LeRoy climate

LeRoy Frost Dates and Growing Season

NOAA 1991-2020 normals for Yates Ctr, 23.8 km from LeRoy, elevation 1112 ft

Frost and the growing season

NOAA's 1991-2020 freeze probabilities for Yates Ctr. 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 10 and the first fall freeze around October 28, a growing season of about 198 days.

Median at 36°F
last April 20, first October 19
Median at 32°F
last April 10, first October 28
Median at 28°F
last April 1, first November 6

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 4Apr 30Apr 27Apr 23Apr 20Apr 17Apr 14Apr 10Apr 6
32°FApr 26Apr 20Apr 17Apr 13Apr 10Apr 7Apr 5Apr 1Mar 26
28°FApr 15Apr 10Apr 7Apr 4Apr 1Mar 30Mar 25Mar 21Mar 15
24°FApr 8Apr 3Mar 30Mar 25Mar 22Mar 17Mar 13Mar 8Mar 2
20°FApr 1Mar 23Mar 18Mar 14Mar 10Mar 6Mar 2Feb 27Feb 21
16°FMar 22Mar 14Mar 9Mar 4Mar 1Feb 27Feb 22Feb 17Feb 10

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 2Oct 9Oct 13Oct 16Oct 19Oct 21Oct 23Oct 26Oct 30
32°FOct 13Oct 20Oct 23Oct 25Oct 28Oct 30Nov 2Nov 5Nov 9
28°FOct 23Oct 28Nov 1Nov 3Nov 6Nov 9Nov 11Nov 15Nov 22
24°FNov 1Nov 5Nov 8Nov 11Nov 15Nov 18Nov 22Nov 26Dec 1
20°FNov 7Nov 12Nov 16Nov 21Nov 24Nov 28Dec 1Dec 5Dec 11
16°FNov 15Nov 22Nov 26Nov 30Dec 4Dec 8Dec 13Dec 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°F200193187183179175171166159
32°F221213207202198195190185178
28°F240234228222217213209204197
24°F262253246242237233227221213
20°F283274268262257252245239229
16°F303294288282276271265259247

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
4,726
Cooling degree days, base 65°F
1,430
Growing degree days, base 40°F
6,696
Growing degree days, base 45°F
5,365
Growing degree days, base 50°F
4,175
Growing degree days, base 55°F
3,121
Growing degree days, base 60°F
2,207

Growing degree days by month, base 50°F

Heating and cooling by month

MonthHeating DDCooling DDGrowing DD 50
January1,04504
February818014
March616374
April31315206
May10096463
June5283727
July0428893
August1390854
September44181587
October25835278
November591267
December93509

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 23.8 km from LeRoy. 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 USC00149080 (Yates Ctr). Public domain.