Round Lake climate

Round Lake Frost Dates and Growing Season

NOAA 1991-2020 normals for Saratoga Springs 4 Sw, 11.6 km from Round Lake, elevation 326 ft

Frost and the growing season

NOAA's 1991-2020 freeze probabilities for Saratoga Springs 4 Sw. 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 2 and the first fall freeze around October 7, a growing season of about 158 days.

Median at 36°F
last May 15, first September 29
Median at 32°F
last May 2, first October 7
Median at 28°F
last April 20, first October 21

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 29May 24May 20May 18May 15May 11May 8May 4Apr 30
32°FMay 17May 11May 8May 5May 2Apr 30Apr 27Apr 25Apr 21
28°FMay 4Apr 29Apr 25Apr 23Apr 20Apr 18Apr 15Apr 12Apr 8
24°FApr 20Apr 16Apr 13Apr 10Apr 8Apr 6Apr 3Mar 31Mar 29
20°FApr 9Apr 6Apr 3Apr 2Mar 31Mar 28Mar 24Mar 21Mar 16
16°FApr 3Mar 31Mar 28Mar 25Mar 22Mar 19Mar 16Mar 13Mar 9

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 17Sep 22Sep 25Sep 27Sep 29Oct 1Oct 3Oct 5Oct 10
32°FSep 27Oct 1Oct 3Oct 5Oct 7Oct 11Oct 14Oct 18Oct 25
28°FOct 5Oct 11Oct 14Oct 18Oct 21Oct 25Oct 29Nov 2Nov 5
24°FOct 19Oct 25Oct 29Nov 1Nov 3Nov 6Nov 9Nov 13Nov 17
20°FNov 1Nov 5Nov 9Nov 12Nov 15Nov 17Nov 21Nov 25Dec 1
16°FNov 11Nov 16Nov 20Nov 23Nov 26Nov 29Dec 1Dec 4Dec 8

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°F157150145142138134130125120
32°F178171166162158155150145138
28°F203196192187183179174169162
24°F227220215212209204200195188
20°F248242237233229226222217212
16°F269262257252248245240235228

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
6,506
Cooling degree days, base 65°F
670
Growing degree days, base 40°F
4,916
Growing degree days, base 45°F
3,806
Growing degree days, base 50°F
2,829
Growing degree days, base 55°F
1,976
Growing degree days, base 60°F
1,250

Growing degree days by month, base 50°F

Heating and cooling by month

MonthHeating DDCooling DDGrowing DD 50
January1,29701
February1,10000
March92909
April512584
May20239313
June39130542
July4231693
August12191643
September11868404
October4305124
November758017
December1,10701

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 11.6 km from Round Lake. 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 USC00307484 (Saratoga Springs 4 Sw). Public domain.