You need temperature. You need a real time clock. You don't want two modules. You want the MOD-1001.
It's got everything for making great clocks, a fantastic RTC from ST and a snappy temperature sensor from TI.
Now with replaceable battery (not that you should ever need to!)
|Description||RTC and Temp Sensor Module|
|Hackability||100% (full datasheet, schematics, source code provided; see the rtc_temp_sensor_module demo project in the latest PicPack library)|
|Temperature sensor||TI TMP75 or TI TMP275|
|Real Time Clock||ST M41T81S|
|Datasheet||MOD-1001 datasheet for v5|