1939 MLB Earned Run Average by Team

The Kansas City Monarchs led all of MLB in earned run average in 1939, with 3.15, 0.12 ahead of the Cincinnati Reds. The average across 29 MLB teams is 4.37.

#	Team	League	G	ERA
1	Kansas City Monarchs	NAL	60	3.15
2	Cincinnati Reds	NL	156	3.27
3	Cleveland Bears	NAL	41	3.30
4	New York Yankees	AL	152	3.31
5	St. Louis Stars	NAL	45	3.52
6	St. Louis Cardinals	NL	155	3.59
7	Brooklyn Dodgers	NL	157	3.64
8	Boston Bees	NL	152	3.71
9	Chicago Cubs	NL	156	3.80
10	Chicago American Giants	NAL	63	3.97
11	Newark Eagles	NN2	61	4.06
12	New York Giants	NL	151	4.07
13	Cleveland Indians	AL	154	4.08
14	Homestead Grays	NN2	51	4.15
14	Pittsburgh Pirates	NL	153	4.15
16	Memphis Red Sox	NAL	54	4.27
17	Detroit Tigers	AL	155	4.29
18	Chicago White Sox	AL	155	4.31
	MLB average			4.37
19	Boston Red Sox	AL	152	4.56
20	Washington Senators	AL	153	4.60
21	Baltimore Elite Giants	NN2	47	4.71
22	Toledo Crawfords	NAL	19	4.87
23	New York Black Yankees	NN2	47	5.05
24	Philadelphia Phillies	NL	152	5.17
25	New York Cubans	NN2	31	5.22
26	Philadelphia Athletics	AL	153	5.79
26	Philadelphia Stars	NN2	64	5.79
28	St. Louis Browns	AL	156	6.01
29	Indianapolis ABCs/Atlanta Black Crackers	NAL	8	6.39

A team's total is its players' numbers for the club added up, so a player traded mid-season counts for each team only what he did there. Rates such as ERA and batting average are worked out from the team's summed totals, not averaged across players.