Milan climate

Milan Frost Dates and Growing Season

NOAA 1991-2020 normals for Milan 5 Ne, 8.2 km from Milan, elevation 975 ft

Frost and the growing season

NOAA's 1991-2020 freeze probabilities for Milan 5 Ne. 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 30 and the first fall freeze around October 16, a growing season of about 168 days.

Median at 36°F
last May 8, first October 6
Median at 32°F
last April 30, first October 16
Median at 28°F
last April 17, first October 26

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

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 23Sep 29Oct 1Oct 4Oct 6Oct 8Oct 11Oct 13Oct 18
32°FOct 3Oct 7Oct 10Oct 13Oct 16Oct 18Oct 20Oct 23Oct 29
28°FOct 12Oct 17Oct 21Oct 23Oct 26Oct 28Oct 31Nov 2Nov 6
24°FOct 25Oct 30Nov 1Nov 3Nov 6Nov 10Nov 14Nov 18Nov 25
20°FNov 2Nov 8Nov 13Nov 16Nov 20Nov 24Nov 27Dec 1Dec 7
16°FNov 14Nov 20Nov 24Nov 28Dec 1Dec 4Dec 8Dec 14Dec 20

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°F169163158155151147143137131
32°F188180176172168164161156148
28°F211204199194191186180175168
24°F239230225220217212207201194
20°F266258252246241236230225218
16°F290281276270265259254247240

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
5,679
Cooling degree days, base 65°F
711
Growing degree days, base 40°F
5,365
Growing degree days, base 45°F
4,149
Growing degree days, base 50°F
3,075
Growing degree days, base 55°F
2,138
Growing degree days, base 60°F
1,346

Growing degree days by month, base 50°F

Heating and cooling by month

MonthHeating DDCooling DDGrowing DD 50
January1,14705
February94603
March770133
April4318131
May17448349
June34146562
July4229690
August10186642
September9082444
October37210170
November692041
December1,00906

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 8.2 km from Milan. 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 USC00125658 (Milan 5 Ne). Public domain.