Man climate

Man Frost Dates and Growing Season

NOAA 1991-2020 normals for Rd Bailey Lake, 16.6 km from Man, elevation 1277 ft

Frost and the growing season

NOAA's 1991-2020 freeze probabilities for Rd Bailey 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 April 15 and the first fall freeze around October 27, a growing season of about 194 days.

Median at 36°F
last April 29, first October 18
Median at 32°F
last April 15, first October 27
Median at 28°F
last April 1, first November 5

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 16May 10May 6May 2Apr 29Apr 25Apr 21Apr 18Apr 14
32°FMay 4Apr 25Apr 20Apr 17Apr 15Apr 12Apr 9Apr 5Apr 1
28°FApr 14Apr 9Apr 6Apr 3Apr 1Mar 30Mar 27Mar 22Mar 17
24°FApr 2Mar 31Mar 27Mar 23Mar 19Mar 17Mar 14Mar 10Mar 4
20°FMar 25Mar 20Mar 16Mar 13Mar 9Mar 6Mar 2Feb 26Feb 17
16°FMar 17Mar 12Mar 7Mar 4Feb 28Feb 24Feb 16Feb 8Feb 1

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 6Oct 10Oct 13Oct 16Oct 18Oct 20Oct 23Oct 25Oct 29
32°FOct 13Oct 19Oct 22Oct 24Oct 27Oct 29Oct 31Nov 3Nov 6
28°FOct 24Oct 28Oct 31Nov 2Nov 5Nov 7Nov 10Nov 13Nov 18
24°FNov 2Nov 6Nov 9Nov 12Nov 15Nov 18Nov 21Nov 25Nov 30
20°FNov 10Nov 15Nov 19Nov 23Nov 27Dec 1Dec 4Dec 10Dec 20
16°FNov 19Nov 27Dec 1Dec 6Dec 12Dec 19Dec 25Dec 30Jan 6

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°F191185180177173169165160153
32°F211206202197194190186181175
28°F237230226221217213210206201
24°F261253248244240236231226219
20°F291282274269264258252248240
16°F322309302296289284277269259

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
4,787
Cooling degree days, base 65°F
890
Growing degree days, base 40°F
5,978
Growing degree days, base 45°F
4,655
Growing degree days, base 50°F
3,492
Growing degree days, base 55°F
2,475
Growing degree days, base 60°F
1,601

Growing degree days by month, base 50°F

Heating and cooling by month

MonthHeating DDCooling DDGrowing DD 50
January98306
February802011
March660156
April32311197
May12761405
June16179613
July4276738
August3243705
September54107503
October31512207
November624038
December879012

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 16.6 km from Man. 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 USC00467372 (Rd Bailey Lake). Public domain.