Savoy climate

Savoy Frost Dates and Growing Season

NOAA 1991-2020 normals for Bonham 3NNE, 19.2 km from Savoy, elevation 592 ft

Frost and the growing season

NOAA's 1991-2020 freeze probabilities for Bonham 3NNE. 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 16 and the first fall freeze around November 13, a growing season of about 242 days.

Median at 36°F
last March 31, first November 3
Median at 32°F
last March 16, first November 13
Median at 28°F
last March 4, first November 24

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

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

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°F242234227222217212208201193
32°F268259252247242237230224215
28°F291282276270265260254248238
24°F326314305299292285278271262
20°F365350341332325317309302289
16°F365365365363354345334325312

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
90% of years
16°F or colder
61% 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
2,822
Cooling degree days, base 65°F
2,310
Growing degree days, base 40°F
8,817
Growing degree days, base 45°F
7,222
Growing degree days, base 50°F
5,764
Growing degree days, base 55°F
4,455
Growing degree days, base 60°F
3,301

Growing degree days by month, base 50°F

Heating and cooling by month

MonthHeating DDCooling DDGrowing DD 50
January689139
February516271
March34415200
April13658381
May25211651
June0428877
July05741,038
August05611,026
September10335775
October112107468
November36316180
December626257

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 19.2 km from Savoy. 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 USC00410923 (Bonham 3NNE). Public domain.