Lisman climate

Lisman Frost Dates and Growing Season

NOAA 1991-2020 normals for P Harrison Archusa, 43 km from Lisman, elevation 216 ft

Frost and the growing season

NOAA's 1991-2020 freeze probabilities for P Harrison Archusa. 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 March 14 and the first fall freeze around November 16, a growing season of about 247 days.

Median at 36°F
last March 29, first November 3
Median at 32°F
last March 14, first November 16
Median at 28°F
last February 28, first November 29

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

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°FOct 22Oct 26Oct 30Nov 1Nov 3Nov 6Nov 9Nov 14Nov 21
32°FOct 31Nov 5Nov 8Nov 12Nov 16Nov 20Nov 25Nov 29Dec 3
28°FNov 10Nov 16Nov 20Nov 25Nov 29Dec 2Dec 5Dec 12Dec 26
24°FNov 22Nov 30Dec 3Dec 6Dec 12Dec 21Dec 29Jan 4Jan 16
20°FDec 4Dec 10Dec 20Dec 28Jan 1Jan 6Jan 12Jan 21Feb 3
16°FDec 13Dec 23Dec 30Jan 2Jan 7Jan 12Jan 17Jan 23Feb 1

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°F246238231226221216212207199
32°F277266258251247242236230221
28°F306294286280274267261255247
24°F341330320310304297289281269
20°F365365352342335330322311299
16°F365365365365365358348338328

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
98% of years
20°F or colder
82% of years
16°F or colder
46% 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
2,302
Cooling degree days, base 65°F
2,340
Growing degree days, base 40°F
9,261
Growing degree days, base 45°F
7,587
Growing degree days, base 50°F
6,042
Growing degree days, base 55°F
4,644
Growing degree days, base 60°F
3,407

Growing degree days by month, base 50°F

Heating and cooling by month

MonthHeating DDCooling DDGrowing DD 50
January578479
February4018124
March25629269
April9580438
May14260711
June0441891
July0532997
August0505970
September2351799
October99113483
November33213178
December5266103

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 43 km from Lisman. 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 USC00226638 (P Harrison Archusa). Public domain.