Cut 2 x 2 1/2" neutral squares and 1 x 4 1/2 xx 2 1/2" coloured rectangle from the your Temperature legend to match the days high temperature.
Draw a diagonal line on the wrong side of the neutral squares.
Put a square on the left side of the rectangle as per my picture.
Sew along the outside of the line. See how my stitched line is just touching my drawn line.
Trim the corner off with a 1/4" seam allowance. Fold the neutral triangle back to reform the rectangle.
Place the other square on the other corner , making sure your diagonal line running from the centret to the bottom right corner
Sew on the outside of this line like you did with the first corner. Trim the corner off leaving a 1/4" seam allowance from the stitched line.
This completes your block.