Jordan climate

Jordan Frost Dates and Growing Season

NOAA 1991-2020 normals for Auburn, 15.8 km from Jordan, elevation 770 ft

Frost and the growing season

NOAA's 1991-2020 freeze probabilities for Auburn. A median date has an even chance of a later freeze in spring, or an earlier one in fall.

The last spring freeze typically comes around May 2 and the first fall freeze around October 18, a growing season of about 166 days.

Median at 36°F
last May 13, first October 5
Median at 32°F
last May 2, first October 18
Median at 28°F
last April 22, first November 1

Last freeze in spring

The chance of a later freeze than the date shown. At 10 percent, one spring in ten still freezes after the date; planting after the 10 percent date for 32°F is the cautious choice.

Threshold10%20%30%40%50%60%70%80%90%
36°FMay 29May 23May 19May 16May 13May 10May 7May 3Apr 30
32°FMay 18May 12May 8May 5May 2Apr 30Apr 27Apr 24Apr 20
28°FMay 7May 2Apr 29Apr 25Apr 22Apr 19Apr 17Apr 12Apr 7
24°FApr 21Apr 18Apr 14Apr 11Apr 8Apr 5Apr 3Apr 1Mar 28
20°FApr 12Apr 7Apr 5Apr 3Apr 1Mar 31Mar 28Mar 23Mar 18
16°FApr 4Apr 1Mar 31Mar 27Mar 24Mar 21Mar 18Mar 15Mar 10

First freeze in fall

The chance of an earlier freeze than the date shown. At 10 percent, one fall in ten freezes before the date.

Threshold10%20%30%40%50%60%70%80%90%
36°FSep 23Sep 27Sep 30Oct 2Oct 5Oct 7Oct 11Oct 15Oct 20
32°FOct 3Oct 7Oct 12Oct 15Oct 18Oct 21Oct 25Oct 29Nov 2
28°FOct 14Oct 21Oct 25Oct 29Nov 1Nov 2Nov 5Nov 9Nov 13
24°FOct 28Nov 1Nov 4Nov 8Nov 10Nov 13Nov 16Nov 19Nov 26
20°FNov 8Nov 12Nov 15Nov 19Nov 22Nov 25Nov 29Dec 2Dec 8
16°FNov 17Nov 22Nov 26Nov 29Dec 1Dec 5Dec 9Dec 14Dec 22

Growing season length

Days between the last spring and first fall freeze at each threshold, with the chance of a season at least that long.

Threshold10%20%30%40%50%60%70%80%90%
36°F163156152148144140137131125
32°F185179174170166161157153146
28°F212204199195192188182177168
24°F236228223220216212208204197
20°F259250244240235232228223217
16°F276268263258254250245240233

How often it gets that cold

The share of years with at least one night at or below each temperature.

36°F or colder
100% of years
32°F or colder
100% of years
28°F or colder
100% of years
24°F or colder
100% of years
20°F or colder
100% of years
16°F or colder
100% of years

Degree days

A degree day is one degree of the daily mean temperature beyond a base, for one day. Heating degree days count cold (the fuel a house burns), cooling degree days heat, growing degree days the warmth a crop needs; each crop has its own base.

Heating degree days, base 65°F
6,892
Cooling degree days, base 65°F
534
Growing degree days, base 40°F
4,538
Growing degree days, base 45°F
3,465
Growing degree days, base 50°F
2,530
Growing degree days, base 55°F
1,728
Growing degree days, base 60°F
1,056

Growing degree days by month, base 50°F

Heating and cooling by month

MonthHeating DDCooling DDGrowing DD 50
January1,29101
February1,12801
March1,01909
April615356
May28029249
June69103485
July13191643
August22150592
September14654363
October4615111
November764019
December1,08701

What this means

NOAA computes these from the daily lows at the station over 1991-2020, fitting the dates of each year's last and first freeze to a distribution, so a date can be stated at any level of risk. 36°F is a frost risk for tender plants on a clear, calm night, since the ground cools below the air above it; 32°F is a freeze; 28°F is a hard freeze that kills most annuals.

The station is 15.8 km from Jordan. Low ground, valleys and open fields freeze earlier and later than a town center or a hillside.

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Sources

NOAA NCEI U.S. Climate Normals, 1991-2020, annual and seasonal normals for station USC00300321 (Auburn). Public domain.