Terry climate

Terry Frost Dates and Growing Season

NOAA 1991-2020 normals for Crystal Spgs Exp Stn, 18.4 km from Terry, elevation 487 ft

Frost and the growing season

NOAA's 1991-2020 freeze probabilities for Crystal Spgs Exp Stn. 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 11 and the first fall freeze around November 16, a growing season of about 250 days.

Median at 36°F
last March 26, first November 6
Median at 32°F
last March 11, first November 16
Median at 28°F
last February 26, first November 28

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 12Apr 6Apr 3Mar 31Mar 26Mar 21Mar 17Mar 12Mar 6
32°FMar 30Mar 24Mar 18Mar 15Mar 11Mar 7Mar 3Feb 28Feb 21
28°FMar 16Mar 11Mar 6Mar 2Feb 26Feb 22Feb 17Feb 10Jan 31
24°FMar 7Mar 1Feb 23Feb 17Feb 12Feb 5Jan 31Jan 27Jan 16
20°FFeb 28Feb 16Feb 8Feb 2Jan 30Jan 25Jan 18Jan 11Dec 31
16°FFeb 12Feb 5Jan 31Jan 27Jan 23Jan 16Jan 11Jan 5Dec 28

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 25Oct 29Nov 1Nov 3Nov 6Nov 8Nov 12Nov 16Nov 22
32°FNov 1Nov 5Nov 9Nov 12Nov 16Nov 20Nov 25Nov 29Dec 6
28°FNov 7Nov 14Nov 20Nov 24Nov 28Dec 2Dec 7Dec 16Dec 27
24°FNov 18Nov 27Dec 4Dec 11Dec 20Dec 26Jan 1Jan 5Jan 15
20°FDec 2Dec 14Dec 25Dec 31Jan 4Jan 9Jan 15Jan 22Feb 2
16°FDec 20Dec 31Jan 3Jan 8Jan 11Jan 17Jan 22Jan 29Feb 6

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°F250240235230225220215209202
32°F279269261255250245239233225
28°F310299291283277271264258248
24°F346332323315309302295286273
20°F365365355347338332325317303
16°F365365365365365361351341327

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
97% of years
20°F or colder
79% of years
16°F or colder
45% 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
2,129
Cooling degree days, base 65°F
2,356
Growing degree days, base 40°F
9,442
Growing degree days, base 45°F
7,749
Growing degree days, base 50°F
6,170
Growing degree days, base 55°F
4,735
Growing degree days, base 60°F
3,459

Growing degree days by month, base 50°F

Heating and cooling by month

MonthHeating DDCooling DDGrowing DD 50
January549390
February3897131
March25030279
April9491451
May13251704
June0429879
July0519984
August0511976
September3355802
October77130521
November28020231
December4758121

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 18.4 km from Terry. 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 USC00222094 (Crystal Spgs Exp Stn). Public domain.