Mother Nature pulled the best one in Boston, think it was 1997. We got an 18 inch snowstorm. It was 70 degrees and sunny on March 31.
Some incredible weather changes:
Extreme Winter Sudden Change Days
When the cold front associated with a winter low-pressure system ushers in the blast of cold air of an arctic outbreak, the local air temperature can drop precipitously in a few hours. There are many recorded instances of extreme temperature drops, but here are a few to chill your bones.
Browning, Montana: In 24 hours over January 23 to 24, 1916, the temperature dropped 100 Fahrenheit degrees (55.6 Celsius degrees) from 44 oF (6.7oC) above zero to minus 56 oF (-48.9oC)
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Oklahoma City, Oklahoma: A classic Blue Norther hit Oklahoma on November 11, 1911 (11/11/11!!). In a few hours time, temperatures plunged from a balmy, and record, high of 83 oF (28oC), to a record low of 17 oF (-8oC). By the next morning the temperature fell to 14 oF (-10oC) — a drop of 69 Fahrenheit degrees (38.3 Celsius degrees) in less than 24 hours. This event is the only date left in the Oklahoma City record books on which the existing record high and record low temperatures for the date occurred on the same day.
Rapid City, South Dakota: On the morning of Jan. 10, 1911, the temperature fell 62 Fahrenheit degrees (34.4 Celsius degrees), from 49 oF (9.4oC) at 6 a.m. to -13 oF (-25 oC) at 8 a.m. From 7 AM to 7:15 AM that same day, Rapid City's temperature plunged from 55 oF (12.8 oC) to 8 oF (-13.3 oC) — a 47 Fahrenheit degrees (26 Celsius degrees) temperature drop in 15 minutes.
http://www.islandnet.com/~see/weather/elements/arcticoutbreak.htm