Salome climate

Salome Frost Dates and Growing Season

NOAA 1991-2020 normals for Bouse, 41.9 km from Salome, elevation 925 ft

Frost and the growing season

NOAA's 1991-2020 freeze probabilities for Bouse. 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 February 18 and the first fall freeze around November 28, a growing season of about 284 days.

Median at 36°F
last March 10, first November 17
Median at 32°F
last February 18, first November 28
Median at 28°F
last January 29, first December 9

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°FApr 3Mar 27Mar 21Mar 15Mar 10Mar 5Mar 1Feb 25Feb 17
32°FMar 12Mar 4Feb 28Feb 24Feb 18Feb 13Feb 6Jan 31Jan 24
28°FFeb 24Feb 13Feb 6Feb 1Jan 29Jan 21Jan 13Jan 6Dec 29
24°FFeb 5Jan 28Jan 19Jan 11Jan 7Jan 1Dec 29Dec 21Dec 12
20°FJan 25Jan 11Jan 6Jan 1Dec 30Dec 26Dec 21Dec 15Dec 9
16°F–––––––––

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°FNov 1Nov 7Nov 11Nov 14Nov 17Nov 19Nov 22Nov 25Nov 30
32°FNov 12Nov 18Nov 22Nov 25Nov 28Dec 1Dec 4Dec 8Dec 15
28°FNov 24Nov 28Dec 1Dec 5Dec 9Dec 14Dec 19Dec 25Jan 2
24°FDec 3Dec 8Dec 13Dec 19Dec 23Dec 29Jan 2Jan 9Jan 24
20°FDec 8Dec 12Dec 19Dec 24Dec 28Dec 31Jan 4Jan 9Jan 24
16°F–––––––––

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°F276267260253247241236230222
32°F313304296290284278272265252
28°F352340333327322315306298285
24°F365365365361354348341334322
20°F365365365365365365365363350
16°F365365365365365365365365365

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
97% of years
24°F or colder
67% of years
20°F or colder
22% of years
16°F or colder
2% 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
1,536
Cooling degree days, base 65°F
3,861
Growing degree days, base 40°F
11,453
Growing degree days, base 45°F
9,656
Growing degree days, base 50°F
7,943
Growing degree days, base 55°F
6,388
Growing degree days, base 60°F
5,034

Growing degree days by month, base 50°F

Heating and cooling by month

MonthHeating DDCooling DDGrowing DD 50
January419093
February2682170
March12841380
April31159578
May2412874
June06631,113
July08771,342
August08491,314
September05991,049
October20237682
November20522279
December464070

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 41.9 km from Salome. 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 USC00020949 (Bouse). Public domain.