Psychrometric Chart
This was modeled with and rendered in Grasshopper with Ladybug and Rhino. The Psychrometric chart is showing the comfortable area for the thermal zone in Las Vegas Nevada throughout a year span. There is also an additional chart that is showing the year period for temperature change in Las Vegas from the begining till the end of the year. The gradiant is the way it is because there is recorded data for every hour of the month.
Using this model could influence spin off the earth to be slower or faster I think it's west to east to slow the spin and would slightly increase dependent on factors of water flow in latitudinal direction.