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Old 01-31-2011, 10:25 AM
 
99 posts, read 277,676 times
Reputation: 76

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The average number of cloudy, partly cloudy, and clear days in Portland is given below.
(National Weather Service: Days Cloudy/Partly Cloudy/Clear)

Cloudy Skies (clouds cover 80-100% of sky)
24 cloudy days in January
22 cloudy days in February
23 cloudy days in March
21 cloudy days in April
19 cloudy days in May
16 cloudy days in June
11 cloudy days in July
10 cloudy days in August
11 cloudy days in September
17 cloudy days in October
24 cloudy days in November
23 cloudy days in December
-------------------------------
227 total cloudy days per year


Partly Cloudy Skies (clouds cover 40-70% of sky)
4 partly cloudy days in January
4 partly cloudy days in February
5 partly cloudy days in March
6 partly cloudy days in April
7 partly cloudy days in May
8 partly cloudy days in June
8 partly cloudy days in July
9 partly cloudy days in August
8 partly cloudy days in September
8 partly cloudy days in October
4 partly cloudy days in November
5 partly cloudy days in December
------------------------------------
71 total partly cloudy days per year


Clear Skies (clouds cover 0-30% of sky)
3 clear days in January
2 clear days in February
3 clear days in March
3 clear days in April
5 clear days in May
6 clear days in June
12 clear days in July
12 clear days in August
11 clear days in September
6 clear days in October
2 clear days in November
3 clear days in December
--------------------------------
67 total clear days per year


Here is another quick video that shows one of the 2 clear days that typically would occur in November:


http://www.youtube.com/watch?v=Biz36...eature=related

Last edited by sunscribble; 01-31-2011 at 10:33 AM..
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Old 01-31-2011, 10:26 AM
 
99 posts, read 277,676 times
Reputation: 76
The average number of cloudy, partly cloudy, and clear days in Portland is given below.
(National Weather Service: Days Cloudy/Partly Cloudy/Clear)

Cloudy Skies (clouds cover 80-100% of sky)
24 cloudy days in January
22 cloudy days in February
23 cloudy days in March
21 cloudy days in April
19 cloudy days in May
16 cloudy days in June
11 cloudy days in July
10 cloudy days in August
11 cloudy days in September
17 cloudy days in October
24 cloudy days in November
23 cloudy days in December
-------------------------------
227 total cloudy days per year


Partly Cloudy Skies (clouds cover 40-70% of sky)
4 partly cloudy days in January
4 partly cloudy days in February
5 partly cloudy days in March
6 partly cloudy days in April
7 partly cloudy days in May
8 partly cloudy days in June
8 partly cloudy days in July
9 partly cloudy days in August
8 partly cloudy days in September
8 partly cloudy days in October
4 partly cloudy days in November
5 partly cloudy days in December
------------------------------------
71 total partly cloudy days per year


Clear Skies (clouds cover 0-30% of sky)
3 clear days in January
2 clear days in February
3 clear days in March
3 clear days in April
5 clear days in May
6 clear days in June
12 clear days in July
12 clear days in August
11 clear days in September
6 clear days in October
2 clear days in November
3 clear days in December
--------------------------------
67 total clear days per year


Here is a timelapse video that shows one of the 8 partly cloudy days that typically would occur in October:


http://www.youtube.com/watch?v=-lnut__8qmI
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Old 01-31-2011, 10:28 AM
 
99 posts, read 277,676 times
Reputation: 76
I hope the last three videos helped folks understand what the cloudy, partly cloudy, and clear sky statistics really mean.

Now moving on to fog...

The number of days with dense fog in Portland is shown below.

DAYS WITH DENSE FOG
4.3 days in January
3.7 days in February
2.4 days in March
1.1 days in April
0.2 days in May
0.1 days in June
0.1 days in July
0.2 days in August
2.7 days in September
7.2 days in October
6.1 days in November
4.9 days in December
--------------------------------
32.9 days with dense fog per year

Here is a timelapse video that shows a foggy Portland motorcycle commute:


http://www.youtube.com/watch?v=CMPhY...eature=related

Last edited by sunscribble; 01-31-2011 at 10:42 AM..
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Old 01-31-2011, 10:40 AM
 
Location: Gresham, OR
254 posts, read 653,206 times
Reputation: 152
How do they rate it if it's cloudly in the morning and then partly cloudy in the evening?

I don't know if we should have the discussion in this thread. They asked for gloomy season pics. That previous link you posted says it's overcast(>90%clouds) skys 62% of the time in Febuary when taken hourly from 1948 to 1995. I think that's the best source we have..

Yes, we all have to drive to work, and work inside. I'm not sure if that's what they wanted. Maybe the videos are good but I can't watch them right now. It looks like the foggy motorcycle one might be : )

Last edited by Ryant; 01-31-2011 at 10:50 AM..
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Old 01-31-2011, 12:46 PM
 
99 posts, read 277,676 times
Reputation: 76
Quote:
Originally Posted by Ryant View Post
How do they rate it if it's cloudly in the morning and then partly cloudy in the evening? I don't know if we should have the discussion in this thread...

That previous link you posted says it's overcast(>90%clouds) skys 62% of the time in Febuary when taken hourly from 1948 to 1995. I think that's the best source we have.
Good question Ryant. My guess is that they used a similar method of taking readings for both studies (for example, taking an hourly scan of the sky). This would give a cloud percentage for each hour of the day. Then you could add all of the readings together to calculate the average cloud percentage for the day. For example, if your morning percentage was 100% clouds, your noon percentage 70% clouds, and your evening percentage 40% clouds, the average percentage would come out to be 70%. In this case, the day would be labeled as Partly Cloudy (with clouds covering 40-70% of the sky). (Of course, in reality they would do more than just three readings per day).

All of the studies I listed came from the same source, the National Weather Service. Both studies came from a similar period of record as well (1948/1951-1995). The main reason there are discrepancies between the two studies is that the latter one uses three categories (cloudy, partly cloudy, and clear) instead of four (overcast, broken clouds, scattered clouds, and clear), with different parameters defining each one.

I used the three category one because "cloudy" and "partly cloudy" seemed like more familiar terms to me and because the information is more compact (provides an easier overview of all of the months at once). If you combine the "overcast" and "broken cloud" percentages for February (62.3% + 16.1%), you actually come up with a percentage (78.4%) that is similar to the 22/28 "cloudy days" statistic (22/28 = 78.6%). That wouldn't really be valid because the parameters aren't the same (>60% vs. >80% cloudy), but you get the idea. The "overcast" statistic is just a stricter parameter (>90%) than the "cloudy skies" statistic (>80%), and I believe that is the reason it comes out lower (at 62%). I think both studies are useful.

Now let's get some more "gloomy season" pics, I'm all for that!

Last edited by sunscribble; 01-31-2011 at 01:05 PM..
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Old 01-31-2011, 01:18 PM
 
Location: Gresham, OR
254 posts, read 653,206 times
Reputation: 152
Does this count? : )


Last edited by Ryant; 01-31-2011 at 01:28 PM..
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Old 01-31-2011, 01:29 PM
 
Location: Gresham, OR
254 posts, read 653,206 times
Reputation: 152
Those are good videos. A friend of mine(the guy in red above) used to take some time lapse from where we worked in a tall downtown building. There was some cool videos of the west hill with fog.
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Old 01-31-2011, 05:09 PM
 
Location: Bay Area - Portland
286 posts, read 521,179 times
Reputation: 355
Quote:
Originally Posted by EnricoV View Post
...But to the subject of the thread ... I really fail to see how anyone can term all these gorgeous photographs as "gloomy" just because the sky is cloudy.
Because it fits the accepted definition?

Definition of GLOOMY
1 a : partially or totally dark; especially : dismally and
depressingly dark <gloomy weather>

I understand many like the gloom, but lets remember that the vast majority of people like blue skies and sunshine.
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Old 01-31-2011, 07:41 PM
 
99 posts, read 277,676 times
Reputation: 76
Quote:
Originally Posted by Ryant View Post
Does this count?
Ryant, that is a great pic. It makes me wish I were there! Your pics do a great job of giving a sense of what people are missing out on when they stay inside on overcast days. Heading to the mountains or heading east is a great way to get away from the heavily overcast skies if you really need a break from them. Maybe you could include how long of a drive your pic would be from Portland so that people have a sense of what all is available a short distance from here. As your other pics have shown, even just getting out in nature (overcast or not) really helps, as overcast can be beautiful too if you keep an open mind.

Let's keep the thread on topic. Anyone else have pics to contribute?

Last edited by sunscribble; 01-31-2011 at 08:14 PM..
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Old 01-31-2011, 08:24 PM
 
Location: Pacific NW
6,413 posts, read 12,138,742 times
Reputation: 5860
Quote:
Originally Posted by Dual Citizen CA-OR View Post
Because it fits the accepted definition?

Definition of GLOOMY
1 a : partially or totally dark; especially : dismally and
depressingly dark <gloomy weather>

I understand many like the gloom, but lets remember that the vast majority of people like blue skies and sunshine.
Thank you, but I do know the definition of gloomy. I fail to see where those gorgeous pictures are either DEPRESSING or DARK. I'd be very interested if you could point me to your poll by which you've determined what "the vast majority" likes? Personally, I do think it's possible for people to like both.
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