Millington climate

Millington Frost Dates and Growing Season

NOAA 1991-2020 normals for Morris 1 Nw, 25.4 km from Millington, elevation 524 ft

Frost and the growing season

NOAA's 1991-2020 freeze probabilities for Morris 1 Nw. 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 April 20 and the first fall freeze around October 23, a growing season of about 184 days.

Median at 36°F
last April 30, first October 12
Median at 32°F
last April 20, first October 23
Median at 28°F
last April 8, first November 1

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°FMay 18May 12May 7May 4Apr 30Apr 29Apr 25Apr 21Apr 17
32°FMay 6Apr 30Apr 27Apr 23Apr 20Apr 17Apr 14Apr 10Apr 6
28°FApr 24Apr 18Apr 14Apr 11Apr 8Apr 6Apr 3Apr 1Mar 27
24°FApr 13Apr 6Apr 3Apr 1Mar 30Mar 27Mar 23Mar 18Mar 12
20°FApr 2Mar 29Mar 25Mar 21Mar 18Mar 14Mar 11Mar 7Mar 3
16°FMar 26Mar 20Mar 16Mar 13Mar 10Mar 7Mar 3Feb 28Feb 23

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°FSep 27Oct 2Oct 6Oct 9Oct 12Oct 14Oct 17Oct 20Oct 24
32°FOct 9Oct 14Oct 18Oct 20Oct 23Oct 25Oct 28Oct 30Nov 3
28°FOct 21Oct 25Oct 28Oct 30Nov 1Nov 3Nov 6Nov 10Nov 15
24°FNov 1Nov 3Nov 5Nov 8Nov 11Nov 14Nov 17Nov 20Nov 25
20°FNov 6Nov 10Nov 13Nov 17Nov 20Nov 23Nov 27Dec 1Dec 6
16°FNov 11Nov 17Nov 21Nov 25Nov 29Dec 1Dec 5Dec 10Dec 17

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°F183177172168164159155150143
32°F204197193188184180176170163
28°F227220215211208203199194187
24°F247240236231228224220214206
20°F269262256251247242238232226
16°F286277271267262258253248241

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
100% 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
6,141
Cooling degree days, base 65°F
995
Growing degree days, base 40°F
5,546
Growing degree days, base 45°F
4,388
Growing degree days, base 50°F
3,357
Growing degree days, base 55°F
2,445
Growing degree days, base 60°F
1,655

Growing degree days by month, base 50°F

Heating and cooling by month

MonthHeating DDCooling DDGrowing DD 50
January1,28801
February1,05102
March830230
April4518126
May18174370
June25218643
July3312773
August6249708
September82114485
October37117184
November741032
December1,11303

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 25.4 km from Millington. 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 USC00115825 (Morris 1 Nw). Public domain.