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Old 05-06-2012, 11:01 PM
 
Location: Mid Atlantic USA
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Sunshine data used to be collected in the US up until the last few years. From what I read, its usefulness has faded. It was mainly used for agricultural purposes. Budget cuts, etc are the reason why it is not collected anymore. NOAA claims that solar radiation is a much more useful data tool. They collect solar radiation using the CRN network. This is a useful site:

U.S. Surface Climate Observing Reference Networks


And then use this site to convert the solar radiation into bright sunshine hours:


Email Template

I emailed NOAA about this and they told me that this is now the only way to get current sunshine data for US cities.
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Old 05-07-2012, 12:42 AM
 
Location: Top of the South (Nelson), NZ
7,776 posts, read 4,136,350 times
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Quote:
Originally Posted by Joe90 View Post
6.7 hrs/40 hrs for the first 6 days. Mostly totally clear days, but Saturday was total overcast under high pressure nonsense. 5.8 hours is the average for May.
Correction -50 hours/8.3 hours for the first 6 days.
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Old 05-07-2012, 01:44 AM
 
Location: Yorkshire, England
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We'll get some more today, but 3.9 hours so far apparently
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Old 05-07-2012, 01:57 AM
 
Location: Leeds, UK
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Total now 23.7 hours averaging 3.9 hours a day, same as Ben! More sun today before the front arrives bringing rainfall. Thereafter it looks cloudy, but milder (weatheronline suggests it will be sunny though, contrary to the BBC forecast)

Last edited by dunno what to put here; 05-07-2012 at 02:24 AM..
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Old 05-07-2012, 12:17 PM
 
Location: Yorkshire, England
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Quote:
Originally Posted by dunno what to put here View Post
Total now 23.7 hours averaging 3.9 hours a day, same as Ben! More sun today before the front arrives bringing rainfall. Thereafter it looks cloudy, but milder (weatheronline suggests it will be sunny though, contrary to the BBC forecast)
No, my 3.9 hours (which is now 4.1) referred to the total sunshine over the first seven days of the month The official Hampstead site does give sun figures but only at month end, so I used an unofficial site from Harrow, in west London:
Monthly Data by Year
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Old 05-07-2012, 12:34 PM
 
Location: Leeds, UK
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Oh, that is very low indeed.
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Old 05-07-2012, 01:29 PM
 
Location: Top of the South (Nelson), NZ
7,776 posts, read 4,136,350 times
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Quote:
Originally Posted by ben86 View Post
No, my 3.9 hours (which is now 4.1) referred to the total sunshine over the first seven days of the month The official Hampstead site does give sun figures but only at month end, so I used an unofficial site from Harrow, in west London:
Monthly Data by Year
An interesting site- so much detail.

What causes the sunshine difference between places like Harrow and Greenwich, when compared to Heathrow. There is quite a difference over a short distance.
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Old 05-07-2012, 01:43 PM
 
Location: Yorkshire, England
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Quote:
Originally Posted by Joe90 View Post
An interesting site- so much detail.

What causes the sunshine difference between places like Harrow and Greenwich, when compared to Heathrow. There is quite a difference over a short distance.
The Harrow figures are probably fairly accurate but are unofficial and only go back 10-12 years, so have to be taken with a pinch of salt when comparing them with the long-standing official sites. I can understand why Greenwich (high 1400s or whatever the new average is) is relatively low because it's near enough to the river for slightly extra fog (plus it's downwind from any city centre pollution), and I can appreciate that Hampstead only gets 1471 hours a year (71-00 averages) because it's a hundred metres higher up, but I don't know enough about the topography of west London to understand why Harrow would be significantly less than Heathrow considering they are probably no more than ten miles apart.
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Old 05-07-2012, 02:29 PM
 
Location: Wellington and North of South
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Quote:
Originally Posted by ben86 View Post
The Harrow figures are probably fairly accurate but are unofficial and only go back 10-12 years, so have to be taken with a pinch of salt when comparing them with the long-standing official sites. I can understand why Greenwich (high 1400s or whatever the new average is) is relatively low because it's near enough to the river for slightly extra fog (plus it's downwind from any city centre pollution), and I can appreciate that Hampstead only gets 1471 hours a year (71-00 averages) because it's a hundred metres higher up, but I don't know enough about the topography of west London to understand why Harrow would be significantly less than Heathrow considering they are probably no more than ten miles apart.
Obstructions at Harrow site?
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Old 05-08-2012, 07:17 AM
 
Location: Eastern Sydney, Australia
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It's times like this when I feel so homesick for Melbourne. Just 16 hrs of sun there ending yesterday (7th) whereas we've had around 59 hours over the same period - absolute filth indeed
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