Dublin climate

Dublin Frost Dates and Growing Season

NOAA 1991-2020 normals for Columbus Ohio State Univ AP, 3.8 km from Dublin, elevation 905 ft

Frost and the growing season

NOAA's 1991-2020 freeze probabilities for Columbus Ohio State Univ AP. 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 22 and the first fall freeze around October 23, a growing season of about 183 days.

Median at 36°F
last May 3, first October 12
Median at 32°F
last April 22, first October 23
Median at 28°F
last April 9, first November 2

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 6May 3Apr 30Apr 27Apr 23Apr 18
32°FMay 9May 3Apr 30Apr 26Apr 22Apr 19Apr 16Apr 12Apr 6
28°FApr 26Apr 19Apr 16Apr 13Apr 9Apr 6Apr 3Mar 31Mar 24
24°FApr 13Apr 7Apr 4Apr 1Mar 30Mar 27Mar 23Mar 19Mar 13
20°FApr 2Mar 30Mar 27Mar 23Mar 20Mar 17Mar 13Mar 8Mar 1
16°FMar 27Mar 22Mar 18Mar 14Mar 10Mar 6Mar 2Feb 25Feb 19

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 28Oct 2Oct 6Oct 10Oct 12Oct 14Oct 17Oct 20Oct 24
32°FOct 9Oct 15Oct 17Oct 20Oct 23Oct 25Oct 28Nov 1Nov 4
28°FOct 20Oct 25Oct 29Oct 31Nov 2Nov 4Nov 7Nov 11Nov 15
24°FNov 1Nov 5Nov 8Nov 11Nov 13Nov 16Nov 19Nov 24Dec 1
20°FNov 8Nov 13Nov 17Nov 21Nov 26Nov 30Dec 3Dec 8Dec 15
16°FNov 18Nov 27Dec 1Dec 4Dec 8Dec 13Dec 17Dec 22Dec 29

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°F181175170165162158154149141
32°F202195190186183179174169163
28°F226218214210206201197192185
24°F252244239234230226221216209
20°F278268261257252247242236230
16°F301292286280276269263256248

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
5,486
Cooling degree days, base 65°F
919
Growing degree days, base 40°F
5,697
Growing degree days, base 45°F
4,463
Growing degree days, base 50°F
3,370
Growing degree days, base 55°F
2,412
Growing degree days, base 60°F
1,592

Growing degree days by month, base 50°F

Heating and cooling by month

MonthHeating DDCooling DDGrowing DD 50
January1,12204
February93807
March759243
April39710151
May15569387
June21193622
July2285749
August5245705
September78100474
October35415182
November675037
December98108

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 3.8 km from Dublin. 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 USW00004804 (Columbus Ohio State Univ AP). Public domain.