Can concrete, for footings and a slab, be successfully poured, without using additives or other weather control techniques, on any day(s) during this interval?
WsId Date TmaxF TminF TmeanF PrcpIn SnowIn CDD HDD GDD
18975 12/1/2009 50 28 39 0.26 N 0 26 0
18975 12/2/2009 52 28 40 0 N 0 25 0
18975 12/3/2009 66 30 48 1.42 N 0 17 0
18975 12/4/2009 62 30 46 0 N 0 19 0
18975 12/5/2009 50 30 40 T T 0 25 0
18975 12/6/2009 40 25 32.5 0.58 1.5 0 32.5 0
18975 12/7/2009 37 24 30.5 0 N 0 34.5 0

I don't understand all the equations but I can tell you that when the weather is too cold you cannot successfully pour concrete and have it cure properly. Any concrete company that you order concrete from can tell you at what temperature it is recommended to pour the concrete.

The rule in my state bridge construction experience was "40 degrees and rising", but we used concrete that had been mixed with hot water and the concrete temp had to be above 50 degrees.
I believe if you can meet the 40 and rising requirement, then immediately cure with insulation or artificial heat to keep the concrete between 50 deg and 80 deg for seven days, the concrete will perform well. Keeping covered with wet burlap is just as critical as temperature. If these recommendations don't meet the specifications or code for your particular project, go back to square one.