June 2012 was 14th hottest June of the 118 years on record in the “lower 48”, certainly warm but not record-setting at the monthly time scale.
The only state to set a monthly record was Colorado which did have its hottest June on record. Washington and Oregon were abnormally cool.
The widespread extraordinary record-breaking temperatures toward the end of the month, which produced an astonishing 170 all-time daily records (normally set in July or August), did not tip the monthly average into record territory. Nevertheless, 2012 remains on track to be the warmest calendar year on record in the contiguous US.