medieval-atlas/introductory/19

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Regional climates To complement this, of more use than the basic rainfall map is that we should keep in mind that climate conspires with soil an index which takes account of both warmth and precipitation geology and topography to favour the east for agriculture, to to bring out where the moisture balance is most and least faconsiderably higher altitudes than in the oceanic west, and as vourable for agriculture. Again, this calculation emphasises far north as Domoch and indeed Orkney. ~f~ Rainfall _ More than 1S00mm (60") Less than 7S0mm (30") Annual potential water deficit Dry Driest ~SOmm q.7smm+ • < 12.Smm: Wettest Atlantic North Sea lAM

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