Ansted climate

Ansted Frost Dates and Growing Season

NOAA 1991-2020 normals for Anstead Hawks Nest SP, 2.3 km from Ansted, elevation 1296 ft

Frost and the growing season

NOAA's 1991-2020 freeze probabilities for Anstead Hawks Nest SP. 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 22 and the first fall freeze around October 22, a growing season of about 181 days.

Median at 36°F
last May 2, first October 14
Median at 32°F
last April 22, first October 22
Median at 28°F
last April 9, first November 1

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 20May 13May 8May 5May 2Apr 30Apr 27Apr 23Apr 20
32°FMay 9May 3Apr 30Apr 26Apr 22Apr 19Apr 16Apr 13Apr 8
28°FApr 25Apr 19Apr 15Apr 12Apr 9Apr 6Apr 2Mar 31Mar 24
24°FApr 11Apr 5Apr 2Mar 31Mar 28Mar 24Mar 20Mar 16Mar 10
20°FMar 31Mar 26Mar 22Mar 18Mar 15Mar 11Mar 7Mar 2Feb 23
16°FMar 21Mar 16Mar 12Mar 7Mar 3Feb 28Feb 24Feb 16Feb 9

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°FOct 1Oct 5Oct 8Oct 11Oct 14Oct 16Oct 18Oct 21Oct 25
32°FOct 8Oct 14Oct 17Oct 19Oct 22Oct 25Oct 28Oct 31Nov 3
28°FOct 19Oct 23Oct 27Oct 30Nov 1Nov 3Nov 6Nov 10Nov 15
24°FOct 29Nov 1Nov 5Nov 7Nov 11Nov 13Nov 17Nov 23Nov 30
20°FNov 5Nov 11Nov 15Nov 19Nov 23Nov 28Dec 1Dec 6Dec 14
16°FNov 13Nov 21Nov 27Dec 1Dec 6Dec 11Dec 17Dec 24Dec 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°F179173168164161157152148142
32°F200193189185181176172166159
28°F227218213209205201196191182
24°F252243238232227224218213206
20°F281272265259254249243237228
16°F308300292285279273266260251

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
4,908
Cooling degree days, base 65°F
815
Growing degree days, base 40°F
5,866
Growing degree days, base 45°F
4,554
Growing degree days, base 50°F
3,398
Growing degree days, base 55°F
2,388
Growing degree days, base 60°F
1,521

Growing degree days by month, base 50°F

Heating and cooling by month

MonthHeating DDCooling DDGrowing DD 50
January1,00708
February821012
March681256
April34913188
May14257387
June18161593
July2252715
August3225687
September6094486
October32112204
November618048
December887015

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 2.3 km from Ansted. 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 USC00460202 (Anstead Hawks Nest SP). Public domain.