Mark, sorry to hear about the bean tragedy.
Outside temp means alot. I have one roaster/popper that will barley hit first crack when its real cool outside. Solution: I put that roaster in a small, shallow box and run another one behind it, blowing hot air into the box. Now its drawing in warmer air and increasing my roasting temp. Works very well.
I run this crazy contraption while my better roaster is cooling with a fan blowing into it.