Shout out to the team for making a snowfall background for the main screen. Small details like this make apps fun to use.
One question I have is, how do you know that snow is relevant? Is it based on time of the year? Will it ever go away? 
A lot of Canadians are headed to sunny destinations for the holidays. In this case, seeing snow in the app will be a bit odd. The app doesn’t pull snow based on current weather at user location, like the Weather app in iOS.
This is a great example of how both weather conditions and time of the day are used to create a background image:
You can probably get some weather API to change background image based on current conditions of wherever users happen to be: https://www.quora.com/How-do-you-change-the-background-images-depending-on-the-weather-condition-in-flutter-flow