Eloy climate

Eloy Frost Dates and Growing Season

NOAA 1991-2020 normals for Eloy 4 Ne, 4.5 km from Eloy, elevation 1545 ft

Frost and the growing season

NOAA's 1991-2020 freeze probabilities for Eloy 4 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 February 24 and the first fall freeze around November 28, a growing season of about 273 days.

Median at 36°F
last March 17, first November 17
Median at 32°F
last February 24, first November 28
Median at 28°F
last February 3, first December 8

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°FApr 11Apr 3Mar 28Mar 21Mar 17Mar 12Mar 7Mar 3Feb 25
32°FMar 18Mar 8Mar 3Feb 28Feb 24Feb 19Feb 14Feb 6Jan 30
28°FFeb 28Feb 21Feb 14Feb 8Feb 3Jan 30Jan 23Jan 15Jan 5
24°FFeb 15Feb 7Feb 1Jan 27Jan 20Jan 12Jan 5Dec 31Dec 19
20°FFeb 6Feb 1Jan 23Jan 14Jan 9Jan 4Dec 31Dec 26Dec 18
16°F–––––––––

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°FOct 30Nov 5Nov 10Nov 13Nov 17Nov 20Nov 23Nov 26Dec 1
32°FNov 11Nov 17Nov 21Nov 25Nov 28Dec 1Dec 4Dec 7Dec 13
28°FNov 23Nov 28Dec 2Dec 5Dec 8Dec 12Dec 17Dec 23Jan 1
24°FDec 1Dec 8Dec 13Dec 19Dec 26Jan 1Jan 7Jan 17Jan 29
20°FDec 15Dec 22Dec 29Jan 1Jan 5Jan 11Jan 19Jan 28Feb 4
16°F–––––––––

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°F268258252245240233227219207
32°F303293286280273267260252239
28°F344332322315308301294286277
24°F365365358351342337330322308
20°F365365365365365365365361344
16°F365365365365365365365365365

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
99% of years
24°F or colder
77% of years
20°F or colder
27% of years
16°F or colder
3% 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
1,432
Cooling degree days, base 65°F
3,632
Growing degree days, base 40°F
11,326
Growing degree days, base 45°F
9,510
Growing degree days, base 50°F
7,759
Growing degree days, base 55°F
6,171
Growing degree days, base 60°F
4,807

Growing degree days by month, base 50°F

Heating and cooling by month

MonthHeating DDCooling DDGrowing DD 50
January3750116
February2732159
March14838357
April37146560
May3373836
June06361,086
July07981,263
August07581,223
September05801,031
October19270716
November16930318
December408096

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 4.5 km from Eloy. 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 USC00022807 (Eloy 4 Ne). Public domain.