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Note: These data are available in spreadsheet format by clicking the ''Download Series History'' link on the previous page (with drop-down menu bar at top).
 View History:    Monthly     Annual   
U.S. API Gravity (Weighted Average) of Crude Oil Input to Refineries (Degrees)
Year Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
  1985 32.64 32.87 32.75 32.58 32.75 32.36 32.33 32.17 32.18 32.25 32.22 32.46
  1986 32.75 32.69 32.85 32.35 32.41 32.21 32.01 32.20 32.05 32.20 32.15 32.25
  1987 32.26 32.42 32.71 32.61 32.24 31.81 31.83 32.17 32.01 32.08 32.11 32.44
  1988 32.22 32.07 31.85 32.01 32.05 31.63 31.75 31.92 31.72 31.86 32.00 32.07
  1989 32.60 32.47 32.06 32.31 32.17 31.85 31.89 31.74 32.04 32.04 32.30 32.31
  1990 32.18 32.10 32.23 31.83 31.96 32.14 31.66 31.71 31.63 31.63 31.63 31.60
  1991 31.47 31.71 31.88 32.07 31.86 31.78 31.68 31.34 31.31 31.58 31.42 31.54
  1992 31.60 31.48 31.56 31.30 31.35 31.26 31.42 31.32 30.81 31.20 31.25 31.26
  1993 31.20 31.41 31.41 31.29 31.30 31.42 31.16 31.08 31.10 31.29 31.33 31.61
  1994 31.06 31.58 31.42 31.33 31.29 31.38 31.44 31.20 31.40 31.42 31.51 31.69
  1995 31.58 31.24 31.42 31.55 31.36 31.05 30.91 31.30 31.01 31.34 31.46 31.37
  1996 31.53 31.21 31.28 31.06 31.57 31.05 31.24 31.20 30.86 30.67 30.90 31.16
  1997 31.46 31.70 31.45 31.20 30.71 30.90 31.14 30.83 30.76 31.01 31.06 30.85
  1998 31.14 30.90 30.72 30.69 30.79 30.40 30.89 31.17 31.14 31.27 31.35 31.30
  1999 31.89 31.34 31.19 31.34 31.24 31.34 31.35 31.00 31.29 31.18 31.36 31.16
  2000 31.37 31.19 31.22 31.38 31.46 31.12 30.93 30.60 30.55 30.89 30.79 30.50
  2001 30.97 30.57 30.71 30.64 30.63 30.30 30.08 30.31 30.58 30.53 30.07 30.52
  2002 30.59 30.54 30.67 30.58 30.63 30.16 29.95 30.26 30.33 30.53 30.39 30.50
  2003 31.22 30.94 30.95 30.90 30.31 30.55 30.29 30.52 30.62 30.58 30.31 30.20
  2004 30.25 30.60 30.39 30.21 30.31 30.05 30.25 30.38 30.21 29.78 29.75 29.96
  2005 30.00 30.01 30.18 30.11 30.36 30.12 30.12 30.20 30.43 30.47 30.39 30.02
  2006 30.34 30.12 30.34 30.55 30.66 30.70 30.58 30.53 30.35 30.38 30.30 30.41
  2007 30.86 30.83 30.32 30.76 30.59 30.52 30.27 30.30 30.31 30.04 30.01 30.29
  2008 30.50 30.42 30.25 30.56

Updated on 6/26/2008
Source: U.S. Energy Information Administration
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