Newville climate

Newville Frost Dates and Growing Season

NOAA 1991-2020 normals for Bloserville 1 N, 10.5 km from Newville, elevation 700 ft

Frost and the growing season

NOAA's 1991-2020 freeze probabilities for Bloserville 1 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 18 and the first fall freeze around October 26, a growing season of about 191 days.

Median at 36°F
last May 1, first October 14
Median at 32°F
last April 18, first October 26
Median at 28°F
last April 3, first November 9

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 20May 14May 9May 4May 1Apr 28Apr 24Apr 21Apr 17
32°FMay 8Apr 30Apr 25Apr 21Apr 18Apr 15Apr 12Apr 8Apr 3
28°FApr 17Apr 11Apr 8Apr 6Apr 3Apr 1Mar 31Mar 27Mar 21
24°FApr 5Apr 1Mar 30Mar 26Mar 24Mar 20Mar 17Mar 14Mar 8
20°FMar 29Mar 24Mar 20Mar 16Mar 14Mar 10Mar 7Mar 3Feb 26
16°FMar 19Mar 14Mar 10Mar 7Mar 4Mar 1Feb 26Feb 20Feb 12

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°FOct 2Oct 6Oct 9Oct 12Oct 14Oct 17Oct 20Oct 25Oct 31
32°FOct 11Oct 15Oct 19Oct 22Oct 26Oct 30Nov 2Nov 6Nov 11
28°FOct 22Oct 29Nov 2Nov 6Nov 9Nov 12Nov 15Nov 20Nov 25
24°FNov 6Nov 12Nov 16Nov 19Nov 23Nov 26Nov 30Dec 4Dec 11
20°FNov 18Nov 24Nov 29Dec 2Dec 5Dec 9Dec 14Dec 19Dec 25
16°FDec 1Dec 7Dec 11Dec 16Dec 20Dec 23Dec 27Jan 1Jan 8

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°F185179174169165161156151143
32°F212204199194191186182176168
28°F239233227222218214209204196
24°F267259252248244239235230223
20°F292283277272268264258253244
16°F312304299295290285281275268

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
5,543
Cooling degree days, base 65°F
773
Growing degree days, base 40°F
5,383
Growing degree days, base 45°F
4,163
Growing degree days, base 50°F
3,092
Growing degree days, base 55°F
2,168
Growing degree days, base 60°F
1,395

Growing degree days by month, base 50°F

Heating and cooling by month

MonthHeating DDCooling DDGrowing DD 50
January1,11001
February93401
March794022
April4407115
May18642326
June39145556
July2264727
August5222682
September7886458
October3597162
November644036
December95306

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 10.5 km from Newville. Low ground, valleys and open fields freeze earlier and later than a town center or a hillside.

More

Sources

NOAA NCEI U.S. Climate Normals, 1991-2020, annual and seasonal normals for station USC00360763 (Bloserville 1 N). Public domain.