Dennard climate

Dennard Frost Dates and Growing Season

NOAA 1991-2020 normals for Dennard 10 Wsw, 15.9 km from Dennard, elevation 1740 ft

Frost and the growing season

NOAA's 1991-2020 freeze probabilities for Dennard 10 Wsw. 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 4 and the first fall freeze around November 2, a growing season of about 212 days.

Median at 36°F
last April 16, first October 22
Median at 32°F
last April 4, first November 2
Median at 28°F
last March 23, first November 16

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 1Apr 27Apr 23Apr 20Apr 16Apr 13Apr 10Apr 6Mar 31
32°FApr 20Apr 14Apr 10Apr 6Apr 4Apr 1Mar 29Mar 25Mar 18
28°FApr 8Apr 4Mar 31Mar 27Mar 23Mar 20Mar 16Mar 11Mar 6
24°FMar 29Mar 21Mar 17Mar 13Mar 10Mar 7Mar 4Feb 28Feb 23
20°FMar 16Mar 10Mar 6Mar 3Feb 28Feb 25Feb 21Feb 16Feb 9
16°FMar 8Mar 2Feb 26Feb 22Feb 17Feb 12Feb 7Feb 1Jan 24

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 9Oct 14Oct 17Oct 19Oct 22Oct 25Oct 28Oct 31Nov 5
32°FOct 19Oct 23Oct 27Oct 31Nov 2Nov 5Nov 9Nov 15Nov 21
28°FOct 31Nov 3Nov 7Nov 11Nov 16Nov 21Nov 25Nov 30Dec 4
24°FNov 8Nov 15Nov 21Nov 25Nov 29Dec 2Dec 7Dec 11Dec 19
20°FNov 20Nov 28Dec 3Dec 8Dec 12Dec 16Dec 22Dec 28Jan 4
16°FDec 2Dec 12Dec 19Dec 23Dec 29Jan 1Jan 6Jan 12Jan 22

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°F210203197192188183179173165
32°F237228223217212207202197190
28°F263255249243238233227221213
24°F288280273266261256250244234
20°F313303296290285281275268259
16°F336327321314308303298291280

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
4,323
Cooling degree days, base 65°F
1,196
Growing degree days, base 40°F
6,597
Growing degree days, base 45°F
5,185
Growing degree days, base 50°F
3,942
Growing degree days, base 55°F
2,873
Growing degree days, base 60°F
1,962

Growing degree days by month, base 50°F

Heating and cooling by month

MonthHeating DDCooling DDGrowing DD 50
January96204
February76408
March565148
April2916197
May10656417
June2233680
July0364829
August0363827
September32149567
October24918264
November523690
December828012

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 15.9 km from Dennard. 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 USC00031935 (Dennard 10 Wsw). Public domain.