After slipping to a low last week, CBS drama “Under the Dome” held steady last night and was easily Monday’s top series in key demos.

According to preliminary national estimates from Nielsen, “Under the Dome” averaged a 2.4 rating/7 share in adults 18-49 and 10.3 million viewers overall — matching last week’s averages. The show delivered its best local-market rating in New York (a 2.15 in adults 18-49) since before the start of the Time Warner blackout, which is limiting viewership of the network in Gotham as well as Los Angeles and Dallas.

“Dome” again had to build sharply from its lead-in, as CBS fared modestly from 8 to 10 p.m. with repeats of “How I Met Your Mother” (0.9/3 in 18-49, 3.8 million viewers overall), “Mike & Molly” (0.9/3 in 18-49, 4.0 million viewers overall), “2 Broke Girls” (1.0/3 in 18-49, 4.2 million viewers overall) and “Mike & Molly” in its regular timeslot of 9:30 (1.0/3 in 18-49, 4.5 million viewers overall).

There wasn’t much else happening on the major networks Monday, with NBC’s “American Ninja Warrior” the No. 2 program among young adults (1.5/5 in 18-49, 5.0 million viewers overall), though down a tick from last week. It was followed by “Get Out Alive With Bear Grylls” (1.2/3 in 18-49, 3.5 million viewers overall), which was down 14% (0.2) from last week to match its low but did beat out its Big Four repeat competition in 18-49. And at 10, “Siberia” (0.7/2 in 18-49, 2.0 million viewers overall) was on par with last week.

At ABC, special off-night repeats of “Shark Tank” (1.0/3 in 18-49, 4.5 million viewers overall) and “Castle” (0.7/2 in 18-49, 3.8 million viewers overall) were followed by drama “Mistresses” (1.0/3 in 18-49, 3.5 million viewers overall), which matched its low as it returned following two weeks of preemptions. Still, “Mistresses” has provided ABC with strong timeslot improvement over last year and continues to be a good performer in DVR playback.

Fox aired repeats of comedies “Raising Hope” (0.7/2 in 18-49, 1.9 million viewers overall at 8 p.m. and 0.6/2 in 18-49, 1.5 million viewers overall at 8:30 p.m.), “New Girl” (0.7/2 in 18-49, 1.5 million viewers overall) and “The Mindy Project” (0.7/2 in 18-49, 1.5 million viewers overall).

Preliminary 18-49 averages for the night: CBS, 1.4/4; Univision, 1.3/4; NBC, 1.1/3; ABC, 0.9/3; Fox, 0.7/2; Telemundo, 0.5/2; CW, 0.2/1.

In total viewers: CBS, 6.2 million; ABC, 3.9 million; NBC, 3.5 million; Univision, 3.4 million; Fox, 1.6 million; Telemundo, 1.2 million; CW, 0.7 million.