Panacea climate

Panacea Frost Dates and Growing Season

NOAA 1991-2020 normals for Panacea 1 S, 10.3 km from Panacea, elevation 6 ft

Frost and the growing season

NOAA's 1991-2020 freeze probabilities for Panacea 1 S. 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 March 8 and the first fall freeze around November 22, a growing season of about 262 days.

Median at 36°F
last March 21, first November 12
Median at 32°F
last March 8, first November 22
Median at 28°F
last February 26, first December 11

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°FApr 6Mar 31Mar 28Mar 24Mar 21Mar 17Mar 13Mar 8Mar 1
32°FMar 26Mar 21Mar 17Mar 13Mar 8Mar 5Mar 1Feb 24Feb 15
28°FMar 19Mar 11Mar 6Mar 1Feb 26Feb 20Feb 14Feb 5Jan 27
24°FMar 8Mar 1Feb 22Feb 14Feb 7Feb 1Jan 26Jan 19Jan 3
20°FFeb 27Feb 14Feb 6Feb 1Jan 29Jan 21Jan 14Jan 8Dec 31
16°FFeb 21Feb 6Feb 2Jan 31Jan 25Jan 16Jan 12Jan 8Jan 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°FOct 30Nov 3Nov 5Nov 8Nov 12Nov 15Nov 18Nov 23Dec 1
32°FNov 6Nov 11Nov 15Nov 19Nov 22Nov 27Dec 1Dec 7Dec 20
28°FNov 15Nov 23Dec 1Dec 4Dec 11Dec 19Dec 28Jan 4Jan 14
24°FDec 2Dec 10Dec 19Dec 27Jan 1Jan 6Jan 12Jan 21Feb 4
20°FDec 17Dec 29Jan 2Jan 7Jan 12Jan 16Jan 24Feb 1Feb 13
16°FDec 31Jan 6Jan 10Jan 14Jan 19Jan 26Feb 1Feb 4Feb 17

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°F263254247242237232227221213
32°F293281273268262257251245236
28°F330316305296289282274267257
24°F365351339331324315307299286
20°F365365365365360348337327312
16°F365365365365365365365365342

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
99% of years
24°F or colder
88% of years
20°F or colder
55% of years
16°F or colder
19% 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
1,499
Cooling degree days, base 65°F
2,552
Growing degree days, base 40°F
10,200
Growing degree days, base 45°F
8,425
Growing degree days, base 50°F
6,732
Growing degree days, base 55°F
5,172
Growing degree days, base 60°F
3,770

Growing degree days by month, base 50°F

Heating and cooling by month

MonthHeating DDCooling DDGrowing DD 50
January4175145
February2947168
March16935339
April46116521
May5281741
June0437886
July0524989
August0521986
September0392841
October34190622
November18031311
December35314185

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 10.3 km from Panacea. 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 USC00086828 (Panacea 1 S). Public domain.