ZIP 28078 Zone 8a
North Carolina · USDA zone 8a, average annual extreme minimum 10°F to 15°F.
Nearest qualified station: CHARLOTTE DOUGLAS AP, NC US (USW00013881), 13.5 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% | March 12 | Earlier date. A last 32°F on or after this day is common. |
| 50% | March 30 | Median. |
| 10% | April 14 | 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 22 | Earlier date. A first 32°F on or before this day is uncommon. |
| 50% | November 3 | 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% | 244 |
| 50% | 221 |
| 90% | 201 |
28°F threshold
| 10% | 50% | 90% | |
|---|---|---|---|
| Last, on or after | April 3 | March 17 | February 25 |
| First, on or before | November 1 | November 14 | December 2 |
| Season at least | 271 days | 245 days | 221 days |
36°F threshold
| 10% | 50% | 90% | |
|---|---|---|---|
| Last, on or after | April 28 | April 11 | March 26 |
| First, on or before | October 15 | October 27 | November 7 |
| Season at least | 220 days | 200 days | 179 days |
Station CHARLOTTE DOUGLAS AP, NC US (USW00013881). 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 221.9 m. The same probability language applies to the 28°F and 36°F rows when those dates passed the same quality checks.