About half of New York City voters approve of the job that Bill de Blasio is doing as mayor and roughly the same amount view him favorably, according to a New York Times/NY1/Siena College poll released Monday.

As de Blasio prepares to mark 100 days in office Thursday, 49% of voters approve of his job performance while 34% disapprove.

He enjoys a 48% favorability rating, though 26% of voters view him unfavorably and 25% say they don't know enough about him to form an opinion.

"Many New Yorkers have not yet formed a firm impression of the new mayor," said Siena pollster Steven Greenberg. "By and large, these numbers show there are more New Yorkers who approve of him, like him and support the job that he's doing than those that don't, but the jury is still out."

The poll showed 15% of voters believe New York made a mistake in electing de Blasio, 26% like what they see from him so far and 59 percent say it's too early to tell.

Siena surveyed 941 registered voters between March 29 and April 3 for the poll, which has a margin of error of plus or minus 3.2 percentage points.

Siena's last poll on de Blasio in December, before his inauguration, didn't ask voters about his job performance, but helped to show that his favorability has risen 7 percentage points between December and now.

A poll conducted by Quinnipiac University last month showed de Blasio had a 45% job approval rating and another by Marist College at the start of March found he had a 39% approval rating.