ZIP 39507 Zone 9a
Mississippi · USDA zone 9a, average annual extreme minimum 20°F to 25°F.
Nearest qualified station: BILOXI, MS US (USC00220792), 2.1 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 18 | Earlier date. A last 32°F on or after this day is common. |
| 50% | February 12 | Median. |
| 10% | March 11 | 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 16 | Earlier date. A first 32°F on or before this day is uncommon. |
| 50% | December 14 | Median. |
| 90% | January 11 | 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% | 336 |
| 50% | 301 |
| 90% | 265 |
28°F threshold
| 10% | 50% | 90% | |
|---|---|---|---|
| Last, on or after | February 28 | January 27 | January 2 |
| First, on or before | December 2 | January 2 | January 27 |
| Season at least | 365 days | 335 days | 296 days |
36°F threshold
| 10% | 50% | 90% | |
|---|---|---|---|
| Last, on or after | March 20 | March 1 | February 6 |
| First, on or before | November 6 | November 26 | December 23 |
| Season at least | 302 days | 270 days | 242 days |
Station BILOXI, MS US (USC00220792). Completeness flag S, 29 years used for the 32°F dates. NCEI’s annual probability of at least one day at or below 32°F is 98.8%. Freeze dates are conditional on that threshold occurring. Elevation 3 m. The same probability language applies to the 28°F and 36°F rows when those dates passed the same quality checks.