Vici climate

Vici Frost Dates and Growing Season

NOAA 1991-2020 normals for Mutual, 14.4 km from Vici, elevation 1890 ft

Frost and the growing season

NOAA's 1991-2020 freeze probabilities for Mutual. 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 19 and the first fall freeze around October 26, a growing season of about 188 days.

Median at 36°F
last April 28, first October 16
Median at 32°F
last April 19, first October 26
Median at 28°F
last April 7, first November 2

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°FMay 10May 6May 3Apr 30Apr 28Apr 25Apr 21Apr 18Apr 13
32°FMay 3Apr 29Apr 25Apr 22Apr 19Apr 16Apr 13Apr 9Apr 1
28°FApr 23Apr 19Apr 15Apr 10Apr 7Apr 4Mar 31Mar 27Mar 19
24°FApr 12Apr 6Apr 2Mar 30Mar 26Mar 20Mar 16Mar 11Mar 4
20°FApr 1Mar 25Mar 18Mar 13Mar 10Mar 6Mar 3Feb 28Feb 22
16°FMar 17Mar 11Mar 6Mar 3Feb 28Feb 25Feb 20Feb 15Feb 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°FOct 2Oct 7Oct 11Oct 14Oct 16Oct 19Oct 22Oct 26Oct 30
32°FOct 11Oct 17Oct 20Oct 23Oct 26Oct 28Nov 1Nov 4Nov 8
28°FOct 19Oct 24Oct 28Oct 31Nov 2Nov 5Nov 8Nov 11Nov 16
24°FOct 25Nov 1Nov 5Nov 8Nov 11Nov 13Nov 17Nov 22Nov 27
20°FNov 3Nov 9Nov 13Nov 18Nov 21Nov 24Nov 28Dec 2Dec 9
16°FNov 12Nov 19Nov 24Nov 27Dec 1Dec 5Dec 10Dec 16Dec 23

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°F190182178174171167163158152
32°F210203197192188184181176168
28°F232225219214209205201195189
24°F255247241235230225220214206
20°F279270264259254249243236226
16°F306296289283277271266260252

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
100% 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
4,375
Cooling degree days, base 65°F
1,698
Growing degree days, base 40°F
7,110
Growing degree days, base 45°F
5,732
Growing degree days, base 50°F
4,505
Growing degree days, base 55°F
3,429
Growing degree days, base 60°F
2,497

Growing degree days by month, base 50°F

Heating and cooling by month

MonthHeating DDCooling DDGrowing DD 50
January93206
February752018
March559490
April29923222
May94124498
June5338783
July1494958
August1450914
September36222637
October23842301
November575270
December88507

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 14.4 km from Vici. 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 USC00346139 (Mutual). Public domain.