ZIP 50325 Zone 5b
Iowa · USDA zone 5b, average annual extreme minimum -15°F to -10°F.
Nearest qualified station: DES MOINES INTL AP, IA US (USW00014933), 9.3 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 4 | Earlier date. A last 32°F on or after this day is common. |
| 50% | April 18 | Median. |
| 10% | May 2 | 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 20 | 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% | 203 |
| 50% | 184 |
| 90% | 165 |
28°F threshold
| 10% | 50% | 90% | |
|---|---|---|---|
| Last, on or after | April 22 | April 8 | March 25 |
| First, on or before | October 16 | October 30 | November 11 |
| Season at least | 223 days | 203 days | 185 days |
36°F threshold
| 10% | 50% | 90% | |
|---|---|---|---|
| Last, on or after | May 10 | April 29 | April 15 |
| First, on or before | September 25 | October 9 | October 22 |
| Season at least | 182 days | 163 days | 146 days |
Station DES MOINES INTL AP, IA US (USW00014933). 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 291.7 m. The same probability language applies to the 28°F and 36°F rows when those dates passed the same quality checks.