Be careful. The weeks around Presidents Day is always busy at Disneyland; schools in Seattle and Portland and Vancouver BC get a full week off then and families there either go skiing locally or head down to SoCal and Disneyland. The parks go extended hours that week, and then often extend closing day-of due to even bigger crowds than planned. If you avoid the Presidents Day holiday weekend by 6 days on either side of it, you should be fine.
I lived in New England for several years, so I know what winter is like there. If you luck out in February in SoCal you will have sunny skies and 72 degrees with chilly nights. If you get "bad weather" it will be 58 degrees and overcast with rain showers or drizzle, with chilly nights.
If it does get cloudy and wet, the locals will cower in their homes in absolute fear and won't go outside, while the freeways will be littered with car wrecks by people who don't know how to drive in light rainfall and haven't inflated and rotated their tires in years, if ever.
SoCal locals also don't have proper clothing for rain; the upper and middle classes trudge about absolutely miserably in soggy sweatshirts or jean jackets and canvas shoes, while the lower classes use cheap fleece blankets pulled over themselves thinking that's what will keep them warm and dry. It's pathetic to watch them in winter, as if they have no idea that the last 30 years of technological advances in water repellent outerwear existed.
A rainy day in February is a perfect time to enjoy Disneyland with light crowds and proper outerwear! Enjoy!
