Verdi climate

Verdi Frost Dates and Growing Season

NOAA 1991-2020 normals for Verdi 2W, 3.3 km from Verdi, elevation 5429 ft

Frost and the growing season

NOAA's 1991-2020 freeze probabilities for Verdi 2W. 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 9 and the first fall freeze around October 17, a growing season of about 156 days.

Median at 36°F
last May 31, first October 5
Median at 32°F
last May 9, first October 17
Median at 28°F
last April 24, first October 31

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 16Jun 10Jun 5Jun 2May 31May 27May 23May 17May 11
32°FJun 2May 26May 19May 14May 9May 5May 2Apr 29Apr 23
28°FMay 16May 7May 1Apr 28Apr 24Apr 20Apr 17Apr 12Apr 7
24°FApr 25Apr 18Apr 14Apr 10Apr 6Apr 2Mar 29Mar 20Mar 10
20°FApr 9Apr 2Mar 27Mar 20Mar 14Mar 8Mar 2Feb 25Feb 16
16°FMar 20Mar 10Mar 4Feb 28Feb 22Feb 17Feb 11Feb 2Jan 17

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 16Sep 25Sep 29Oct 2Oct 5Oct 8Oct 11Oct 14Oct 19
32°FOct 1Oct 5Oct 9Oct 13Oct 17Oct 20Oct 24Oct 29Nov 3
28°FOct 13Oct 19Oct 23Oct 27Oct 31Nov 3Nov 6Nov 9Nov 16
24°FOct 26Nov 1Nov 5Nov 9Nov 11Nov 16Nov 19Nov 23Nov 29
20°FNov 5Nov 12Nov 17Nov 21Nov 24Nov 28Dec 1Dec 5Dec 9
16°FNov 13Nov 21Nov 28Dec 2Dec 6Dec 10Dec 14Dec 19Jan 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°F15114213513012512011610999
32°F181172166161156150144136125
28°F212204197192188183177170161
24°F248237229224219213207200191
20°F285273266259252246239231217
16°F324311301294286278271262251

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
99% 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
6,084
Cooling degree days, base 65°F
342
Growing degree days, base 40°F
4,276
Growing degree days, base 45°F
3,115
Growing degree days, base 50°F
2,167
Growing degree days, base 55°F
1,400
Growing degree days, base 60°F
801

Growing degree days by month, base 50°F

Heating and cooling by month

MonthHeating DDCooling DDGrowing DD 50
January98600
February83402
March76609
April612026
May3874136
June15843344
July21141586
August19109555
September13142373
October4334119
November729018
December1,00800

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 3.3 km from Verdi. 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 USC00049298 (Verdi 2W). Public domain.