% Probability of Indicated Temperature or Lower on or After Date

  90% 75% 50% 25% 10%
36 May 20 May 29 June 5 June 13 June 19
32 April 26 May 5 May 10 May 20 May 27
28 April 13 April 20 April 30 May 9 May 15
24 March 20 March 30 April 11 April 20 April 30
20 Feb. 23 March 6 March 19 March 29 April 6