Timpson climate

Timpson Frost Dates and Growing Season

NOAA 1991-2020 normals for Center, 24.3 km from Timpson, elevation 325 ft

Frost and the growing season

NOAA's 1991-2020 freeze probabilities for Center. 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 13 and the first fall freeze around November 15, a growing season of about 248 days.

Median at 36°F
last March 30, first November 5
Median at 32°F
last March 13, first November 15
Median at 28°F
last February 28, first November 28

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

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 23Oct 28Oct 31Nov 2Nov 5Nov 7Nov 10Nov 15Nov 21
32°FNov 1Nov 4Nov 7Nov 11Nov 15Nov 19Nov 24Nov 29Dec 4
28°FNov 8Nov 14Nov 20Nov 24Nov 28Dec 1Dec 5Dec 11Dec 23
24°FNov 19Nov 28Dec 2Dec 8Dec 15Dec 23Dec 30Jan 5Jan 14
20°FDec 7Dec 17Dec 24Dec 31Jan 3Jan 7Jan 12Jan 21Feb 4
16°FDec 17Dec 25Jan 1Jan 2Jan 5Jan 9Jan 16Jan 25Feb 3

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°F249239232227221216212206198
32°F276266259253248241235229220
28°F310299290282276270263256246
24°F351337329320310303296287274
20°F365365365361351342334325310
16°F365365365365365365365361343

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
97% of years
20°F or colder
69% of years
16°F or colder
27% 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
2,241
Cooling degree days, base 65°F
2,485
Growing degree days, base 40°F
9,458
Growing degree days, base 45°F
7,780
Growing degree days, base 50°F
6,229
Growing degree days, base 55°F
4,824
Growing degree days, base 60°F
3,571

Growing degree days by month, base 50°F

Heating and cooling by month

MonthHeating DDCooling DDGrowing DD 50
January560586
February40810122
March25433277
April10093446
May14260711
June0444894
July05581,023
August05551,020
September5364810
October84129513
November30326223
December5148104

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 24.3 km from Timpson. 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 USC00411578 (Center). Public domain.