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In Cy49 and later, re-forecasts are made every four days during each month on 1/5/9/13/17/21/25/29 (excluding 29 February).  There remain problems using each newly updated M-climate, particularly in spring and autumn when mean temperatures change most rapidly day by day. 

Running on fixed days of the month allows direct comparison between re-forecasts produced at different resolutions and/or in different years.

In Cy48 and earlier the the reforests were run twice per week with M-climate updates on Mondays and Thursdays.  There were problems using each newly updated M-climate, particularly in spring and autumn when mean temperatures change most rapidly day by day. 

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