Checkout this NASA video on You tube about how you can see Mercuryonce the sky clears after winter blizzard Nimo.
http://m.youtube.com/#/watch?v=117lEleTeiY&feature=em-uploademail&desktop_uri=%2Fwatch%3Fv%3D117lEleTeiY%26feature%3Dem-uploademail
http://m.youtube.com/#/watch?v=117lEleTeiY&feature=em-uploademail&desktop_uri=%2Fwatch%3Fv%3D117lEleTeiY%26feature%3Dem-uploademail