NEW YORK — The major league batting average jumped to .246 in June amid a crackdown by the commissioner’s office on foreign substances utilized by pitchers, raising the season average to .239.

The season average is the lowest through June since it was .233 in 1968, the Elias Sports Bureau said Thursday. That was the last season before the pitcher’s mound was lowered.

Hitters batted .232 in April and .239 in May. The June average was closer to recent levels, down from .245 in 2018.

Major League Baseball officials began saying on June 3 that they intended to start stricter enforcement against the use of sticky substances used by pitchers to improve grips and spin rates, and umpires started checking all pitchers on June 21.

The average fastball spin rate in June was 2,257 revolutions per minute, according to MLB Statcast, down from 2,323 in May and 2,313 in April. That left the season average at 2,298.

Velocity was basically unchanged, with fastballs averaging 93.8 mph in June, up from 93.7 mph in May and 93.6 mph in April for a season average of 93.7 mph.

Seattle Mariners pitcher Héctor Santiago became the first player disciplined as part of the crackdown, given a 10-game suspension Tuesday. Santiago and the team have denied wrongdoing after umpires found a sticky spot in his glove.

Runs per team per game averaged 4.36 through June 2 and 4.64 since, and the batting average was .236 through June 2 and and .246 since. Strikeouts dropped to 23.2% of plate appearances from 24.2% and home runs increased to 3.4% from 3.1%.

Part of the uptick may be due to offense usually increasing as weather warms.

On-base percentage and slugging percentage rose, too.