Redfield climate

Redfield Frost Dates and Growing Season

NOAA 1991-2020 normals for Redfield, 1.3 km from Redfield, elevation 1309 ft

Frost and the growing season

NOAA's 1991-2020 freeze probabilities for Redfield. 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 16, first September 23
Median at 32°F
last May 8, first October 1
Median at 28°F
last April 29, first October 8

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 29May 25May 21May 18May 16May 14May 11May 8May 5
32°FMay 21May 16May 13May 10May 8May 5May 2Apr 30Apr 25
28°FMay 12May 7May 4May 1Apr 29Apr 26Apr 23Apr 19Apr 14
24°FMay 4Apr 30Apr 25Apr 22Apr 19Apr 16Apr 12Apr 9Apr 5
20°FApr 26Apr 20Apr 16Apr 13Apr 10Apr 8Apr 5Apr 2Mar 27
16°FApr 16Apr 11Apr 7Apr 5Apr 3Mar 31Mar 28Mar 22Mar 15

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

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°F146140136133129126123118112
32°F162157153149145142138134128
28°F180174169165162158154150142
24°F198191186182179175171166158
20°F219212207203198194190185178
16°F238231225220215211207201194

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
8,245
Cooling degree days, base 65°F
617
Growing degree days, base 40°F
4,400
Growing degree days, base 45°F
3,410
Growing degree days, base 50°F
2,534
Growing degree days, base 55°F
1,771
Growing degree days, base 60°F
1,130

Growing degree days by month, base 50°F

Heating and cooling by month

MonthHeating DDCooling DDGrowing DD 50
January1,61600
February1,33500
March1,06704
April634148
May28724243
June56119513
July12235688
August28178615
September17860345
October584274
November1,01004
December1,43800

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 1.3 km from Redfield. 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 USC00397052 (Redfield). Public domain.