Clancy climate

Clancy Frost Dates and Growing Season

NOAA 1991-2020 normals for Tizer Gardens, 10.6 km from Clancy, elevation 4672 ft

Frost and the growing season

NOAA's 1991-2020 freeze probabilities for Tizer Gardens. 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 June 18 and the first fall freeze around September 5, a growing season of about 81 days.

Median at 32°F
last June 18, first September 5
Median at 28°F
last May 29, first September 18

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°F–––––––––
32°FJul 3Jun 28Jun 24Jun 21Jun 18Jun 14Jun 10Jun 4May 30
28°FJun 19Jun 11Jun 6Jun 1May 29May 25May 21May 18May 12
24°FMay 28May 21May 17May 14May 12May 8May 5May 2Apr 27
20°FMay 12May 7May 3Apr 30Apr 28Apr 24Apr 20Apr 15Apr 8
16°FMay 3Apr 28Apr 23Apr 17Apr 13Apr 8Apr 5Apr 2Mar 27

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°F–––––––––
32°FAug 21Aug 27Aug 30Sep 2Sep 5Sep 8Sep 11Sep 14Sep 18
28°FSep 4Sep 10Sep 13Sep 16Sep 18Sep 21Sep 23Sep 26Oct 1
24°FSep 17Sep 22Sep 25Sep 28Oct 1Oct 3Oct 6Oct 10Oct 16
20°FSep 26Oct 1Oct 4Oct 7Oct 10Oct 14Oct 18Oct 21Oct 30
16°FOct 2Oct 8Oct 14Oct 17Oct 21Oct 25Oct 30Nov 3Nov 9

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°F706357524743393429
32°F1029589858175716558
28°F1321251211151111071039687
24°F163156151146142138133127120
20°F192184177172167163158154146
16°F217209203197192186181175166

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
8,802
Cooling degree days, base 65°F
75
Growing degree days, base 40°F
2,778
Growing degree days, base 45°F
1,905
Growing degree days, base 50°F
1,209
Growing degree days, base 55°F
669
Growing degree days, base 60°F
289

Growing degree days by month, base 50°F

Heating and cooling by month

MonthHeating DDCooling DDGrowing DD 50
January1,30700
February1,15801
March1,02901
April76707
May547059
June3136171
July10035402
August11932382
September3583158
October740026
November1,02801
December1,33700

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 10.6 km from Clancy. 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 USC00248239 (Tizer Gardens). Public domain.