The citation databases Scopus and Web of Science contain different metrics on a journals basis as well as on an author basis.
The Scopus Database offers access to more than 1.8 billion cited references dated from the current year back until 1970.
Video: How to view Metrics for a Journal Title
The CiteScore of a scientific journal reflects the yearly average number of citations to recent articles published in that journal. It is based on the citations recorded in the Scopus database.
Video: How to view CiteScore metrics
SCImago Journal Rank (SJR)
SCImago Journal Rank measures weighted citations received by the serial. Citation weighting depends on subject field and prestige (SJR) of the citing serial.
Source Normalized Impact per Paper (SNIP)
Source Normalized Impact per Paper measures actual citations received relative to citations expected for the serial’s subject field.
This data can either be retrieved from the Scopus Database or from the Website of Scimago Lab. For tracing a longer period of the certain metrics, the website of Scimago Lab is recommended.