Play with arduino and different modules.
DHT11_Ethernet Temperature and Humidity monitoring base with Ethernet interface
DS18B20_LCD termometer with LCD screen
DS18B20_SegmentLED termometer with segment led screen
https://github.com/jcw/ethercard/
https://github.com/adafruit/DHT-sensor-library
http://www.pjrc.com/teensy/td_libs_OneWire.html