Tidioute climate

Tidioute Frost Dates and Growing Season

NOAA 1991-2020 normals for Tionesta 2 Se Lake, 23.1 km from Tidioute, elevation 1200 ft

Frost and the growing season

NOAA's 1991-2020 freeze probabilities for Tionesta 2 Se Lake. 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 May 1 and the first fall freeze around October 25, a growing season of about 176 days.

Median at 36°F
last May 12, first October 12
Median at 32°F
last May 1, first October 25
Median at 28°F
last April 20, first November 4

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 27May 22May 18May 14May 12May 9May 6May 1Apr 28
32°FMay 18May 12May 9May 5May 1Apr 29Apr 26Apr 22Apr 18
28°FMay 6Apr 30Apr 25Apr 22Apr 20Apr 17Apr 13Apr 10Apr 6
24°FApr 19Apr 15Apr 11Apr 8Apr 6Apr 3Apr 1Mar 30Mar 23
20°FApr 10Apr 5Apr 2Mar 31Mar 28Mar 25Mar 21Mar 17Mar 12
16°FMar 31Mar 27Mar 23Mar 20Mar 17Mar 15Mar 11Mar 7Mar 3

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 1Oct 3Oct 6Oct 9Oct 12Oct 15Oct 19Oct 22Oct 27
32°FOct 8Oct 14Oct 18Oct 22Oct 25Oct 28Oct 31Nov 2Nov 6
28°FOct 18Oct 26Oct 30Nov 1Nov 4Nov 7Nov 10Nov 13Nov 18
24°FOct 30Nov 5Nov 9Nov 12Nov 15Nov 18Nov 21Nov 25Dec 1
20°FNov 6Nov 12Nov 17Nov 21Nov 25Nov 29Dec 2Dec 6Dec 14
16°FNov 14Nov 22Nov 28Dec 1Dec 5Dec 10Dec 16Dec 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°F173166161157153150145140134
32°F194188184180176171167162155
28°F219212206202198193188184175
24°F243236230226222218214209199
20°F268258252246242238233227220
16°F288279273268263259254247238

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
6,130
Cooling degree days, base 65°F
669
Growing degree days, base 40°F
5,027
Growing degree days, base 45°F
3,871
Growing degree days, base 50°F
2,858
Growing degree days, base 55°F
1,988
Growing degree days, base 60°F
1,253

Growing degree days by month, base 50°F

Heating and cooling by month

MonthHeating DDCooling DDGrowing DD 50
January1,17802
February1,02901
March889119
April507387
May22845304
June48133536
July8222679
August14187639
September10370420
October3979147
November711022
December1,02003

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 23.1 km from Tidioute. 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 USC00368873 (Tionesta 2 Se Lake). Public domain.