A mod to report what the current temp and humidity of your location -- both actual, and "ground level" (assume you are flying), as well as the biome type(s) of the biome you are in.
Said display may be limited to the F3 screen, without any loss of functionality.
Bonus points for determining what Reika's mods think is the temperature in addition to what vanilla/forge/biome wrappers say the temperature is.
Bonus points for being able to determine any changes to the default temp/humidity/biome type for the current biome (known examples: mystcraft ages with non-default weather -- being able to report both the original and the altered data is a minor plus).
NB: This should not be considered an "urgent request for someone to please do this". Rather, *PLEASE, someone, I need this for help on balancing COG for 1.7.10.
EDIT: Alternatively, a mod that just dumps a static list of all biomes, and their base/default temps/humidity/biome types after all biomes have been defined/registered with forge, at start-up. (Similar to the list-of-mods dumper program).