ZIP 37406 Zone 8a
Tennessee · USDA zone 8a, average annual extreme minimum 10°F to 15°F.
Nearest qualified station: CHATTANOOGA LOVELL AP, TN US (USW00013882), 3.8 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 6 | Earlier date. A last 32°F on or after this day is common. |
| 50% | March 24 | 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 27 | Earlier date. A first 32°F on or before this day is uncommon. |
| 50% | November 9 | Median. |
| 90% | November 26 | 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% | 254 |
| 50% | 230 |
| 90% | 210 |
28°F threshold
| 10% | 50% | 90% | |
|---|---|---|---|
| Last, on or after | March 30 | March 11 | February 18 |
| First, on or before | November 6 | November 22 | December 13 |
| Season at least | 285 days | 257 days | 233 days |
36°F threshold
| 10% | 50% | 90% | |
|---|---|---|---|
| Last, on or after | April 20 | April 4 | March 19 |
| First, on or before | October 19 | October 31 | November 11 |
| Season at least | 228 days | 208 days | 189 days |
Station CHATTANOOGA LOVELL AP, TN US (USW00013882). 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 204.5 m. The same probability language applies to the 28°F and 36°F rows when those dates passed the same quality checks.