Bellaire climate

Bellaire Frost Dates and Growing Season

NOAA 1991-2020 normals for E Jordan, 20.1 km from Bellaire, elevation 587 ft

Frost and the growing season

NOAA's 1991-2020 freeze probabilities for E Jordan. 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 23 and the first fall freeze around October 2, a growing season of about 131 days.

Median at 36°F
last June 4, first September 18
Median at 32°F
last May 23, first October 2
Median at 28°F
last May 8, first October 16

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 25Jun 16Jun 11Jun 8Jun 4Jun 1May 29May 26May 21
32°FJun 6May 31May 28May 26May 23May 20May 16May 12May 5
28°FMay 23May 19May 15May 12May 8May 4May 1Apr 28Apr 23
24°FMay 11May 5May 1Apr 28Apr 25Apr 22Apr 19Apr 15Apr 10
20°FApr 26Apr 22Apr 18Apr 15Apr 12Apr 9Apr 6Apr 4Mar 30
16°FApr 17Apr 12Apr 9Apr 6Apr 3Apr 1Mar 30Mar 26Mar 20

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°FAug 29Sep 4Sep 10Sep 15Sep 18Sep 21Sep 24Sep 29Oct 3
32°FSep 17Sep 21Sep 25Sep 29Oct 2Oct 5Oct 8Oct 11Oct 17
28°FSep 30Oct 5Oct 10Oct 13Oct 16Oct 21Oct 25Oct 30Nov 3
24°FOct 13Oct 21Oct 26Oct 30Nov 2Nov 4Nov 7Nov 11Nov 15
20°FOct 29Nov 3Nov 7Nov 10Nov 14Nov 17Nov 21Nov 25Dec 1
16°FNov 8Nov 14Nov 19Nov 23Nov 28Dec 1Dec 5Dec 10Dec 16

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°F126120114109104100948776
32°F154145139135131127123117110
28°F183173168163158153149143134
24°F209201196191187183178171163
20°F237228221216212208202197189
16°F259252246241236231226220211

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
7,202
Cooling degree days, base 65°F
436
Growing degree days, base 40°F
4,216
Growing degree days, base 45°F
3,183
Growing degree days, base 50°F
2,288
Growing degree days, base 55°F
1,524
Growing degree days, base 60°F
897

Growing degree days by month, base 50°F

Heating and cooling by month

MonthHeating DDCooling DDGrowing DD 50
January1,31000
February1,16100
March1,023010
April644246
May31627223
June9191452
July30151586
August42115538
September17744327
October490596
November798010
December1,12101

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 20.1 km from Bellaire. 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 USC00202381 (E Jordan). Public domain.