Cypress climate

Cypress Frost Dates and Growing Season

NOAA 1991-2020 normals for Houston Hooks Mem AP, 17.4 km from Cypress, elevation 152 ft

Frost and the growing season

NOAA's 1991-2020 freeze probabilities for Houston Hooks Mem AP. 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 19 and the first fall freeze around December 3, a growing season of about 290 days.

Median at 36°F
last March 7, first November 19
Median at 32°F
last February 19, first December 3
Median at 28°F
last January 31, first December 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°FMar 29Mar 20Mar 15Mar 11Mar 7Mar 2Feb 26Feb 20Feb 11
32°FMar 15Mar 8Mar 1Feb 25Feb 19Feb 13Feb 4Jan 29Jan 21
28°FMar 5Feb 24Feb 14Feb 5Jan 31Jan 24Jan 17Jan 9Dec 28
24°FFeb 23Feb 8Feb 2Jan 25Jan 17Jan 12Jan 7Jan 2Dec 24
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 2Nov 7Nov 11Nov 15Nov 19Nov 22Nov 27Dec 2Dec 8
32°FNov 13Nov 20Nov 25Nov 30Dec 3Dec 7Dec 15Dec 25Jan 5
28°FDec 2Dec 7Dec 15Dec 22Dec 29Jan 3Jan 8Jan 16Feb 1
24°FDec 11Dec 24Jan 1Jan 3Jan 6Jan 11Jan 17Jan 31Feb 6
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°F289278270264258251245238228
32°F332317306298290283276267256
28°F365359349340333324314303289
24°F365365365365365365356346331
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
85% of years
24°F or colder
43% of years
20°F or colder
9% of years
16°F or colder
1% 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
1,368
Cooling degree days, base 65°F
3,146
Growing degree days, base 40°F
10,920
Growing degree days, base 45°F
9,142
Growing degree days, base 50°F
7,443
Growing degree days, base 55°F
5,863
Growing degree days, base 60°F
4,425

Growing degree days by month, base 50°F

Heating and cooling by month

MonthHeating DDCooling DDGrowing DD 50
January38916167
February25232236
March13282423
April37167581
May2368831
June0525975
July06031,068
August06041,069
September0450900
October32217650
November17757345
December34826199

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 17.4 km from Cypress. 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 USW00053910 (Houston Hooks Mem AP). Public domain.