Stacy climate

Stacy Frost Dates and Growing Season

NOAA 1991-2020 normals for Forest Lake 5NE, 10.1 km from Stacy, elevation 905 ft

Frost and the growing season

NOAA's 1991-2020 freeze probabilities for Forest Lake 5NE. 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 3 and the first fall freeze around October 5, a growing season of about 154 days.

Median at 36°F
last May 14, first September 28
Median at 32°F
last May 3, first October 5
Median at 28°F
last April 24, first October 17

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 27May 23May 19May 16May 14May 11May 8May 4Apr 30
32°FMay 19May 13May 9May 6May 3May 1Apr 29Apr 25Apr 20
28°FMay 6May 2Apr 29Apr 26Apr 24Apr 21Apr 18Apr 14Apr 10
24°FApr 28Apr 24Apr 21Apr 18Apr 15Apr 12Apr 8Apr 5Apr 2
20°FApr 20Apr 15Apr 11Apr 9Apr 6Apr 3Apr 1Mar 30Mar 23
16°FApr 12Apr 7Apr 4Apr 2Mar 31Mar 28Mar 24Mar 19Mar 13

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 15Sep 19Sep 23Sep 25Sep 28Sep 30Oct 2Oct 6Oct 10
32°FSep 22Sep 27Sep 30Oct 3Oct 5Oct 8Oct 12Oct 16Oct 20
28°FOct 1Oct 5Oct 9Oct 14Oct 17Oct 20Oct 23Oct 27Nov 1
24°FOct 12Oct 18Oct 22Oct 26Oct 29Nov 1Nov 4Nov 7Nov 12
20°FOct 23Oct 28Nov 1Nov 3Nov 5Nov 9Nov 12Nov 15Nov 20
16°FOct 31Nov 3Nov 6Nov 10Nov 12Nov 15Nov 18Nov 22Nov 27

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°F154148143140136132128123116
32°F174167162157154150146140132
28°F194188183179174170165160153
24°F215209204200196192188182175
20°F234226220216212208204200194
16°F249242237232228223219214208

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
7,917
Cooling degree days, base 65°F
612
Growing degree days, base 40°F
4,547
Growing degree days, base 45°F
3,530
Growing degree days, base 50°F
2,620
Growing degree days, base 55°F
1,825
Growing degree days, base 60°F
1,152

Growing degree days by month, base 50°F

Heating and cooling by month

MonthHeating DDCooling DDGrowing DD 50
January1,59300
February1,31000
March1,05606
April599259
May25829264
June51127527
July9220676
August19171617
September15459365
October516598
November95109
December1,40100

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 10.1 km from Stacy. 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 USC00212881 (Forest Lake 5NE). Public domain.