Milan climate

Milan Frost Dates and Growing Season

NOAA 1991-2020 normals for Berlin Muni AP, 0.6 km from Milan, elevation 1158 ft

Frost and the growing season

NOAA's 1991-2020 freeze probabilities for Berlin Muni AP. 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 May 30 and the first fall freeze around September 19, a growing season of about 112 days.

Median at 36°F
last June 11, first September 6
Median at 32°F
last May 30, first September 19
Median at 28°F
last May 17, first September 30

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°FJun 30Jun 23Jun 18Jun 14Jun 11Jun 8Jun 5Jun 2May 28
32°FJun 11Jun 7Jun 4Jun 1May 30May 27May 24May 20May 15
28°FJun 1May 26May 23May 19May 17May 14May 11May 7May 1
24°FMay 19May 13May 10May 7May 4May 2Apr 29Apr 26Apr 23
20°FMay 6May 1Apr 28Apr 25Apr 22Apr 20Apr 17Apr 14Apr 9
16°FApr 20Apr 17Apr 14Apr 12Apr 8Apr 7Apr 4Apr 2Mar 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°FAug 25Aug 30Sep 2Sep 4Sep 6Sep 9Sep 12Sep 16Sep 21
32°FSep 5Sep 10Sep 13Sep 16Sep 19Sep 22Sep 24Sep 28Oct 3
28°FSep 17Sep 22Sep 25Sep 28Sep 30Oct 2Oct 4Oct 8Oct 15
24°FSep 28Oct 1Oct 4Oct 7Oct 10Oct 14Oct 18Oct 23Oct 29
20°FOct 6Oct 11Oct 15Oct 19Oct 22Oct 26Oct 30Nov 2Nov 7
16°FOct 17Oct 22Oct 27Oct 31Nov 2Nov 5Nov 8Nov 12Nov 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°F10810195918783797262
32°F13012412011611210910510094
28°F155149144140136132128123117
24°F179172167163158154150146139
20°F203196191186182178173168162
16°F224218213210206202198193187

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
8,755
Cooling degree days, base 65°F
195
Growing degree days, base 40°F
3,397
Growing degree days, base 45°F
2,473
Growing degree days, base 50°F
1,679
Growing degree days, base 55°F
1,019
Growing degree days, base 60°F
516

Growing degree days by month, base 50°F

Heating and cooling by month

MonthHeating DDCooling DDGrowing DD 50
January1,55800
February1,35500
March1,19502
April756019
May4135127
June15635333
July5681490
August8256439
September26717224
October630043
November95004
December1,33800

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 0.6 km from Milan. 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 USW00094700 (Berlin Muni AP). Public domain.