Croghan climate

Croghan Frost Dates and Growing Season

NOAA 1991-2020 normals for Lowville, 13.6 km from Croghan, elevation 863 ft

Frost and the growing season

NOAA's 1991-2020 freeze probabilities for Lowville. 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 8 and the first fall freeze around October 1, a growing season of about 145 days.

Median at 36°F
last May 22, first September 21
Median at 32°F
last May 8, first October 1
Median at 28°F
last April 28, first October 15

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 4May 31May 28May 25May 22May 19May 15May 12May 7
32°FMay 23May 19May 15May 11May 8May 6May 3Apr 30Apr 26
28°FMay 11May 6May 2Apr 30Apr 28Apr 24Apr 22Apr 19Apr 14
24°FApr 28Apr 23Apr 20Apr 18Apr 15Apr 12Apr 10Apr 7Apr 4
20°FApr 17Apr 14Apr 10Apr 7Apr 5Apr 3Apr 1Mar 31Mar 25
16°FApr 11Apr 5Apr 3Apr 2Mar 31Mar 29Mar 26Mar 22Mar 17

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 9Sep 13Sep 16Sep 19Sep 21Sep 24Sep 26Sep 29Oct 3
32°FSep 19Sep 23Sep 26Sep 29Oct 1Oct 4Oct 7Oct 11Oct 17
28°FSep 30Oct 4Oct 7Oct 12Oct 15Oct 18Oct 22Oct 26Nov 1
24°FOct 12Oct 18Oct 23Oct 27Oct 31Nov 1Nov 5Nov 8Nov 14
20°FOct 30Nov 2Nov 4Nov 7Nov 10Nov 13Nov 16Nov 19Nov 23
16°FNov 5Nov 11Nov 13Nov 16Nov 19Nov 22Nov 25Nov 29Dec 4

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°F140134130125121117113109103
32°F165158153148145141136132125
28°F190183179174170166162157150
24°F215209205201197193188183176
20°F236229225221217214211207201
16°F253246242237233230227222215

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
8,050
Cooling degree days, base 65°F
320
Growing degree days, base 40°F
3,882
Growing degree days, base 45°F
2,896
Growing degree days, base 50°F
2,047
Growing degree days, base 55°F
1,320
Growing degree days, base 60°F
734

Growing degree days by month, base 50°F

Heating and cooling by month

MonthHeating DDCooling DDGrowing DD 50
January1,47901
February1,28500
March1,14704
April697135
May34115191
June11161403
July33121553
August5492502
September21928278
October556271
November87809
December1,25101

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 13.6 km from Croghan. 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 USC00304912 (Lowville). Public domain.