Roscoe climate

Roscoe Frost Dates and Growing Season

NOAA 1991-2020 normals for Callicoon Ctr, 12.1 km from Roscoe, elevation 1221 ft

Frost and the growing season

NOAA's 1991-2020 freeze probabilities for Callicoon Ctr. 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 12 and the first fall freeze around October 7, a growing season of about 146 days.

Median at 36°F
last May 24, first September 27
Median at 32°F
last May 12, first October 7
Median at 28°F
last April 29, first October 20

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 5Jun 1May 29May 27May 24May 21May 18May 14May 8
32°FMay 28May 23May 19May 16May 12May 8May 4Apr 30Apr 25
28°FMay 17May 11May 6May 2Apr 29Apr 24Apr 20Apr 16Apr 10
24°FMay 2Apr 24Apr 19Apr 15Apr 11Apr 8Apr 5Apr 3Mar 31
20°FApr 12Apr 8Apr 5Apr 3Apr 2Mar 31Mar 29Mar 25Mar 20
16°FApr 4Apr 1Mar 30Mar 28Mar 25Mar 22Mar 20Mar 17Mar 12

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 13Sep 19Sep 22Sep 24Sep 27Sep 29Oct 1Oct 4Oct 8
32°FSep 25Sep 30Oct 1Oct 4Oct 7Oct 8Oct 11Oct 14Oct 19
28°FOct 5Oct 9Oct 13Oct 17Oct 20Oct 22Oct 25Oct 29Nov 1
24°FOct 18Oct 24Oct 27Oct 31Nov 1Nov 4Nov 7Nov 10Nov 15
20°FOct 29Nov 2Nov 6Nov 9Nov 12Nov 15Nov 18Nov 22Nov 27
16°FNov 9Nov 13Nov 17Nov 20Nov 23Nov 26Nov 29Dec 1Dec 7

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°F145138132128125121116112105
32°F167160155150146142137133126
28°F195188182177173168163157149
24°F221215211207202198193187179
20°F244236232227224220216212206
16°F265257251246243238234230224

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
7,387
Cooling degree days, base 65°F
307
Growing degree days, base 40°F
4,020
Growing degree days, base 45°F
2,996
Growing degree days, base 50°F
2,103
Growing degree days, base 55°F
1,346
Growing degree days, base 60°F
740

Growing degree days by month, base 50°F

Heating and cooling by month

MonthHeating DDCooling DDGrowing DD 50
January1,33700
February1,17600
March1,04607
April615248
May3289192
June10651397
July20128573
August4683502
September19433297
October522278
November83708
December1,15901

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 12.1 km from Roscoe. 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 USC00301102 (Callicoon Ctr). Public domain.