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July 2012 Departure Thread - DCA


MN Transplant

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01 88 70 Normal temp 79.0 Actual temp 99 77 88.0 Departure 9.0
02 88 70 Normal temp 79.0 Actual temp 95 79 87.0 Departure 8.0
03 88 70 Normal temp 79.0 Actual temp 98 75 86.5 Departure 7.5
04 88 71 Normal temp 79.5 Actual temp 99 75 87.0 Departure 7.5
05 88 71 Normal temp 79.5 Actual temp 100 80 90.0 Departure 10.5
06 88 71 Normal temp 79.5 Actual temp 100 81 90.5 Departure 11.0
07 89 71 Normal temp 80.0 Actual temp 105 82 93.5 Departure 13.5
08 89 71 Normal temp 80.0 Actual temp 102 77 89.5 Departure 9.5
09 89 71 Normal temp 80.0 Actual temp 87 74 80.5 Departure 0.5
10 89 71 Normal temp 80.0 Actual temp 90 72 81.0 Departure 1.0
11 89 71 Normal temp 80.0 Actual temp 89 73 81.0 Departure 1.0
12 89 71 Normal temp 80.0 Actual temp 88 72 80.0 Departure 0.0
13 89 71 Normal temp 80.0 Actual temp 90 75 82.5 Departure 2.5
14 89 71 Normal temp 80.0 Actual temp 88 71 79.5 Departure -0.5
15 89 71 Normal temp 80.0 Actual temp 96 76 86.0 Departure 6.0
16 89 71 Normal temp 80.0 Actual temp 96 76 86.0 Departure 6.0
17 89 71 Normal temp 80.0 Actual temp 100 77 88.5 Departure 8.5
18 89 71 Normal temp 80.0 Actual temp 101 80 90.5 Departure 10.5
19 89 71 Normal temp 80.0 Actual temp 95 75 85.0 Departure 5.0
20 89 71 Normal temp 80.0 Actual temp 82 71 76.5 Departure -3.5
21 89 71 Normal temp 80.0 Actual temp 71 67 69.0 Departure -11.0
22 89 71 Normal temp 80.0 Actual temp 82 70 76.0 Departure -4.0
23 88 71 Normal temp 79.5 Actual temp 90 75 82.5 Departure 3.0
24 88 71 Normal temp 79.5 Actual temp 93 74 83.5 Departure 4.0
25 88 71 Normal temp 79.5 Actual temp 89 72 80.5 Departure 1.0
26 88 71 Normal temp 79.5 Actual temp 100 74 87.0 Departure 7.5
27 88 71 Normal temp 79.5 Actual temp 95 77 86.0 Departure 6.5
28 88 71 Normal temp 79.5 Actual temp 97 74 85.5 Departure 6.0
29 88 71 Normal temp 79.5 Actual temp 90 72 81.0 Departure 1.5
30 88 71 Normal temp 79.5 Actual temp 89 75 82.0 Departure 2.5
31 88 71 Normal temp 79.5 Actual temp 90 74 82.0 Departure 2.5

	 Monthly average 93.1 74.9 84.0

 Record monthly temperature 84.5
 Temps needed to tie record (rest of month) xxx
 Temps needed for 2nd warmest July xxx

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Our norms are pretty silly probably. I understand norms are over 30 years and smoothed but they aren't very relevant. Almost of of July should be 90/72 with a 10-15 day period of 91/73. I think we've hit 71 or lower like 2-3 times in the last 30 days or so.

Two days in July with lows below normal. River/UHI/pattern all to blame probably. Easy to say that the normals aren't relevant coming off of a trifecta of the warmest summers on record, though. Tougher to make the case that this is the new norm. I'm hoping this is just a string of suck related to the overall decadal patterns with some GW built on top. '09 wasn't that bad, and even as close as '04 was a really quite pleasant summer.

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even as close as '04 was a really quite pleasant summer.

Newcomers to the DC area will find this fact hard to believe, but after a high of 98 was recorded at DCA on August 19, 2002, there was nearly a three-year gap of 95+ days -- the next one occurred on July 21, 2005, with a reading of 95 on the nose.

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Newcomers to the DC area will find this fact hard to believe, but after a high of 98 was recorded at DCA on August 19, 2002, there was nearly a three-year gap of 95+ days -- the next one occurred on July 21, 2005, with a reading of 95 on the nose.

I've been here since 1997, and even I find it hard to believe!

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so apparently 1981-2010 90+ day avgs are smoothed as well. how did it take me 2 years to figure that one out? im not sure i get it either.

our yrly avg dropped 6 to 31??

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I think that is >90 versus >=90

EDIT: yeah..that's what it is

according to their descriptor file it includes 90

grthNNN = greater than or equal to NNN whole degrees Fahrenheit

NNN can be 040,050,060,070,080,090,100

BUT -- NOWDATA has the numbers I/you have

post-1615-0-54058400-1343873493_thumb.gi

either way I'm not sure how we'd have lost 6 90+ in the new norms with a difference of 11 days 90+ (1971-2000 higher) over 30 yrs.

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Smoothing on certain things is dumb IMO. Of course I don't really know much about higher level stats. If the new number is close to the median I guess it is fine. Is it higher than the median? If so I guess I am ok with it.

I'm just confused now with two conflicting sets. I don't really think a hard count of days over or under a certain temp should be smoothed so id lean toward an avg. Of course the fact that they don't share their methodology makes it more problematic with smoothed norms.

Ill have to look re: median.

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I think the really lean years hurt us and probably got touched less. Their methodology kind of f-ucks us. I think it is the same reason Feb 2003 and 2010 basically got tossed because we couldnt have these really freaky daily and monthly norms.

Probably tho I'd hope they toss a yr with 10 as quick as one with 70. Not a huge fan of smoothing other than dailies tho I sorta understand why they do.

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