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Great Barrier Island climate
Posted: Mon 01/11/2021 19:53
by wembley
I read online that Great Barrier Island's climate was warmer than Auckland's due to being slap bang in the middle of the local warm ocean current. If that is the case, would GBI's climate be a true humid subtropical one (Cfa) under Koppen?
Re: Great Barrier Island climate
Posted: Thu 04/11/2021 03:19
by Willoughby
It seems by a 30-year average, it's warmest month February is just not warm enough (needs a temp average of 22°C minimum in the warmest month):
https://www.weatherbase.com/weather/wea ... 099&units=
However, with recent warming trends over the last few years, it could very well have made it to a Cfa climate. Though I would hazard a guess it'd be easier for some east Auckland stations to get there with higher day time temps, but still warm night time temps (Mechanics Bay etc).
Re: Great Barrier Island climate
Posted: Fri 05/11/2021 13:52
by Nev
^ Note that the Port Fitzroy figures shown on that link look to be based on NIWA's 1981-2010 averages, with the obvious exception of its way too low average monthly and annual rainfall figures (all exactly 27.8% of what they should be).
Port Fitzroy on the island's west coast is also unfortunately the only site NIWA has that includes temp records, and they only range from 1961 to 2003, with quite a few days of missing data, particularly in the latter years. It does, however, have several other historical rainfall sites around the island.
Below are the correct rainfall figures and some mean temp comparisons with Auckland Aero:
Code: Select all
Port Fitzroy vs. Auckland Aero - 1981-2010 averages
Site Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Annual
Rainfall mm
NZAA 66.1 71.3 75.1 85.0 109.6 107.7 133.1 110.8 90.5 93.9 71.7 86.6 1101.4
Fitz 111.8 128.1 141.7 133.6 144.6 180.1 223.1 186.4 139.8 115.4 120.0 115.1 1739.7
Tmean °C
NZAA 19.8 20.3 18.8 16.3 14.0 11.8 10.9 11.6 13.0 14.5 16.2 18.3 15.5
Fitz 19.4 19.9 18.7 16.6 14.8 12.7 11.9 12.2 13.3 14.6 16.2 18.1 15.7
There's also a fairly reliable 3-year-old
PWS at Claris Aero near the island's southern east coast that I often check, but again, it only looks to be very marginally warmer than Auckland Aero.