Hurry Hill.. Intersting difference between the two years you show. When the season starts here in Central NH there's between 3 and 4 feet of snow (we're pretty high up). We always set taps first week of March on snowshoes. The big difference in flow here is the wind as far as I can tell. Last year we got less than 5 gal of sap per tap on gravity (<1800 gal on 380 taps). We had 8ish gal per tap in '08.