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1.
1. The transitional season between summer and spring.

2. A temperature ranging between 67 and 78 degrees Farenheit, during a day in which the designated season does not feel like it should.
" I thought it was supposed to be winter weather today. Too bad it feels like sprummer."
by Lyndon Allen January 09, 2009
 
2.
Abnormally hot temperatures in the middle of an otherwise normal spring.
92 degrees in April? Sounds like another sprummer day.
by Liljoday April 28, 2009