ZIP 52242 Zone 5b
Iowa · USDA zone 5b, average annual extreme minimum -15°F to -10°F.
Nearest qualified station: IOWA CITY MUNI AP, IA US (USW00014937), 2.1 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 5 | Earlier date. A last 32°F on or after this day is common. |
| 50% | April 21 | Median. |
| 10% | May 6 | 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 18 | Median. |
| 90% | October 31 | 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% | 201 |
| 50% | 180 |
| 90% | 159 |
28°F threshold
| 10% | 50% | 90% | |
|---|---|---|---|
| Last, on or after | April 27 | April 9 | March 25 |
| First, on or before | October 15 | October 28 | November 9 |
| Season at least | 221 days | 202 days | 180 days |
36°F threshold
| 10% | 50% | 90% | |
|---|---|---|---|
| Last, on or after | May 15 | May 1 | April 17 |
| First, on or before | September 26 | October 9 | October 21 |
| Season at least | 178 days | 161 days | 141 days |
Station IOWA CITY MUNI AP, IA US (USW00014937). Completeness flag R, 23 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 198.1 m. The same probability language applies to the 28°F and 36°F rows when those dates passed the same quality checks.