Since it seems highly improbable that natural processes which induce rainfall are related to the days of the week, I suggest that Mr Nicholson seeks an interpretation in terms of manmade effects. The low Sunday value may be a clue that the working week could have a bearing on it. Summarising the rainfall over 39 years may obscure trends that a more detailed study would reveal. It might be worthwhile to look at public holidays; the possible effects of seasons could also be examined. In addition, he might consider whether there are local industrial sources of discharges to air which could conceivably affect the rainfall at his point of measurement.
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