Granger climate

Granger Frost Dates and Growing Season

NOAA 1991-2020 normals for Sunnyside #2, 12.1 km from Granger, elevation 805 ft

Frost and the growing season

NOAA's 1991-2020 freeze probabilities for Sunnyside #2. 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 30 and the first fall freeze around October 8, a growing season of about 160 days.

Median at 36°F
last May 15, first September 26
Median at 32°F
last April 30, first October 8
Median at 28°F
last April 15, first October 22

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 1May 25May 21May 18May 15May 12May 9May 7May 2
32°FMay 13May 9May 5May 3Apr 30Apr 28Apr 26Apr 23Apr 19
28°FMay 1Apr 27Apr 23Apr 19Apr 15Apr 12Apr 8Apr 4Mar 30
24°FApr 15Apr 7Apr 2Mar 30Mar 26Mar 21Mar 17Mar 11Mar 5
20°FMar 27Mar 18Mar 12Mar 7Mar 3Feb 28Feb 24Feb 19Feb 8
16°FMar 6Feb 28Feb 25Feb 21Feb 16Feb 9Feb 1Jan 18Jan 5

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 11Sep 16Sep 20Sep 23Sep 26Sep 29Oct 1Oct 5Oct 9
32°FSep 26Sep 30Oct 3Oct 5Oct 8Oct 11Oct 14Oct 18Oct 22
28°FOct 6Oct 12Oct 16Oct 19Oct 22Oct 25Oct 27Nov 1Nov 6
24°FOct 19Oct 23Oct 27Oct 30Nov 1Nov 6Nov 10Nov 14Nov 21
20°FOct 27Nov 1Nov 7Nov 11Nov 16Nov 20Nov 25Dec 1Dec 8
16°FNov 5Nov 14Nov 21Nov 25Nov 30Dec 5Dec 12Dec 21Jan 3

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°F153146142137133129124118110
32°F182173168164160156152147141
28°F211204199194190185181174166
24°F251241235228222218212207199
20°F291278270264257251244237228
16°F334320311301294285277268257

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
98% 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
5,831
Cooling degree days, base 65°F
463
Growing degree days, base 40°F
4,689
Growing degree days, base 45°F
3,459
Growing degree days, base 50°F
2,437
Growing degree days, base 55°F
1,605
Growing degree days, base 60°F
945

Growing degree days by month, base 50°F

Heating and cooling by month

MonthHeating DDCooling DDGrowing DD 50
January1,06000
February81902
March68208
April460061
May2345245
June10269418
July11196650
August13155607
September13637353
October461085
November79506
December1,06000

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 12.1 km from Granger. 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 USC00458211 (Sunnyside #2). Public domain.