You might consider moving your site to a high-availabilty cloud solution/dedicated server with failovers if the uptime does not meet your expectations.
Btw:
you forgot to add the montly statistics ->
http://stats.pingdom.com/fe2zkikf7hb1/571483/2012/06
and this one ->
http://stats.pingdom.com/fe2zkikf7hb1/571483/2012/05
Also, reading up on how most hosting companies calculate uptime and what actually is defined as downtime might get you a better idea of what to do with the numbers you are pointing out here.