Minersville climate

Minersville Frost Dates and Growing Season

NOAA 1991-2020 normals for Milford, 22.4 km from Minersville, elevation 5009 ft

Frost and the growing season

NOAA's 1991-2020 freeze probabilities for Milford. 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 10 and the first fall freeze around October 2, a growing season of about 144 days.

Median at 36°F
last May 27, first September 24
Median at 32°F
last May 10, first October 2
Median at 28°F
last April 28, first October 12

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 15Jun 6Jun 2May 31May 27May 23May 18May 14May 8
32°FJun 1May 25May 19May 14May 10May 6May 2Apr 29Apr 25
28°FMay 16May 10May 4May 1Apr 28Apr 24Apr 21Apr 17Apr 11
24°FMay 2Apr 26Apr 21Apr 17Apr 13Apr 10Apr 6Apr 2Mar 29
20°FApr 17Apr 10Apr 5Apr 2Mar 30Mar 26Mar 21Mar 15Mar 9
16°FApr 2Mar 27Mar 21Mar 16Mar 11Mar 7Mar 3Feb 28Feb 20

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 9Sep 16Sep 19Sep 22Sep 24Sep 26Sep 28Oct 1Oct 5
32°FSep 20Sep 25Sep 28Sep 30Oct 2Oct 4Oct 7Oct 10Oct 15
28°FSep 30Oct 3Oct 6Oct 9Oct 12Oct 15Oct 18Oct 21Oct 25
24°FOct 8Oct 13Oct 17Oct 20Oct 22Oct 25Oct 27Nov 1Nov 5
20°FOct 19Oct 23Oct 26Oct 30Nov 1Nov 5Nov 7Nov 12Nov 17
16°FOct 27Nov 1Nov 5Nov 8Nov 11Nov 15Nov 18Nov 22Nov 26

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°F14013212712311811411010394
32°F164158153148144139133127118
28°F188181176172168164159154144
24°F212205199194191186181176168
20°F239231225220215211206201192
16°F268259253248242236231225217

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
5,515
Cooling degree days, base 65°F
827
Growing degree days, base 40°F
5,376
Growing degree days, base 45°F
4,131
Growing degree days, base 50°F
3,067
Growing degree days, base 55°F
2,169
Growing degree days, base 60°F
1,421

Growing degree days by month, base 50°F

Heating and cooling by month

MonthHeating DDCooling DDGrowing DD 50
January1,08000
February82501
March645020
April450083
May20623295
June38134546
July1316779
August3290751
September8463432
October3751145
November728014
December1,08001

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 22.4 km from Minersville. 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 USC00425654 (Milford). Public domain.