Saegertown climate

Saegertown Frost Dates and Growing Season

NOAA 1991-2020 normals for Port Meadville AP, 11.7 km from Saegertown, elevation 1400 ft

Frost and the growing season

NOAA's 1991-2020 freeze probabilities for Port Meadville AP. 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 30 and the first fall freeze around October 23, a growing season of about 175 days.

Median at 36°F
last May 11, first October 9
Median at 32°F
last April 30, first October 23
Median at 28°F
last April 18, first November 4

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 26May 22May 18May 15May 11May 7May 4Apr 30Apr 26
32°FMay 18May 11May 7May 3Apr 30Apr 28Apr 24Apr 21Apr 16
28°FMay 5Apr 29Apr 25Apr 21Apr 18Apr 16Apr 11Apr 7Apr 2
24°FApr 20Apr 16Apr 12Apr 7Apr 5Apr 3Mar 31Mar 29Mar 23
20°FApr 7Apr 3Mar 31Mar 29Mar 27Mar 24Mar 20Mar 17Mar 12
16°FMar 30Mar 27Mar 24Mar 20Mar 18Mar 15Mar 12Mar 9Mar 3

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 28Oct 1Oct 4Oct 6Oct 9Oct 12Oct 15Oct 18Oct 23
32°FOct 6Oct 11Oct 16Oct 20Oct 23Oct 26Oct 29Nov 1Nov 7
28°FOct 20Oct 27Oct 31Nov 2Nov 4Nov 6Nov 10Nov 14Nov 20
24°FNov 4Nov 7Nov 10Nov 12Nov 15Nov 18Nov 22Nov 26Dec 2
20°FNov 9Nov 14Nov 18Nov 23Nov 26Nov 30Dec 4Dec 8Dec 14
16°FNov 17Nov 24Nov 30Dec 3Dec 7Dec 11Dec 15Dec 21Dec 28

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°F172165160155151147143139132
32°F196189184179175170166161153
28°F223215210205200196192187179
24°F245239233229224221216211205
20°F267259254249245241236230222
16°F288280275269265260255250241

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
6,454
Cooling degree days, base 65°F
511
Growing degree days, base 40°F
4,732
Growing degree days, base 45°F
3,603
Growing degree days, base 50°F
2,614
Growing degree days, base 55°F
1,759
Growing degree days, base 60°F
1,051

Growing degree days by month, base 50°F

Heating and cooling by month

MonthHeating DDCooling DDGrowing DD 50
January1,22602
February1,05803
March926121
April532487
May24433279
June6598484
July12181634
August22139583
September13448369
October4387127
November741023
December1,05704

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 11.7 km from Saegertown. 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 USW00004843 (Port Meadville AP). Public domain.