Coburg climate

Coburg Frost Dates and Growing Season

NOAA 1991-2020 normals for Eugene Mahlon Sweet AP, 12.4 km from Coburg, elevation 353 ft

Frost and the growing season

NOAA's 1991-2020 freeze probabilities for Eugene Mahlon Sweet 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 April 11 and the first fall freeze around October 23, a growing season of about 196 days.

Median at 36°F
last May 15, first October 7
Median at 32°F
last April 11, first October 23
Median at 28°F
last March 3, first November 11

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 8Jun 1May 25May 19May 15May 11May 5Apr 30Apr 24
32°FMay 9Apr 30Apr 25Apr 17Apr 11Apr 3Mar 29Mar 23Mar 15
28°FMar 30Mar 22Mar 14Mar 8Mar 3Feb 27Feb 23Feb 16Feb 2
24°FFeb 27Feb 22Feb 17Feb 12Feb 1Jan 24Jan 12Jan 3Dec 21
20°FFeb 17Feb 1Jan 21Jan 13Jan 5Dec 31Dec 21Dec 12Dec 2
16°FJan 13Jan 4Dec 31Dec 23Dec 17Dec 13Dec 10Dec 5Nov 29

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 18Sep 26Oct 1Oct 4Oct 7Oct 10Oct 13Oct 18Oct 24
32°FOct 6Oct 11Oct 15Oct 19Oct 23Oct 27Oct 31Nov 5Nov 13
28°FOct 20Oct 28Nov 1Nov 6Nov 11Nov 17Nov 24Dec 2Dec 12
24°FNov 2Nov 12Nov 21Nov 29Dec 5Dec 13Dec 22Dec 30Jan 12
20°FNov 10Nov 26Dec 2Dec 10Dec 19Dec 28Jan 2Jan 14Jan 30
16°FNov 17Dec 1Dec 5Dec 9Dec 13Dec 18Dec 26Jan 1Jan 11

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°F173163155150144138133125115
32°F227218209203196188181172162
28°F294279270260252246238230219
24°F350337326316307299291279262
20°F365365365362351342334320308
16°F365365365365365365365355340

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
94% of years
20°F or colder
63% of years
16°F or colder
27% 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
4,616
Cooling degree days, base 65°F
293
Growing degree days, base 40°F
4,987
Growing degree days, base 45°F
3,501
Growing degree days, base 50°F
2,299
Growing degree days, base 55°F
1,386
Growing degree days, base 60°F
725

Growing degree days by month, base 50°F

Heating and cooling by month

MonthHeating DDCooling DDGrowing DD 50
January73207
February609010
March561026
April431069
May2814196
June14623328
July24113553
August24114555
September10138387
October3631136
November587026
December75807

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 12.4 km from Coburg. 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 USW00024221 (Eugene Mahlon Sweet AP). Public domain.