Hamburg climate

Hamburg Frost Dates and Growing Season

NOAA 1991-2020 normals for Crossett 2 Sse, 19.1 km from Hamburg, elevation 180 ft

Frost and the growing season

NOAA's 1991-2020 freeze probabilities for Crossett 2 Sse. 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 March 18 and the first fall freeze around November 11, a growing season of about 238 days.

Median at 36°F
last April 2, first November 1
Median at 32°F
last March 18, first November 11
Median at 28°F
last March 3, first November 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°FApr 19Apr 13Apr 8Apr 5Apr 2Mar 30Mar 26Mar 21Mar 14
32°FApr 6Mar 31Mar 27Mar 23Mar 18Mar 15Mar 9Mar 3Feb 26
28°FMar 25Mar 17Mar 12Mar 8Mar 3Feb 28Feb 24Feb 17Feb 7
24°FMar 10Mar 3Feb 27Feb 20Feb 14Feb 9Feb 2Jan 29Jan 16
20°FFeb 28Feb 16Feb 8Feb 1Jan 30Jan 23Jan 16Jan 9Dec 30
16°FFeb 15Feb 5Jan 30Jan 24Jan 19Jan 14Jan 9Jan 4Dec 29

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 18Oct 22Oct 26Oct 29Nov 1Nov 3Nov 6Nov 11Nov 17
32°FOct 28Nov 1Nov 4Nov 7Nov 11Nov 16Nov 20Nov 25Dec 1
28°FNov 4Nov 11Nov 16Nov 21Nov 26Nov 30Dec 3Dec 8Dec 19
24°FNov 16Nov 24Nov 30Dec 5Dec 11Dec 19Dec 27Jan 2Jan 11
20°FNov 28Dec 8Dec 20Dec 26Jan 1Jan 3Jan 9Jan 16Feb 1
16°FDec 16Dec 29Jan 1Jan 4Jan 8Jan 12Jan 17Jan 23Feb 4

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°F237229223218213208203198190
32°F265256250245238233227221211
28°F299287279273267261255248239
24°F337327317307300294286277266
20°F365363352342335329322310298
16°F365365365365365363351340328

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
98% of years
20°F or colder
81% of years
16°F or colder
42% 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
2,414
Cooling degree days, base 65°F
2,494
Growing degree days, base 40°F
9,320
Growing degree days, base 45°F
7,667
Growing degree days, base 50°F
6,147
Growing degree days, base 55°F
4,773
Growing degree days, base 60°F
3,550

Growing degree days by month, base 50°F

Heating and cooling by month

MonthHeating DDCooling DDGrowing DD 50
January605470
February4507101
March27828256
April10893439
May16258707
June0456906
July05721,037
August05551,020
September5367811
October95126500
November31922207
December538794

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 19.1 km from Hamburg. 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 USC00031730 (Crossett 2 Sse). Public domain.