel a little crisper because the cold will make the resins a little more crystalline as well as make your line stiffer; unless you have a good coldwater trout line it's likely to clatter through the guides a little more. But it'll shoot better in the cold, because the harder line won't have as much friction against the guides.