Here is what it looks like ...
We use dimes (for tens) and pennies (for ones) to build 75 cents (for the 75th day of school). We check the temperature and compare it to the temperature from the previous morning. Is it warmer or colder? How many degrees colder or warmer? Today a student correctly informed me that yesterday's -3 degrees Celsius was 6 degrees colder than today's 3 degrees Celsius!
Each day we add a weather symbol showing the weather that morning.