WeatherMan is a utility that gives you access to the latest weather reports for the areas of your interest. This program is very simple to handle, provides you with comprehensive reports, and uses minimum CPU resources while running in your Menu Bar.
You have access to various weather information, such as temperature, humidity level, wind speed, visibility, etc. The application also provides you with the forecast for the next couple of days and allows you to update the offered info at any interval of time you like.
There's also an option to convert UTC time to your local time. This feature comes in handy if you want to check weather reports for a city in a different timezone that you're planning to visit soon.
Unfortunately, there seems to be a big problem with reporting weather info for international cities (also, one user posted this issue on the download page of the app). Every time I try to add a city outside US into the City Manager window, the app fails to fetch weather reports and crashes. So, you can check weather reports only for US cities.
In conclusion, it's worth buying this tool only if you want to read weather information for US cities. Otherwise, I'd suggest you to try a different weather app or use your default Web browser to find the information you need.