Hatton climate

Hatton Frost Dates and Growing Season

NOAA 1991-2020 normals for Mayville, 17.4 km from Hatton, elevation 983 ft

Frost and the growing season

NOAA's 1991-2020 freeze probabilities for Mayville. 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 May 13 and the first fall freeze around September 27, a growing season of about 136 days.

Median at 36°F
last May 23, first September 17
Median at 32°F
last May 13, first September 27
Median at 28°F
last May 4, first October 6

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°FJun 2May 30May 27May 25May 23May 21May 18May 15May 11
32°FMay 25May 21May 18May 15May 13May 11May 8May 4Apr 30
28°FMay 17May 13May 10May 7May 4May 1Apr 29Apr 26Apr 20
24°FMay 8May 4Apr 30Apr 27Apr 25Apr 21Apr 18Apr 14Apr 9
20°FApr 29Apr 24Apr 19Apr 16Apr 13Apr 11Apr 8Apr 5Apr 2
16°FApr 21Apr 15Apr 12Apr 9Apr 6Apr 4Apr 2Mar 31Mar 23

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

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°F133128123120117114111107101
32°F154147143139136133129125119
28°F173166161158154150147143136
24°F193186181177174170165160153
20°F212206202198193190184179173
16°F229222217213209205202197190

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
9,628
Cooling degree days, base 65°F
344
Growing degree days, base 40°F
3,710
Growing degree days, base 45°F
2,804
Growing degree days, base 50°F
2,010
Growing degree days, base 55°F
1,324
Growing degree days, base 60°F
759

Growing degree days by month, base 50°F

Heating and cooling by month

MonthHeating DDCooling DDGrowing DD 50
January1,82200
February1,53300
March1,29601
April761020
May36714180
June8475443
July28132569
August53100513
September25721240
October682244
November1,14600
December1,59900

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 Hatton. 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 USC00325660 (Mayville). Public domain.