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


GRAND CANYON NTL PRK, (023595)
Temp F Earliest 90% 80% 70% 60% 50% 40% 30% 20% 10% Latest
36.5 05/13 05/24 05/26 06/06 06/11 06/14 06/15 06/19 06/25 07/01 07/11
32.5 05/06 05/07 05/08 05/14 05/22 05/27 05/31 06/09 06/14 06/16 07/02
28.5 04/21 04/28 05/04 05/09 05/11 05/14 05/19 05/22 05/25 05/28 06/07
24.5 04/01 04/14 04/21 04/21 04/26 04/27 04/27 05/01 05/08 05/17 05/25
20.5 03/05 03/19 03/26 04/11 04/16 04/20 04/24 04/26 04/29 05/07 05/18
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