Tampico climate

Tampico Frost Dates and Growing Season

NOAA 1991-2020 normals for Walnut, 17.1 km from Tampico, elevation 671 ft

Frost and the growing season

NOAA's 1991-2020 freeze probabilities for Walnut. 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 24 and the first fall freeze around October 14, a growing season of about 172 days.

Median at 36°F
last May 3, first October 4
Median at 32°F
last April 24, first October 14
Median at 28°F
last April 12, first October 24

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 20May 14May 10May 6May 3Apr 30Apr 28Apr 24Apr 20
32°FMay 9May 4Apr 30Apr 27Apr 24Apr 21Apr 18Apr 15Apr 10
28°FApr 29Apr 22Apr 18Apr 15Apr 12Apr 9Apr 7Apr 4Mar 31
24°FApr 18Apr 12Apr 8Apr 5Apr 3Mar 31Mar 29Mar 23Mar 17
20°FApr 6Apr 2Mar 31Mar 27Mar 24Mar 20Mar 17Mar 12Mar 8
16°FMar 30Mar 24Mar 20Mar 17Mar 14Mar 11Mar 8Mar 4Feb 28

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°FSep 21Sep 25Sep 29Oct 1Oct 4Oct 6Oct 9Oct 12Oct 16
32°FSep 30Oct 5Oct 8Oct 11Oct 14Oct 16Oct 19Oct 22Oct 27
28°FOct 11Oct 15Oct 19Oct 21Oct 24Oct 26Oct 29Nov 1Nov 5
24°FOct 20Oct 25Oct 28Oct 31Nov 2Nov 5Nov 8Nov 12Nov 17
20°FNov 1Nov 4Nov 7Nov 10Nov 13Nov 16Nov 19Nov 23Nov 29
16°FNov 7Nov 12Nov 16Nov 19Nov 22Nov 25Nov 29Dec 3Dec 9

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°F169164159155152148144139132
32°F191185180176172168164159152
28°F212204200196193189185179172
24°F235227222217214209205201194
20°F257250244240235230225220213
16°F276268262257253249244238230

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
6,510
Cooling degree days, base 65°F
841
Growing degree days, base 40°F
5,246
Growing degree days, base 45°F
4,117
Growing degree days, base 50°F
3,113
Growing degree days, base 55°F
2,228
Growing degree days, base 60°F
1,467

Growing degree days by month, base 50°F

Heating and cooling by month

MonthHeating DDCooling DDGrowing DD 50
January1,36100
February1,10701
March854022
April4729113
May18565358
June27191614
July5264724
August12207660
September10992438
October41313156
November789025
December1,17602

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 17.1 km from Tampico. 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 USC00118916 (Walnut). Public domain.