Here is the one I completed for 2023 using HST. The HST were 4" and I put the high temp in upper left or right with the low in the lower left or right. The quilt is 19 squares across and 22 down making 76x88. There are some squares that are a single color as the high/low fell into the same temp range. I used a range of 5 degrees to make more interesting. The month squares (post it notes) were solid color and matched the high temp adjoining them. I'm in process of making a 2024 quilt using same colors and temp ranges with a different pattern. I only have up to May finished as I haven't kept up with it every week as I did with the first one. I use the Weather Channel website for my temps the main thing is to pick 1 site to use as differnt sites can have a range of 5 - 10 degrees difference.
https://weather.com/