They're here -- https://www.johnnyseeds.com/growers-library/online-tools-calculators.html
At 6b, you should be about the same as me. I'm in this area - 6b/7a. 
Made it to the other end of the tunnel with grass/weed pulling.Took almost two hours, I didn't start until 8am - was supposed to be 6am but I was lazy. Kinda warm before I was done. Also need to kill the rest of the grass/weeds in the tunnel.
I had thought about "living pathways" but screw that. The entire tunnel will be mulched with something most of the year if not all the time. Now that all but the sides are pulled or short, I can use my black rubber mats and heavy black plastic to kill off the rest and cover with mulch as I go.
I'm trying to pull as much as I can out by the roots. Getting harder to do now that things are finally drying up.
Rearranged my controllers and have one I can put in the tunnel now that will read a temp sensor to get soil temp. Good to know for direct sowing sometimes.(98 frikkin degrees) Did everything I needed to do in the shed for that(with a fan on me) and will do the outdoors part when it's cooler.
I already have an outside air temp/humidity sensor. It says it's hot and humid LOL. Bit of a breeze today which helps.
Saw a Japanese Beetle today oh joy. I killed it but I doubt it was the only one I'll see.