% Probability of Indicated Temperature or Lower on or After Date

  90% 75% 50% 25% 10%
36 May 1 May 9 May 22 June 1 June 9
32 April 16 April 20 May 5 May 13 May 18
28 March 23 April 7 April 14 April 22 May 6
24 March 4 March 16 March 30 April 11 April 21
20 Feb. 3 Feb. 16 March 4 March 18 March 29