Fall 'Freeze' Probabilities (Jul. 31 - Dec. 31)


PORTOLA st, (047085)
Temp F Earliest 10% 20% 30% 40% 50% 60% 70% 80% 90% Latest
36.5 07/31 07/31 07/31 08/01 08/02 08/04 08/06 08/09 08/14 08/20 08/30
32.5 07/31 07/31 08/02 08/05 08/06 08/12 08/18 08/29 09/09 09/15 10/05
28.5 07/31 08/07 08/14 08/21 08/26 09/04 09/14 09/21 09/30 10/08 10/27
24.5 08/19 09/08 09/18 09/25 09/29 10/05 10/12 10/16 10/20 10/26 11/15
20.5 08/19 09/18 10/05 10/12 10/17 10/22 10/26 10/30 11/06 11/09 11/21
Graphic Output
 Earliest - Earliest 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 July 31 to 
                  Dec. 31 period or insufficient data to determine a date.
            07/31 means the minimum temperature can go below the threshold 
                  temperature any day during the July 31 to Dec. 31 period.
xx% - Percent probability that a minimum temperature below the threshold will occur on or before 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 been a year when the minimum temperature didn't go below the threshold temperature during the July 31 to Dec. 31 period or insufficient data to determine a date.

Western Regional Climate Center, wrcc@dri.edu