There is a wide assortment of outdoor clocks available for you to select from, depending on your needs and interests. For instance, you may choose to have an outdoor clock that is a component of a complete meteorological station. While you won't be using the station to forecast any weather changes, these types of home weather stations to make great conversation pieces and also help to make young people in the family stay more aware of the natural world around them.
One more scaled down option is an outdoor clock that also features a temperature gage. This type of clock actually does come in handy if you have a pool in your yard. One option that is worth considering is a sundial. These are great conversation piece and make a great addition to your landscaping.
However; they do have the big drawback of not working well in overcast weather and not working at all at night. What most people seem to prefer in an outdoor clock is a clock with large visible arms, as they are easy to see from any distance.
Whatever type or style of outdoor clock that you choose, it is important that it be sealed well with sturdy rubber gaskets and even then you will want to hang it in a protected area. This is because, even though it is an 'outdoor'clock it will eventually be vulnerable to the elements if left directly exposed.