ZIP 85282 Zone 10a

Arizona · USDA zone 10a, average annual extreme minimum 30°F to 35°F.

Nearest qualified station: TEMPE ASU, AZ US (USC00028499), 2.3 miles from the Census ZCTA internal point for this ZIP.

Median last 32°F is February 13. Median first 32°F is December 5. The 50% growing-season length is 298 days. The green band runs from the median last frost to the median first frost. Thin ticks mark the 10%, 50%, and 90% dates.

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.

ProbabilityDateHow to read it
90%January 12Earlier date. A last 32°F on or after this day is common.
50%February 13Median.
10%March 9Later 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.

ProbabilityDateHow to read it
10%November 18Earlier date. A first 32°F on or before this day is uncommon.
50%December 5Median.
90%December 24Later 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 longDays
10%331
50%298
90%266

28°F threshold

10%50%90%
Last, on or afterFebruary 19January 16December 19
First, on or beforeNovember 27December 19January 19
Season at least365 days337 days299 days

36°F threshold

10%50%90%
Last, on or afterApril 7March 8February 14
First, on or beforeNovember 7November 26December 9
Season at least287 days259 days226 days

Station TEMPE ASU, AZ US (USC00028499). Completeness flag R, 24 years used for the 32°F dates. NCEI’s annual probability of at least one day at or below 32°F is 99.7%. Freeze dates are conditional on that threshold occurring. Elevation 355.7 m. The same probability language applies to the 28°F and 36°F rows when those dates passed the same quality checks.

Methodology · Arizona cities