Hines climate

Hines Frost Dates and Growing Season

NOAA 1991-2020 normals for Burns Muni AP, 10.6 km from Hines, elevation 4140 ft

Frost and the growing season

NOAA's 1991-2020 freeze probabilities for Burns Muni AP. 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 11 and the first fall freeze around September 6, a growing season of about 85 days.

Median at 32°F
last June 11, first September 6
Median at 28°F
last May 20, first September 19

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°FJun 28Jun 23Jun 19Jun 15Jun 11Jun 8Jun 4May 30May 21
28°FJun 14Jun 6Jun 1May 26May 20May 16May 12May 7May 2
24°FMay 25May 14May 8May 4May 1Apr 28Apr 25Apr 21Apr 15
20°FMay 6Apr 30Apr 25Apr 20Apr 15Apr 9Apr 2Mar 25Mar 15
16°FApr 20Apr 8Mar 31Mar 23Mar 15Mar 11Mar 6Mar 2Feb 23

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 28Sep 1Sep 3Sep 6Sep 9Sep 13Sep 16Sep 20
28°FSep 3Sep 9Sep 13Sep 16Sep 19Sep 22Sep 25Sep 29Oct 3
24°FSep 17Sep 23Sep 26Sep 29Oct 1Oct 4Oct 7Oct 11Oct 16
20°FSep 30Oct 3Oct 7Oct 10Oct 13Oct 16Oct 21Oct 26Nov 2
16°FOct 8Oct 14Oct 17Oct 22Oct 26Oct 31Nov 3Nov 10Nov 18

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°F797166615752474134
32°F11110094898580746859
28°F14613713112512011410810090
24°F176167162157152147142135124
20°F216203195187181176170163156
16°F255242235227221214206196184

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
7,214
Cooling degree days, base 65°F
302
Growing degree days, base 40°F
3,707
Growing degree days, base 45°F
2,686
Growing degree days, base 50°F
1,855
Growing degree days, base 55°F
1,189
Growing degree days, base 60°F
668

Growing degree days by month, base 50°F

Heating and cooling by month

MonthHeating DDCooling DDGrowing DD 50
January1,19400
February95300
March81502
April632022
May3834145
June19030300
July37150578
August55102512
September23216253
October603043
November90902
December1,21000

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 Hines. Low ground, valleys and open fields freeze earlier and later than a town center or a hillside.

More

Sources

NOAA NCEI U.S. Climate Normals, 1991-2020, annual and seasonal normals for station USW00094185 (Burns Muni AP). Public domain.