Mannford climate

Mannford Frost Dates and Growing Season

NOAA 1991-2020 normals for Mannford 6 Nw, 9.3 km from Mannford, elevation 830 ft

Frost and the growing season

NOAA's 1991-2020 freeze probabilities for Mannford 6 Nw. 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 6 and the first fall freeze around October 29, a growing season of about 207 days.

Median at 36°F
last April 18, first October 20
Median at 32°F
last April 6, first October 29
Median at 28°F
last March 24, first November 7

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 4Apr 30Apr 25Apr 21Apr 18Apr 15Apr 12Apr 8Apr 2
32°FApr 23Apr 17Apr 13Apr 10Apr 6Apr 3Mar 31Mar 26Mar 19
28°FApr 11Apr 5Apr 1Mar 28Mar 24Mar 21Mar 16Mar 11Mar 3
24°FApr 1Mar 24Mar 19Mar 15Mar 11Mar 7Mar 3Feb 27Feb 21
20°FMar 19Mar 13Mar 8Mar 4Feb 28Feb 25Feb 21Feb 16Feb 9
16°FMar 12Mar 6Mar 1Feb 24Feb 20Feb 15Feb 9Jan 31Jan 22

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°FOct 2Oct 9Oct 13Oct 16Oct 20Oct 22Oct 26Oct 29Nov 3
32°FOct 14Oct 20Oct 23Oct 26Oct 29Nov 1Nov 4Nov 8Nov 13
28°FOct 23Oct 29Nov 1Nov 4Nov 7Nov 11Nov 14Nov 19Nov 25
24°FNov 1Nov 5Nov 10Nov 14Nov 18Nov 23Nov 28Dec 2Dec 7
20°FNov 8Nov 15Nov 22Nov 26Dec 1Dec 4Dec 7Dec 12Dec 20
16°FNov 21Nov 29Dec 4Dec 8Dec 13Dec 18Dec 23Dec 29Jan 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°F206199193188182178175169162
32°F230223217212207202196190182
28°F256246239233229224219213204
24°F279271263257252246240233222
20°F303294287281276269263256244
16°F329320312305299292286279267

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
3,435
Cooling degree days, base 65°F
1,943
Growing degree days, base 40°F
8,027
Growing degree days, base 45°F
6,522
Growing degree days, base 50°F
5,161
Growing degree days, base 55°F
3,938
Growing degree days, base 60°F
2,863

Growing degree days by month, base 50°F

Heating and cooling by month

MonthHeating DDCooling DDGrowing DD 50
January808122
February616249
March40519182
April17559352
May49154571
June2356804
July0524989
August0498962
September22257686
October16165382
November4449133
December754129

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 9.3 km from Mannford. 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 USC00345522 (Mannford 6 Nw). Public domain.