Google has enabled a couple new features for Google Calendar -- weather information and fun calendars.
Showing weather information is actually a pretty good idea. I am unable to get it working for my location right now, but you can try enabling it by following instructions found on the Google Calendar help page:
How to enable the Weather featureGoogle has created a "Google Doodle" calendar to demonstrate what can be done with "fun calendars" too. As they say, if you are "technically inclined" you can create your own iCal feeds that exhibit a similar behaviour.
To view weather forecasts in Google Calendar, simply follow these steps:
1. Click "Settings" at the top of any Google Calendar page.
2. Select the "General" tab if it isn't selected already.
3. In the "Location" section, enter your desired location information (e.g., “Los Altos, CA” or “94024”).
4. In the “Show weather based on my location” section, select either °F or °C.
5. Click "Save."