The effect of clear and cloudy days, and of days with large and small temperature ranges on the daily pressure variation at Bermuda is investigated. It is shown that the various harmonic components are not significantly affected by the different weather conditions contrary to what has been found for continental stations. Such an independence from the local weather situation is to be expected over the oceans, especially in the case of the semidiurnal pressure oscillation. The results strengthen the explanation given by Chapman for the occurrence of the semidiurnal pressure maximum two hours before solar transit through the meridian.

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