Modena climate

Modena Frost Dates and Growing Season

NOAA 1991-2020 normals for Coatesville 2 W, 5.7 km from Modena, elevation 640 ft

Frost and the growing season

NOAA's 1991-2020 freeze probabilities for Coatesville 2 W. 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 19 and the first fall freeze around October 25, a growing season of about 190 days.

Median at 36°F
last May 1, first October 13
Median at 32°F
last April 19, first October 25
Median at 28°F
last April 3, first November 6

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 17May 10May 7May 3May 1Apr 28Apr 25Apr 22Apr 18
32°FMay 4Apr 29Apr 24Apr 21Apr 19Apr 16Apr 12Apr 9Apr 3
28°FApr 18Apr 12Apr 8Apr 6Apr 3Apr 1Mar 29Mar 26Mar 19
24°FApr 4Apr 1Mar 29Mar 26Mar 22Mar 20Mar 16Mar 12Mar 6
20°FMar 27Mar 21Mar 18Mar 15Mar 11Mar 8Mar 4Mar 1Feb 24
16°FMar 19Mar 12Mar 8Mar 4Mar 1Feb 26Feb 23Feb 17Feb 10

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 1Oct 5Oct 8Oct 11Oct 13Oct 15Oct 18Oct 21Oct 26
32°FOct 11Oct 15Oct 19Oct 22Oct 25Oct 28Oct 31Nov 3Nov 7
28°FOct 24Oct 29Nov 1Nov 3Nov 6Nov 8Nov 11Nov 15Nov 21
24°FNov 4Nov 9Nov 12Nov 15Nov 19Nov 22Nov 26Dec 1Dec 5
20°FNov 14Nov 19Nov 24Nov 29Dec 1Dec 5Dec 9Dec 14Dec 21
16°FNov 30Dec 4Dec 8Dec 13Dec 18Dec 21Dec 25Jan 1Jan 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°F183177173169165162157153146
32°F208202198194190185181176169
28°F236229223220216212209204198
24°F263256250245241237233228222
20°F290280273269264260255249242
16°F314306300295290285280274265

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
5,338
Cooling degree days, base 65°F
909
Growing degree days, base 40°F
5,633
Growing degree days, base 45°F
4,390
Growing degree days, base 50°F
3,302
Growing degree days, base 55°F
2,359
Growing degree days, base 60°F
1,558

Growing degree days by month, base 50°F

Heating and cooling by month

MonthHeating DDCooling DDGrowing DD 50
January1,07903
February91402
March763022
April4157124
May16053361
June26173597
July1310775
August4255716
September67100484
October34410174
November636039
December93007

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 5.7 km from Modena. 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 USC00361591 (Coatesville 2 W). Public domain.