ZIP 66621 Zone 6b
Kansas · USDA zone 6b, average annual extreme minimum -5°F to 0°F.
Nearest qualified station: TOPEKA MUNI AP, KS US (USW00013996), 4.9 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% | March 29 | Earlier date. A last 32°F on or after this day is common. |
| 50% | April 12 | Median. |
| 10% | April 27 | 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 8 | Earlier date. A first 32°F on or before this day is uncommon. |
| 50% | October 23 | Median. |
| 90% | November 4 | 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% | 212 |
| 50% | 191 |
| 90% | 171 |
28°F threshold
| 10% | 50% | 90% | |
|---|---|---|---|
| Last, on or after | April 16 | March 31 | March 15 |
| First, on or before | October 19 | November 1 | November 15 |
| Season at least | 236 days | 212 days | 192 days |
36°F threshold
| 10% | 50% | 90% | |
|---|---|---|---|
| Last, on or after | May 8 | April 25 | April 10 |
| First, on or before | September 30 | October 13 | October 27 |
| Season at least | 189 days | 171 days | 152 days |
Station TOPEKA MUNI AP, KS US (USW00013996). Completeness flag S, 29 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 267 m. The same probability language applies to the 28°F and 36°F rows when those dates passed the same quality checks.