The 'Promise This' singer, who is said to be getting ready for a rumoured role on the judging panel of The X Factor USA, explained that the Californian weather makes her "feel alive".
She told Glamour: "I found it a bit overwhelming when I first came here. Everything's a bit spread out and you have to drive everywhere.
"Also, the mentality is really different. It takes a little while to adapt. London is still home though, and I haven't set down roots here. LA is mainly for work and recording.
"But just to have the sunshine, it makes you feel alive. Everyone is a bit more relaxed here too. They just throw on shorts and shirts.
"Nobody really cares that much about how they look because the sun makes you feel so relaxed. You feel a bit out of place to be too put together, but being from England it's in me naturally to want to dress up a little bit."
Although the 27-year-old has insisted that she would never soften her North East England accent, she accepts that she needs to alter some of her phrases so that she is understood in the US.
She added: "I kind of have to change the way I speak. I used to hear British people and think, 'Ugh, why are you saying 'take out the trash'? But I had this thing the other day because I'd said 'quarter past one' and they didn't get it.
"They don't say 'quarter past' or 'half past', they say '1.15'."