Thrall climate

Thrall Frost Dates and Growing Season

NOAA 1991-2020 normals for Taylor 1NW, 11.4 km from Thrall, elevation 571 ft

Frost and the growing season

NOAA's 1991-2020 freeze probabilities for Taylor 1NW. 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 8 and the first fall freeze around November 21, a growing season of about 257 days.

Median at 36°F
last March 21, first November 9
Median at 32°F
last March 8, first November 21
Median at 28°F
last February 24, first December 4

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 10Apr 4Mar 31Mar 26Mar 21Mar 16Mar 12Mar 7Mar 1
32°FMar 30Mar 21Mar 16Mar 11Mar 8Mar 4Mar 1Feb 24Feb 14
28°FMar 15Mar 9Mar 4Mar 1Feb 24Feb 18Feb 10Feb 1Jan 22
24°FMar 7Feb 28Feb 19Feb 11Feb 2Jan 29Jan 20Jan 9Dec 28
20°FFeb 24Feb 10Jan 31Jan 25Jan 19Jan 12Jan 5Dec 31Dec 21
16°FFeb 1Jan 22Jan 15Jan 10Jan 7Jan 4Jan 1Dec 29Dec 20

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 31Nov 3Nov 6Nov 9Nov 13Nov 17Nov 22Nov 30
32°FNov 2Nov 8Nov 13Nov 17Nov 21Nov 27Dec 1Dec 5Dec 12
28°FNov 12Nov 19Nov 24Dec 1Dec 4Dec 9Dec 16Dec 24Jan 2
24°FNov 25Dec 2Dec 8Dec 17Dec 24Jan 1Jan 6Jan 15Feb 1
20°FDec 8Dec 20Dec 27Jan 1Jan 4Jan 9Jan 17Jan 29Feb 11
16°FDec 20Dec 26Jan 1Jan 2Jan 5Jan 7Jan 11Jan 18Feb 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°F261251245239233227222216208
32°F286276269262257252246240229
28°F326311303294286278269261253
24°F365353342335327319309301288
20°F365365365365365361351340323
16°F365365365365365365365365363

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
99% of years
24°F or colder
89% of years
20°F or colder
50% of years
16°F or colder
14% 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
1,902
Cooling degree days, base 65°F
2,804
Growing degree days, base 40°F
10,090
Growing degree days, base 45°F
8,373
Growing degree days, base 50°F
6,763
Growing degree days, base 55°F
5,288
Growing degree days, base 60°F
3,966

Growing degree days by month, base 50°F

Heating and cooling by month

MonthHeating DDCooling DDGrowing DD 50
January5016104
February36213152
March20943323
April70115498
May8298755
June0489939
July05951,060
August06091,074
September1409858
October54176589
November23840286
December45910126

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 11.4 km from Thrall. Low ground, valleys and open fields freeze earlier and later than a town center or a hillside.

More

Sources

NOAA NCEI U.S. Climate Normals, 1991-2020, annual and seasonal normals for station USC00418862 (Taylor 1NW). Public domain.