ZIP 78640 Zone 9a
Texas · USDA zone 9a, average annual extreme minimum 20°F to 25°F.
Nearest qualified station: SAN MARCOS, TX US (USC00417983), 10.9 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% | February 1 | Earlier date. A last 32°F on or after this day is common. |
| 50% | February 28 | Median. |
| 10% | March 21 | 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 8 | Earlier date. A first 32°F on or before this day is uncommon. |
| 50% | November 29 | Median. |
| 90% | December 21 | 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% | 307 |
| 50% | 273 |
| 90% | 243 |
28°F threshold
| 10% | 50% | 90% | |
|---|---|---|---|
| Last, on or after | March 8 | February 13 | January 9 |
| First, on or before | November 19 | December 15 | January 13 |
| Season at least | 345 days | 306 days | 270 days |
36°F threshold
| 10% | 50% | 90% | |
|---|---|---|---|
| Last, on or after | April 5 | March 14 | February 23 |
| First, on or before | November 1 | November 16 | December 4 |
| Season at least | 272 days | 246 days | 218 days |
Station SAN MARCOS, TX US (USC00417983). Completeness flag S, 27 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 202.7 m. The same probability language applies to the 28°F and 36°F rows when those dates passed the same quality checks.