Ferron climate

Ferron Frost Dates and Growing Season

NOAA 1991-2020 normals for Ferron, 0.7 km from Ferron, elevation 5923 ft

Frost and the growing season

NOAA's 1991-2020 freeze probabilities for Ferron. 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 6 and the first fall freeze around October 10, a growing season of about 156 days.

Median at 36°F
last May 21, first October 1
Median at 32°F
last May 6, first October 10
Median at 28°F
last April 23, first October 19

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

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°F152145140136131126122115108
32°F173168164159156151146140132
28°F198191185181177173168164156
24°F228220214210204199194188180
20°F257248242237232227222216207
16°F283274269264259255250242233

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
6,308
Cooling degree days, base 65°F
755
Growing degree days, base 40°F
4,960
Growing degree days, base 45°F
3,844
Growing degree days, base 50°F
2,871
Growing degree days, base 55°F
2,036
Growing degree days, base 60°F
1,330

Growing degree days by month, base 50°F

Heating and cooling by month

MonthHeating DDCooling DDGrowing DD 50
January1,22600
February93700
March740014
April502174
May24424271
June50148548
July4299761
August6222680
September10560410
October4502109
November84004
December1,20600

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 0.7 km from Ferron. 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 USC00422798 (Ferron). Public domain.