The synoptic situation, formation and disappearance causes, and correlation between visibility and meteorological elements are analyzed in detail for a drizzlelike fog occurred in Tai’an in the summer of 2011, by using the data collected by traffic meteorological observation stations, the surface meteorological observation stations, and GFS from 2011 to 2014. As a result, the following conclusions are reported: (1) In Tai’an, drizzlelike fogs mostly occur at night and early morning in summer and autumn during 2011-2014. All drizzlelike fogs had a duration of less than 3 hours, and the lowest visibility is generally above 500 m. (2) As for the drizzlelike fog on 22 June 2011, the convergence and lifting of the southerly airstream on the south side of Taishan Mountain are important contributors of the drizzlelike fog, and the evaporation is the primary cause of the drizzlelike fog. The weaker precipitation supported its maintaining. (3) The inverse correlation of humidity and visibility is stronger, but the humidity did not fluctuate with visibility. The very low wind speed, less than 2 m/s, the lower inversion layer, weaker temperature inversion, and the radiation cooling effect were found during the event.