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Scotland is icy cold. Everyone knows that. And that's why they fermented their beer so cold.

How much colder would you expect the ambient temperature to be in Edinburgh than London? If they fermented 10º F cooler, that seems a reasonable guess. 10º F is about 6º C. The biggest monthly difference is actually 5.5º C.

Here's an easy-to-understand table:



Average temperature by month (º C)
Jan Feb Mar Apr May June July Aug Sept Oct Nov Dec
London 6.5 7 9 11 14 17 19 19.5 16.5 13.5 9.5 6.5
Edinburgh 3.5 3.5 5 6.5 9.5 12 13.5 14 12 8.5 6 3
difference -3 -3.5 -4 -4.5 -4.5 -5 -5.5 -5.5 -4.5 -5 -3.5 -3.5
Source:
MSN News and Weather

But here's something even more intriguing. The difference in temperature between Edinburgh and Burton:


Average temperature by month (º C)
Jan Feb Mar Apr May June July Aug Sept Oct Nov Dec
Burton 4 4.5 6.5 8 11.5 14 16.5 16.5 14 11.5 6.5 5
Edinburgh 3.5 3.5 5 6.5 9.5 12 13.5 14 12 8.5 6 3
difference -0.5 -1 -1.5 -1.5 -2 -2 -3 -2.5 -2 -3 -0.5 -2
Source:
MSN News and Weather


Not a huge difference, is there? So why didn't they ferment cold in Burton?


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