I felt like the temperature quilts I looked at had too much information using 365 days. They had the warm colors in the middle and cooler colors at both ends.
I used the NOAA website to obtain my temperatures. (I used Excel app to keep track.)
Since the temperatures in south Texas vary so much, I recorded the highs and lows on my birthday in October, which is a very unpredictable temperature month. I went back to 1960 and arranged the columns by decades: 60s, 70s, 80s, etc. I put the day's low in the center of the square and then set on point. Same day in October ranged from 95s to 50s!!
I used my new Bernette to "write" the date, repeatedly, on one side of the binding; I "wrote" the legend/key on the corresponding color on one side of binding; I "wrote" my name across the bottom; and, finally, I labeled the decades on the top binding.