Amory climate

Amory Frost Dates and Growing Season

NOAA 1991-2020 normals for Aberdeen, 17.4 km from Amory, elevation 198 ft

Frost and the growing season

NOAA's 1991-2020 freeze probabilities for Aberdeen. 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 29 and the first fall freeze around November 5, a growing season of about 223 days.

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

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 16Oct 21Oct 23Oct 26Oct 28Oct 31Nov 2Nov 5Nov 10
32°FOct 24Oct 28Nov 1Nov 2Nov 5Nov 8Nov 11Nov 15Nov 20
28°FNov 1Nov 5Nov 8Nov 12Nov 15Nov 19Nov 24Nov 29Dec 3
24°FNov 10Nov 15Nov 21Nov 26Dec 1Dec 3Dec 8Dec 16Dec 27
20°FNov 24Dec 1Dec 7Dec 13Dec 21Dec 27Jan 1Jan 5Jan 15
16°FDec 8Dec 19Dec 27Jan 1Jan 3Jan 8Jan 13Jan 19Feb 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°F222215210205201197192186179
32°F248240233227223218213208200
28°F275266259253248243238230222
24°F309298289282276270264259249
20°F346334327319311304298290276
16°F365365355346339334327319306

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
97% of years
16°F or colder
80% 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
3,101
Cooling degree days, base 65°F
1,803
Growing degree days, base 40°F
8,062
Growing degree days, base 45°F
6,498
Growing degree days, base 50°F
5,086
Growing degree days, base 55°F
3,829
Growing degree days, base 60°F
2,733

Growing degree days by month, base 50°F

Heating and cooling by month

MonthHeating DDCooling DDGrowing DD 50
January729037
February559149
March3778167
April16641336
May33165597
June0344793
July0459924
August0439904
September10271711
October14268399
November4257125
December660145

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 17.4 km from Amory. 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 USC00220021 (Aberdeen). Public domain.