Cooler-than-average regions included New Zealand, Canada, and parts of western and central Asia and Australia. Large portions of Canada were 2-5°C (4-9°F) below average.
Sea surface temperatures were above average over most of the oceans; the notable exceptions were parts of the northeastern Pacific and central Atlantic.
Precipitation patterns during May were generally mixed, according to NCDC:
During May 2009, above-average precipitation fell over areas that included southeastern Asia, the southeastern contiguous U.S., northeastern Brazil, east central Australia, and parts of Russia, northern Europe, and northern India. Drier-than-average conditions were present across the Hawaiian Islands, Alaska's panhandle, the central U.S., northeastern South America, southern Europe, eastern Asia, and most of Australia.Images (click to enlarge): May global temperature departures from average since 1880, May 2009 land and sea surface temperature departures, May 2009 precipitation departures, all from NOAA/NCDC