Morocco climate

Morocco Frost Dates and Growing Season

NOAA 1991-2020 normals for Rensselaer, 23.5 km from Morocco, elevation 630 ft

Frost and the growing season

NOAA's 1991-2020 freeze probabilities for Rensselaer. 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 23 and the first fall freeze around October 18, a growing season of about 177 days.

Median at 36°F
last May 4, first October 7
Median at 32°F
last April 23, first October 18
Median at 28°F
last April 11, first October 29

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 19May 14May 10May 6May 4May 1Apr 29Apr 25Apr 21
32°FMay 7May 1Apr 29Apr 26Apr 23Apr 20Apr 17Apr 13Apr 9
28°FApr 27Apr 21Apr 17Apr 15Apr 11Apr 8Apr 5Apr 3Mar 29
24°FApr 16Apr 10Apr 6Apr 3Apr 1Mar 29Mar 26Mar 20Mar 14
20°FApr 5Mar 31Mar 28Mar 23Mar 20Mar 16Mar 13Mar 8Mar 2
16°FMar 26Mar 20Mar 16Mar 13Mar 9Mar 6Mar 2Feb 27Feb 20

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 25Sep 30Oct 3Oct 5Oct 7Oct 10Oct 12Oct 15Oct 20
32°FOct 4Oct 9Oct 13Oct 16Oct 18Oct 20Oct 23Oct 27Nov 1
28°FOct 16Oct 21Oct 24Oct 27Oct 29Nov 1Nov 3Nov 6Nov 11
24°FOct 29Nov 1Nov 3Nov 6Nov 9Nov 11Nov 15Nov 19Nov 26
20°FNov 6Nov 10Nov 13Nov 17Nov 21Nov 24Nov 28Dec 2Dec 8
16°FNov 13Nov 19Nov 23Nov 26Nov 30Dec 3Dec 7Dec 12Dec 19

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°F175169164161157153149143136
32°F197189184180177173169164157
28°F219212207203199195190185178
24°F246238232227223218214209202
20°F270260254249244240236231223
16°F291281275269265259253248240

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
6,147
Cooling degree days, base 65°F
891
Growing degree days, base 40°F
5,389
Growing degree days, base 45°F
4,238
Growing degree days, base 50°F
3,213
Growing degree days, base 55°F
2,309
Growing degree days, base 60°F
1,531

Growing degree days by month, base 50°F

Heating and cooling by month

MonthHeating DDCooling DDGrowing DD 50
January1,26901
February1,03902
March826130
April4577120
May18171368
June27204627
July4272733
August9221677
September95101459
October39514164
November744029
December1,10203

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 23.5 km from Morocco. 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 USC00127298 (Rensselaer). Public domain.