Rouses Point climate

Rouses Point Frost Dates and Growing Season

NOAA 1991-2020 normals for St Albans Radio, 26.3 km from Rouses Point, elevation 380 ft

Frost and the growing season

NOAA's 1991-2020 freeze probabilities for St Albans Radio. 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 May 1 and the first fall freeze around October 12, a growing season of about 161 days.

Median at 36°F
last May 12, first October 2
Median at 32°F
last May 1, first October 12
Median at 28°F
last April 21, first October 23

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 26May 22May 19May 15May 12May 10May 7May 3Apr 29
32°FMay 16May 10May 7May 4May 1Apr 29Apr 26Apr 24Apr 20
28°FMay 5Apr 30Apr 27Apr 24Apr 21Apr 19Apr 17Apr 14Apr 9
24°FApr 23Apr 19Apr 16Apr 14Apr 11Apr 9Apr 7Apr 5Apr 2
20°FApr 15Apr 10Apr 7Apr 5Apr 4Apr 2Mar 31Mar 29Mar 22
16°FApr 8Apr 5Apr 2Apr 1Mar 30Mar 26Mar 23Mar 19Mar 15

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 24Sep 27Sep 30Oct 2Oct 4Oct 7Oct 10Oct 15
32°FSep 28Oct 2Oct 6Oct 9Oct 12Oct 15Oct 18Oct 21Oct 26
28°FOct 6Oct 12Oct 16Oct 20Oct 23Oct 27Oct 30Nov 1Nov 6
24°FOct 17Oct 25Oct 29Nov 1Nov 3Nov 6Nov 9Nov 13Nov 19
20°FOct 31Nov 4Nov 7Nov 11Nov 14Nov 17Nov 21Nov 25Nov 30
16°FNov 8Nov 13Nov 17Nov 21Nov 24Nov 26Nov 29Dec 2Dec 7

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°F160154149146142138134130123
32°F181174169165161158153149142
28°F204197192187183179175169163
24°F224217212208205201197192185
20°F242235231227224220215211206
16°F257251245241238235231226220

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
7,810
Cooling degree days, base 65°F
449
Growing degree days, base 40°F
4,190
Growing degree days, base 45°F
3,186
Growing degree days, base 50°F
2,304
Growing degree days, base 55°F
1,544
Growing degree days, base 60°F
918

Growing degree days by month, base 50°F

Heating and cooling by month

MonthHeating DDCooling DDGrowing DD 50
January1,49901
February1,27500
March1,13502
April670136
May30019217
June8487454
July14174625
August35130560
September18137316
October532283
November848010
December1,23801

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 26.3 km from Rouses Point. 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 USC00437032 (St Albans Radio). Public domain.