Arduino is a great way to do simple projects like this because it doesn’t require lots of messing with making PCBs and interfacing. Simple project can be done by attaching things directly and or by using protoboard. In this project Arduino reads temperature values from LM35DZ temperature sensor via analog input 0.
To display min and max temperature values there are a LCD attached in 4 bit mode. Of course it also shows current temperature. So it may be convenient to set it for some certain time to see what the temperature change was during 24 hr.