Sunrise Manor climate

Sunrise Manor Frost Dates and Growing Season

NOAA 1991-2020 normals for N Las Vegas, 4.7 km from Sunrise Manor, elevation 1898 ft

Frost and the growing season

NOAA's 1991-2020 freeze probabilities for N Las Vegas. 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 1 and the first fall freeze around December 8, a growing season of about 311 days.

Median at 36°F
last February 20, first November 26
Median at 32°F
last February 1, first December 8
Median at 28°F
last January 4, first December 21

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 9Mar 3Feb 28Feb 24Feb 20Feb 16Feb 11Feb 5Jan 31
32°FFeb 24Feb 17Feb 11Feb 5Feb 1Jan 26Jan 19Jan 10Jan 2
28°FFeb 8Jan 31Jan 21Jan 11Jan 4Jan 1Dec 28Dec 20Dec 12
24°FJan 29Jan 14Jan 6Jan 2Dec 30Dec 25Dec 19Dec 15Dec 10
20°F–––––––––
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 11Nov 16Nov 20Nov 23Nov 26Nov 28Dec 1Dec 5Dec 10
32°FNov 23Nov 27Dec 1Dec 5Dec 8Dec 11Dec 15Dec 20Dec 27
28°FDec 1Dec 8Dec 12Dec 16Dec 21Dec 26Dec 30Jan 5Jan 24
24°FDec 9Dec 14Dec 18Dec 23Dec 27Dec 31Jan 2Jan 8Jan 25
20°F–––––––––
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°F303294287282278273269263255
32°F341332324317311305299291282
28°F365365363356349343336329319
24°F365365365365365365365365353
20°F365365365365365365365365365
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
99% of years
28°F or colder
73% of years
24°F or colder
16% of years
20°F or colder
1% of years
16°F or colder
0% 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
1,839
Cooling degree days, base 65°F
3,604
Growing degree days, base 40°F
10,899
Growing degree days, base 45°F
9,125
Growing degree days, base 50°F
7,468
Growing degree days, base 55°F
5,996
Growing degree days, base 60°F
4,717

Growing degree days by month, base 50°F

Heating and cooling by month

MonthHeating DDCooling DDGrowing DD 50
January482055
February3311120
March16235342
April56130524
May9370826
June16521,101
July08521,317
August08011,266
September0545994
October28203640
November24915236
December521045

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 4.7 km from Sunrise Manor. 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 USC00265705 (N Las Vegas). Public domain.