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These estimates are interpolated from values on a regular
grid derived from station observations. Where relevant
and possible the effects of altitude, urban areas and
proximity to the coast are taken into account.
Local effects are not taken into account in producing
these estimates. As a general rule this makes them less
accurate in mountainous areas. In particular, days of
thunder, hail, snow falling and snow lying may be unreliable
in sparse data areas such as central and northern Scotland.
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