Washingtonville climate

Washingtonville Frost Dates and Growing Season

NOAA 1991-2020 normals for Millport 4 Ne, 16.5 km from Washingtonville, elevation 1170 ft

Frost and the growing season

NOAA's 1991-2020 freeze probabilities for Millport 4 Ne. 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 2 and the first fall freeze around October 13, a growing season of about 165 days.

Median at 36°F
last May 14, first October 4
Median at 32°F
last May 2, first October 13
Median at 28°F
last April 20, first October 26

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 28May 24May 21May 17May 14May 10May 6May 2Apr 27
32°FMay 20May 14May 10May 6May 2Apr 29Apr 26Apr 22Apr 18
28°FMay 9May 2Apr 27Apr 23Apr 20Apr 18Apr 15Apr 10Apr 4
24°FApr 25Apr 19Apr 15Apr 11Apr 8Apr 5Apr 2Mar 30Mar 23
20°FApr 12Apr 6Apr 3Mar 31Mar 28Mar 25Mar 21Mar 18Mar 12
16°FApr 3Mar 30Mar 26Mar 22Mar 19Mar 16Mar 12Mar 8Mar 2

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 21Sep 25Sep 29Oct 1Oct 4Oct 6Oct 9Oct 13Oct 17
32°FOct 1Oct 4Oct 7Oct 10Oct 13Oct 16Oct 21Oct 24Oct 29
28°FOct 9Oct 14Oct 17Oct 22Oct 26Oct 29Nov 1Nov 4Nov 10
24°FOct 20Oct 28Nov 1Nov 4Nov 6Nov 10Nov 13Nov 19Nov 25
20°FNov 4Nov 9Nov 12Nov 16Nov 20Nov 25Nov 29Dec 2Dec 8
16°FNov 12Nov 18Nov 23Nov 28Dec 2Dec 5Dec 10Dec 16Dec 23

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°F164157152147142138134129123
32°F187180174169165160155150142
28°F210202196192187183179172163
24°F237229222217213208203197190
20°F263254247242237233227222215
16°F285275269263257252247241233

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
6,096
Cooling degree days, base 65°F
615
Growing degree days, base 40°F
5,025
Growing degree days, base 45°F
3,857
Growing degree days, base 50°F
2,823
Growing degree days, base 55°F
1,938
Growing degree days, base 60°F
1,194

Growing degree days by month, base 50°F

Heating and cooling by month

MonthHeating DDCooling DDGrowing DD 50
January1,19602
February1,00702
March853025
April4766109
May22034295
June49122524
July9204660
August14182632
September11259401
October4047142
November722027
December1,03504

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 16.5 km from Washingtonville. 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 USC00335315 (Millport 4 Ne). Public domain.