New Matamoras climate

New Matamoras Frost Dates and Growing Season

NOAA 1991-2020 normals for Middlebourne 3 Ese, 19 km from New Matamoras, elevation 779 ft

Frost and the growing season

NOAA's 1991-2020 freeze probabilities for Middlebourne 3 Ese. 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 May 1 and the first fall freeze around October 15, a growing season of about 167 days.

Median at 36°F
last May 12, first October 5
Median at 32°F
last May 1, first October 15
Median at 28°F
last April 20, first October 25

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

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°F166160155151147142138133128
32°F185179175171167162157152144
28°F206200195191187183179174166
24°F230223218215211207203198193
20°F259251244239235230226220213
16°F290282273266260255249243235

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
100% 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
5,577
Cooling degree days, base 65°F
732
Growing degree days, base 40°F
5,392
Growing degree days, base 45°F
4,168
Growing degree days, base 50°F
3,091
Growing degree days, base 55°F
2,159
Growing degree days, base 60°F
1,369

Growing degree days by month, base 50°F

Heating and cooling by month

MonthHeating DDCooling DDGrowing DD 50
January1,10805
February92706
March772135
April4226136
May18147343
June35143558
July3239701
August7205663
September8982444
October38310159
November693032
December95609

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 km from New Matamoras. 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 USC00465963 (Middlebourne 3 Ese). Public domain.