Edgewater climate

Edgewater Frost Dates and Growing Season

NOAA 1991-2020 normals for Annapolis Naf, 9.3 km from Edgewater, elevation 8 ft

Frost and the growing season

NOAA's 1991-2020 freeze probabilities for Annapolis Naf. 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 March 23 and the first fall freeze around November 20, a growing season of about 241 days.

Median at 36°F
last April 5, first November 6
Median at 32°F
last March 23, first November 20
Median at 28°F
last March 12, first December 3

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 20Apr 16Apr 11Apr 8Apr 5Apr 3Mar 31Mar 28Mar 22
32°FApr 6Apr 2Mar 31Mar 27Mar 23Mar 20Mar 18Mar 13Mar 8
28°FMar 28Mar 22Mar 18Mar 15Mar 12Mar 8Mar 5Mar 1Feb 24
24°FMar 19Mar 13Mar 8Mar 4Mar 1Feb 26Feb 22Feb 16Feb 9
20°FMar 7Mar 1Feb 25Feb 19Feb 14Feb 9Feb 4Jan 31Jan 19
16°FFeb 25Feb 16Feb 8Feb 4Jan 31Jan 27Jan 19Jan 14Jan 3

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 25Oct 30Nov 1Nov 3Nov 6Nov 9Nov 12Nov 16Nov 21
32°FNov 4Nov 10Nov 13Nov 17Nov 20Nov 23Nov 27Dec 1Dec 5
28°FNov 16Nov 22Nov 27Dec 1Dec 3Dec 6Dec 10Dec 15Dec 22
24°FNov 30Dec 4Dec 8Dec 13Dec 18Dec 21Dec 25Dec 31Jan 9
20°FDec 10Dec 18Dec 22Dec 26Dec 31Jan 4Jan 10Jan 16Jan 26
16°FDec 21Dec 26Jan 1Jan 5Jan 10Jan 15Jan 18Jan 26Feb 4

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°F234227223219215210205200193
32°F265255250245241236232226219
28°F291281276271266261256250242
24°F316307301296291286280275267
20°F347333327320314308304298288
16°F365365355345337333327319307

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
97% of years
16°F or colder
79% 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
4,062
Cooling degree days, base 65°F
1,436
Growing degree days, base 40°F
6,926
Growing degree days, base 45°F
5,500
Growing degree days, base 50°F
4,246
Growing degree days, base 55°F
3,150
Growing degree days, base 60°F
2,221

Growing degree days by month, base 50°F

Heating and cooling by month

MonthHeating DDCooling DDGrowing DD 50
January88505
February746013
March599154
April30114196
May8590470
June4292738
July0432897
August0375840
September15198633
October19833307
November474177
December755016

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 9.3 km from Edgewater. 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 USW00013752 (Annapolis Naf). Public domain.