Caulking keeps dirt, air, water, and bugs out!
Caulk
Caulking is something that should also be done once a year. You should caulk around the exterior joints and around the windows.
Just because its warm out doesn't mean you wont need to do this. In the summer you are trying to keep the warm air out and this is a vital place that air seeps in from. Don't forget to caulk around the doors also.
This seems to be a place people forget and its one of the most important spots. Caulking around these will also help keep all the summer insects out of your home. This can be a huge issue if a ton of bee's figure out how to get in your home.
To keep the hot summer air out of your house and the cool air in - thus saving money on air conditioning - be sure your windows are sealed properly. Caulking keeps dirt, air and water out, You want to check your seals, and if they are dry, cracked, or dirty, it's time to re-caulk.