Hoopeston climate

Hoopeston Frost Dates and Growing Season

NOAA 1991-2020 normals for Hoopeston, 1.4 km from Hoopeston, elevation 710 ft

Frost and the growing season

NOAA's 1991-2020 freeze probabilities for Hoopeston. 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 22 and the first fall freeze around October 19, a growing season of about 180 days.

Median at 36°F
last May 2, first October 9
Median at 32°F
last April 22, first October 19
Median at 28°F
last April 10, first October 31

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 19May 13May 9May 5May 2Apr 30Apr 26Apr 23Apr 18
32°FMay 8May 2Apr 29Apr 25Apr 22Apr 19Apr 16Apr 12Apr 7
28°FApr 26Apr 21Apr 17Apr 14Apr 10Apr 8Apr 5Apr 2Mar 28
24°FApr 16Apr 10Apr 5Apr 3Apr 1Mar 29Mar 25Mar 20Mar 14
20°FApr 6Apr 1Mar 29Mar 24Mar 21Mar 17Mar 14Mar 9Mar 4
16°FMar 31Mar 23Mar 19Mar 15Mar 11Mar 8Mar 4Feb 28Feb 21

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 24Sep 29Oct 2Oct 5Oct 9Oct 12Oct 14Oct 18Oct 23
32°FOct 5Oct 11Oct 14Oct 17Oct 19Oct 22Oct 25Oct 28Nov 1
28°FOct 16Oct 22Oct 26Oct 29Oct 31Nov 2Nov 6Nov 9Nov 13
24°FOct 29Nov 1Nov 4Nov 7Nov 10Nov 13Nov 16Nov 20Nov 26
20°FNov 5Nov 9Nov 13Nov 17Nov 20Nov 23Nov 28Dec 1Dec 8
16°FNov 12Nov 17Nov 22Nov 26Nov 30Dec 3Dec 6Dec 12Dec 20

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°F177171166162158154149144136
32°F199192188184180176171165157
28°F222216211206201197193188180
24°F247238233229224220216211204
20°F270261255250245241235230221
16°F290282274269264258254247238

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
5,645
Cooling degree days, base 65°F
1,035
Growing degree days, base 40°F
5,837
Growing degree days, base 45°F
4,625
Growing degree days, base 50°F
3,539
Growing degree days, base 55°F
2,574
Growing degree days, base 60°F
1,735

Growing degree days by month, base 50°F

Heating and cooling by month

MonthHeating DDCooling DDGrowing DD 50
January1,21202
February98004
March757244
April38412160
May13889422
June16232666
July2301764
August6252711
September69126508
October33121210
November697142
December1,05405

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 1.4 km from Hoopeston. 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 USC00114198 (Hoopeston). Public domain.