Beebe Plain climate

Beebe Plain Frost Dates and Growing Season

NOAA 1991-2020 normals for Newport, 7.4 km from Beebe Plain, elevation 790 ft

Frost and the growing season

NOAA's 1991-2020 freeze probabilities for Newport. 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 14 and the first fall freeze around September 30, a growing season of about 138 days.

Median at 36°F
last May 27, first September 19
Median at 32°F
last May 14, first September 30
Median at 28°F
last May 1, first October 10

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 8Jun 4Jun 1May 30May 27May 24May 21May 18May 13
32°FMay 28May 23May 20May 16May 14May 11May 8May 5May 1
28°FMay 14May 9May 6May 3May 1Apr 29Apr 26Apr 23Apr 20
24°FMay 1Apr 28Apr 25Apr 22Apr 20Apr 18Apr 16Apr 13Apr 9
20°FApr 22Apr 18Apr 16Apr 13Apr 11Apr 9Apr 7Apr 5Apr 1
16°FApr 15Apr 11Apr 8Apr 6Apr 4Apr 2Apr 1Mar 30Mar 25

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 6Sep 11Sep 14Sep 17Sep 19Sep 22Sep 24Sep 27Oct 1
32°FSep 17Sep 22Sep 24Sep 27Sep 30Oct 2Oct 5Oct 8Oct 13
28°FSep 28Oct 2Oct 5Oct 7Oct 10Oct 13Oct 17Oct 22Oct 28
24°FOct 5Oct 10Oct 14Oct 19Oct 23Oct 26Oct 31Nov 2Nov 6
20°FOct 17Oct 23Oct 28Nov 1Nov 3Nov 5Nov 8Nov 13Nov 18
16°FNov 1Nov 4Nov 7Nov 11Nov 13Nov 16Nov 19Nov 22Nov 27

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°F13412712311911611210810497
32°F155150145142138135130126120
28°F180174169164161157153149144
24°F202196192188184180176171165
20°F223217212209205202197191185
16°F239234229225222219215212205

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
8,691
Cooling degree days, base 65°F
264
Growing degree days, base 40°F
3,624
Growing degree days, base 45°F
2,693
Growing degree days, base 50°F
1,880
Growing degree days, base 55°F
1,190
Growing degree days, base 60°F
641

Growing degree days by month, base 50°F

Heating and cooling by month

MonthHeating DDCooling DDGrowing DD 50
January1,59200
February1,37100
March1,21702
April751122
May37110163
June13152373
July37104532
August6374476
September23823256
October614151
November95405
December1,35300

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 7.4 km from Beebe Plain. 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 USC00435542 (Newport). Public domain.