Weston climate

Weston Frost Dates and Growing Season

NOAA 1991-2020 normals for Hoytville 2 Ne, 14.5 km from Weston, elevation 700 ft

Frost and the growing season

NOAA's 1991-2020 freeze probabilities for Hoytville 2 Ne. 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 24 and the first fall freeze around October 21, a growing season of about 179 days.

Median at 36°F
last May 3, first October 8
Median at 32°F
last April 24, first October 21
Median at 28°F
last April 14, first November 1

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 10May 6May 3May 1Apr 29Apr 24Apr 20
32°FMay 10May 4Apr 30Apr 28Apr 24Apr 22Apr 19Apr 16Apr 11
28°FApr 29Apr 23Apr 20Apr 17Apr 14Apr 11Apr 7Apr 3Mar 31
24°FApr 17Apr 12Apr 7Apr 4Apr 1Mar 30Mar 27Mar 22Mar 17
20°FApr 5Apr 1Mar 29Mar 26Mar 22Mar 19Mar 16Mar 12Mar 6
16°FMar 30Mar 25Mar 20Mar 17Mar 13Mar 10Mar 6Mar 1Feb 23

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 2Oct 5Oct 8Oct 11Oct 14Oct 18Oct 23
32°FOct 4Oct 10Oct 15Oct 18Oct 21Oct 25Oct 28Nov 1Nov 5
28°FOct 20Oct 25Oct 27Oct 31Nov 1Nov 4Nov 7Nov 11Nov 15
24°FOct 31Nov 2Nov 6Nov 9Nov 12Nov 15Nov 18Nov 23Nov 29
20°FNov 7Nov 12Nov 16Nov 20Nov 24Nov 28Dec 1Dec 5Dec 13
16°FNov 15Nov 22Nov 27Dec 1Dec 4Dec 8Dec 13Dec 18Dec 24

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°F176170164160157152148144138
32°F198192188184179175171166159
28°F221215210205201197193189183
24°F245238233228224220215209202
20°F271262255250245242236231225
16°F293284277271267262256250242

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
6,002
Cooling degree days, base 65°F
875
Growing degree days, base 40°F
5,401
Growing degree days, base 45°F
4,229
Growing degree days, base 50°F
3,199
Growing degree days, base 55°F
2,292
Growing degree days, base 60°F
1,514

Growing degree days by month, base 50°F

Heating and cooling by month

MonthHeating DDCooling DDGrowing DD 50
January1,21602
February1,02202
March846230
April47610114
May18365358
June30204624
July4272733
August11214668
September9394454
October37115176
November711033
December1,03805

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 14.5 km from Weston. 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 USC00333874 (Hoytville 2 Ne). Public domain.