This temperature blanket can be made using any hook size, I just use G with a single stitch. This blanket shows the temperatures of the year using a bar graph method with the lows below the highs on the row then the background color.
When changing colors tie or slip stitch into the next color.

Choose your favorite 11 colors for this pattern.
1 will be designated for the background color.
I changed colors every 7 degrees in this blanket.
3 colors per row.