Milo climate

Milo Frost Dates and Growing Season

NOAA 1991-2020 normals for Indianola 2W, 19.1 km from Milo, elevation 924 ft

Frost and the growing season

NOAA's 1991-2020 freeze probabilities for Indianola 2W. 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 24 and the first fall freeze around October 12, a growing season of about 168 days.

Median at 36°F
last May 4, first October 2
Median at 32°F
last April 24, first October 12
Median at 28°F
last April 14, first October 21

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 19May 13May 9May 6May 4May 2Apr 30Apr 25Apr 20
32°FMay 8May 4May 1Apr 28Apr 24Apr 21Apr 18Apr 15Apr 11
28°FApr 29Apr 23Apr 20Apr 17Apr 14Apr 12Apr 8Apr 5Apr 1
24°FApr 20Apr 14Apr 10Apr 7Apr 4Apr 1Mar 30Mar 25Mar 19
20°FApr 11Apr 5Apr 1Mar 30Mar 26Mar 22Mar 18Mar 13Mar 9
16°FApr 1Mar 28Mar 23Mar 19Mar 15Mar 13Mar 9Mar 5Feb 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°FSep 19Sep 23Sep 27Sep 30Oct 2Oct 5Oct 7Oct 11Oct 15
32°FSep 27Oct 1Oct 6Oct 9Oct 12Oct 14Oct 18Oct 21Oct 26
28°FOct 6Oct 12Oct 16Oct 19Oct 21Oct 24Oct 27Oct 30Nov 4
24°FOct 18Oct 23Oct 26Oct 29Nov 1Nov 2Nov 5Nov 9Nov 14
20°FOct 28Nov 1Nov 3Nov 6Nov 9Nov 12Nov 16Nov 20Nov 27
16°FNov 4Nov 8Nov 11Nov 14Nov 18Nov 21Nov 25Nov 29Dec 4

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°F168161156153149144141135128
32°F188181176171168164159155147
28°F209201196192188184180175169
24°F230222217213208204199195188
20°F252244239234230225220214207
16°F271264257252248244240234226

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
6,417
Cooling degree days, base 65°F
934
Growing degree days, base 40°F
5,421
Growing degree days, base 45°F
4,274
Growing degree days, base 50°F
3,252
Growing degree days, base 55°F
2,352
Growing degree days, base 60°F
1,578

Growing degree days by month, base 50°F

Heating and cooling by month

MonthHeating DDCooling DDGrowing DD 50
January1,34400
February1,09902
March830234
April4588121
May18356350
June24194621
July3305767
August7249707
September106105454
October40415168
November788027
December1,17301

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 19.1 km from Milo. 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 USC00134063 (Indianola 2W). Public domain.