Weare climate

Weare Frost Dates and Growing Season

NOAA 1991-2020 normals for Weare 2 Ne, 2.2 km from Weare, elevation 805 ft

Frost and the growing season

NOAA's 1991-2020 freeze probabilities for Weare 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 May 9 and the first fall freeze around October 5, a growing season of about 148 days.

Median at 36°F
last May 21, first September 26
Median at 32°F
last May 9, first October 5
Median at 28°F
last April 29, first October 13

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 5Jun 1May 28May 25May 21May 19May 16May 12May 7
32°FMay 23May 19May 15May 12May 9May 7May 4May 1Apr 27
28°FMay 13May 7May 3May 1Apr 29Apr 27Apr 24Apr 21Apr 18
24°FApr 30Apr 25Apr 22Apr 19Apr 17Apr 15Apr 12Apr 8Apr 5
20°FApr 18Apr 14Apr 9Apr 6Apr 4Apr 3Apr 1Mar 30Mar 23
16°FApr 6Apr 3Apr 1Mar 31Mar 28Mar 24Mar 20Mar 17Mar 12

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 15Sep 19Sep 22Sep 23Sep 26Sep 28Oct 1Oct 3Oct 6
32°FSep 25Sep 28Oct 1Oct 2Oct 5Oct 6Oct 9Oct 12Oct 17
28°FOct 2Oct 5Oct 8Oct 11Oct 13Oct 16Oct 19Oct 23Oct 29
24°FOct 11Oct 15Oct 18Oct 21Oct 25Oct 27Oct 31Nov 4Nov 8
20°FOct 20Oct 26Oct 31Nov 2Nov 5Nov 8Nov 12Nov 16Nov 21
16°FNov 3Nov 7Nov 12Nov 15Nov 18Nov 22Nov 25Nov 29Dec 4

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°F144138134130127123119114108
32°F164159155151148144141137130
28°F186179175170166163160157151
24°F211204199195191187183178171
20°F235228223219215211207202196
16°F258250245241237233228224217

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
7,174
Cooling degree days, base 65°F
563
Growing degree days, base 40°F
4,447
Growing degree days, base 45°F
3,413
Growing degree days, base 50°F
2,507
Growing degree days, base 55°F
1,729
Growing degree days, base 60°F
1,081

Growing degree days by month, base 50°F

Heating and cooling by month

MonthHeating DDCooling DDGrowing DD 50
January1,36100
February1,16300
March1,02502
April621148
May28221233
June6998480
July11204658
August16167617
September14769376
October504280
November818012
December1,15900

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 2.2 km from Weare. 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 USC00278973 (Weare 2 Ne). Public domain.