We have reached the average temperature for the year for Albany, in other words, the zero crossing point.

The earth is round. This means that the average daily temperature follows a sine wave, as spinning circles always produce sine waves. When you reach the zero crossing point heading down, that means the average temperature descends faster than any other time of the year.

This happens 23 days after the first day of calendar autumn due to the delay caused by the atmosphere and ground holding summer heat. The opposite happens in the spring – 23 days after the first day of calendar spring you get the maximum warm up.