Your quilt
@Celia , your Rules!!!!
Simple blocks ... how about squares or rectangles?
Just consider the size of the overall quilt ... 365 blocks in 12 sections. ... If you want to separate the months you need some blanks too, as Im doing.
Im using several fabrics of the same kinda hue for same temps, basically whatever I had to hand ... but you can use one colour per degree, 3 degrees or 5 degrees ... your quilt, your rules!!!
Mine is going to be a full size double and Im waiting til the end of June to decide whether to make the quilt one whole year on one side or double sided... as Im QAYGing it Im not too worried about size.