Dundee climate

Dundee Frost Dates and Growing Season

NOAA 1991-2020 normals for Penn Yan AP, 14.8 km from Dundee, elevation 903 ft

Frost and the growing season

NOAA's 1991-2020 freeze probabilities for Penn Yan 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 30 and the first fall freeze around October 22, a growing season of about 173 days.

Median at 36°F
last May 10, first October 7
Median at 32°F
last April 30, first October 22
Median at 28°F
last April 18, first November 3

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 15May 12May 10May 6May 4Apr 30Apr 27
32°FMay 14May 9May 6May 2Apr 30Apr 28Apr 25Apr 21Apr 18
28°FMay 3Apr 29Apr 24Apr 21Apr 18Apr 16Apr 13Apr 10Apr 6
24°FApr 19Apr 15Apr 12Apr 9Apr 6Apr 4Apr 2Mar 31Mar 24
20°FApr 9Apr 5Apr 2Mar 31Mar 29Mar 26Mar 22Mar 19Mar 14
16°FApr 2Mar 30Mar 27Mar 23Mar 20Mar 17Mar 15Mar 11Mar 6

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

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°F169161156153149145141137130
32°F193186181177173168163159152
28°F218211207202198195191185177
24°F242234228224221217213208201
20°F262256251246243238234228222
16°F283275270265261256252246240

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
6,505
Cooling degree days, base 65°F
596
Growing degree days, base 40°F
4,763
Growing degree days, base 45°F
3,649
Growing degree days, base 50°F
2,679
Growing degree days, base 55°F
1,843
Growing degree days, base 60°F
1,142

Growing degree days by month, base 50°F

Heating and cooling by month

MonthHeating DDCooling DDGrowing DD 50
January1,23701
February1,07401
March952013
April578364
May25333268
June59113504
July9213669
August18166614
September12761387
October4227133
November734022
December1,04503

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 14.8 km from Dundee. 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 USW00054778 (Penn Yan AP). Public domain.