Fountain Green climate

Fountain Green Frost Dates and Growing Season

NOAA 1991-2020 normals for Moroni, 12.2 km from Fountain Green, elevation 5580 ft

Frost and the growing season

NOAA's 1991-2020 freeze probabilities for Moroni. 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 26 and the first fall freeze around September 25, a growing season of about 119 days.

Median at 36°F
last June 10, first September 16
Median at 32°F
last May 26, first September 25
Median at 28°F
last May 10, first October 5

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 28Jun 22Jun 18Jun 13Jun 10Jun 6Jun 4Jun 1May 27
32°FJun 13Jun 6Jun 3May 31May 26May 23May 19May 15May 10
28°FMay 30May 21May 16May 13May 10May 7May 3Apr 30Apr 25
24°FMay 11May 6May 3Apr 30Apr 27Apr 24Apr 20Apr 16Apr 11
20°FApr 29Apr 23Apr 18Apr 14Apr 10Apr 6Apr 2Mar 29Mar 18
16°FApr 10Apr 4Mar 30Mar 24Mar 18Mar 13Mar 9Mar 5Feb 28

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 1Sep 5Sep 9Sep 13Sep 16Sep 19Sep 21Sep 24Sep 27
32°FSep 9Sep 15Sep 19Sep 22Sep 25Sep 27Sep 30Oct 4Oct 8
28°FSep 21Sep 26Sep 29Oct 1Oct 5Oct 7Oct 11Oct 15Oct 20
24°FOct 1Oct 6Oct 10Oct 14Oct 17Oct 20Oct 23Oct 26Nov 1
20°FOct 13Oct 19Oct 23Oct 26Oct 29Nov 1Nov 4Nov 7Nov 12
16°FOct 25Oct 31Nov 3Nov 6Nov 9Nov 12Nov 15Nov 19Nov 24

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°F115109103989490857970
32°F14113312812411911511010598
28°F168160155151147142138132121
24°F193187182177172168162157150
20°F227216211205200195190184177
16°F259251245240234229222215206

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
6,724
Cooling degree days, base 65°F
381
Growing degree days, base 40°F
4,247
Growing degree days, base 45°F
3,149
Growing degree days, base 50°F
2,223
Growing degree days, base 55°F
1,465
Growing degree days, base 60°F
845

Growing degree days by month, base 50°F

Heating and cooling by month

MonthHeating DDCooling DDGrowing DD 50
January1,22400
February96500
March78005
April576031
May3404169
June10147398
July9179635
August13133584
September15318323
October496073
November84904
December1,21800

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 12.2 km from Fountain Green. 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 USC00425837 (Moroni). Public domain.