We all know about worshipping Shiva in the month of *Shravana* (श्रावण), especially on every Monday of that month i.e *Shravana Somavara*.  

What's the significance of worshipping Shiva in *Shravana*? In other words, How is the *Shravana* month significant or special for Shiva?  

Is it described or mentioned in any scripture like Purana?