ZIP 06459 Zone 6b
Connecticut · USDA zone 6b, average annual extreme minimum -5°F to 0°F.
Nearest qualified station: MERIDEN MARKHAM MUNI AP, CT US (USW00054788), 9 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 26 | Median. |
| 10% | May 9 | 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 4 | Earlier date. A first 32°F on or before this day is uncommon. |
| 50% | October 16 | Median. |
| 90% | November 1 | 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% | 194 |
| 50% | 175 |
| 90% | 156 |
28°F threshold
| 10% | 50% | 90% | |
|---|---|---|---|
| Last, on or after | April 28 | April 10 | March 30 |
| First, on or before | October 14 | October 30 | November 12 |
| Season at least | 218 days | 198 days | 179 days |
36°F threshold
| 10% | 50% | 90% | |
|---|---|---|---|
| Last, on or after | May 21 | May 7 | April 24 |
| First, on or before | September 26 | October 6 | October 19 |
| Season at least | 171 days | 152 days | 134 days |
Station MERIDEN MARKHAM MUNI AP, CT US (USW00054788). Completeness flag R, 19 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 31.4 m. The same probability language applies to the 28°F and 36°F rows when those dates passed the same quality checks.