Suring climate

Suring Frost Dates and Growing Season

NOAA 1991-2020 normals for Suring, 0.6 km from Suring, elevation 792 ft

Frost and the growing season

NOAA's 1991-2020 freeze probabilities for Suring. 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 14 and the first fall freeze around October 1, a growing season of about 139 days.

Median at 36°F
last May 26, first September 21
Median at 32°F
last May 14, first October 1
Median at 28°F
last May 2, first October 13

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 8Jun 2May 31May 29May 26May 23May 20May 16May 11
32°FMay 29May 24May 21May 17May 14May 11May 8May 5Apr 30
28°FMay 17May 12May 8May 5May 2Apr 30Apr 27Apr 24Apr 19
24°FMay 6Apr 30Apr 27Apr 24Apr 21Apr 19Apr 15Apr 11Apr 7
20°FApr 21Apr 18Apr 14Apr 11Apr 8Apr 5Apr 3Mar 31Mar 27
16°FApr 13Apr 8Apr 4Apr 2Apr 1Mar 29Mar 26Mar 22Mar 18

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 8Sep 13Sep 16Sep 18Sep 21Sep 24Sep 27Sep 29Oct 3
32°FSep 19Sep 24Sep 27Sep 30Oct 1Oct 4Oct 6Oct 9Oct 14
28°FSep 29Oct 3Oct 6Oct 9Oct 13Oct 15Oct 18Oct 22Oct 28
24°FOct 10Oct 15Oct 20Oct 23Oct 27Oct 30Nov 1Nov 4Nov 9
20°FOct 23Oct 30Nov 1Nov 4Nov 7Nov 10Nov 13Nov 17Nov 20
16°FNov 3Nov 7Nov 11Nov 14Nov 17Nov 19Nov 22Nov 25Nov 29

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°F137130126122117114110106100
32°F158151147143139136131126121
28°F181173169165161157153149141
24°F207200195190186182177172166
20°F229223218214210207202198191
16°F249242237234230226222218212

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
8,415
Cooling degree days, base 65°F
302
Growing degree days, base 40°F
3,762
Growing degree days, base 45°F
2,813
Growing degree days, base 50°F
1,985
Growing degree days, base 55°F
1,280
Growing degree days, base 60°F
707

Growing degree days by month, base 50°F

Heating and cooling by month

MonthHeating DDCooling DDGrowing DD 50
January1,56700
February1,32600
March1,11605
April703128
May34913182
June10359408
July38118546
August5185499
September23124262
October602253
November96202
December1,36900

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 0.6 km from Suring. 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 USC00478376 (Suring). Public domain.