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Old 01-14-2007, 12:02 AM
 
Location: WPB, FL. Dreaming of Oil city, PA
2,909 posts, read 13,278,434 times
Reputation: 1011

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http://www.usna.usda.gov/Hardzone/hrdzon3.html



Introduction
This map supersedes U.S. Department of Agriculture Miscellaneous Publication 814, "Plant Hardiness Zone Map," which was revised in 1965. This 1990 version shows in detail the lowest temperatures that can be expected each year in the United States, Canada, and Mexico. These temperatures are referred to as "average annual minimum temperatures" and are based on the lowest temperatures recorded for each of the years 1974 to 1986 in the United States and Canada and 1971 to 1984 in Mexico. The map shows 10 different zones, each of which represents an area of winter hardiness for the plants of agriculture and our natural landscape. It also introduces zone 11 to represent areas that have average annual minimum temperatures above 40 F (4.4 C) and that are therefore essentially frost free.


Probably the most important consideration in determining what garden and landscape plants
you can grow in your garden is whether or not they will survive the climate in your area.
The USDA Plant Hardiness Zone Map factors in average winter minimum temperatures. This collection of information starts with Zone 1, where minimum temperatures can go down to MINUS 50 degrees Fahrenheit, and ranges to Zone 11, for the lucky gardeners in Hawaii and extreme Southern Florida where lows don't drop below 40 degrees Fahrenheit.
The data on which the USDA map is based was gathered over a period of 60 years.

Hello, I am checking the temperature zone for my city West Palm Beach. This website says im zone 10a with an average annual minimum of 30. I can tell you right now this is not true, maybe it was in the past. I have never experienced any frost in West Palm Beach and I was born there and lived all my life in that city. Guys, check the temperatures from 1990 to 2006(winter of 2007 isnt over yet) and average them up to get an update for your zone and any other city zones you want. Be sure to check at least 5 months(from November to March) If there is a tie with more than one day with the same minimum, choose one. The USDA Plant Hardiness Zone Map was last revised in 1990 so its 17 years outdated.

West Palm Beach, FL annual minimum for 1990-2005:

1990 January 13, minimum 46.
1991 February 16, minimum 37.
1992 January 16, minimum 42.
1993 March 15, minimum 41.
1994 unknown
1995 unknown
1996 unknown
1997 January 19, minimum 36.
1998 February 8, minimum 45.
1999 January 6, minimum 41.
2000 January 27, minimum 36.
2001 January 1, minimum 36.
2002 January 4, minimum 36.
2003 January 24, minimum 34.
2004 December 15, minimum 41.
2005 January 24, minimum 38.
2006 February 14, minimum 36.

I used wunderground com for this data. For some reason they have no data for three years(not bad out of 17 years). Just dont include them in the average. Ok add up all the years with data then divide.

46+37+42+41+36+45+41+36+36+36+34+41+38+36=545/14=38.9
This pretty much makes us zone 11 if we round to the nearest zone(see image) Also I have never seen frost/snow in my life so id consider West Palm Beach to be tropical!

Franklin/Oil city, PA annual minimum for 1990-2005:

1990 February 26, minimum -4.
1991 January 22, minimum 2.
1992 January 19, minimum 2.
1993 December 27, minimum -4.
1994 unknown
1995 unknown
1996 unknown
1997 January 19, minimum -7.
1998 December 23, minimum 5.
1999 March 8, minimum -2.
2000 January 22, minimum 0.
2001 January 3, minimum 6.
2002 December 4, minimum 3.
2003 January 27, minimum -4.
2004 January 25, minimum -7.
2005 January 28, minimum -5.
2006 February 19, minimum 1.

(-4)+2+2(-4)(-7)+5(-2)+0+6+3(-4)(-7)(-5)+1=-15/14=-1.1
This makes Oil city/Franklin zone 7a, but for those who are conservative, they would probably consider it zone 6b because theres a 50% chance annually of seeing at least one day in the low minus.

Parkersburg(near Woodsfield, OH), WV annual minimum for 1990-2005:

1990 December 23, minimum 3.
1991 February 16, minimum 6.
1992 January 19, minimum 1.
1993 February 19, minimum 2.
1994 unknown
1995 unknown
1996 unknown
1997 January 19, minimum 0.
1998 December 25, minimum 8.
1999 January 5, minimum 0.
2000 January 22, minimum -5.
2001 January 3, minimum 7.
2002 January 1, minimum 5.
2003 January 27, minimum -5.
2004 January 31, minimum 0.
2005 January 24, minimum 1.
2006 February 19, minimum 2.

3+6+1+2+0+8+0(-5)+7+5(-5)+0+1+2=25/14=1.8
Zone 7a, but the average temperature appears 5-7 higher than
Oil city/Franklin. The summers definately get hotter and stay hot
much longer as well. Can get cold but those cold snaps are generally
brief and most winter days have highs above freezing.
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Old 01-14-2007, 12:31 AM
 
Location: Journey's End
10,194 posts, read 25,468,530 times
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NaH,

I don't understand these tables--at all

I've always lived in a 5 or 6 zone; can't recall all those (a) and (b) designations. But I do know that temperatures have varied a great deal and my little plant children did not do well this year (new climate for me, but not such a different zone).
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Old 01-14-2007, 12:38 AM
 
Location: WPB, FL. Dreaming of Oil city, PA
2,909 posts, read 13,278,434 times
Reputation: 1011
If you give me your city, I can quickly estimate your zone. You can check wunderground com and the lowest temperature for the following years and average them out. See my examples.
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Old 01-14-2007, 09:35 AM
j33
 
4,625 posts, read 13,185,805 times
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Zone 5b -15 to -10 F or -23.4 to -26.1 C

My problem is finding dirt to plant things in. However, there is a community garden a couple blocks from my apartment. I think I'm going to sign up for a plot this year and grow some veggies and some flowers.
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Old 01-14-2007, 09:48 AM
 
Location: Journey's End
10,194 posts, read 25,468,530 times
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Thanks, NaH, but it's snowing again and I can't see my garden.

I'm certain that by the time Spring has Sprung I'll be in a difference zone
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Old 01-14-2007, 02:18 PM
 
Location: Red Sox Nation
674 posts, read 2,516,814 times
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Lovin' life here in zone 6a
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Old 01-14-2007, 03:52 PM
 
2,359 posts, read 8,379,129 times
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Need_affordable_home, can you do an annual minimum showing the years 1990-2005 for Syracuse, NY? Can't seem to find the info on that website? Thanks!
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Old 01-14-2007, 05:29 PM
 
Location: WPB, FL. Dreaming of Oil city, PA
2,909 posts, read 13,278,434 times
Reputation: 1011
Quote:
Originally Posted by bellafinzi View Post
Need_affordable_home, can you do an annual minimum showing the years 1990-2005 for Syracuse, NY? Can't seem to find the info on that website? Thanks!

http://www.wunderground.com/history/...lyHistory.html

I got the data from the above link. Ill check 2003, 2004, 2005 and 2006 as a quick check. -1 for 2006, -18 for 2005(wow!) -18 for 2004(wow!) -9 for 2003
A quick estimate puts you in zone 5b(-15 annual minimum average) but maybe you had some warmer years in the past that could make you zone 6a, the above link is provided for details.

The zone map of 1990 is outdated, the world is a warmer place now. Most zones are one zone warmer now than in the past.
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Old 01-14-2007, 08:28 PM
 
2,359 posts, read 8,379,129 times
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^Thanks for the info! I remember those arctic air outbreaks in the winters of 2005 and 2004...really extreme temperatures even for Upstate NY.

Zone 5b sounds about right. There was one map I saw that put Syracuse in zone 6. I could grow many more plants if I knew Syracuse is in a solid zone 6. Fig trees have no problem surviving the winters here. They do have top kill, only coming back from the base of the plant if not protected. One advantage of all this snow in Syracuse is that snow acts as an insulator and protects the plants from the extreme temperatures. Not too sure about this, but I've heard the temperature under the snow stays around 30 degrees even if the air temperature is below zero.

That website has great info. I'll need to check out the annual minimum for the 1990s to find the long term trend for Syracuse....
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Old 01-14-2007, 09:31 PM
 
Location: Heartland Florida
9,324 posts, read 24,598,609 times
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Zone 10 all the way. Biggest issue here is lack of water and salt tolerance.
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