ZIP 57117 Zone 5a
South Dakota · USDA zone 5a, average annual extreme minimum -20°F to -15°F.
Nearest qualified station: SIOUX FALLS, SD US (USW00014944), 4.1 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 18 | Earlier date. A last 32°F on or after this day is common. |
| 50% | May 1 | Median. |
| 10% | May 14 | 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% | September 23 | Earlier date. A first 32°F on or before this day is uncommon. |
| 50% | October 6 | Median. |
| 90% | October 20 | 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% | 176 |
| 50% | 157 |
| 90% | 138 |
28°F threshold
| 10% | 50% | 90% | |
|---|---|---|---|
| Last, on or after | May 5 | April 22 | April 8 |
| First, on or before | October 1 | October 17 | October 30 |
| Season at least | 196 days | 176 days | 154 days |
36°F threshold
| 10% | 50% | 90% | |
|---|---|---|---|
| Last, on or after | May 23 | May 10 | April 29 |
| First, on or before | September 14 | September 27 | October 10 |
| Season at least | 156 days | 139 days | 121 days |
Station SIOUX FALLS, SD US (USW00014944). 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 435.9 m. The same probability language applies to the 28°F and 36°F rows when those dates passed the same quality checks.