The station signed on as W42AU in 1988 airing a low-powered analog signal, on UHF channel 42, from a transmitter on Mount Tom in Holyoke. The station served as the Pioneer Valley's over-the-air repeater of the Trinity Broadcasting Network without any local deviation outside of station identification.
In 1994, it moved to UHF channel 67 and became W67DF.
In 2003, the Meredith Corporation (having acquired WFSB; the former de facto CBS affiliate for the Pioneer Valley for 37 years; purchased in June 1997) purchased W67DF in order to set up a separate operation in the Pioneer Valley. Reasons for such a launch ranged from local advertising opportunities, along with being able to assert the Pioneer Valley as a secondary New England Patriots market, hoping to avoid preempting Patriots games in Hartford–New Haven.
The logo style is similar of that to now-sister station KPHO-TV in Phoenix.
In 2006, WSHM switched to this logo based off that of KYW-TV in Philadelphia.
The "Springfield" below the logo was removed in 2015.