Dublin climate

Dublin Frost Dates and Growing Season

NOAA 1991-2020 normals for Sellersville, 9.6 km from Dublin, elevation 302 ft

Frost and the growing season

NOAA's 1991-2020 freeze probabilities for Sellersville. 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 26 and the first fall freeze around October 17, a growing season of about 175 days.

Median at 36°F
last May 6, first October 7
Median at 32°F
last April 26, first October 17
Median at 28°F
last April 13, first October 28

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 23May 18May 13May 10May 6May 3Apr 30Apr 28Apr 23
32°FMay 12May 6May 1Apr 29Apr 26Apr 23Apr 20Apr 17Apr 12
28°FApr 30Apr 24Apr 20Apr 17Apr 13Apr 10Apr 7Apr 3Mar 30
24°FApr 16Apr 10Apr 6Apr 4Apr 1Mar 30Mar 27Mar 22Mar 17
20°FApr 5Mar 31Mar 29Mar 25Mar 21Mar 18Mar 15Mar 10Mar 5
16°FMar 26Mar 21Mar 17Mar 14Mar 10Mar 6Mar 2Feb 26Feb 21

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

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°F173166161157154149145140134
32°F195188183179175171167163156
28°F220213207203198194190184177
24°F244236231226223219214209203
20°F271262256251246241236230222
16°F296289282276271265261255245

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
5,724
Cooling degree days, base 65°F
786
Growing degree days, base 40°F
5,290
Growing degree days, base 45°F
4,099
Growing degree days, base 50°F
3,059
Growing degree days, base 55°F
2,157
Growing degree days, base 60°F
1,396

Growing degree days by month, base 50°F

Heating and cooling by month

MonthHeating DDCooling DDGrowing DD 50
January1,13301
February95901
March823017
April4616106
May19636315
June39147558
July2280742
August7222680
September8386454
October3868152
November671027
December96405

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

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Sources

NOAA NCEI U.S. Climate Normals, 1991-2020, annual and seasonal normals for station USC00367938 (Sellersville). Public domain.