ZIP 20110 Zone 7a
Virginia · USDA zone 7a, average annual extreme minimum 0°F to 5°F.
Nearest qualified station: WASHINGTON DC DULLES AP, VA US (USW00093738), 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 31 | Earlier date. A last 32°F on or after this day is common. |
| 50% | April 15 | Median. |
| 10% | April 30 | 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 10 | Earlier date. A first 32°F on or before this day is uncommon. |
| 50% | October 24 | Median. |
| 90% | November 5 | 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% | 214 |
| 50% | 194 |
| 90% | 170 |
28°F threshold
| 10% | 50% | 90% | |
|---|---|---|---|
| Last, on or after | April 16 | April 1 | March 18 |
| First, on or before | October 21 | November 4 | November 19 |
| Season at least | 240 days | 218 days | 197 days |
36°F threshold
| 10% | 50% | 90% | |
|---|---|---|---|
| Last, on or after | May 17 | April 29 | April 12 |
| First, on or before | October 2 | October 14 | October 27 |
| Season at least | 189 days | 170 days | 148 days |
Station WASHINGTON DC DULLES AP, VA US (USW00093738). Completeness flag S, 26 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 88.4 m. The same probability language applies to the 28°F and 36°F rows when those dates passed the same quality checks.