Were they on or off?
I was friends with a family that kept their Christmas tree up year round and covered in a corner of their house to make it easier to set up. There are also people who keep a tree up year round with decorations for other holidays in the year, like Valentine's Day, Easter, July 4th, etc.
I hope this is still on topic. First, many people who observe the Christian feast day of Epiphany on Jan 6, when Jesus was baptized and the 3 kings came to visit, will keep their decorations up until that time.
But traditionally in California, radio stations will stop playing Christmas music at 12:01 a.m. on Dec. 26, when they return to regular programing. That includes songs that reference winter only, such as Frosty the Snowman, Winter Wonderland, etc.
For Christmas decorations: Some homeowners' associations require that decorations be taken down by January 2. But they also have to make exceptions for unusually cold or icy weather. I cannot imagine trying to walk around on an icy or wet roof in freezing temps to get decorations down.
What I did with the Christmas lights: I took down the multi-colored outdoor strings of lights by Jan. 2. But I kept up the clear white mini-lights I had on the outdoor shrubs, which were along a portion of our street which is really dark. It gets dark so early in the evening and gets light so late in the morning, that people who have to walk their dogs on that street have a hard time seeing the sidewalk. There are also nocturnal creatures like coyotes and raccoons, which can be aggressive and are better off avoided.
So I turn those clear lights on each day at early dusk and keep them on all night. The neighbors have told me how nice and cheerful they look in the drizzle and fog. ( We get Tule ground fog from the San Joaquin Valley and Sacramento Valley). Then 3 of our other neighbors put up clear mini-lights of their own. So far, the HOA has not said anything about it.
( I'm sorry if this is off-topic, but at least it is about events in January - Daryl)