Teviston climate

Teviston Frost Dates and Growing Season

NOAA 1991-2020 normals for Delano, 17.9 km from Teviston, elevation 302 ft

Frost and the growing season

NOAA's 1991-2020 freeze probabilities for Delano. 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 January 31 and the first fall freeze around December 8, a growing season of about 309 days.

Median at 36°F
last March 5, first November 24
Median at 32°F
last January 31, first December 8
Median at 28°F
last December 31, first December 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°FApr 4Mar 26Mar 16Mar 10Mar 5Feb 28Feb 22Feb 15Feb 6
32°FMar 5Feb 22Feb 13Feb 6Jan 31Jan 24Jan 15Jan 7Dec 30
28°FJan 30Jan 18Jan 10Jan 5Dec 31Dec 30Dec 25Dec 20Dec 13
24°FJan 6Jan 2Dec 31Dec 30Dec 28Dec 25Dec 23Dec 21Dec 14
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 10Nov 15Nov 18Nov 21Nov 24Nov 26Nov 29Dec 3Dec 8
32°FNov 23Nov 28Dec 1Dec 4Dec 8Dec 11Dec 15Dec 21Dec 30
28°FDec 3Dec 8Dec 12Dec 15Dec 19Dec 23Dec 28Dec 31Jan 9
24°FDec 9Dec 15Dec 18Dec 21Dec 24Dec 27Dec 29Dec 31Jan 3
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°F294282274267261254247240231
32°F341333325317309302293284273
28°F365365365360354348343338329
24°F365365365365365365365365356
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
98% of years
28°F or colder
67% of years
24°F or colder
17% of years
20°F or colder
2% 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
2,282
Cooling degree days, base 65°F
2,036
Growing degree days, base 40°F
8,891
Growing degree days, base 45°F
7,140
Growing degree days, base 50°F
5,546
Growing degree days, base 55°F
4,168
Growing degree days, base 60°F
2,996

Growing degree days by month, base 50°F

Heating and cooling by month

MonthHeating DDCooling DDGrowing DD 50
January563022
February369192
March2513225
April12536362
May29162598
June4364810
July05411,006
August0496961
September3338784
October6195499
November3191156
December559030

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 17.9 km from Teviston. 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 USC00042346 (Delano). Public domain.