Welcome to December at the office. Here are some of the things you can look forward to during this festive month:

Now that your department's budget for 1985 has theoretically been approved, the first or even second request to cut it will appear from on high.

A key person in your office will announce that he or she is departing about the end of the year for an enviable new job.

A virus is bound to strike many of your coworkers . . . and may strike several others as a good excuse for absence.

A renowned business pundit will proclaim in pundit-ese that the 1985 economy is going to be the pits. An equally credible expert will promise a rosy 1985. You, too, will be expected to have a firm opinion on the subject.

A mysterious, enticing stranger will approach you at a Christmas party -- and embrace the person behind you.

If you're a college graduate, you will be dunned by mail -- and by a phone call from a classmate as well -- to contribute to the alumni fund while you can still chalk it up as a 1984 deduction.

If you're a manager, you will only manage to take one long lunch hour for shopping. If you're a manager and the accounting department resists accruals, you'll have trouble getting some of your suppliers to submit bills by the end of the year.

A major customer will offer season's greetings and then announce a reduction of expenditures with you in 1985 -- in practically the same breath.

Everyone in your department will want to take Monday the 24th off. Most also will want vacation time on the 31st. And several will be unhappy at the outcome.

About Friday the 21st, a few days after you have finally dispatched Christmas cards to a logical selection of folks at the office, you will receive two cards from fellow employes who were not on your list.

Despite all this, you will get caught up in the warm, well-wishing spirit of the season -- just in the St. Nick of time.