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@EB
I found this via Google, therefore it must be true:
In the UK the expression "It's too cold for snow" is true.
In the UK the lowest temperatures are associated with high pressure systems and clear skies. The clear skies are because of the lack of humidity and the clear skies lead to rapid radiation cooling, hence the very low temperatures and no snow.
Moisture comes in on a maritime airstream from the west or southwest associated with low pressure systems. Because this comes both from warmer latitudes and from passing over warm seawater, the air temperatures rise. As it meets colder continental air, the moisture condenses and falls as rain, or if the temperature is cold enough, as snow.
Most snow therefore falls in the UK when the temperature is just a degree or two below zero. Much colder than that and you are most probably enjoying high pressures and clear skies (and no snow).