Bartonville climate

Bartonville Frost Dates and Growing Season

NOAA 1991-2020 normals for Grapevine Dam, 15.4 km from Bartonville, elevation 585 ft

Frost and the growing season

NOAA's 1991-2020 freeze probabilities for Grapevine Dam. 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 March 14 and the first fall freeze around November 17, a growing season of about 249 days.

Median at 36°F
last March 29, first November 7
Median at 32°F
last March 14, first November 17
Median at 28°F
last March 1, first November 29

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°FApr 15Apr 9Apr 5Apr 2Mar 29Mar 25Mar 20Mar 15Mar 8
32°FApr 3Mar 29Mar 23Mar 18Mar 14Mar 11Mar 6Mar 1Feb 23
28°FMar 20Mar 14Mar 9Mar 5Mar 1Feb 25Feb 20Feb 13Feb 4
24°FMar 11Mar 2Feb 24Feb 18Feb 12Feb 6Jan 31Jan 26Jan 17
20°FFeb 24Feb 13Feb 6Feb 1Jan 28Jan 22Jan 15Jan 7Dec 26
16°FFeb 11Feb 2Jan 27Jan 22Jan 17Jan 12Jan 6Dec 31Dec 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°FOct 26Oct 30Nov 2Nov 5Nov 7Nov 10Nov 14Nov 18Nov 23
32°FNov 2Nov 6Nov 9Nov 13Nov 17Nov 21Nov 25Nov 29Dec 4
28°FNov 9Nov 15Nov 21Nov 26Nov 29Dec 2Dec 7Dec 13Dec 20
24°FNov 18Nov 27Dec 2Dec 7Dec 13Dec 19Dec 26Jan 3Jan 14
20°FDec 1Dec 10Dec 17Dec 25Jan 1Jan 6Jan 13Jan 20Feb 3
16°FDec 12Dec 21Dec 31Jan 3Jan 8Jan 14Jan 19Jan 26Feb 2

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°F248240234228223219214208200
32°F275265259254249243238232223
28°F305294287281275268262255247
24°F342330322314306299292283271
20°F365364354346340333326317303
16°F365365365365365361352343330

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
99% of years
20°F or colder
83% of years
16°F or colder
42% 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
2,437
Cooling degree days, base 65°F
2,626
Growing degree days, base 40°F
9,458
Growing degree days, base 45°F
7,811
Growing degree days, base 50°F
6,289
Growing degree days, base 55°F
4,913
Growing degree days, base 60°F
3,689

Growing degree days by month, base 50°F

Heating and cooling by month

MonthHeating DDCooling DDGrowing DD 50
January625257
February4445105
March29028253
April10284438
May18255702
June0479928
July06111,076
August06141,079
September6385829
October86140524
November30621220
December561378

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 15.4 km from Bartonville. 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 USC00413691 (Grapevine Dam). Public domain.