Spring 'Freeze' Probabilities (Jan 1 - Jul 31)


SAINT HELENA, CALIFORNIA (047643)
Temp F Earliest 90% 80% 70% 60% 50% 40% 30% 20% 10% Latest
36.5 02/06 03/24 04/05 04/13 04/16 04/27 04/29 05/05 05/10 05/18 06/12
32.5 01/07 02/02 02/15 03/12 03/21 03/30 04/02 04/09 04/21 04/28 05/05
28.5 **/** **/** 01/05 01/12 01/28 02/07 02/15 03/05 03/10 03/16 04/08
24.5 **/** **/** **/** **/** **/** **/** 01/06 01/19 01/28 02/04 03/05
20.5 **/** **/** **/** **/** **/** **/** **/** **/** **/** **/** 01/22
Graphic Output
 Earliest - Earliest date when a minimum temperature below the threshold occurred.
            **/** means there has been a year when the minimum temperature didn't
                  go below the threshold temperature during the Jan. 1 to July 31 
                  period or that there was insufficient data to determine a 
                  date.

xx% - Percent probability that a minimum temperature below the threshold will occur on or after the given date. **/** means non-occurrence of the threshold or insufficient data to determine a threshold.
Latest - Latest date when a minimum temperature below the threshold occurred. **/** means there has never been a year when the minimum temperature went below the threshold temperature during the Jan. 1 to July 31 period or insufficient data to determine a date. 07/30 means the minimum temperature can go below the threshold temperature any day during the Jan. 1 to July 31 period.

Western Regional Climate Center, wrcc@dri.edu