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I think the results need to include rain/cloud coverage for pubs in the UK.

Yes, if you included this data then you could add notification alerts to your mobile as well:

"It is now sunny in the beer garden of your favourite pub."

"Clear your schedule, there is an 80% chance of it being sunny in your favourite pub between 1pm and 3pm this coming Saturday."

"Clear your schedule, there is a 5% chance of it being sunny in a pub in your city between 8am and midnight this coming Wednesday."