Entiat climate

Entiat Frost Dates and Growing Season

NOAA 1991-2020 normals for Entiat Fish Hatchery, 8.9 km from Entiat, elevation 1027 ft

Frost and the growing season

NOAA's 1991-2020 freeze probabilities for Entiat Fish Hatchery. 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 5 and the first fall freeze around October 24, a growing season of about 200 days.

Median at 36°F
last May 2, first October 12
Median at 32°F
last April 5, first October 24
Median at 28°F
last March 13, first November 7

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 3May 18May 11May 6May 2Apr 29Apr 25Apr 20Apr 14
32°FMay 2Apr 21Apr 13Apr 8Apr 5Apr 1Mar 30Mar 25Mar 17
28°FApr 4Mar 30Mar 25Mar 19Mar 13Mar 10Mar 6Mar 3Feb 26
24°FMar 19Mar 10Mar 6Mar 2Feb 28Feb 24Feb 20Feb 14Feb 7
20°FMar 9Mar 2Feb 27Feb 21Feb 16Feb 11Feb 6Jan 31Jan 17
16°FFeb 28Feb 21Feb 14Feb 7Feb 2Jan 27Jan 18Jan 11Jan 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 16Sep 29Oct 3Oct 7Oct 12Oct 16Oct 19Oct 22Oct 27
32°FSep 29Oct 10Oct 17Oct 21Oct 24Oct 27Oct 31Nov 4Nov 10
28°FOct 17Oct 26Oct 31Nov 3Nov 7Nov 10Nov 15Nov 20Nov 25
24°FOct 31Nov 6Nov 10Nov 16Nov 20Nov 24Nov 27Dec 1Dec 9
20°FNov 11Nov 19Nov 24Nov 28Dec 2Dec 6Dec 13Dec 21Jan 1
16°FNov 24Nov 30Dec 5Dec 10Dec 16Dec 21Dec 28Jan 3Jan 13

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°F184176171165160153146136121
32°F227217211205200195186176157
28°F263255248241236230223214199
24°F294285276270265260254246235
20°F325314305299292287279271259
16°F354341332325318311304295282

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
96% 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
5,641
Cooling degree days, base 65°F
690
Growing degree days, base 40°F
5,054
Growing degree days, base 45°F
3,841
Growing degree days, base 50°F
2,800
Growing degree days, base 55°F
1,931
Growing degree days, base 60°F
1,224

Growing degree days by month, base 50°F

Heating and cooling by month

MonthHeating DDCooling DDGrowing DD 50
January1,08000
February82200
March660013
April415191
May20729294
June7887459
July14254705
August15241691
September9775428
October4123114
November77604
December1,06500

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 8.9 km from Entiat. 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 USC00452563 (Entiat Fish Hatchery). Public domain.