Salunga climate

Salunga Frost Dates and Growing Season

NOAA 1991-2020 normals for Landisville 2 Nw, 2 km from Salunga, elevation 360 ft

Frost and the growing season

NOAA's 1991-2020 freeze probabilities for Landisville 2 Nw. 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 10, a growing season of about 162 days.

Median at 36°F
last May 9, first September 30
Median at 32°F
last April 30, first October 10
Median at 28°F
last April 18, first October 24

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 22May 18May 15May 12May 9May 6May 4May 1Apr 28
32°FMay 13May 8May 5May 2Apr 30Apr 28Apr 25Apr 21Apr 16
28°FMay 2Apr 28Apr 24Apr 21Apr 18Apr 16Apr 13Apr 9Apr 5
24°FApr 19Apr 15Apr 11Apr 7Apr 5Apr 2Mar 31Mar 28Mar 22
20°FApr 7Apr 2Mar 31Mar 28Mar 25Mar 22Mar 18Mar 14Mar 8
16°FMar 29Mar 25Mar 20Mar 17Mar 14Mar 11Mar 7Mar 2Feb 25

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 19Sep 23Sep 26Sep 28Sep 30Oct 2Oct 5Oct 8Oct 12
32°FSep 29Oct 2Oct 5Oct 8Oct 10Oct 13Oct 16Oct 21Oct 26
28°FOct 8Oct 13Oct 17Oct 21Oct 24Oct 27Oct 30Nov 1Nov 5
24°FOct 19Oct 25Oct 29Nov 1Nov 3Nov 6Nov 9Nov 13Nov 19
20°FNov 2Nov 6Nov 10Nov 13Nov 16Nov 20Nov 24Nov 30Dec 4
16°FNov 12Nov 17Nov 22Nov 27Dec 1Dec 3Dec 7Dec 12Dec 19

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°F160155150146143140136132126
32°F182175171167162159155151144
28°F207200195191186181177172165
24°F233225220216212208203198192
20°F259251245240236231226221213
16°F286278272266261256251245236

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
5,747
Cooling degree days, base 65°F
729
Growing degree days, base 40°F
5,249
Growing degree days, base 45°F
4,054
Growing degree days, base 50°F
3,008
Growing degree days, base 55°F
2,103
Growing degree days, base 60°F
1,341

Growing degree days by month, base 50°F

Heating and cooling by month

MonthHeating DDCooling DDGrowing DD 50
January1,13502
February96602
March808019
April4504107
May18542330
June30153573
July3248710
August11196649
September9678434
October3858151
November686028
December99403

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 2 km from Salunga. 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 USC00364778 (Landisville 2 Nw). Public domain.