I am waiting for a day where it hits 100 degrees and then drops to 0 deg within a couple of minutes.
According to Wikipedia:
Rapid City, South Dakota, holds two weather records — fastest temperature rise of 49 °F (27 °C) in 2 minutes on January 22, 1943, and fastest temperature drop of 47 °F (26 °C) in 5 minutes on January 10, 1911.