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12-06-2012, 12:35 AM
 Location: Shaw. 2,226 posts, read 3,150,619 times Reputation: 809

Quote:
 Originally Posted by Hawaii4evr It seems like Koppen is contradictory. It classifies Honolulu as semi-arid, and yet also classifies Honolulu as tropical. Look up Koppen on wikipedia, look at the different "subgenres", if you will, of tropical climate, and Honolulu is in fact listed as tropical. Oh, and Aruba is tropical as well. Just because Miami gets more rain doesn't mean Honolulu is not tropical.
I'm not saying I agree with its climate description, but I calculated it.

Honolulu:
Average temperature: 25.45 C
*20 multiplier: 509
% of total precipitation in high-sun months (April to September): 19%
Rain threshold = 509 + 0* = 509
*Add zero to the threshold because the earlier % is less than 30%
Annual precipitation = 433.6mm
433.6<509. Therefore, it is semi-arid.

It's the lack of a true wet season that moves Honolulu into semi-arid. It seems a bit silly because the temperatures are more tropical than Miami. It's really tropics that don't rain as much (seems rather nice). But if you define tropics as hot and wet, Honolulu doesn't fit.

12-06-2012, 12:41 AM
 Location: Shaw. 2,226 posts, read 3,150,619 times Reputation: 809
The Trewartha climate classification scheme has a different formula and Honolulu is tropical under this.

10*(AveTemp - 10) + 3*(% of rain in 6 high sun months); If rain in mm is > 2*this number, then tropical
10*(25.45 - 10) + 3*(19) =
10*(15.45) + 57=
211.5

211.5*2=423
433.6 > 423.

Therefore, tropical.

Blah. Confusing, but Honolulu is tropical under this formula. I don't think anyone here is a climatologist, so I don't think anyone here is qualified to tell me one formula is better than the other.

That said, Trewartha seems to have some things working for him that make more sense than Koppen.

Last edited by pgm123; 12-06-2012 at 12:55 AM..

12-06-2012, 08:40 AM
^^^I trust Trewartha. Honolulu gets a lot of rainfall in the inland and upland areas anyways, while the rain is usualy measured on the drier coast.

12-06-2012, 10:38 AM
 654 posts, read 1,297,533 times Reputation: 276
One thing we can decipher from the collection of data in Koppen and Trewartha's aridity formula is that Honolulu is not true tropical. Honolulu annual precipitation makes over Trewartha's threshold formula...barely. That alone should tell you that Honolulu is at most semi-tropical. The fact that it fails the aridity test for Koppen's formula alone should tell you Honolulu's climate is rather ambiguous as to which Group it be, whether A or B.

Honolulu is semi-tropical at most. I personally believe it is a BSh climate, and I know some other climate gurus that would agree with me.

12-06-2012, 11:24 PM
^^^Honolulu is truly tropical, unlike South Florida. It doesn't matter if it barely makes Trewartha's formula, it still made it. And we do not agree that Honolulu is a desert climate or whatever nonsense you keep spewing. The rainforests on Oahu prove that it is truly tropical.

12-07-2012, 12:51 AM
 Location: Shaw. 2,226 posts, read 3,150,619 times Reputation: 809
Koppen has Honolulu has a hot steppe climate (like Aruba or Aleppo). But Cane, it doesn't matter if it's clearly over the threshold or barely for Trewartha (or others). These climate classifications are set up in a way that if you're just over, you're completely in that zone. Miami barely has the January temperatures to be tropical under Koppen.

12-07-2012, 07:59 PM
 Location: USA East Coast 4,445 posts, read 8,642,796 times Reputation: 2077
Quote:
 Originally Posted by canefandynasty One thing we can decipher from the collection of data in Koppen and Trewartha's aridity formula is that Honolulu is not true tropical. Honolulu annual precipitation makes over Trewartha's threshold formula...barely. That alone should tell you that Honolulu is at most semi-tropical. The fact that it fails the aridity test for Koppen's formula alone should tell you Honolulu's climate is rather ambiguous as to which Group it be, whether A or B. Honolulu is semi-tropical at most. I personally believe it is a BSh climate, and I know some other climate gurus that would agree with me.

From what I understand of it...you are correct - Honolulu is at best semi-tropical...really its more of a steep (B in Trewartha) dry climate, unlike the Florida Keys and deep south Florida which is truly tropical with the rainfall and warm ocean waters.

When I think of the "most" tropical parts of south Florida I allways think of the those clear turquoise tropical Atlantic waters and powdery white sands of Bahia Honda. Add in tropical hammock with dense Caribbean trees and bushes, Gumbo limbo, Jamaica morning glory, West Indies yellow stainwood, native Florida Thatch palms...etc had you see nature the way it should be.

Bahia Honda State Park - Florida Keys - YouTube

12-07-2012, 09:01 PM
 14,111 posts, read 22,793,456 times Reputation: 4214
While Miami may not be tropical, I think it's no debate that The Keys are tropical.

12-07-2012, 09:55 PM
 654 posts, read 1,297,533 times Reputation: 276
Quote:
 Originally Posted by polo89 While Miami may not be tropical, I think it's no debate that The Keys are tropical.
Coastal Miami and Miami Beach and the Keys have the same plant hardiness zone: 11A+ The rest of South Florida have 10B or lower. I think only the areas in South Florida with a 11A+ zone is tropical. So, that means Miami/Miami Beach/Key Biscayne and the Keys.

Fort Lauderdale, WPB, Stuart, Naples, Fort Myers, Homestead, Oasis, Everglades, W. Perrine, Kendall, Boca, do not house 11+ PHZ. So, IMO it's semitropical like Honolulu. Honolulu is a semi tropical steppe while coastal eastern south Florida from WPB to Lauderdale is a semitropical rainforest climate, since neither has a dry month.

I welcome Hilo into the tropical community however. It is a true tropical climate, and a rainforest at that. It's good to know America has every type of tropical climates available. We are very versatile when it comes to tropical climates:

Pago Pago - ultra tropical rainforest
Hilo - tropical rainforest
Miami/Miami Beach - tropical monsoon
Key West - tropical savanna
Fort Lauderdale/WPB - subtropical rainforest
Honolulu - semitropical steppe

12-08-2012, 11:35 AM
 Location: 9851 Meadowglen Lane, Apt 42, Houston Texas 3,178 posts, read 1,698,370 times Reputation: 368
I hate these climatologist definitions. Anyone whose been to Honolulu will call it tropical lol. From the vegetation and the climate. It gets less rain, so what?
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