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Why are the monthly temperature (rainfall) grids not equal to the average (sum) of the corresponding daily grids?

April 26, 2017average grids rainfall temperature

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Why are the monthly temperature (rainfall) grids not equal to the average (sum) of the corresponding daily grids?

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The monthly grids were prepared using monthly station data as input and then, later, daily grids were produced using daily station data as input. Hence these were separate interpolation exercises. Comparisons between the monthly grids and the average/sum of the daily grids were carried out, confirming that the largest differences tend to occur over upland areas. However, no adjustments have been made to make the two types of grid equivalent.