The Minimum Overnight Temperature is based on the Brunt Equation, sunset air and dew point temperatures. More information can be found on the Using the Brunt Equation page.
Using the Brunt equation, one can estimate the the minimum overnight temperature given the air & dewpoint temperatures at sunset.
Please enter the air and dew point temperatures at sunset in your location.
Sunsets for FAWN stations will begin around 7:45 PM. For increased accuracy, two observations are needed.