1978 Monthly Box Office
Data as of May 2, 2:03 PDT
| Month | Cumulative Gross | % of Year | Releases | Average | #1 Release | Gross | % of Total |
|---|---|---|---|---|---|---|---|
| December | $145,716,043 | 17.6% | 4 | $36,429,010 | Every Which Way But Loose | $85,196,485 | 58.5% |
| November | $30,471,420 | 3.7% | 1 | $30,471,420 | The Lord of the Rings | $30,471,420 | 100% |
| October | - | - | - | - | - | - | - |
| September | - | - | - | - | - | - | - |
| July | $197,262,064 | 23.9% | 2 | $98,631,032 | National Lampoon's Animal House | $119,814,585 | 60.7% |
| June | $264,774,810 | 32% | 4 | $66,193,702 | Grease | $159,978,870 | 60.4% |
| May | - | - | - | - | - | - | - |
| April | $22,832,504 | 2.8% | 2 | $11,416,252 | Close Encounters of the Third Kind | $19,932,006 | 87.3% |
| March | $17,223,384 | 2.1% | 2 | $8,611,692 | Close Encounters of the Third Kind | $11,002,219 | 63.9% |
| February | $22,714,487 | 2.7% | 2 | $11,357,243 | Close Encounters of the Third Kind | $18,219,181 | 80.2% |
| January | $125,418,301 | 15.2% | 3 | $41,806,100 | Saturday Night Fever | $75,978,327 | 60.6% |
