With his plan to sell 2,000 new yellow-taxi medallions still in doubt, Mayor Michael R. Bloomberg has proposed slashing money for libraries and after-school programs and increasing fees on school lunches and parking meters to compensate for more than $600 million in lost medallion revenue.

Mr. Bloomberg’s budget proposal does not reflect additional costs related to Hurricane Sandy, disaster relief or the storm’s effect on the local economy. Yet the storm will no doubt loom large when the mayor releases his budget plan in January or February for the 2014 fiscal year.

Instead, the new proposal — which, in an unusual move, was posted to the city’s Web site late Friday night but not announced until Sunday — represents a contingency plan to cope with a budget shortfall that must be addressed before the end of the fiscal year, on June 30.

“New York has fared better than other cities through fiscal uncertainty because of our responsible budgeting, and these measures will help to maintain critical services, including all hurricane relief, while keeping the city’s fiscal house in order,” said Lauren Passalacqua, a spokeswoman for Mr. Bloomberg.