Baylor County climate

Baylor County Frost Dates and Growing Season

NOAA 1991-2020 normals for Seymour 3NW, 7.6 km from Baylor County, elevation 1311 ft

Frost and the growing season

NOAA's 1991-2020 freeze probabilities for Seymour 3NW. 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 30 and the first fall freeze around November 6, a growing season of about 222 days.

Median at 36°F
last April 9, first October 29
Median at 32°F
last March 30, first November 6
Median at 28°F
last March 12, first November 15

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

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°F224218212207202197193187180
32°F247239233227222217213206198
28°F269261256251246242236229220
24°F296287280275269264259252244
20°F329318309303297292285278266
16°F365353343335327319310303291

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
90% 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
3,040
Cooling degree days, base 65°F
2,384
Growing degree days, base 40°F
8,715
Growing degree days, base 45°F
7,149
Growing degree days, base 50°F
5,735
Growing degree days, base 55°F
4,472
Growing degree days, base 60°F
3,357

Growing degree days by month, base 50°F

Heating and cooling by month

MonthHeating DDCooling DDGrowing DD 50
January721025
February548254
March36216195
April14466384
May29222659
June1460909
July06111,075
August05781,043
September11320759
October11798457
November41711144
December691031

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 7.6 km from Baylor County. 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 USC00418221 (Seymour 3NW). Public domain.