Chandler climate

Chandler Frost Dates and Growing Season

NOAA 1991-2020 normals for Tyler Pounds Fld, 8.9 km from Chandler, elevation 544 ft

Frost and the growing season

NOAA's 1991-2020 freeze probabilities for Tyler Pounds Fld. 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 March 8 and the first fall freeze around November 22, a growing season of about 258 days.

Median at 36°F
last March 24, first November 11
Median at 32°F
last March 8, first November 22
Median at 28°F
last February 21, first December 6

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 14Apr 6Apr 1Mar 29Mar 24Mar 19Mar 14Mar 9Mar 2
32°FMar 29Mar 23Mar 17Mar 12Mar 8Mar 4Feb 28Feb 22Feb 16
28°FMar 15Mar 9Mar 4Feb 27Feb 21Feb 16Feb 9Feb 1Jan 26
24°FMar 4Feb 24Feb 13Feb 7Feb 1Jan 27Jan 20Jan 14Dec 31
20°FFeb 19Feb 6Jan 31Jan 23Jan 17Jan 11Jan 6Dec 31Dec 23
16°FFeb 5Jan 26Jan 20Jan 15Jan 10Jan 6Jan 5Jan 1Dec 26

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 29Nov 2Nov 5Nov 8Nov 11Nov 14Nov 17Nov 21Nov 26
32°FNov 6Nov 12Nov 15Nov 18Nov 22Nov 26Nov 30Dec 4Dec 9
28°FNov 16Nov 23Nov 28Dec 1Dec 6Dec 9Dec 16Dec 23Jan 1
24°FNov 27Dec 7Dec 13Dec 20Dec 25Jan 1Jan 4Jan 13Jan 27
20°FDec 15Dec 23Dec 29Jan 1Jan 5Jan 10Jan 16Jan 25Feb 5
16°FDec 22Dec 31Jan 1Jan 5Jan 7Jan 10Jan 16Jan 20Feb 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°F259250244238232227222216207
32°F285277270264258252247241231
28°F326312303295290283277270260
24°F365350341334328319311301288
20°F365365365365361352343334319
16°F365365365365365365365365351

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
90% of years
20°F or colder
55% of years
16°F or colder
18% 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
2,072
Cooling degree days, base 65°F
2,685
Growing degree days, base 40°F
9,817
Growing degree days, base 45°F
8,121
Growing degree days, base 50°F
6,544
Growing degree days, base 55°F
5,103
Growing degree days, base 60°F
3,813

Growing degree days by month, base 50°F

Heating and cooling by month

MonthHeating DDCooling DDGrowing DD 50
January543592
February38611139
March22739303
April79100474
May9278735
June0472922
July06011,066
August06001,065
September2392840
October66150550
November26628250
December4959110

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 8.9 km from Chandler. 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 USW00013972 (Tyler Pounds Fld). Public domain.