Grapeland climate

Grapeland Frost Dates and Growing Season

NOAA 1991-2020 normals for Crockett, 20.7 km from Grapeland, elevation 347 ft

Frost and the growing season

NOAA's 1991-2020 freeze probabilities for Crockett. 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 13 and the first fall freeze around November 17, a growing season of about 251 days.

Median at 36°F
last March 29, first November 6
Median at 32°F
last March 13, first November 17
Median at 28°F
last February 24, first November 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°FApr 16Apr 8Apr 5Apr 1Mar 29Mar 24Mar 19Mar 14Mar 5
32°FApr 2Mar 27Mar 22Mar 17Mar 13Mar 8Mar 3Feb 27Feb 18
28°FMar 17Mar 11Mar 5Mar 1Feb 24Feb 17Feb 9Feb 2Jan 27
24°FMar 7Feb 28Feb 16Feb 8Feb 1Jan 28Jan 24Jan 16Jan 3
20°FFeb 24Feb 7Jan 31Jan 25Jan 18Jan 11Jan 5Dec 31Dec 21
16°FFeb 8Feb 1Jan 23Jan 16Jan 10Jan 6Jan 2Dec 30Dec 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°FOct 26Oct 30Nov 1Nov 4Nov 6Nov 10Nov 14Nov 19Nov 25
32°FNov 1Nov 6Nov 10Nov 14Nov 17Nov 22Nov 27Dec 1Dec 6
28°FNov 8Nov 15Nov 20Nov 26Nov 30Dec 3Dec 7Dec 15Dec 28
24°FNov 22Nov 29Dec 4Dec 10Dec 18Dec 26Jan 2Jan 8Jan 18
20°FDec 2Dec 12Dec 21Dec 30Jan 2Jan 6Jan 10Jan 19Feb 1
16°FDec 13Dec 25Jan 1Jan 2Jan 5Jan 8Jan 13Jan 23Feb 2

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°F254243236230225219215209202
32°F280271263256251246240232223
28°F318304296287280274268260251
24°F354342333326319309301292279
20°F365365365362354347338330316
16°F365365365365365365365364352

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
94% of years
20°F or colder
62% of years
16°F or colder
22% 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
2,104
Cooling degree days, base 65°F
2,583
Growing degree days, base 40°F
9,678
Growing degree days, base 45°F
7,985
Growing degree days, base 50°F
6,411
Growing degree days, base 55°F
4,978
Growing degree days, base 60°F
3,698

Growing degree days by month, base 50°F

Heating and cooling by month

MonthHeating DDCooling DDGrowing DD 50
January547586
February3838131
March24233287
April8796462
May10270725
June0457907
July05611,026
August05701,035
September3388835
October70154551
November27532251
December4889114

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 20.7 km from Grapeland. 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 USC00412114 (Crockett). Public domain.