I personally have been observing the details trickling in about the solar minimum. It makes me predict a longer cooler spring. I have not checked - but I believe Feb had no sunspot activity so something of a record. Plus
@Chuck might haunt me if I planted before the soil temps could "BUFFER" a temp change, which is a little past some of the soil temp posts we have seen on the board in the recent period. Its ok that a soil temp arrives at a particular number, yet a completely different thing if it stays that number. I speculate that grace period should be 2 to 4 weeks.