Orland Park climate

Orland Park Frost Dates and Growing Season

NOAA 1991-2020 normals for Little Red School Hse, 9 km from Orland Park, elevation 715 ft

Frost and the growing season

NOAA's 1991-2020 freeze probabilities for Little Red School Hse. 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 April 19 and the first fall freeze around October 22, a growing season of about 183 days.

Median at 36°F
last April 30, first October 12
Median at 32°F
last April 19, first October 22
Median at 28°F
last April 7, 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 18May 11May 6May 3Apr 30Apr 28Apr 25Apr 21Apr 16
32°FMay 5Apr 30Apr 25Apr 21Apr 19Apr 16Apr 13Apr 10Apr 6
28°FApr 22Apr 17Apr 13Apr 9Apr 7Apr 4Apr 2Mar 31Mar 26
24°FApr 10Apr 5Apr 2Mar 31Mar 29Mar 26Mar 22Mar 19Mar 13
20°FApr 1Mar 29Mar 26Mar 22Mar 19Mar 16Mar 13Mar 9Mar 5
16°FMar 25Mar 20Mar 17Mar 14Mar 11Mar 8Mar 5Mar 2Feb 23

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 28Oct 3Oct 7Oct 9Oct 12Oct 14Oct 17Oct 20Oct 24
32°FOct 8Oct 14Oct 17Oct 19Oct 22Oct 24Oct 26Oct 29Nov 3
28°FOct 19Oct 24Oct 27Oct 30Nov 1Nov 3Nov 6Nov 10Nov 16
24°FOct 31Nov 3Nov 6Nov 9Nov 12Nov 15Nov 18Nov 22Nov 27
20°FNov 7Nov 11Nov 15Nov 18Nov 22Nov 24Nov 28Dec 2Dec 8
16°FNov 14Nov 19Nov 23Nov 27Nov 30Dec 2Dec 7Dec 13Dec 19

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°F181175170166163159154149141
32°F203197192187183179175169163
28°F227219214210206203198193185
24°F249242237233228225220215208
20°F270263258253249245241235228
16°F289281275270265261256251244

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
6,041
Cooling degree days, base 65°F
1,120
Growing degree days, base 40°F
5,716
Growing degree days, base 45°F
4,553
Growing degree days, base 50°F
3,512
Growing degree days, base 55°F
2,592
Growing degree days, base 60°F
1,800

Growing degree days by month, base 50°F

Heating and cooling by month

MonthHeating DDCooling DDGrowing DD 50
January1,27400
February1,05702
March831231
April4397118
May17262366
June19227658
July0366830
August2313776
September58129522
October35913180
November736128
December1,09603

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 9 km from Orland Park. Low ground, valleys and open fields freeze earlier and later than a town center or a hillside.

More

Sources

NOAA NCEI U.S. Climate Normals, 1991-2020, annual and seasonal normals for station USC00115110 (Little Red School Hse). Public domain.