Doors getting stuck and hard to open

[Rachid B.]

Hi everyone, I am hoping someone out there has seen this and can shed some light.

I moved in to house last summer, every single door was shutting and opening with no issues at all. This past month, I noticed about 4 room doors, a closet door as well as storm door in the backyard started to get very hard to close. Is that something related to humidity, land shifting or something else?
Thank you in advance,

[Nathan Gesner]

Most likely due to swelling from temperature/humidity shifts. Sand or plane the areas that are sticking and it should be fine, at least for a while.