ZIP 98371 Zone 8b
Washington · USDA zone 8b, average annual extreme minimum 15°F to 20°F.
Nearest qualified station: MCMILLIN RSVR, WA US (USC00455224), 5.3 miles from the Census ZCTA internal point for this ZIP.
Outside the median season Growing seasonTicks: 10%, 50%, and 90%
Last 32°F in spring
NCEI’s probability is the chance the last spring minimum of 32°F or lower occurs on or after the date.
| Probability | Date | How to read it |
|---|---|---|
| 90% | March 23 | Earlier date. A last 32°F on or after this day is common. |
| 50% | April 11 | Median. |
| 10% | April 29 | Later date. A last 32°F on or after this day is uncommon. |
First 32°F in fall
NCEI’s probability is the chance the first autumn minimum of 32°F or lower occurs on or before the date.
| Probability | Date | How to read it |
|---|---|---|
| 10% | October 13 | Earlier date. A first 32°F on or before this day is uncommon. |
| 50% | October 30 | Median. |
| 90% | November 17 | Later date. A first 32°F on or before this day is common. |
32°F growing-season length
Days between the last spring 32°F and the first autumn 32°F. The figure is a length the season meets or exceeds at that probability, from NCEI, not a subtraction done on this site.
| Probability the season is at least this long | Days |
|---|---|
| 10% | 226 |
| 50% | 202 |
| 90% | 177 |
28°F threshold
| 10% | 50% | 90% | |
|---|---|---|---|
| Last, on or after | April 8 | March 16 | February 19 |
| First, on or before | October 28 | November 14 | December 8 |
| Season at least | 279 days | 244 days | 213 days |
36°F threshold
| 10% | 50% | 90% | |
|---|---|---|---|
| Last, on or after | May 17 | May 1 | April 17 |
| First, on or before | September 30 | October 12 | October 31 |
| Season at least | 186 days | 163 days | 142 days |
Station MCMILLIN RSVR, WA US (USC00455224). Completeness flag R, 24 years used for the 32°F dates. NCEI’s annual probability of at least one day at or below 32°F is 100%. Freeze dates are conditional on that threshold occurring. Elevation 176.5 m. The same probability language applies to the 28°F and 36°F rows when those dates passed the same quality checks.