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Old 09-19-2019, 04:55 PM
 
50 posts, read 37,012 times
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Quote:
Originally Posted by Thunder98 View Post
Wow how is there 300 hours difference yearly just crossing the river?
Which one is true and false. Maybe both figures are fake. Such innacurate information. Ridiculous
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Old 09-19-2019, 04:58 PM
 
2,116 posts, read 1,720,169 times
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Quote:
Originally Posted by veeman123 View Post
Wow how is there 300 hours difference yearly just crossing the river?
Which one is true and false. Maybe both figures are fake. Such innacurate information. Ridiculous
They are both technically true they just use different systems to measure. The Canadian one uses(used?) the system the rest of the world uses.
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Old 09-19-2019, 05:05 PM
 
50 posts, read 37,012 times
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Detroits sunshine info. So Windsors sunshine and weather should be the same since they are right accross the river from each other right?

https://en.m.wikipedia.org/wiki/Detroit
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Old 09-23-2019, 12:46 AM
 
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Quote:
Originally Posted by fluffydelusions View Post
They are both technically true they just use different systems to measure. The Canadian one uses(used?) the system the rest of the world uses.
But it shows 300 hours less in ssmarie canada. How can both be correct.
Most of canadas reading instruments are disconnected or way outdated. Theres only a few stations collecting sunshine
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Old 09-23-2019, 01:09 PM
 
29,428 posts, read 19,515,213 times
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Quote:
Originally Posted by veeman123 View Post
But it shows 300 hours less in ssmarie canada. How can both be correct.
Most of canadas reading instruments are disconnected or way outdated. Theres only a few stations collecting sunshine
Detroit and Amercan locations used until 1996 the Foster sunshine recorder while Canada and Europe used the Campbell Stokes device. The device used in the US was more accurate but began recording at 88watts while the Campbell Stokes had to be manually set and began at 120watts.

https://journals.ametsoc.org/doi/abs...-0477-34.5.212

There are many disadvantages with the Campbell Stokes. For example, when the sun is low in the sky it may not have enough strength to properly burn the card and thus can only measure the amount of bright sunshine as opposed to visible sunshine. This often occurs at dawn and dusk. Rain may cause the card to be torn when removing it and thus making it difficult to read. In areas of high frost and during periods of freezing rain the sphere may be difficult to clean and may not be removed before the sun is shining again. However, the single biggest problem is in the reading of the cards. On days when the sun is alternately covered and exposed by clouds, the amount of burn on the card may be the same for 30 seconds as for 5 minutes. Thus, the reading of the card may differ from one observer to another.

Neither weather service in the US or Canada record sunshine hours anymore. Only site in the US that I know of that still does is Midway airport in Chicago. Many countries now use the Kip Zonnen device but that too has shown to measure the amount of sunshine quite differently from other instruments
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Old 09-23-2019, 07:23 PM
 
Location: Wellington and North of South
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All systems have their drawbacks. I object to the concept of a fixed cutoff which takes no account of seasonality or time of day. I think that if it were feasible the sunniness of a time interval would be assessed against a threshold for that time which allowed for the above. Obviously any site would need some profile data for the latitude/season/time of day to be used as the benchmark for it. As it is, in my country the KZ instruments using the standard 120W cutoff can register bright sunshine on summer days with hazy cloud cover, while sunny intervals in winter can miss out.
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Old 09-24-2019, 12:21 PM
 
Location: Portsmouth, UK
13,450 posts, read 8,987,949 times
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Quote:
Originally Posted by veeman123 View Post
Detroits sunshine info. So Windsors sunshine and weather should be the same since they are right accross the river from each other right?

https://en.m.wikipedia.org/wiki/Detroit
No the other way round, Detroit should actually be about the same as Windsor.
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Old 09-26-2019, 11:04 PM
 
50 posts, read 37,012 times
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Quote:
Originally Posted by flamingGalah! View Post
No the other way round, Detroit should actually be about the same as Windsor.
Hows it the other way around?
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Old 09-27-2019, 04:49 AM
 
Location: Portsmouth, UK
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Quote:
Originally Posted by veeman123 View Post
Hows it the other way around?
Because it is the US sunshine stats that are inflated.
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Old 06-04-2020, 06:54 AM
 
Location: Sydney, Australia
11,645 posts, read 12,868,126 times
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Quote:
Originally Posted by ChesterNZ View Post
We can get some idea by examining sunshine figures for nearby climates in other countries. In the case of Miami we have Nassau with 2900 hrs and Havana with 3000. For San Diego nearby Tijuana claims 3000 hrs. So I don't think they're overstated by much.
Old post, but maybe Mexico uses America's system of sunshine measurement as well?

I suspect that South Africa does so as well. I mean, Cape Town, which is a very oceanic influenced Med climate that faces the Southern Ocean, has 3,000 hours of sunshine annually. And Port Elizabeth, also on Southern Ocean, has an oceanic climate with 2,800 hours of sunshine annually. Something doesn't seem so right. If these places were in South Australia, they'd range between 2,600 and 2,700 hours at most.
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