Spring Hill climate

Spring Hill Frost Dates and Growing Season

NOAA 1991-2020 normals for Thompson Stn, 1.4 km from Spring Hill, elevation 775 ft

Frost and the growing season

NOAA's 1991-2020 freeze probabilities for Thompson Stn. 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 April 3 and the first fall freeze around November 1, a growing season of about 211 days.

Median at 36°F
last April 17, first October 23
Median at 32°F
last April 3, first November 1
Median at 28°F
last March 23, first November 11

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

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°F210203198194189185181175169
32°F233225219215211206201196190
28°F258250244238232227223217209
24°F287276270264259254248242233
20°F316305297292286280274266258
16°F340332325318311305299292281

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
98% 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
3,642
Cooling degree days, base 65°F
1,728
Growing degree days, base 40°F
7,644
Growing degree days, base 45°F
6,167
Growing degree days, base 50°F
4,827
Growing degree days, base 55°F
3,639
Growing degree days, base 60°F
2,609

Growing degree days by month, base 50°F

Heating and cooling by month

MonthHeating DDCooling DDGrowing DD 50
January835025
February660138
March4716126
April21238301
May56155565
June1342790
July0446911
August0431896
September17251684
October18254351
November4724103
December735138

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 1.4 km from Spring Hill. 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 USC00408953 (Thompson Stn). Public domain.