Adelanto climate

Adelanto Frost Dates and Growing Season

NOAA 1991-2020 normals for Victorville, 12.2 km from Adelanto, elevation 2880 ft

Frost and the growing season

NOAA's 1991-2020 freeze probabilities for Victorville. 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 18 and the first fall freeze around November 11, a growing season of about 233 days.

Median at 36°F
last April 11, first November 1
Median at 32°F
last March 18, first November 11
Median at 28°F
last February 22, first November 24

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 30Apr 24Apr 20Apr 16Apr 11Apr 8Apr 4Mar 30Mar 22
32°FApr 12Apr 5Mar 31Mar 25Mar 18Mar 13Mar 7Mar 2Feb 23
28°FMar 19Mar 8Mar 2Feb 26Feb 22Feb 16Feb 11Feb 4Jan 27
24°FFeb 25Feb 15Feb 9Feb 2Jan 29Jan 20Jan 10Jan 2Dec 24
20°FFeb 7Jan 26Jan 17Jan 9Jan 3Dec 30Dec 25Dec 15Dec 8
16°FJan 17Jan 10Jan 5Jan 2Dec 31Dec 27Dec 21Dec 14Dec 8

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 16Oct 22Oct 26Oct 30Nov 1Nov 4Nov 6Nov 10Nov 14
32°FOct 27Nov 1Nov 5Nov 8Nov 11Nov 13Nov 17Nov 20Nov 26
28°FNov 7Nov 12Nov 16Nov 20Nov 24Nov 28Dec 1Dec 5Dec 11
24°FNov 16Nov 25Nov 30Dec 3Dec 7Dec 12Dec 18Dec 25Jan 4
20°FDec 1Dec 6Dec 11Dec 15Dec 21Dec 27Jan 1Jan 7Jan 19
16°FDec 6Dec 12Dec 18Dec 23Dec 28Dec 31Jan 3Jan 9Jan 16

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°F226217210205200195190184174
32°F262252246239233228222214203
28°F306294286280273268260252241
24°F353341333325317310302291278
20°F365365365365359351343335325
16°F365365365365365365365365357

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
97% of years
20°F or colder
59% of years
16°F or colder
16% 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
2,869
Cooling degree days, base 65°F
1,767
Growing degree days, base 40°F
8,079
Growing degree days, base 45°F
6,412
Growing degree days, base 50°F
4,932
Growing degree days, base 55°F
3,675
Growing degree days, base 60°F
2,627

Growing degree days by month, base 50°F

Heating and cooling by month

MonthHeating DDCooling DDGrowing DD 50
January595024
February463054
March3602151
April21222271
May83119502
June11302741
July0492956
August0470935
September11293732
October11866416
November3842130
December629020

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 12.2 km from Adelanto. 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 USC00049325 (Victorville). Public domain.