Nyssa climate

Nyssa Frost Dates and Growing Season

NOAA 1991-2020 normals for Nyssa, 0.4 km from Nyssa, elevation 2175 ft

Frost and the growing season

NOAA's 1991-2020 freeze probabilities for Nyssa. 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 April 18 and the first fall freeze around October 18, a growing season of about 182 days.

Median at 36°F
last May 1, first October 6
Median at 32°F
last April 18, first October 18
Median at 28°F
last March 31, first October 28

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 19May 11May 7May 4May 1Apr 29Apr 26Apr 22Apr 17
32°FMay 4Apr 28Apr 25Apr 22Apr 18Apr 15Apr 11Apr 6Mar 30
28°FApr 20Apr 13Apr 8Apr 4Mar 31Mar 28Mar 21Mar 15Mar 9
24°FApr 3Mar 27Mar 18Mar 12Mar 8Mar 4Feb 28Feb 25Feb 17
20°FMar 10Mar 4Feb 28Feb 26Feb 21Feb 17Feb 12Feb 7Jan 28
16°FMar 1Feb 24Feb 16Feb 10Feb 4Jan 30Jan 21Jan 10Dec 30

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 26Sep 29Oct 1Oct 4Oct 6Oct 9Oct 12Oct 15Oct 19
32°FOct 4Oct 8Oct 12Oct 15Oct 18Oct 21Oct 23Oct 28Nov 1
28°FOct 14Oct 18Oct 22Oct 25Oct 28Oct 31Nov 3Nov 7Nov 13
24°FOct 23Oct 27Nov 1Nov 4Nov 8Nov 12Nov 17Nov 21Nov 25
20°FNov 1Nov 5Nov 11Nov 16Nov 21Nov 25Nov 29Dec 4Dec 12
16°FNov 8Nov 16Nov 24Nov 28Dec 1Dec 6Dec 12Dec 19Dec 31

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°F177170165162157153149145137
32°F204196190186182177172167160
28°F237229223216210205200193187
24°F269261254249244237231224212
20°F305293286280273267261254244
16°F339328316309301294284277267

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
98% 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
5,666
Cooling degree days, base 65°F
894
Growing degree days, base 40°F
5,300
Growing degree days, base 45°F
4,089
Growing degree days, base 50°F
3,050
Growing degree days, base 55°F
2,187
Growing degree days, base 60°F
1,469

Growing degree days by month, base 50°F

Heating and cooling by month

MonthHeating DDCooling DDGrowing DD 50
January1,09100
February81801
March642017
April432188
May19335314
June57132525
July4364825
August9292749
September9768423
October4371104
November80803
December1,07901

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 0.4 km from Nyssa. 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 USC00356179 (Nyssa). Public domain.