"The climatological network consists of approximately one station for each 625 square mile area. This network density provides a good representation of the macro or large-scale climate in Michigan. Because the climatic parameters change more rapidly near the Great Lakes, some care must be exercised when applying th edata from a single point to a larger area. The station history provides background about the exposure of the observation site as an aid in evaluating the representativeness of the data to the surrounding terrain. As additional stations accumulate sufficient length of record, these summaries will be developed for future publications...."--Preface.