Condon climate

Condon Frost Dates and Growing Season

NOAA 1991-2020 normals for Condon, 0.9 km from Condon, elevation 2881 ft

Frost and the growing season

NOAA's 1991-2020 freeze probabilities for Condon. 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 10 and the first fall freeze around October 7, a growing season of about 148 days.

Median at 36°F
last May 31, first September 25
Median at 32°F
last May 10, first October 7
Median at 28°F
last April 25, first October 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°FJun 20Jun 11Jun 6Jun 2May 31May 26May 22May 16May 10
32°FMay 27May 21May 17May 13May 10May 7May 3Apr 30Apr 25
28°FMay 12May 6May 1Apr 28Apr 25Apr 20Apr 16Apr 10Mar 31
24°FApr 28Apr 19Apr 9Apr 2Mar 29Mar 22Mar 15Mar 9Mar 2
20°FApr 3Mar 19Mar 9Mar 4Feb 28Feb 25Feb 20Feb 12Feb 2
16°FMar 6Feb 28Feb 22Feb 17Feb 11Feb 4Jan 27Jan 13Jan 2

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 4Sep 11Sep 16Sep 22Sep 25Sep 28Oct 2Oct 5Oct 9
32°FSep 21Sep 28Oct 2Oct 5Oct 7Oct 11Oct 15Oct 18Oct 24
28°FOct 7Oct 12Oct 16Oct 20Oct 24Oct 27Oct 30Nov 3Nov 10
24°FOct 21Oct 28Nov 1Nov 4Nov 9Nov 13Nov 17Nov 23Nov 29
20°FOct 31Nov 7Nov 13Nov 19Nov 23Nov 27Dec 1Dec 6Dec 16
16°FNov 8Nov 18Nov 25Dec 1Dec 5Dec 9Dec 15Dec 22Jan 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°F1401321251201141091049888
32°F171164158153148142136130120
28°F209197191186180176170163156
24°F255244237229222216209200189
20°F304289281272266259251241226
16°F341328316308299291284274259

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
6,178
Cooling degree days, base 65°F
371
Growing degree days, base 40°F
4,181
Growing degree days, base 45°F
3,011
Growing degree days, base 50°F
2,067
Growing degree days, base 55°F
1,327
Growing degree days, base 60°F
764

Growing degree days by month, base 50°F

Heating and cooling by month

MonthHeating DDCooling DDGrowing DD 50
January99201
February82201
March73509
April561039
May34510168
June18232305
July45148569
August43139561
September17440324
October490280
November770010
December1,02101

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 0.9 km from Condon. 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 USC00351765 (Condon). Public domain.