Louise climate

Louise Frost Dates and Growing Season

NOAA 1991-2020 normals for Danevang 1 W, 17.7 km from Louise, elevation 70 ft

Frost and the growing season

NOAA's 1991-2020 freeze probabilities for Danevang 1 W. 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 February 15 and the first fall freeze around December 8, a growing season of about 301 days.

Median at 36°F
last March 3, first November 27
Median at 32°F
last February 15, first December 8
Median at 28°F
last January 27, first December 30

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°FMar 27Mar 18Mar 12Mar 7Mar 3Feb 28Feb 23Feb 18Feb 5
32°FMar 13Mar 5Feb 28Feb 22Feb 15Feb 6Jan 31Jan 23Jan 9
28°FMar 2Feb 20Feb 12Feb 3Jan 27Jan 20Jan 12Jan 2Dec 21
24°FFeb 21Feb 5Jan 27Jan 21Jan 15Jan 8Jan 1Dec 26Dec 17
20°FFeb 13Jan 26Jan 16Jan 10Jan 7Jan 1Dec 31Dec 23Dec 15
16°F–––––––––

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°FNov 4Nov 12Nov 17Nov 22Nov 27Dec 1Dec 4Dec 9Dec 21
32°FNov 13Nov 24Dec 1Dec 4Dec 8Dec 14Dec 24Jan 1Jan 11
28°FDec 1Dec 8Dec 16Dec 24Dec 30Jan 3Jan 9Jan 18Feb 1
24°FDec 10Dec 18Dec 26Jan 1Jan 3Jan 8Jan 14Jan 25Feb 7
20°FDec 14Dec 22Dec 29Jan 1Jan 3Jan 7Jan 12Jan 21Feb 10
16°F–––––––––

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°F301289280274267260254246237
32°F341329316307301294285275261
28°F365365354344337329320309300
24°F365365365365365362352342328
20°F365365365365365365365365357
16°F365365365365365365365365365

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
98% of years
28°F or colder
78% of years
24°F or colder
44% of years
20°F or colder
14% of years
16°F or colder
3% 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
1,306
Cooling degree days, base 65°F
3,081
Growing degree days, base 40°F
10,922
Growing degree days, base 45°F
9,146
Growing degree days, base 50°F
7,442
Growing degree days, base 55°F
5,845
Growing degree days, base 60°F
4,382

Growing degree days by month, base 50°F

Heating and cooling by month

MonthHeating DDCooling DDGrowing DD 50
January38513167
February25224227
March12877424
April34166583
May3347809
June0492942
July05641,029
August05921,057
September1458907
October27248687
November15476388
December32324222

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 17.7 km from Louise. 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 USC00412266 (Danevang 1 W). Public domain.