Spring 'Freeze' Probabilities (Jan 1 - Jul 31)
ICE HARBOR DAM, at (453883)
| Temp F |
Earliest |
90% |
80% |
70% |
60% |
50% |
40% |
30% |
20% |
10% |
Latest |
| 36.5
| 04/03
| 04/15
| 04/18
| 04/21
| 04/26
| 04/29
| 05/02
| 05/07
| 05/09
| 05/13
| 05/22
|
| 32.5
| 03/15
| 03/25
| 03/28
| 04/03
| 04/07
| 04/10
| 04/12
| 04/17
| 04/21
| 04/23
| 05/16
|
| 28.5
| 02/06
| 02/28
| 03/08
| 03/12
| 03/15
| 03/19
| 03/25
| 03/28
| 04/03
| 04/12
| 04/24
|
| 24.5
| 01/10
| 01/15
| 01/30
| 02/07
| 02/22
| 03/02
| 03/07
| 03/12
| 03/17
| 03/25
| 04/24
|
| 20.5
| **/**
| 01/03
| 01/14
| 02/01
| 02/09
| 02/12
| 02/24
| 02/27
| 03/03
| 03/06
| 03/25
|
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