month	temp	bill
Apr-91	51	41.69
May-91	61	42.64
Jun-91	74	36.62
Jul-91	77	40.7
Aug-91	78	38.49
Sep-91	74	37.88
Oct-91	59	35.94
Nov-91	48	39.34
Dec-91	44	49.66
Jan-92	34	55.49
Feb-92	32	47.81
Mar-92	41	44.43
Apr-92	43	48.87
May-92	57	39.48
Jun-92	66	40.89
Jul-92	72	40.89
Aug-92	72	41.39
Sep-92	70	38.31
Oct-92	*	*
Nov-92	45	43.82
Dec-92	39	44.41
Jan-93	35	46.24
Feb-93	*	*
Mar-93	30	50.8
Apr-93	49	47.64
May-93	*	*
Jun-93	68	38.7
Jul-93	78	47.47