ZIP 01608 Zone 6a
Massachusetts · USDA zone 6a, average annual extreme minimum -10°F to -5°F.
Nearest qualified station: WORCESTER RGNL AP, MA US (USW00094746), 3.7 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% | April 11 | Earlier date. A last 32°F on or after this day is common. |
| 50% | April 23 | Median. |
| 10% | May 5 | 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 6 | Earlier date. A first 32°F on or before this day is uncommon. |
| 50% | October 21 | Median. |
| 90% | November 3 | 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% | 198 |
| 50% | 181 |
| 90% | 160 |
28°F threshold
| 10% | 50% | 90% | |
|---|---|---|---|
| Last, on or after | April 22 | April 11 | April 1 |
| First, on or before | October 17 | November 1 | November 15 |
| Season at least | 222 days | 205 days | 185 days |
36°F threshold
| 10% | 50% | 90% | |
|---|---|---|---|
| Last, on or after | May 19 | May 4 | April 23 |
| First, on or before | September 28 | October 9 | October 23 |
| Season at least | 175 days | 158 days | 139 days |
Station WORCESTER RGNL AP, MA US (USW00094746). 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 304.8 m. The same probability language applies to the 28°F and 36°F rows when those dates passed the same quality checks.