Ringtown climate

Ringtown Frost Dates and Growing Season

NOAA 1991-2020 normals for Mahanoy City 2 N, 7.8 km from Ringtown, elevation 1710 ft

Frost and the growing season

NOAA's 1991-2020 freeze probabilities for Mahanoy City 2 N. 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 22, a growing season of about 175 days.

Median at 36°F
last May 11, first October 10
Median at 32°F
last April 30, first October 22
Median at 28°F
last April 16, first November 1

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 3Apr 30Apr 24
32°FMay 18May 12May 7May 4Apr 30Apr 26Apr 23Apr 19Apr 15
28°FMay 6Apr 29Apr 23Apr 19Apr 16Apr 12Apr 9Apr 6Apr 2
24°FApr 18Apr 11Apr 8Apr 5Apr 3Apr 1Mar 30Mar 26Mar 21
20°FApr 5Apr 2Mar 31Mar 28Mar 26Mar 23Mar 20Mar 17Mar 13
16°FMar 29Mar 26Mar 22Mar 19Mar 17Mar 15Mar 11Mar 8Mar 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 28Oct 1Oct 4Oct 7Oct 10Oct 13Oct 16Oct 19Oct 23
32°FOct 7Oct 13Oct 16Oct 19Oct 22Oct 24Oct 26Oct 30Nov 3
28°FOct 20Oct 25Oct 28Oct 31Nov 1Nov 4Nov 7Nov 10Nov 14
24°FNov 1Nov 4Nov 6Nov 9Nov 12Nov 14Nov 17Nov 20Nov 25
20°FNov 8Nov 13Nov 16Nov 19Nov 22Nov 26Nov 29Dec 3Dec 8
16°FNov 17Nov 22Nov 28Dec 1Dec 4Dec 7Dec 12Dec 17Dec 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°F172165160155151146141137129
32°F195188183179175170166160152
28°F218212207203199195189183175
24°F240234229225222218215210204
20°F263255250245242238234229224
16°F287278272267262257252247240

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
6,616
Cooling degree days, base 65°F
452
Growing degree days, base 40°F
4,561
Growing degree days, base 45°F
3,464
Growing degree days, base 50°F
2,499
Growing degree days, base 55°F
1,663
Growing degree days, base 60°F
975

Growing degree days by month, base 50°F

Heating and cooling by month

MonthHeating DDCooling DDGrowing DD 50
January1,23800
February1,08301
March950013
April543373
May26414241
June5986478
July10177632
August24120561
September13849364
October4443117
November775017
December1,08802

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 7.8 km from Ringtown. 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 USC00365344 (Mahanoy City 2 N). Public domain.