Knowing the current weather condition is nice. Instead of turning on the TV and turning to the weather channel why not spend a few weekends and build your very own DIY Weather Station Project. It is based on the PIC 18F452 microcontroller and has great documentation.

"Weather station with pressure reading, relative humidity, indoor & remote outdoor temperature display.Both Celsius or Fahrenheit & mbar/hPa or mm Hg supported. With calendar & clock. Easy 3-button user-menu. 42 hour-history display (curve). Auto-memory & display of all high and low-values. PIC 18F452 running at 4 MHz, power saving sleep mode. Sensors are only turned on when needed."