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Will it be frosty in Portsmouth?

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The frost forecast percentage is generated by combining data from different computer models.

The frost calculation is based on runs forecasting temperatures to fall to or below 0C. Ground frost is considered possible at 3.5C or lower.

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A huge range of charts and data is freely available.

Models include UK Met Office UKV and MOGREPS-G, ECMWF, NCEP GFS, Meteo France Arpege and Arome.