Moro climate

Moro Frost Dates and Growing Season

NOAA 1991-2020 normals for Moro, 0.6 km from Moro, elevation 1870 ft

Frost and the growing season

NOAA's 1991-2020 freeze probabilities for Moro. 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 12 and the first fall freeze around October 4, a growing season of about 143 days.

Median at 36°F
last June 5, first September 19
Median at 32°F
last May 12, first October 4
Median at 28°F
last April 26, first October 16

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°FJun 30Jun 21Jun 15Jun 10Jun 5May 31May 27May 22May 16
32°FMay 31May 24May 20May 15May 12May 8May 5May 1Apr 27
28°FMay 11May 5May 1Apr 29Apr 26Apr 23Apr 19Apr 14Apr 8
24°FApr 25Apr 16Apr 11Apr 6Apr 3Mar 29Mar 24Mar 17Mar 9
20°FApr 3Mar 27Mar 20Mar 13Mar 8Mar 3Feb 27Feb 21Feb 12
16°FMar 13Mar 4Feb 27Feb 22Feb 18Feb 10Feb 2Jan 22Jan 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°FAug 30Sep 5Sep 10Sep 14Sep 19Sep 22Sep 26Sep 29Oct 4
32°FSep 16Sep 24Sep 28Oct 1Oct 4Oct 6Oct 9Oct 13Oct 18
28°FOct 1Oct 6Oct 10Oct 13Oct 16Oct 19Oct 23Oct 27Nov 2
24°FOct 14Oct 19Oct 24Oct 28Oct 31Nov 3Nov 7Nov 13Nov 21
20°FOct 25Oct 30Nov 4Nov 9Nov 13Nov 19Nov 24Nov 29Dec 8
16°FNov 1Nov 10Nov 18Nov 24Nov 28Dec 3Dec 8Dec 16Dec 24

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°F12811911210710296898272
32°F164156151146143138132125115
28°F196188183178173168164157150
24°F240229221215210205198190180
20°F289273264257250242236227217
16°F331316306298288279270262249

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
99% 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
6,219
Cooling degree days, base 65°F
401
Growing degree days, base 40°F
4,179
Growing degree days, base 45°F
3,023
Growing degree days, base 50°F
2,088
Growing degree days, base 55°F
1,346
Growing degree days, base 60°F
788

Growing degree days by month, base 50°F

Heating and cooling by month

MonthHeating DDCooling DDGrowing DD 50
January1,01400
February82501
March73807
April551040
May33610174
June17342323
July50158573
August49148564
September17240324
October491176
November79405
December1,02801

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 0.6 km from Moro. 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 USC00355734 (Moro). Public domain.