Hanson climate

Hanson Frost Dates and Growing Season

NOAA 1991-2020 normals for Madisonville, 8.6 km from Hanson, elevation 425 ft

Frost and the growing season

NOAA's 1991-2020 freeze probabilities for Madisonville. 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 2 and the first fall freeze around November 1, a growing season of about 212 days.

Median at 36°F
last April 14, first October 23
Median at 32°F
last April 2, first November 1
Median at 28°F
last March 22, first November 12

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

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°F211204199195191187183178172
32°F235226221216212209204199193
28°F259250244239234229225219212
24°F287277270263258252247242233
20°F312302295288282276271262252
16°F335326319311305300293286276

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
99% 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
3,749
Cooling degree days, base 65°F
1,763
Growing degree days, base 40°F
7,636
Growing degree days, base 45°F
6,185
Growing degree days, base 50°F
4,871
Growing degree days, base 55°F
3,693
Growing degree days, base 60°F
2,659

Growing degree days by month, base 50°F

Heating and cooling by month

MonthHeating DDCooling DDGrowing DD 50
January882019
February680136
March48510132
April19256336
May48174591
June2347795
July0453918
August0419883
September22238666
October18460355
November4826111
December772030

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 8.6 km from Hanson. 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 USC00155067 (Madisonville). Public domain.