In some places it is. Although where I live, there are usually several inches of snow on the ground by now, but it just rained today. So maybe TBT is basing it off of Canada.
Funny part is, each time when they change the background, I seem to enjoy it the first week as it feels fresh, but after like a month or two, the background gets old and tiring.
The part I didn't like about the background is now the time shift is set to one hour earlier. What I mean is that in 3:00 AM in your time, the sky changes from night to early night/late night (which happens at 5:00 AM in the spring/summer and 4:00 AM in the fall). This means the sun is fully up at 6:00 AM (in the TBT background). The sky changes at 4:00 PM again (when it does that at 5:00 PM in the fall and 6:00 PM in the summer), meaning we get the night sky again at 7:00 PM (which is at 9:00 PM in the summer or 8:00 PM in the fall).