The 24-year-old made the move to north London last summer for a reported £16million fee.
And the striker says he couldn't be happier with the move, admitting the facilities and staff at the club have improved his game.
He said: "It's been transitional for me, moving down to London, playing in a new system for a new manager and a new team, getting used to new things around the club.
"There's a good group of lads and everyone's been class with me since the day I arrived and it's not just my teammates, it's the staff around the training ground, at the stadium, everyone.
"It's not just one thing [that has improved]. My all-round game, getting used to the different systems and different players means you learn a lot more, gather more experience and you just develop naturally."
Welbeck has played 27 league games for the Gunners this season, scoring four times and supplying three assists.