Belgium climate

Belgium Frost Dates and Growing Season

NOAA 1991-2020 normals for Belgium Wwtp, 1.5 km from Belgium, elevation 731 ft

Frost and the growing season

NOAA's 1991-2020 freeze probabilities for Belgium Wwtp. 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 5 and the first fall freeze around October 12, a growing season of about 159 days.

Median at 36°F
last May 19, first October 1
Median at 32°F
last May 5, first October 12
Median at 28°F
last April 22, first October 25

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

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

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°F156150145140136132128124117
32°F182174169164159156151146138
28°F204198192188184179174169161
24°F231223218213209205201196187
20°F252245240235230226222216208
16°F269263257253249244240234228

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
7,603
Cooling degree days, base 65°F
390
Growing degree days, base 40°F
4,082
Growing degree days, base 45°F
3,073
Growing degree days, base 50°F
2,199
Growing degree days, base 55°F
1,448
Growing degree days, base 60°F
840

Growing degree days by month, base 50°F

Heating and cooling by month

MonthHeating DDCooling DDGrowing DD 50
January1,42100
February1,20300
March1,03507
April675021
May3655158
June9961414
July21160604
August25126565
September16036331
October503290
November864010
December1,23200

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 1.5 km from Belgium. 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 USC00470652 (Belgium Wwtp). Public domain.