The Arduino platform lends itself nicely to data logging and working with a variety of sensors - and one example of this is by Willian Silver who shows how to measure temperature, humidity and dew point with an Arduino and LCD module. Furthermore the time and date is kept without using a RTC module, keeping the cost down (however it's recommended to use one for accuracy). The sensors used are easy to work with and once the system is completed it can also interface with WIllian's SCADA project mentioned that can be found in his code site.
To get started with your own temperature-measurement projects, consider using our TEMP: DS18B20-based temperature sensor module:
... or our HUMID: Humidity and Temperature sensor module based on the popular DHT22 sensor unit. Both modules are fully documented and easy to get started with. These are only two of over a dozen of our sensor and output modules.