If your bike is going to sit at all (even a couple of days) and the temps are dropping down to 30 (F) or below, just bite the bullet and get a tender. Then it won't matter how long the bike sits or how low the temperature goes. Twenty-five bucks is as cheap as that kind of insurance gets.
A second benefit is that keeping a battery at (or near) full charge gives it extra life. I finally had to replace the battery in my Trophy at 7 years old. It was always on a tender when parked at home, and it always started.
AMA# 289558, COP#0001, BIR#47
'97 Trophy 3, '98 Tiger, '03 Speedie