Bremen climate

Bremen Frost Dates and Growing Season

NOAA 1991-2020 normals for Lakeville, 13.5 km from Bremen, elevation 841 ft

Frost and the growing season

NOAA's 1991-2020 freeze probabilities for Lakeville. 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 13, a growing season of about 163 days.

Median at 36°F
last May 12, first October 2
Median at 32°F
last May 1, first October 13
Median at 28°F
last April 21, first October 26

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 19May 15May 12May 8May 6May 2Apr 28
32°FMay 18May 11May 7May 4May 1Apr 29Apr 26Apr 22Apr 18
28°FMay 7Apr 30Apr 27Apr 23Apr 21Apr 18Apr 15Apr 10Apr 4
24°FApr 23Apr 17Apr 14Apr 9Apr 6Apr 3Apr 2Mar 30Mar 24
20°FApr 13Apr 5Apr 3Mar 31Mar 29Mar 26Mar 23Mar 18Mar 12
16°FApr 1Mar 29Mar 24Mar 20Mar 17Mar 14Mar 10Mar 6Mar 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°FSep 20Sep 24Sep 27Sep 30Oct 2Oct 5Oct 7Oct 11Oct 15
32°FSep 30Oct 4Oct 7Oct 10Oct 13Oct 17Oct 20Oct 24Oct 28
28°FOct 11Oct 17Oct 21Oct 24Oct 26Oct 29Nov 1Nov 3Nov 7
24°FOct 25Oct 31Nov 1Nov 4Nov 6Nov 9Nov 12Nov 16Nov 24
20°FNov 5Nov 8Nov 11Nov 14Nov 18Nov 22Nov 26Dec 1Dec 6
16°FNov 12Nov 17Nov 22Nov 26Nov 29Dec 1Dec 6Dec 11Dec 19

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°F161153148144141137133128122
32°F183177171167163159155150142
28°F205200195190187183180174167
24°F233226220216213209204200193
20°F258250244240235231226221214
16°F283273267262257252246240233

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
6,581
Cooling degree days, base 65°F
620
Growing degree days, base 40°F
4,842
Growing degree days, base 45°F
3,735
Growing degree days, base 50°F
2,755
Growing degree days, base 55°F
1,905
Growing degree days, base 60°F
1,187

Growing degree days by month, base 50°F

Heating and cooling by month

MonthHeating DDCooling DDGrowing DD 50
January1,29700
February1,09101
March900120
April526486
May23442296
June46139543
July10207662
August21155600
September12964390
October4318136
November782019
December1,11602

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 13.5 km from Bremen. 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 USC00124782 (Lakeville). Public domain.