RESEARCH: Monthly Park Effects

Introduction
It’s May, and spring has arrived across North America. Ballparks are heating up, and as they do, baseballs are flying further. The seasons also bring changes in wind patterns and humidity, each of which also affects batted balls. But how much? And do the differences in the baseball’s “carry” explain the differences in the deserved-HR park factors? Today we’ll find out.

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  For more information about the terms used in this article, see our Glossary Primer.