Greasewood climate

Greasewood Frost Dates and Growing Season

NOAA 1991-2020 normals for Ganado, 34.3 km from Greasewood, elevation 6340 ft

Frost and the growing season

NOAA's 1991-2020 freeze probabilities for Ganado. 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 15 and the first fall freeze around October 10, a growing season of about 147 days.

Median at 36°F
last May 29, first October 1
Median at 32°F
last May 15, first October 10
Median at 28°F
last May 2, first October 19

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 14Jun 8Jun 4Jun 1May 29May 25May 22May 18May 12
32°FJun 1May 27May 23May 19May 15May 12May 8May 4Apr 30
28°FMay 21May 15May 9May 5May 2Apr 30Apr 27Apr 23Apr 18
24°FMay 7May 1Apr 28Apr 25Apr 21Apr 17Apr 13Apr 9Apr 4
20°FApr 26Apr 18Apr 12Apr 8Apr 4Mar 31Mar 23Mar 18Mar 13
16°FApr 8Mar 30Mar 19Mar 14Mar 10Mar 7Mar 3Feb 28Feb 22

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 21Sep 24Sep 26Sep 29Oct 1Oct 3Oct 6Oct 10Oct 15
32°FSep 28Oct 1Oct 4Oct 7Oct 10Oct 13Oct 16Oct 19Oct 24
28°FOct 4Oct 8Oct 12Oct 16Oct 19Oct 22Oct 26Oct 30Nov 3
24°FOct 13Oct 18Oct 22Oct 25Oct 29Nov 1Nov 4Nov 6Nov 11
20°FOct 20Oct 26Oct 31Nov 3Nov 5Nov 9Nov 12Nov 16Nov 21
16°FOct 28Nov 3Nov 8Nov 13Nov 16Nov 19Nov 22Nov 26Dec 1

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°F146140134130126122118113106
32°F167160155150147143139133124
28°F188180175171167163159154148
24°F212204198193188183178173167
20°F242232225219214208202195185
16°F273264258252246240233225215

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
5,723
Cooling degree days, base 65°F
597
Growing degree days, base 40°F
4,919
Growing degree days, base 45°F
3,725
Growing degree days, base 50°F
2,719
Growing degree days, base 55°F
1,865
Growing degree days, base 60°F
1,157

Growing degree days by month, base 50°F

Heating and cooling by month

MonthHeating DDCooling DDGrowing DD 50
January1,05400
February84600
March705010
April509056
May2678228
June43100507
July2238700
August5196656
September7555432
October4131120
November75309
December1,05200

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 34.3 km from Greasewood. 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 USC00023303 (Ganado). Public domain.