MLB Factors & Months

2019 - 2025 league-wide per-game averages

APR (Cold)

MAY (Warm)

JUN (Hot)

JUL (Peak)

AUG (Hot)

SEP (Cooling)

Home RunsHR per game (both teams)Peak: July

Correlation InsightHR production peaks mid-summer tracking ambient temperature. In 2025, the peak shifted to August (2.53/gm) rather than the traditional July peak, though the seasonal arc remains clear. Cal Raleigh (60 HR) and Schwarber (56) drove historic individual numbers.

Apr

2.07

2.181.88

May

2.31

2.522.09

Jun

2.47

2.712.22

Peak Month

Jul

2.63

2.882.34

Peak Month

Aug

2.50

2.762.18

Sep

2.31

2.652.01

Data: FanGraphs / Baseball Reference · 2025 monthly splits from actual game data · 2025 NRFI estimated · 2020 = 60-game season (Jul-Sep)