From NOAA’s State of the Climate (as reported by Grist) October 2012:

The average temperature across land and ocean surfaces during October was 14.63�C (58.23�F). This is 0.63�C (1.13�F) above the 20th century average and ties with 2008 as the fifth warmest October on record. The record warmest October occurred in 2003 and the record coldest October occurred in 1912. This is the 332nd consecutive month with an above-average temperature. The last below-average month was February 1985. The last October with a below-average temperature was 1976. The Northern Hemisphere ranked as the seventh warmest October on record, while the Southern Hemisphere ranked as second warmest, behind 1997.
Read more at NOAA.