This Przelotne opady icon is made in Material Design style developed by Google. This style is based on extremely simplified shapes, thin two-pixel lines, and is optimized for 24x24 px. Unlike other vector icon packs that have merely hundreds of icons, this icon pack contains 4,300 icons, all in the same style and quality.
This icon is showing weather that is moderate rain. It has a picture of a cloud with three humps, and then under the cloud it shows three dashed lines falling from the cloud denoting a good amount of rain.