ZIP 94559 Zone 9b
California · USDA zone 9b, average annual extreme minimum 25°F to 30°F.
Nearest qualified station: NAPA STATE HOSPITAL, CA US (USC00046074), 2.5 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% | January 3 | Earlier date. A last 32°F on or after this day is common. |
| 50% | February 12 | Median. |
| 10% | March 13 | 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% | November 15 | Earlier date. A first 32°F on or before this day is uncommon. |
| 50% | December 4 | Median. |
| 90% | January 4 | 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% | 338 |
| 50% | 299 |
| 90% | 257 |
28°F threshold
| 10% | 50% | 90% | |
|---|---|---|---|
| Last, on or after | February 13 | January 11 | December 16 |
| First, on or before | December 1 | December 19 | January 23 |
| Season at least | 365 days | 348 days | 316 days |
36°F threshold
| 10% | 50% | 90% | |
|---|---|---|---|
| Last, on or after | April 19 | March 27 | February 26 |
| First, on or before | October 31 | November 17 | December 4 |
| Season at least | 272 days | 236 days | 206 days |
Station NAPA STATE HOSPITAL, CA US (USC00046074). Completeness flag S, 28 years used for the 32°F dates. NCEI’s annual probability of at least one day at or below 32°F is 98.4%. Freeze dates are conditional on that threshold occurring. Elevation 10.7 m. The same probability language applies to the 28°F and 36°F rows when those dates passed the same quality checks.