They may well run on a warm day, irregardless of what the calendar says. The trick is to time the process so that you catch a run, not just a warm day. Once you drill that hole, the timer starts. Drill too early to catch a brief warm spell, and the hole may dry up before the real season begins.

"Forget pounds and ounces, I'm figuring displacement!"

If we accept that: MBG(+)FGSF(=)HBG(F1)
And we surmise that: BG(>)HBG(F1) while GSF(<)HBG(F1)
Would it hold true that: HBG(F1)(+)AM500(x)q.d.(=)1.5lbGRWT?
PB answer: It depends.