Cache is on the coordinates. You must meet certain requirements in order to log in the find in this cache.
To complete this challenge, you must have found a cache hidden/placed on each date in December. Those finds don’t have to be on the same year, previous finds do count.
Before logging cache as "Found" on the internet, of course you have to visit the cache and sign the logbook.
But you can not log the find until you meet the requirements (in this way you don't have to return to sign a logbook after meeting the requirements!)
To prove you have fulfilled the requirement, paste your result from the checker.