Aberdeen climate

Aberdeen Frost Dates and Growing Season

NOAA 1991-2020 normals for Maysville Wwtp, 4.1 km from Aberdeen, elevation 515 ft

Frost and the growing season

NOAA's 1991-2020 freeze probabilities for Maysville Wwtp. 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 18 and the first fall freeze around October 30, a growing season of about 195 days.

Median at 36°F
last April 29, first October 19
Median at 32°F
last April 18, first October 30
Median at 28°F
last April 5, first November 8

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°FMay 15May 9May 4May 1Apr 29Apr 26Apr 23Apr 19Apr 15
32°FMay 4Apr 29Apr 24Apr 21Apr 18Apr 15Apr 12Apr 8Apr 3
28°FApr 22Apr 16Apr 12Apr 8Apr 5Apr 2Mar 31Mar 28Mar 21
24°FApr 9Apr 3Apr 1Mar 30Mar 26Mar 21Mar 17Mar 13Mar 6
20°FApr 1Mar 26Mar 21Mar 17Mar 14Mar 10Mar 5Feb 28Feb 23
16°FMar 22Mar 15Mar 9Mar 5Mar 1Feb 26Feb 22Feb 15Feb 6

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°FOct 7Oct 11Oct 14Oct 17Oct 19Oct 22Oct 25Oct 28Oct 31
32°FOct 17Oct 21Oct 24Oct 28Oct 30Nov 1Nov 3Nov 6Nov 11
28°FOct 29Nov 1Nov 3Nov 5Nov 8Nov 10Nov 13Nov 16Nov 21
24°FNov 4Nov 8Nov 11Nov 14Nov 17Nov 20Nov 23Nov 28Dec 3
20°FNov 10Nov 16Nov 20Nov 25Nov 29Dec 2Dec 5Dec 11Dec 20
16°FNov 20Nov 29Dec 4Dec 8Dec 13Dec 19Dec 25Dec 30Jan 5

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°F191185181176173169165160152
32°F212206202198195192188182175
28°F235229224219215212208203197
24°F261253247241236232227222216
20°F290281273267261256249243234
16°F318306300293287281274267257

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
4,850
Cooling degree days, base 65°F
1,133
Growing degree days, base 40°F
6,233
Growing degree days, base 45°F
4,923
Growing degree days, base 50°F
3,760
Growing degree days, base 55°F
2,740
Growing degree days, base 60°F
1,867

Growing degree days by month, base 50°F

Heating and cooling by month

MonthHeating DDCooling DDGrowing DD 50
January1,02307
February84708
March685145
April34810178
May12677419
June14224660
July1340804
August2305769
September42153561
October27523244
November605153
December884013

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 4.1 km from Aberdeen. 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 USC00155243 (Maysville Wwtp). Public domain.