Frost Alert
Frost occurs when a surface in humid air is cooled to freezing temperature
(below O° C) and below dew point
[https://www.weather.gov/arx/why_dewpoint_vs_humidity#:~:text=The%20dew%20point%20is%20the,(RH)%20of%20100%25.&text=For%20example%2C%20a%20temperature%20of,a%20relative%20humidity%20of%