OK...just walked in the door with my new thermometer to measure the soil temperature with.....these temperatures are taken at a depth of 10 inches (25cm) in the middle of my cement farm....in the shadiest spot, the temperature was 57.4F (14C), and the in the sunniest spot is 65.8F (18C)...I am thinking if it stays that way for the next few days and we keep the sunshine thing going, it will be plant out time.....by the weekend...was 83F (28C) sunny today, supposed to be 86 (30C) tomorrow and 88F Friday....I just thought, if I seal the tops of the block all the way around (sealing them will be easier than filling them), I will have a "thermos" cement farm...will have 5-6" (~13cm) of air inside the blocks all the way around and since the bottom is 8" off the ground and sealed, no cold ground can get to the soil in the bed...I have a totally insulated bed and I can use mulch on the top of the soil to keep the temperature in from the top...and the mulch will also keep my moisture in with the soaker hose buried 10" down......
enough ramblin'...I'm just sittin' here ponderin'......