Artyom Ilyin

Simple easy-to-use and easy-to-set-up lightweight plugin for snowfall effect on your site. If you have any questions or inqueries, please feel free to get in touch via email kupnoh25@gmail.com.
Snowfall plugin uses snowfall library to set up snow effect. For more info about the library go to https://github.com/KupnoH/snowfall. 
Plugin is very easy to install and use. 
Though some coding needed to set this plugin up it’s very easy and Installation section explains it in details. 
You can find this plugin on github <a href="https://github.com/KupnoH/snowfall-wp" rel="nofollow ugc">here</a>

Snowfall

Simple easy-to-use and easy-to-set-up lightweight plugin for snowfall effect on your site.

WinkingFrog

This is a straight forward Plugin that does not require the use of any shortcodes or widgets. Simply head for Settings > WFS Let It Snow and configure your snow flurry! This plugin makes use of Jason Brown’s brilliant jQuery plugin <a href="http://loktar00.github.io/JQuery-Snowfall/" rel="nofollow ugc">Snowfall</a>, all credit for the snow effect must go to Jason! This is being distributed as a FREE plugin from Winking Frog Studios, we hope you all have a wonderful festive season!
There is a really good chance this plugin will work with earlier versions of WordPress, but the chances are an active site will be at WordPress 4.0 or higher anyway.
<h3>Plugin Usage & Shortcodes</h3>
Once installed and activated you will find a ‘Let It Snow’ menu item in your Settings. The settings for the plugin are all very straight forward, just play around with them until you get the desired effect.
Developed by <a href="http://winkingfrog.com" rel="nofollow ugc">Winking Frog Studios</a>

WFS Let It Snow

A super simple plugin that adds some seasonal snowfall to your website.

Snowfall vs WFS Let It Snow