The Impact of Temperature on Labor Quality: Umpire Accuracy in Major League Baseball

38 Pages Posted: 17 Jul 2019 Last revised: 5 Jan 2021

Date Written: January 5, 2021

Abstract

Using data from Major League Baseball, I compute an objective measure of the home plate umpire's work quality- the accuracy of his ball and strike calls during a game- and measure how it varies with temperature. I find that an increase in game-time temperature from between 70F and 80F to above 95F decreases an umpire's accuracy by a little less than a percentage point, which is a 5.5% increase in the pitch-calling error rate when evaluated at the mean error rate of 13.3%. Restricting the sample to borderline pitches increases the magnitude of the hot-weather effect on accuracy to over a percentage point. My results indicate that very hot temperatures have a nontrivial, negative effect on the labor supply quality of a highly trained and highly skilled workforce in an important, high-revenue, and high-stakes industry, and suggest that protecting workers from daily variation in temperature can improve labor productivity.

Keywords: temperature, heat stress, labor quality, labor productivity

JEL Classification: Q51, J24, J81

Suggested Citation

Fesselmeyer, Eric, The Impact of Temperature on Labor Quality: Umpire Accuracy in Major League Baseball (January 5, 2021). Available at SSRN: https://ssrn.com/abstract=3421241 or http://dx.doi.org/10.2139/ssrn.3421241

Eric Fesselmeyer (Contact Author)

Monmouth University ( email )

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