Tyrone climate

Tyrone Frost Dates and Growing Season

NOAA 1991-2020 normals for Philipsburg 2 S, 22.5 km from Tyrone, elevation 1720 ft

Frost and the growing season

NOAA's 1991-2020 freeze probabilities for Philipsburg 2 S. 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 13 and the first fall freeze around October 1, a growing season of about 142 days.

Median at 36°F
last May 27, first September 22
Median at 32°F
last May 13, first October 1
Median at 28°F
last April 30, first October 16

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°FJun 13Jun 6Jun 2May 31May 27May 24May 20May 16May 8
32°FMay 29May 24May 21May 17May 13May 8May 4Apr 30Apr 25
28°FMay 20May 13May 8May 4Apr 30Apr 27Apr 23Apr 19Apr 16
24°FMay 8May 1Apr 26Apr 22Apr 19Apr 16Apr 13Apr 8Apr 4
20°FApr 21Apr 15Apr 12Apr 8Apr 5Apr 2Mar 31Mar 27Mar 21
16°FApr 7Apr 3Mar 31Mar 29Mar 27Mar 24Mar 20Mar 16Mar 12

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

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°F14113412812311811410910395
32°F167159153148142138134128120
28°F192184179173169164158152144
24°F218210205199194189184178170
20°F242235229225221216211206198
16°F269259253248243238234229222

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
7,031
Cooling degree days, base 65°F
357
Growing degree days, base 40°F
4,231
Growing degree days, base 45°F
3,163
Growing degree days, base 50°F
2,232
Growing degree days, base 55°F
1,442
Growing degree days, base 60°F
811

Growing degree days by month, base 50°F

Heating and cooling by month

MonthHeating DDCooling DDGrowing DD 50
January1,27701
February1,09901
March980011
April581367
May29420229
June9670427
July30132567
August4696515
September18532306
October512390
November809014
December1,12404

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 22.5 km from Tyrone. 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 USC00366921 (Philipsburg 2 S). Public domain.