Some resources that might be useful for making a  winter-themed visual novel.

• Snowfall GUI - Ren'Py script for creating animated snow.
• Pexels dot com: Snow videos - Stock videos of snowflakes falling. Can be useful if you're looking for video files to play as a CG or background.
• Katy133 VN Asset Pack - CG art pack that includes snow falling.
• 100 Winter Things - Asset pack of pixel art sprites.

Feel free to reply with other wintry recommendations.

I just added a watercolor styled winter park background pack! 

Winter Park BG Pack

This video is also useful for those who want to include voice acting in your project.

6:14 into the video's timeline, there is an example of a voice acting spreadsheet you can recreate in Google Spreadsheets for your voice actors.

Thanks! These will come in handy! :D

Music: http://www.presence-of-music.com/download.html

Winter GUI Kit: https://novelkit.itch.io/winter-renpy-gui-kit