We are monitoring the uptime of this site through a service called MrAlert.com. Below are the statistics.

BlueHost offers an affordable hosting solution that does not sacrifice reliability or performance. Customers can rely on reliable uptime whenever hosting with BlueHost. In fact, their average uptime this year to date is 99.98%. This is better than many other shared hosting providers in the market. There were several months this year when BlueHost had an uptime of 100%.
All BlueHost customers receive a 99.9% uptime guarantee with their hosting plan. BlueHost has established a world-class infrastructure making it possible to guarantee such a high uptime percentage. Of course there is always the possibility that some factor beyond the control of the BlueHost Company will result in more downtime. Fortunately, this does not occur too often. Upgrades and maintenance downtime are acceptable and do not impact the uptime guarantee.
It is possible to receive a refund from BlueHost if a customer is not satisfied with their level of uptime. BlueHost offers several payment options upon signing up for services. There is no month to month option but rather prepayment choices of three, six, twelve and twenty-four months. Customers who make the decision to cancel their hosting plan after thirty days have passed, will receive a prorated refund based upon how many months of service are remaining. Many other hosting companies do not offer any amount of refund after thirty days.
When considering uptime, it is important to consider not only the uptime of the network but also that of the servers. BlueHost uses Linux based servers for their hosting products. Linux is often considered to be more stable and often able to offer a higher level of performance and uptime. Only the highest quality servers are found at BlueHost. Uptime is further enhanced due to server monitoring and other features of the excellent data center.
Server downtime can still occur even with all the precautions that are in place. Sometimes the server is overworked due to the number of people visiting websites on that server. Even with all the security measures in place there is also the possibility for breaches in security. On rare occasions a problem with the server itself arises. Most times BlueHost is still able to minimize server downtime with many problems being solved in less than fifteen minutes. In fact, BlueHost designs their own services and can pinpoint and repair most problems within minutes.
BlueHost offers a hosting solution at an unheard of low price within the industry. This hosting company has a remarkable uptime history that is a big attraction for hosting customers.
BlueHost Site Screenshot (http://www.bluehost.com)