ZIP 35203 Zone 8a
Alabama · USDA zone 8a, average annual extreme minimum 10°F to 15°F.
Nearest qualified station: BIRMINGHAM AP, AL US (USW00013876), 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% | February 28 | Earlier date. A last 32°F on or after this day is common. |
| 50% | March 21 | Median. |
| 10% | April 8 | 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 30 | Earlier date. A first 32°F on or before this day is uncommon. |
| 50% | November 11 | Median. |
| 90% | December 1 | 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% | 262 |
| 50% | 236 |
| 90% | 211 |
28°F threshold
| 10% | 50% | 90% | |
|---|---|---|---|
| Last, on or after | March 26 | March 7 | February 14 |
| First, on or before | November 6 | November 24 | December 15 |
| Season at least | 293 days | 262 days | 235 days |
36°F threshold
| 10% | 50% | 90% | |
|---|---|---|---|
| Last, on or after | April 20 | April 3 | March 16 |
| First, on or before | October 21 | November 2 | November 17 |
| Season at least | 234 days | 212 days | 192 days |
Station BIRMINGHAM AP, AL US (USW00013876). 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 100%. Freeze dates are conditional on that threshold occurring. Elevation 187.5 m. The same probability language applies to the 28°F and 36°F rows when those dates passed the same quality checks.