Autumn 2011 Frost/Freeze Information

As the autumnal equinox has passed weeks ago, we are entering the time of the year when we can expect much cooler nights, and eventually frosts and freezes. Once the low temperature reaches 32 degrees, the most vulnerable seasonal plants will succumb to the cold. And when the lows reach down to 28 degrees (a hard freeze), virtually all annual plants will die, while perennials enter their winter dormancy stage. Below are maps of the average first light freeze (32 degrees) and first hard freeze (28 degrees), along with a table for select cities across eastern Kansas and Missouri.

Average first fall 32 degree day

Average first fall 28 degree day

City (period of record)

Avg First 32 degree day

Avg First 28 degree day

Amity (1946 – current)

Oct 15

Oct 25

Atchison KS (1893- current)

Oct 20

Oct 30

Bethany (1893 – current)

Oct 9

Oct 20

Boonville (1938 – current)

Oct 26

Nov 4

Brookfield (1942 – current)

Oct 16

Oct 28

Brunswick (1890 – current)

Oct 19

Oct 30

Butler (1946 – current)

Oct 17

Oct 29

Carrollton (1893 – current)

Oct 18

Oct 29

Chillicothe (1980 – current)

Oct 17

Oct 28

Clinton (1907 – current)

Oct 18

Oct 29

Grant City (1902 – current)

Oct 13

Oct 24

Hamilton (1954 – current)

Oct 11

Oct 20

Kansas City (1888 – current)

Oct 28

Nov 6

Kirksville (1893 – current)

Oct 12

Oct 25

Leavenworth (1892 – current)

Oct 20

Oct 31

Lees Summit (1962 – current)

Oct 17

Oct 28

Lexington (1892 – current)

Oct 21

Nov 1

Marshall (1893 – current)

Oct 19

Oct 30

Maryville (1895 – current)

Oct 12

Oct 21

Moberly (1936 – current)

Oct 22

Oct 31

Mound City KS (1950 – current)

Oct 16

Oct 27

New Franklin (1956 – current)

Oct 18

Oct 31

Nevada (1898 – current)

Oct 18

Oct 30

Olathe (1893 – current)

Oct 23

Nov 2

Oregon (1893 – current)

Oct 18

Oct 28

Paola (1895 – current)

Oct 17

Oct 30

Princeton (1893 – current)

Oct 10

Oct 21

Salisbury (1946 – current)

Oct 17

Oct 27

Sedalia (1893 – current)

Oct 17

Oct 30

St Joseph (1908 – current)

Oct 18

Oct 29

Sweet Springs (1941 – current)

Oct 15

Oct 27

Tarkio (1912 – current)

Oct 10

Oct 20

Trenton (1896 – current)

Oct 17

Oct 27

Troy KS (1950 – current)

Oct 16

Oct 29

Unionville (1893 – current)

Oct 13

Oct 24

Warrensburg (1899 – current)

Oct 21

Nov 1

Windsor (1893 – current)

Oct 19

Oct 29

 

Most recent KC Autumns

First 32 degree day

First 28 degree day

2010

Oct 29

Nov 5

2009

Oct 18

Nov 30

2008

Oct 27

Oct 28

2007

Nov 1

Nov 1

2006

Oct 13

Nov 11

2005

Nov 10

Nov 16

2004

Nov 5

Nov 24

2003

Oct 26

Nov 6

2002

Oct 13

Oct 31

2001

Oct 27

Oct 27

2000

Oct 6

Oct 7

 

 

 

Kansas City Avg (1888-2010)

Oct 28

Nov 6

Earliest Date

Sep 22 in 1995

Oct 7 in 2000

Latest Date

Nov 24 in 1931

Nov 29 in 1905

You can monitor the regional frost/freeze and temperatures maps at The Midwest Regional Climate Center.



 

Fall Foliage Report 


Trees usually begin to change colors in portions of Northern Kansas and far Northern Missouri by the end of September and first week of October, progressively expanding southward as the month of October continues. However, normally it isn't until the middle of October when the true colors of fall appear. This is when maples, ashes, oaks and hickories are at the height of their fall display. Unfortunately, by late October, the colors have mostly faded and the leaves begin to drop from the trees. 

 For those interested in the progress of the fall color changes, follow the links below to the Missouri Department of Conservation for further details.  The Missouri Department of Conservation foresters updates fall color reports weekly from mid-September through early November.  In addition, for those interested in fall colors outside of the lower Missouri River Valley, the United States Department of Agriculture Forestry service has established a Fall 2011 leaf change webpage.  This page not only includes detailed information from around the country, but also includes a toll-free hotline for up-to-date fall foliage information.

USDA Forestry Service 2011 National Fall Coverage Page

 Included on both the Missouri and national fall colors pages are a detailed description of observed leaf changes across Missouri as well as some very interesting topics explaining many questions of the Fall season.  Some of these questions include:

 

Why do Leaves Change Color?

What is the Structure of a Leaf?

 What are a Few Common Fall Leaves?
 

 


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