I spent most of my child and teen years in Stockton, which has generally higher crime than Sacramento, per capita. I haven’t lived there in about 15 years, so a lot of day-to-day stuff has changed. See comments above for useful info. I’ve only been there for short visits since moving.
But apparently, crime stats haven’t gotten much better over the years. If you’re used to urban NYC, or parts of Jersey, you probably won’t think it’s that bad. If you’re from upstate NY, you’re in for an interesting experience, particularly in certain parts of town.
Public transport is crappy compared to NYC. You’ve got busses…and busses. And the people who ride busses tend to be from lower income neighborhoods. See crime stats above to determine whether you’re going to be comfortable commuting on busses. There’s virtually no rail intra-city.
You’re probably going to be driving. A lot. Study a map. Business 80 is different from HWY 80, and you will get lost if you don’t pay attention. I had a driving job in Sac., learned most of the roads and tangled highways, and I still got lost every once in a while. I found Los Angeles to be less confusing to navigate.
Oh, and lock your damn car, even if you’re going to be gone for “just a minute.” Sacramento is usually one of the top five cities nationally for car theft, and the surrounding areas in the central valley usually populate about 3–5 spots out of the top ten per capita. Don’t leave anything in your car if it is even slightly valuable; even in a parking lot during the day you can come back to a broken window and missing stuff.
Weather during the summers usually sucks. It’s cooler than Arizona, but that’s not saying much. Some major roads and even highways flood occasionally during the winter when they get sporadically torrential rains. Doesn’t happen every year, but it does happen.
On the plus side, you are close to both the Bay Area and mountains. Access to northern California where there’s sparse population and really beautiful country, Sierra Nevada mountains are great for hiking as well as skiing. Decent nightlife and cultural attractions. Two major colleges, several minor. A couple of gignormous malls if you like shopping.