Anybody know if there is a "rule of thumb" for how many days a maple tree should experience freezing temps during a winter season prior to tapping? I'm thinking of tapping earlier this year (located in Eastern Ontario, Canada), sometime around mid to late January...but we're having some unseasonably warm weather at the moment...much of it above freezing. Heck, the temps are above 0C (32F) during the day and below freezing at night...normally this would make me thrilled...if it were late February or early March!