Nolanville climate

Nolanville Frost Dates and Growing Season

NOAA 1991-2020 normals for Killeen, 8.3 km from Nolanville, elevation 815 ft

Frost and the growing season

NOAA's 1991-2020 freeze probabilities for Killeen. 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 17, a growing season of about 247 days.

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

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°F249240234228223218212205196
32°F276266259253247241235228217
28°F305293285279271264257249240
24°F343330320310304297289280266
20°F365365357347341334325313299
16°F365365365365365365365351335

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
74% of years
16°F or colder
30% 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
2,072
Cooling degree days, base 65°F
2,683
Growing degree days, base 40°F
9,816
Growing degree days, base 45°F
8,115
Growing degree days, base 50°F
6,526
Growing degree days, base 55°F
5,085
Growing degree days, base 60°F
3,800

Growing degree days by month, base 50°F

Heating and cooling by month

MonthHeating DDCooling DDGrowing DD 50
January536386
February3879128
March23633295
April8089461
May12273725
June0478928
July05891,054
August06091,074
September5400844
October66161564
November25735269
December492498

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 8.3 km from Nolanville. 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 USC00414792 (Killeen). Public domain.