Fox Point climate

Fox Point Frost Dates and Growing Season

NOAA 1991-2020 normals for Mt Mary College, 14.1 km from Fox Point, elevation 715 ft

Frost and the growing season

NOAA's 1991-2020 freeze probabilities for Mt Mary College. 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 26 and the first fall freeze around October 18, a growing season of about 173 days.

Median at 36°F
last May 8, first October 6
Median at 32°F
last April 26, first October 18
Median at 28°F
last April 14, first October 30

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 24May 19May 15May 11May 8May 5May 2Apr 30Apr 24
32°FMay 12May 6May 2Apr 29Apr 26Apr 23Apr 20Apr 16Apr 12
28°FApr 30Apr 24Apr 20Apr 16Apr 14Apr 11Apr 8Apr 5Apr 1
24°FApr 17Apr 12Apr 9Apr 6Apr 4Apr 2Mar 31Mar 27Mar 20
20°FApr 7Apr 3Mar 31Mar 28Mar 25Mar 22Mar 18Mar 15Mar 10
16°FMar 31Mar 25Mar 22Mar 18Mar 15Mar 12Mar 9Mar 6Mar 1

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 25Sep 29Oct 2Oct 4Oct 6Oct 9Oct 12Oct 16Oct 22
32°FOct 2Oct 7Oct 12Oct 15Oct 18Oct 22Oct 24Oct 27Nov 1
28°FOct 13Oct 19Oct 23Oct 27Oct 30Nov 1Nov 3Nov 6Nov 11
24°FOct 27Nov 1Nov 3Nov 5Nov 9Nov 11Nov 14Nov 18Nov 23
20°FNov 4Nov 10Nov 12Nov 16Nov 19Nov 22Nov 25Nov 29Dec 4
16°FNov 12Nov 18Nov 21Nov 25Nov 27Dec 1Dec 4Dec 8Dec 16

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°F168163158154150146142137130
32°F192186181177173169165161153
28°F217210205200196192188184178
24°F237231227223220216212208202
20°F260253249244239236231226219
16°F278271265261257252248243236

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
6,792
Cooling degree days, base 65°F
728
Growing degree days, base 40°F
4,841
Growing degree days, base 45°F
3,753
Growing degree days, base 50°F
2,804
Growing degree days, base 55°F
1,982
Growing degree days, base 60°F
1,287

Growing degree days by month, base 50°F

Heating and cooling by month

MonthHeating DDCooling DDGrowing DD 50
January1,33600
February1,11601
March928116
April568364
May26936260
June57144537
July7256715
August12204657
September12076410
October4348129
November796014
December1,15001

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 14.1 km from Fox Point. 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 USC00475474 (Mt Mary College). Public domain.