Moist air holds heat better than dry air.
114
Dirty snow melts faster than clean.
350
Circumhorizontal arcs (loosely known as fire rainbows) are the rarest of all naturally occurring atmospheric phenomena.
21
-40 degrees Celsius is equal to -40 degrees Fahrenheit.
96
The winter of 1932 in the US was so cold that Niagara falls froze completely solid!
442