In that time, the Gunners have conceded just 10 goals and the Czech Republic captain believes the improvement has been made possible thanks to a combined defensive effort from those in a red shirt.
"I wouldn't pick out one particular part, it's the whole team that has defended better and hopefully we can continue to do that," Rosicky told the club's official website.
"Sometimes when new faces come in you need time to gel and I think the last month was much better from us.
"We were good in defence and much more compact, and I think we will show that in the coming months as well."
In stark contrast, Arsenal let in 18 goals in 9 matches prior to their positive run indicating that Rosicky could be onto something.