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Old 12-21-2012, 01:47 PM
 
Location: London, UK
9,970 posts, read 12,351,742 times
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Quote:
Originally Posted by Joe90 View Post
So the temperatures are warmer inland then?
How can it be warmer inland, funny
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Old 12-21-2012, 01:50 PM
 
Location: London, UK
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Quote:
Originally Posted by owenc View Post
It was -1f here on 23rd december 2010.. 18f is not brutal lol.
Brutal ish still cold. Anything below 0c is cold below -8c thats freezing cold. But I know how to dress for cold temps...
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Old 12-21-2012, 01:54 PM
 
Location: North West Northern Ireland.
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Well, 2010 kind changed my view on what is cold.

When we had -9c maxes I kinda realised that 0c really isn't that cold.
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Old 12-21-2012, 01:55 PM
 
Location: London, UK
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Quote:
Originally Posted by owenc View Post
I'm only off on my Christmas holidays, its Friday night maybe after Christmas.
You study meteorology?
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Old 12-21-2012, 01:57 PM
 
Location: North West Northern Ireland.
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No. I was thinking of doing it.

But maybe not. I'm doing A levels.
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Old 12-21-2012, 01:58 PM
 
Location: Top of the South, NZ
22,216 posts, read 21,582,380 times
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Quote:
Originally Posted by P London View Post
How can it be warmer inland, funny
You are missing the irony. Owenc is presenting a scenario that doesn't add up and won't make the effort to explain it.
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Old 12-21-2012, 02:00 PM
 
Location: Crieff, Scotland 56.4N 3.8W
486 posts, read 559,669 times
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Northern Ireland isn't cold, not even by UK standards

I don't consider where I live to be cold, either.
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Old 12-21-2012, 03:29 PM
 
Location: London
775 posts, read 1,166,294 times
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Quote:
Originally Posted by Rozenn View Post
The coldest it gets in an average winter at Orly airport is -8.1°C/17.4°F. Average coldest high is -2.3°C/27.9°F.

Last few winters lows (since 2007):
2007/2008 -7°C (19°F)
2008/2009 -13°C (10°F)
2009/2010 -13°C (8°F)
2010/2011 -8°C (18°F)
2011/2012 -10°C (15°F)


The extremes since 1945:
Lowest min: -16.8°C/1.8°F (17/01/1985)
Lowest max: -10.8°C/12.6°F (16/01/1985)

For downtown, at Montsouris station (since 1873):
Lowest min: -23.9°C/-11°F (10/12/1879)
Lowest max: -11.5°C/11.3°F (20/01/1938)




Sounds perfect to me! Where do you live in Finland?
I was expecting lower coldest nights at Orly airport. Is that the 1981-2010 averages? I read somewhere that the 1879 Montsouris record is probably not accurate - it has been "corrected" at something like -16C instead, because non-standard thermometers were in use until the 1920s (no screen etc...). This would make sense given that even Orly only went down to -16.8C in 1985.
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Old 12-21-2012, 03:38 PM
 
Location: London
775 posts, read 1,166,294 times
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Quote:
Originally Posted by ChuckG2008 View Post
I was just saying that it's interesting because Atlanta's average January low ranges from 34F to 35F, and London's January low is almost exactly the same, at 36F for the entirety of the month.
Although, I concede that London is colder overall than Atlanta (of course that's to be expected when comparing London to a city at the same latitude as Baghdad!). London's daytime highs during the winter are mostly in the 40s, while Atlanta can experience spikes to above 60F during the winter, and Atlanta's average highs are around 52F.

That gulf stream is a HUGE plus for a country so far outside of the tropics!
Atlanta has more severe freezes than London on average, but it can also go over 20C in winter which would never happen here.
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Old 12-21-2012, 04:30 PM
 
Location: Paris
8,161 posts, read 8,711,006 times
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Quote:
Originally Posted by Superluminal View Post
I was expecting lower coldest nights at Orly airport. Is that the 1981-2010 averages?
Yup these are the 1981-2010 averages. Shows how ridiculously mild our winters are, eh?



Quote:
I read somewhere that the 1879 Montsouris record is probably not accurate - it has been "corrected" at something like -16C instead, because non-standard thermometers were in use until the 1920s (no screen etc...). This would make sense given that even Orly only went down to -16.8C in 1985.
Yes measures back in the 19th century weren't as accurate as today, that's for sure. Though putting a 8°C correction sounds extreme to me.
Also the 1985 coldwave wasn't nearly as strong as 1879 as the Seine didn't ice over (there were only small pieces of ice floating on the surface from what I've read), whereas one could cross it by feet for three weeks in 1879. The banks of the Seine have been artificialized a lot since then but I don't think it explains the whole difference. 1879 had near-perfect synoptics for intense cold: a snowstorm dumping almost a foot of snow followed by a continental anticyclone bringing calm weather and thus optimal conditions for low-layer cold. There wasn't nearly as much snow on the ground in 1985, unfortunately.


Nothing like this in 1985





Btw the -16.8°C reading is indeed disappointing. I would've expected Orly to dip lower than that. The difference with the downtown station wasn't really big (-13.9°C at Paris-Montsouris that night). Northern suburban Le Bourget did better, down to -18.2°C. I guess there was a light northern breeze bringing the warmth of the city over the southern suburbs. Btw, Saint-Arnoult, a frost hollow located about 40 km southwest of Paris, reached -28°C that night. Kinda our local Benson.
I think Orly is a bit affected by the UHI, as it's completely surrounded by suburban communities. In January 2010, Orly recorded a -13.3°C low while Brétigny, farther out in the southern suburbs, dipped to -20.6°C.
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