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Unread 06-23-2008, 07:01 PM
 
Location: Perth, Western Australia
9,597 posts, read 13,998,325 times
Reputation: 3190
Default How much difference in sunlight do you get annually?

I just realized today that Toronto gets approximately 40 times as much sunlight energy in summer than in winter.

How did I get this?

Well Toronto's U.V. in mid-winter on the brightest day is only 0.9,
but in summer the U.V. is typically 8-9.

In winter we average 2-3 hours of sunlight a day,
But summer, with 40% average cloud cover and 15 hours of daylight,
roughly 8-9 hours of sunlight.

So Toronto gets ten times the U.V. and four times as much hours of sunlight in summer.

*Just for grins, would anyone else like to find and compare annual sunlight levels?

** Maybe all this "extra" sun energy is why I don't mind it being cooler than I'd prefer.
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Unread 06-23-2008, 08:30 PM
 
Location: Subarctic maritime Melbourne
5,060 posts, read 2,707,399 times
Reputation: 2836
Our winter UV is about 2, in summer it's 12 or 13.

average winter daily sunshine is about 4 hours

average summer daily sunshine 8-9 hours.
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Unread 06-23-2008, 08:55 PM
 
Location: Seattle
2,562 posts, read 3,990,223 times
Reputation: 997
January - 2
February - 4
March - 5
April - 7
May - 8
June - 8
July - 10
August - 8
September - 7
October - 4
November - 3
December - 2

BBC - Weather Centre - World Weather - Average Conditions - Seattle

Last edited by Botev1912; 06-23-2008 at 09:19 PM..
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Unread 06-24-2008, 06:48 PM
 
Location: Perth, Western Australia
9,597 posts, read 13,998,325 times
Reputation: 3190
Quote:
Originally Posted by §AB View Post
Our winter UV is about 2, in summer it's 12 or 13.

average winter daily sunshine is about 4 hours

average summer daily sunshine 8-9 hours.
At least your sunshine hour get cut in half for winter.

*No wonder many people get SAD here.
*I don't get SAD, but it does seem bizarre the contrast between summer and winter for light levels... even fall to summer.

Daylight hours in winter is about 8 hours, summer is about 15.5 hours.
Based on this, clear skies are at least twice as common in summer versus winter.
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Unread 04-03-2014, 12:12 AM
 
Location: Sydney, Australia
1,071 posts, read 194,407 times
Reputation: 294
In summer we can get as high as 13-14.

In winter we hover around 3-4.
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Unread 04-03-2014, 01:04 AM
 
Location: Wellington and North of South
3,952 posts, read 2,418,787 times
Reputation: 1633
Quote:
Originally Posted by theropod View Post
In summer we can get as high as 13-14.

In winter we hover around 3-4.
Eh? At Sydney Aero June mean is 6.0, July 6.6 and August 7.8, with August being the relatively sunniest month of the year with 72% of the astronomically possible ...
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Unread 04-03-2014, 01:13 AM
 
Location: North West Northern Ireland.
17,070 posts, read 4,780,735 times
Reputation: 2655
12 hours
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Unread 04-03-2014, 01:15 AM
 
Location: North West Northern Ireland.
17,070 posts, read 4,780,735 times
Reputation: 2655
Quote:
Originally Posted by §AB View Post
Our winter UV is about 2, in summer it's 12 or 13.

average winter daily sunshine is about 4 hours

average summer daily sunshine 8-9 hours.
Now please do not have the audacity to ever rant about winter daylight hours!

You do NOT have short or even winter days. I have just 7 hours of daylight in winter. Take that and smoke it.
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Unread 04-03-2014, 06:34 AM
 
Location: Göteborg, SWE
1,445 posts, read 361,792 times
Reputation: 583
couldn't find any good data on this.

from SMHI:s homepage
"During summer, the UV index in Sweden is 4-7 and during the dark season (Nov-Feb) usually below 2"
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Unread 04-03-2014, 06:38 AM
 
Location: Turku, Finland
5,711 posts, read 1,774,098 times
Reputation: 2365
Quote:
Originally Posted by kronan123 View Post
couldn't find any good data on this.

from SMHI:s homepage
"During summer, the UV index in Sweden is 4-7 and during the dark season (Nov-Feb) usually below 2"
Above some 52 degrees the lowest UV is in midwinter less than 0.5. UV 1 will reach Longyearbyen during these next days.
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