Chrisman climate

Chrisman Frost Dates and Growing Season

NOAA 1991-2020 normals for Paris Stp, 20.6 km from Chrisman, elevation 649 ft

Frost and the growing season

NOAA's 1991-2020 freeze probabilities for Paris Stp. 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 21 and the first fall freeze around October 20, a growing season of about 179 days.

Median at 36°F
last May 1, first October 8
Median at 32°F
last April 21, first October 20
Median at 28°F
last April 9, first October 30

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 14May 9May 5May 1Apr 29Apr 26Apr 22Apr 18
32°FMay 9May 1Apr 27Apr 24Apr 21Apr 18Apr 14Apr 11Apr 6
28°FApr 26Apr 21Apr 17Apr 12Apr 9Apr 6Apr 4Apr 1Mar 27
24°FApr 14Apr 7Apr 4Apr 2Mar 31Mar 28Mar 24Mar 19Mar 14
20°FApr 4Mar 31Mar 28Mar 24Mar 20Mar 17Mar 14Mar 9Mar 3
16°FMar 28Mar 21Mar 18Mar 14Mar 11Mar 7Mar 4Feb 28Feb 19

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 3Oct 5Oct 8Oct 11Oct 14Oct 17Oct 22
32°FOct 1Oct 9Oct 14Oct 17Oct 20Oct 22Oct 25Oct 28Nov 1
28°FOct 14Oct 21Oct 24Oct 27Oct 30Nov 1Nov 3Nov 7Nov 12
24°FOct 26Oct 31Nov 1Nov 4Nov 8Nov 11Nov 15Nov 18Nov 24
20°FNov 4Nov 8Nov 12Nov 16Nov 20Nov 23Nov 27Dec 1Dec 6
16°FNov 12Nov 17Nov 22Nov 26Nov 29Dec 1Dec 6Dec 11Dec 18

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°F179171166162159154150144137
32°F199192188184179175170165158
28°F223215210206202198193187179
24°F246238232226221218213208201
20°F269260254249244239234229221
16°F290281275269264259254248239

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
5,853
Cooling degree days, base 65°F
928
Growing degree days, base 40°F
5,607
Growing degree days, base 45°F
4,415
Growing degree days, base 50°F
3,354
Growing degree days, base 55°F
2,412
Growing degree days, base 60°F
1,599

Growing degree days by month, base 50°F

Heating and cooling by month

MonthHeating DDCooling DDGrowing DD 50
January1,23002
February99804
March792138
April4179143
May16070385
June21206634
July3285747
August7235693
September83105475
October35717193
November721137
December1,06504

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 20.6 km from Chrisman. 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 USC00116610 (Paris Stp). Public domain.