Beulah climate

Beulah Frost Dates and Growing Season

NOAA 1991-2020 normals for Beulah 1 W, 1 km from Beulah, elevation 1785 ft

Frost and the growing season

NOAA's 1991-2020 freeze probabilities for Beulah 1 W. 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 21 and the first fall freeze around September 20, a growing season of about 121 days.

Median at 36°F
last May 31, first September 10
Median at 32°F
last May 21, first September 20
Median at 28°F
last May 11, first September 28

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 17Jun 9Jun 5Jun 2May 31May 28May 25May 22May 18
32°FJun 3May 30May 26May 24May 21May 18May 15May 12May 7
28°FMay 25May 20May 16May 13May 11May 7May 4May 1Apr 27
24°FMay 15May 10May 6May 3Apr 30Apr 28Apr 24Apr 19Apr 14
20°FMay 5Apr 30Apr 26Apr 23Apr 19Apr 16Apr 13Apr 10Apr 6
16°FApr 26Apr 20Apr 17Apr 14Apr 11Apr 8Apr 5Apr 2Mar 27

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 24Aug 31Sep 4Sep 7Sep 10Sep 13Sep 15Sep 19Sep 23
32°FSep 5Sep 10Sep 14Sep 17Sep 20Sep 22Sep 25Sep 29Oct 4
28°FSep 14Sep 19Sep 22Sep 25Sep 28Oct 1Oct 4Oct 8Oct 14
24°FSep 22Sep 27Oct 1Oct 5Oct 8Oct 12Oct 16Oct 21Oct 28
20°FOct 1Oct 7Oct 12Oct 16Oct 20Oct 24Oct 27Oct 30Nov 3
16°FOct 10Oct 17Oct 22Oct 26Oct 29Nov 1Nov 3Nov 6Nov 10

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°F12111410910510096918474
32°F14113312912512111611210799
28°F163155150145142137133127120
24°F184175170166161156151146138
20°F202195190186182176172166158
16°F221213208203199195190184177

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
8,446
Cooling degree days, base 65°F
529
Growing degree days, base 40°F
4,179
Growing degree days, base 45°F
3,201
Growing degree days, base 50°F
2,338
Growing degree days, base 55°F
1,595
Growing degree days, base 60°F
985

Growing degree days by month, base 50°F

Heating and cooling by month

MonthHeating DDCooling DDGrowing DD 50
January1,61000
February1,31600
March1,07104
April640148
May32316209
June9875429
July27201638
August36186616
September19149324
October609367
November1,06803
December1,45800

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 km from Beulah. Low ground, valleys and open fields freeze earlier and later than a town center or a hillside.

More

Sources

NOAA NCEI U.S. Climate Normals, 1991-2020, annual and seasonal normals for station USC00320766 (Beulah 1 W). Public domain.