DONT!!! I REPEAT...do not even consider storing coffee in a fridge.
i have a perculator in my office and we go through alot of coffee (230g packet lasts just over 2days).
i dont know how long it takes you guys from the day you open the packet till you use the last bit, but get a airtight container and store in a cupbourd. try not to expose it to heat as it will also affect the life of your ground coffee.
best advice i can give you, is buy the smallest packets of ground coffee if you are scared of wasting or letting it lose its taste (bigger isnt always better)