We are busiest when it snows out.

No difference really

I think I've ventured out more on rainy days.

Tis the season....

First, pizza is the most versatile of meals - it can be enjoyed for breakfast, lunch, and dinner (and dessert!)

Second, my libido does not suffer from seasonal affective disorder.

"Winter, spring, summer or fall, all you've got to do is call, and I'll be there"

J. Taylor (?)

I really dont think weather has that much to do with it.  Its all in the condition of the libido and the weight of the wallet.

I usually have pre-booked a couple of days in advance.

Rainy or dark weather seems to encourage callers.

On sunny days with great weather (particularly at the beginning of spring and last days of summer) the phone seems to be quieter.

Like Jill says, snowy days are awesome.
When snow is anticipated, I can usually be found stocking up on candles and bottles of wine just before holing up in a suite to receive the undeterred brave with AWD and one track minds : ).

There are definitely observable trends in phenomena & events which affect call volume- weather is one of the most consistently predictable ones for me.