Jordan climate

Jordan Frost Dates and Growing Season

NOAA 1991-2020 normals for Jordan, 0.7 km from Jordan, elevation 2620 ft

Frost and the growing season

NOAA's 1991-2020 freeze probabilities for Jordan. 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 21 and the first fall freeze around September 18, a growing season of about 118 days.

Median at 36°F
last May 30, first September 8
Median at 32°F
last May 21, first September 18
Median at 28°F
last May 9, first September 26

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°FJun 16Jun 9Jun 5Jun 1May 30May 28May 25May 22May 18
32°FJun 2May 29May 26May 23May 21May 18May 16May 12May 8
28°FMay 23May 18May 15May 12May 9May 7May 3May 1Apr 26
24°FMay 12May 7May 3May 1Apr 29Apr 26Apr 23Apr 19Apr 14
20°FMay 2Apr 28Apr 24Apr 20Apr 16Apr 13Apr 10Apr 6Apr 1
16°FApr 24Apr 17Apr 12Apr 8Apr 5Apr 2Mar 31Mar 25Mar 16

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°FAug 26Aug 31Sep 3Sep 5Sep 8Sep 11Sep 13Sep 16Sep 21
32°FSep 4Sep 9Sep 13Sep 16Sep 18Sep 20Sep 23Sep 26Oct 1
28°FSep 13Sep 18Sep 22Sep 24Sep 26Sep 29Oct 1Oct 4Oct 9
24°FSep 21Sep 26Sep 30Oct 2Oct 5Oct 8Oct 12Oct 15Oct 20
20°FSep 29Oct 5Oct 8Oct 13Oct 15Oct 18Oct 22Oct 27Nov 1
16°FOct 7Oct 14Oct 18Oct 23Oct 26Oct 29Nov 1Nov 5Nov 11

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°F1161101061029995928778
32°F135130126122118115111107100
28°F156150145142138134131125119
24°F178171166162157154150145139
20°F204196191186182176171165157
16°F227218212207203198193187176

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
8,253
Cooling degree days, base 65°F
486
Growing degree days, base 40°F
3,952
Growing degree days, base 45°F
2,983
Growing degree days, base 50°F
2,158
Growing degree days, base 55°F
1,466
Growing degree days, base 60°F
907

Growing degree days by month, base 50°F

Heating and cooling by month

MonthHeating DDCooling DDGrowing DD 50
January1,48000
February1,23600
March1,02003
April653031
May3799165
June11861397
July22206649
August45180601
September25129257
October640152
November1,02603
December1,38200

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 0.7 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 USC00244522 (Jordan). Public domain.