Presque Isle County climate

Presque Isle County Frost Dates and Growing Season

NOAA 1991-2020 normals for Rogers City, 3 km from Presque Isle County, elevation 615 ft

Frost and the growing season

NOAA's 1991-2020 freeze probabilities for Rogers City. 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 10 and the first fall freeze around October 14, a growing season of about 154 days.

Median at 36°F
last May 24, first October 1
Median at 32°F
last May 10, first October 14
Median at 28°F
last April 29, 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°FJun 5Jun 1May 30May 27May 24May 21May 18May 15May 10
32°FMay 24May 21May 16May 14May 10May 8May 5May 1Apr 28
28°FMay 15May 10May 5May 1Apr 29Apr 27Apr 24Apr 20Apr 15
24°FMay 1Apr 26Apr 23Apr 20Apr 17Apr 14Apr 10Apr 7Apr 2
20°FApr 20Apr 15Apr 10Apr 8Apr 5Apr 3Apr 1Mar 29Mar 24
16°FApr 11Apr 6Apr 4Apr 2Mar 31Mar 28Mar 24Mar 20Mar 15

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 17Sep 22Sep 26Sep 29Oct 1Oct 3Oct 6Oct 10Oct 15
32°FSep 30Oct 3Oct 6Oct 10Oct 14Oct 17Oct 20Oct 24Oct 31
28°FOct 11Oct 17Oct 21Oct 25Oct 28Oct 31Nov 3Nov 7Nov 12
24°FOct 27Nov 1Nov 4Nov 8Nov 11Nov 14Nov 17Nov 21Nov 25
20°FNov 8Nov 12Nov 16Nov 19Nov 22Nov 25Nov 29Dec 2Dec 7
16°FNov 15Nov 22Nov 27Nov 30Dec 2Dec 5Dec 10Dec 15Dec 20

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°F150143139135130127123118112
32°F176169164159154151146141135
28°F200194189184180176171165156
24°F227219214210206201197192184
20°F252244239233229226220215208
16°F270264258253248243238232225

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
7,727
Cooling degree days, base 65°F
397
Growing degree days, base 40°F
3,929
Growing degree days, base 45°F
2,958
Growing degree days, base 50°F
2,120
Growing degree days, base 55°F
1,410
Growing degree days, base 60°F
825

Growing degree days by month, base 50°F

Heating and cooling by month

MonthHeating DDCooling DDGrowing DD 50
January1,36200
February1,21700
March1,11402
April739124
May39212150
June12167398
July29147583
August35123553
September18243321
October529582
November83707
December1,17000

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 3 km from Presque Isle County. 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 USC00207094 (Rogers City). Public domain.