Just plug this into your computers USB port, pick your desired recording intervals and start time/date.   Then unplug it and place it in areas you want to monitor temperatures. When you are doe, plug it back in and see all the readings!
 
The USB Temperature Data Logger records and stores 16,000 temperature readings. The temp logger features protection against water and dust to IP67 standards when the cap is fitted, user selectable sampling rate and start time and direct usb connection to PC for downloading of data. The logger software allows for data to be graphed, printed and exported. Correct functioning of the unit is indicated by flashing red and green LED.

USB Temperature Logger Includes:
Windows PC Software on CD
1/2 AA 3.6V Lithium Battery
    USB Interface for Set-up and Data Download
    2 User-Programmable Alarm Thresholds
    Red and Green LED Alarm Status Indicator
    Yellow LED Troubleshooting Indicator
    Replaceable Internal Lithium Battery
    Programmable Start Date and Time