The euro was down against the dollar on Monday while the British pound rose sharply on the last day of the year.
The 13-nation currency bought US$1.4686 in afternoon European trading, down from US$1.4720 in late New York trading on Friday.
The British pound rose to US$2.0042, from US$1.9953, while the dollar slid to 111.63 Japanese yen from 112.47 yen.
Despite its slight rise on Monday, the dollar has suffered lately from worries over the health of the U.S. economy in the wake of the subprime lending crisis.
On Friday the Commerce Department reported that new home sales in November plunged to their lowest level in 12 years, tumbling 9 percent to a seasonally adjusted annual rate of 647,000.
News of opposition leader Benazir Bhutto's killing in Pakistan also appeared to contribute to currency markets' nervousness, amid persistent violence across the country that has badly damaged plans to restore democracy in the nuclear-armed U.S. ally.