Hope you don't mind my adding my two cents (which is getting harder to do since we no longer use pennies....)
It went from -15 C to a scorching -6 C here today (Kawartha's) ! Last year I tapped March 5th and the pails were overflowing on the 9th! Well tapped a few just because it seemed like the thing to do yesterday and saw lots of sun today but no heat today :{(
I have been snowshoeing to the bush the last two months packing my trail and will be pulling my sled behind me when we do see some BTU's !!