Starbrick climate

Starbrick Frost Dates and Growing Season

NOAA 1991-2020 normals for Warren, 4.7 km from Starbrick, elevation 1210 ft

Frost and the growing season

NOAA's 1991-2020 freeze probabilities for Warren. 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 4 and the first fall freeze around October 21, a growing season of about 168 days.

Median at 36°F
last May 15, first October 8
Median at 32°F
last May 4, first October 21
Median at 28°F
last April 23, first November 2

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 31May 26May 22May 19May 15May 11May 8May 5Apr 30
32°FMay 22May 16May 11May 7May 4Apr 30Apr 28Apr 24Apr 20
28°FMay 11May 4Apr 30Apr 26Apr 23Apr 20Apr 17Apr 14Apr 8
24°FApr 23Apr 18Apr 15Apr 12Apr 9Apr 6Apr 3Apr 1Mar 28
20°FApr 11Apr 5Apr 3Apr 1Mar 30Mar 27Mar 24Mar 20Mar 16
16°FApr 1Mar 29Mar 26Mar 23Mar 20Mar 17Mar 15Mar 11Mar 6

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 28Oct 1Oct 3Oct 5Oct 8Oct 10Oct 13Oct 17Oct 22
32°FOct 6Oct 11Oct 14Oct 18Oct 21Oct 24Oct 27Oct 31Nov 4
28°FOct 18Oct 24Oct 28Oct 31Nov 2Nov 5Nov 8Nov 12Nov 17
24°FOct 29Nov 3Nov 7Nov 11Nov 14Nov 17Nov 20Nov 26Dec 1
20°FNov 6Nov 13Nov 17Nov 21Nov 26Dec 1Dec 3Dec 7Dec 15
16°FNov 16Nov 23Nov 30Dec 3Dec 7Dec 11Dec 15Dec 20Dec 28

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°F165159154149145142137131124
32°F188182176172168165160155147
28°F215207202196192187183177168
24°F241233228222218214209203194
20°F266259253248243239234227219
16°F286278272267262257253246238

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
6,581
Cooling degree days, base 65°F
513
Growing degree days, base 40°F
4,645
Growing degree days, base 45°F
3,535
Growing degree days, base 50°F
2,568
Growing degree days, base 55°F
1,736
Growing degree days, base 60°F
1,043

Growing degree days by month, base 50°F

Heating and cooling by month

MonthHeating DDCooling DDGrowing DD 50
January1,23401
February1,07901
March953014
April563372
May26532263
June6997479
July16171620
August21146591
September12457386
October4446119
November752020
December1,06203

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 4.7 km from Starbrick. 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 USC00369298 (Warren). Public domain.