Gallipolis climate

Gallipolis Frost Dates and Growing Season

NOAA 1991-2020 normals for Gallipolis, 2.1 km from Gallipolis, elevation 578 ft

Frost and the growing season

NOAA's 1991-2020 freeze probabilities for Gallipolis. 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 28, a growing season of about 192 days.

Median at 36°F
last April 29, first October 18
Median at 32°F
last April 18, first October 28
Median at 28°F
last April 4, first November 5

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 15May 10May 5May 1Apr 29Apr 26Apr 22Apr 19Apr 15
32°FMay 4Apr 28Apr 23Apr 20Apr 18Apr 15Apr 12Apr 7Apr 3
28°FApr 18Apr 15Apr 11Apr 7Apr 4Apr 2Mar 31Mar 28Mar 21
24°FApr 9Apr 3Mar 31Mar 29Mar 25Mar 22Mar 18Mar 13Mar 7
20°FMar 29Mar 24Mar 20Mar 17Mar 13Mar 9Mar 4Feb 28Feb 20
16°FMar 20Mar 15Mar 9Mar 5Feb 28Feb 25Feb 20Feb 13Feb 5

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 5Oct 9Oct 13Oct 16Oct 18Oct 20Oct 23Oct 25Oct 29
32°FOct 15Oct 20Oct 23Oct 26Oct 28Oct 30Nov 1Nov 3Nov 8
28°FOct 26Oct 31Nov 1Nov 3Nov 5Nov 9Nov 11Nov 15Nov 21
24°FNov 3Nov 6Nov 10Nov 13Nov 16Nov 19Nov 23Nov 28Dec 3
20°FNov 12Nov 17Nov 22Nov 26Dec 1Dec 3Dec 7Dec 13Dec 21
16°FNov 23Dec 1Dec 6Dec 10Dec 15Dec 21Dec 26Jan 1Jan 7

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°F189183179176173168164160152
32°F212205201196192188184179172
28°F236228224219215211207203197
24°F263254247243238233228224218
20°F291281275269263257252245236
16°F318309301295289284278271260

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
4,793
Cooling degree days, base 65°F
1,148
Growing degree days, base 40°F
6,291
Growing degree days, base 45°F
4,972
Growing degree days, base 50°F
3,803
Growing degree days, base 55°F
2,774
Growing degree days, base 60°F
1,889

Growing degree days by month, base 50°F

Heating and cooling by month

MonthHeating DDCooling DDGrowing DD 50
January1,02107
February830010
March670257
April33315196
May12384431
June13227664
July0340804
August2307770
September48150552
October28323239
November596158
December874014

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 2.1 km from Gallipolis. 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 USC00333029 (Gallipolis). Public domain.