Redland climate

Redland Frost Dates and Growing Season

NOAA 1991-2020 normals for Rockville 1 Ne, 4.9 km from Redland, elevation 440 ft

Frost and the growing season

NOAA's 1991-2020 freeze probabilities for Rockville 1 Ne. 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 1 and the first fall freeze around November 6, a growing season of about 219 days.

Median at 36°F
last April 16, first October 25
Median at 32°F
last April 1, first November 6
Median at 28°F
last March 22, first November 19

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

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 12Oct 16Oct 19Oct 22Oct 25Oct 28Oct 30Nov 3Nov 7
32°FOct 24Oct 29Nov 1Nov 3Nov 6Nov 9Nov 12Nov 15Nov 21
28°FNov 5Nov 9Nov 12Nov 16Nov 19Nov 23Nov 28Dec 1Dec 6
24°FNov 14Nov 19Nov 25Nov 29Dec 2Dec 6Dec 10Dec 16Dec 23
20°FNov 28Dec 4Dec 8Dec 14Dec 20Dec 24Dec 28Jan 2Jan 12
16°FDec 11Dec 20Dec 25Dec 30Jan 2Jan 7Jan 12Jan 18Jan 27

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°F212206201197192188184178170
32°F240232226222219215211207200
28°F267258252248243239234229224
24°F294284278273268263258252244
20°F319309304299294288283276267
16°F345333328323317311306300294

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
97% 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
4,455
Cooling degree days, base 65°F
1,279
Growing degree days, base 40°F
6,550
Growing degree days, base 45°F
5,184
Growing degree days, base 50°F
3,981
Growing degree days, base 55°F
2,929
Growing degree days, base 60°F
2,027

Growing degree days by month, base 50°F

Heating and cooling by month

MonthHeating DDCooling DDGrowing DD 50
January94409
February79208
March629357
April30022211
May10592454
June13250687
July0401866
August1340804
September40152563
October26717237
November543271
December823015

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 4.9 km from Redland. 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 USC00187705 (Rockville 1 Ne). Public domain.