Necedah climate

Necedah Frost Dates and Growing Season

NOAA 1991-2020 normals for Necedah, 0.6 km from Necedah, elevation 922 ft

Frost and the growing season

NOAA's 1991-2020 freeze probabilities for Necedah. 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 17 and the first fall freeze around September 25, a growing season of about 131 days.

Median at 36°F
last May 29, first September 16
Median at 32°F
last May 17, first September 25
Median at 28°F
last May 5, first October 3

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 18Jun 8Jun 4Jun 1May 29May 26May 23May 20May 12
32°FJun 1May 27May 23May 20May 17May 14May 9May 6May 2
28°FMay 21May 16May 12May 8May 5May 2Apr 30Apr 27Apr 22
24°FMay 10May 4May 1Apr 29Apr 25Apr 22Apr 19Apr 15Apr 9
20°FApr 30Apr 25Apr 21Apr 17Apr 14Apr 10Apr 7Apr 4Mar 31
16°FApr 22Apr 15Apr 10Apr 7Apr 5Apr 2Mar 31Mar 27Mar 20

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 1Sep 6Sep 10Sep 13Sep 16Sep 19Sep 22Sep 26Oct 1
32°FSep 12Sep 16Sep 19Sep 22Sep 25Sep 28Sep 30Oct 4Oct 8
28°FSep 20Sep 25Sep 28Oct 1Oct 3Oct 6Oct 8Oct 12Oct 19
24°FSep 28Oct 3Oct 7Oct 10Oct 14Oct 17Oct 20Oct 24Oct 30
20°FOct 8Oct 15Oct 20Oct 23Oct 26Oct 29Nov 1Nov 5Nov 9
16°FOct 21Oct 28Oct 31Nov 2Nov 5Nov 8Nov 11Nov 15Nov 20

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°F1311241191141101051019485
32°F152144139135131127122117109
28°F171163158154150146142137130
24°F193186181176172168163158150
20°F214207201196191188184180170
16°F235227222217213209203198191

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
7,773
Cooling degree days, base 65°F
525
Growing degree days, base 40°F
4,374
Growing degree days, base 45°F
3,357
Growing degree days, base 50°F
2,459
Growing degree days, base 55°F
1,676
Growing degree days, base 60°F
1,024

Growing degree days by month, base 50°F

Heating and cooling by month

MonthHeating DDCooling DDGrowing DD 50
January1,51600
February1,24700
March1,022013
April602460
May27029254
June66108492
July18190637
August35141570
September18148331
October534594
November93907
December1,34401

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 Necedah. 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 USC00475786 (Necedah). Public domain.