0°C at 0°Longitude

It's (even colder than) 0°C and Camel is at 0° Longitude
Location: Greenwich Observatory Hilltop, London, England

That's where they define some standards - not only for geography, also for lengths, there even is a STANDARD CAMEL!!!

When there's snow in London everything is getting stuck in the snow, trains, cars - even a camel.

Yes, this really is London
Background: Tower Bridge - What else...

 Biiig Ben