Antwerp climate

Antwerp Frost Dates and Growing Season

NOAA 1991-2020 normals for Woodburn 3N, 9.3 km from Antwerp, elevation 710 ft

Frost and the growing season

NOAA's 1991-2020 freeze probabilities for Woodburn 3N. 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 27 and the first fall freeze around October 19, a growing season of about 174 days.

Median at 36°F
last May 5, first October 7
Median at 32°F
last April 27, first October 19
Median at 28°F
last April 15, first October 30

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 20May 15May 11May 8May 5May 3Apr 30Apr 27Apr 23
32°FMay 11May 6May 3Apr 30Apr 27Apr 24Apr 21Apr 17Apr 13
28°FMay 1Apr 25Apr 20Apr 17Apr 15Apr 12Apr 8Apr 4Mar 31
24°FApr 17Apr 12Apr 8Apr 5Apr 2Mar 31Mar 28Mar 24Mar 20
20°FApr 7Apr 3Mar 31Mar 28Mar 24Mar 21Mar 18Mar 14Mar 7
16°FMar 30Mar 26Mar 22Mar 18Mar 14Mar 11Mar 6Mar 2Feb 24

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 23Sep 28Oct 1Oct 4Oct 7Oct 9Oct 12Oct 15Oct 21
32°FOct 4Oct 9Oct 13Oct 15Oct 19Oct 21Oct 24Oct 27Oct 31
28°FOct 16Oct 21Oct 24Oct 27Oct 30Nov 1Nov 4Nov 6Nov 12
24°FOct 29Nov 1Nov 4Nov 6Nov 9Nov 13Nov 16Nov 20Nov 25
20°FNov 6Nov 10Nov 14Nov 18Nov 21Nov 25Nov 28Dec 2Dec 10
16°FNov 12Nov 19Nov 24Nov 28Dec 1Dec 5Dec 10Dec 16Dec 22

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°F172165160156153149144140132
32°F194187182178174170166160153
28°F218210205201197194190184176
24°F242234229225222218213209202
20°F268261254249244239234228220
16°F291281276270266260254248240

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
6,258
Cooling degree days, base 65°F
770
Growing degree days, base 40°F
5,152
Growing degree days, base 45°F
4,008
Growing degree days, base 50°F
3,005
Growing degree days, base 55°F
2,133
Growing degree days, base 60°F
1,384

Growing degree days by month, base 50°F

Heating and cooling by month

MonthHeating DDCooling DDGrowing DD 50
January1,24601
February1,05701
March874122
April498490
May20243323
June24169595
July5263722
August12195648
September10983427
October40011153
November749021
December1,08303

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 9.3 km from Antwerp. 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 USC00129724 (Woodburn 3N). Public domain.