Where snow has fallen in modern times...

[B1987]

Here is a demonstration of London's heat island.

Average winter temperatures for Central London:

Dec: 8.6C / 5.4C
Jan: 8.5C / 5.1C
Feb: 8.9C / 4.8C

Average winter temperatures for Heathrow Airport (15mi/24km west of centre).

Dec: 8.3C / 3.6C
Jan: 7.9C / 2.8C
Feb: 8.4C / 2.7C

[nei]

this page gives the chances of a white thanksgiving. If you click on traveling to another city below, it shows the chance of a white thanksgiving in seattle is 0. Oops.

Home :: Northeast Regional Climate Center

[Trimac20]

Originally Posted by B1987

Here is a demonstration of London's heat island.

Average winter temperatures for Central London:

Dec: 8.6C / 5.4C
Jan: 8.5C / 5.1C
Feb: 8.9C / 4.8C

Average winter temperatures for Heathrow Airport (15mi/24km west of centre).

Dec: 8.3C / 3.6C
Jan: 7.9C / 2.8C
Feb: 8.4C / 2.7C

Average for the past year? 5C is absurdly warm, lol.

[B1987]

Heathrow's is for the past 30 years, Central London is for the past 19 years as it hasn't had a weather station for very long.

[Weatherfan2]

Originally Posted by B1987

Here is a demonstration of London's heat island.

Average winter temperatures for Central London:

Dec: 8.6C / 5.4C
Jan: 8.5C / 5.1C
Feb: 8.9C / 4.8C

Those numbers are Waaay over inflated.

1971-2000 average for Greenwich, London:

Dec: 8.8°C / 3.3°C
Jan: 7.9°C / 2.4°C
Feb: 8.2°C / 2.2°C

And the London City Airport figures for the last 22 years, 1988 - 2010:

Dec: 7.5°C / 4.3°C
Jan: 7.7°C / 4.3°C
Feb: 8°C / 4°C

[B1987]

Those numbers are for the Weather Centre in Bloomsbury, right in the heart of the heat island. Greenwich is about 5-7 miles from the centre of London, City Airport even further away.

[ben86]

Originally Posted by B1987

Those numbers are for the Weather Centre in Bloomsbury, right in the heart of the heat island. Greenwich is about 5-7 miles from the centre of London, City Airport even further away.

Oh, Bloomsbury, I used to work there. I'll check it out next time I'm round that way. Those are the temperatures experienced by millions of people, yes, but is it an official site though? I heard the temperatures were taken on a rooftop and so weren't official. Where I live in north London seems cooler, noticeably so today.

[Galilei]

Originally Posted by Trimac20

One of my pet interests is rare snowfall events in places that rarely or virtually never receive snow. I'm pretty familiar with past historical events in Australia, and a few from around the world, some of the most amazing ones I've heard include the 1977 snow in Miami, snow as far south as Tampico, Mexico (near the Tropic of Capricorn near sea-level), snow not too far north of Hong Kong again at sea-level, the supposedly snowfall in Sydney in the 1840s, the 1900 event in Australia where a good third of NSW was covered with snow (outside the highlands snow is rare in NSW).

Following are some of the cities on the absolute borderline of the 'extreme' snow limits:

Miami - no snow until January 20 1977 (also snow in the Bahamas)

Guadalajara, Mexico - i think recently something like 20cm of snow fell, the first since about 1916, that's pretty amazing

A selection of borderline cities:

North America

San Francisco
Los Angeles
Phoenix
Houston
New Orleans
Orlando
Guadalajara
Ciudad Juarez
Mexico City

South America

Santiago
Buenos Aires
Valdavia
Bahia Blanca
La Paz

Europe

Lisbon
Cadiz
Palermo

Africa

Algiers
Casblanca
Cape Town

Asia

Fuzhou
Beirut

Australia

Perth (hills)
Adelaide
Melbourne
Sydney (some suburbs)

Ciudad Juarez receives snow most years, and frosts happen in all winters, it should actually have more but it has very low precipitation in general, the temperature range is similar to central japan.
In the case of Mexico city, it is high enough for some sporadical snow events, it used to be colder and snowier but heat island effect made the city warmer, the mountains around the region receive snow almost every winters.