Roselawn climate

Roselawn Frost Dates and Growing Season

NOAA 1991-2020 normals for Lowell, 16.1 km from Roselawn, elevation 665 ft

Frost and the growing season

NOAA's 1991-2020 freeze probabilities for Lowell. 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 29 and the first fall freeze around October 16, a growing season of about 171 days.

Median at 36°F
last May 8, first October 6
Median at 32°F
last April 29, first October 16
Median at 28°F
last April 16, first October 26

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 25May 19May 15May 11May 8May 5May 2Apr 30Apr 25
32°FMay 14May 8May 4May 1Apr 29Apr 25Apr 22Apr 18Apr 14
28°FMay 3Apr 27Apr 23Apr 19Apr 16Apr 13Apr 9Apr 6Apr 1
24°FApr 21Apr 15Apr 9Apr 5Apr 2Mar 31Mar 28Mar 25Mar 19
20°FApr 7Apr 2Mar 31Mar 28Mar 24Mar 21Mar 18Mar 14Mar 7
16°FMar 30Mar 24Mar 20Mar 17Mar 14Mar 11Mar 7Mar 3Feb 27

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 23Sep 28Oct 1Oct 3Oct 6Oct 8Oct 10Oct 14Oct 18
32°FOct 3Oct 8Oct 11Oct 14Oct 16Oct 19Oct 21Oct 24Oct 28
28°FOct 13Oct 19Oct 22Oct 24Oct 26Oct 28Oct 31Nov 2Nov 8
24°FOct 24Oct 29Nov 1Nov 2Nov 5Nov 8Nov 11Nov 16Nov 22
20°FNov 2Nov 6Nov 10Nov 13Nov 17Nov 21Nov 25Nov 29Dec 4
16°FNov 10Nov 15Nov 20Nov 25Nov 28Dec 1Dec 4Dec 9Dec 16

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°F167161156153150146141136130
32°F190183179175171167163158149
28°F213206201197193190186180173
24°F238229224220216212208202196
20°F263254248242237234229222215
16°F283275269264259254248242234

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
6,352
Cooling degree days, base 65°F
803
Growing degree days, base 40°F
5,197
Growing degree days, base 45°F
4,061
Growing degree days, base 50°F
3,055
Growing degree days, base 55°F
2,173
Growing degree days, base 60°F
1,417

Growing degree days by month, base 50°F

Heating and cooling by month

MonthHeating DDCooling DDGrowing DD 50
January1,29401
February1,07101
March858126
April4866103
May20856330
June35182597
July6254713
August11200654
September10291443
October40112158
November761026
December1,11903

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 16.1 km from Roselawn. 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 USC00125174 (Lowell). Public domain.