Oil Prices in December 2005: WTI & Brent Daily Prices and Monthly Average
WTI average
$59.41
EIA monthly average
vs November 2005
+1.9%
$58.32
vs December 2004
+37.7%
$43.15
Brent average
$56.86
avg daily Brent − WTI −$2.60
WTI averaged $59.41 per barrel in December 2005, up $1.09 (1.9%) from November 2005. The average was 38% above the $43.15 of December 2004.
Daily spot prices, December 2005
Chart data table (22 rows)
| Period | WTI | Brent |
|---|---|---|
| Dec 30, 2005 | $61.06 | $58.34 |
| Dec 29, 2005 | $60.26 | $57.72 |
| Dec 28, 2005 | $59.81 | $56.91 |
| Dec 27, 2005 | $58.16 | — |
| Dec 26, 2005 | — | $56.54 |
| Dec 23, 2005 | $58.08 | $56.28 |
| Dec 22, 2005 | $58.08 | $57.30 |
| Dec 21, 2005 | $58.56 | $56.05 |
| Dec 20, 2005 | $57.81 | $56.08 |
| Dec 19, 2005 | $57.31 | $56.09 |
| Dec 16, 2005 | $58.01 | $58.11 |
| Dec 15, 2005 | $60.01 | $59.67 |
| Dec 14, 2005 | $60.86 | $59.59 |
| Dec 13, 2005 | $61.36 | $59.16 |
| Dec 12, 2005 | $61.36 | $57.23 |
| Dec 9, 2005 | $59.41 | $57.18 |
| Dec 8, 2005 | $60.66 | $56.26 |
| Dec 7, 2005 | $59.21 | $55.17 |
| Dec 6, 2005 | $59.96 | $55.68 |
| Dec 5, 2005 | $59.91 | $56.05 |
| Dec 2, 2005 | $59.31 | $54.91 |
| Dec 1, 2005 | $58.46 | $53.65 |
Prices peaked at $61.36 on Dec 12, 2005, then fell to $57.31 on Dec 19, 2005 and ended at $61.06.
Brent traded below WTI on average this month: $56.86 for the month, $2.60 under WTI across 20 matched dates.
Adjusted with CPI-U, the December 2005 average equals $101.72 in September 2026 dollars.
December 2005 summary
| Measure | WTI | Brent |
|---|---|---|
| Monthly average | $59.41 | $56.86 |
| Change vs November 2005 | +$1.09 | +$1.62 |
| Change vs December 2004 | +$16.26 | +$17.26 |
| Highest daily price | $61.36 Dec 12, 2005 | $59.67 Dec 15, 2005 |
| Lowest daily price | $57.31 Dec 19, 2005 | $53.65 Dec 1, 2005 |
| Published daily observations | 21 | 21 |
| Average in September 2026 dollars (CPI-U) | $101.72 | $97.35 |
Monthly averages are EIA's published figures. Real figures use CPI-U for December 2005.
Source and methodology
| Provider | Series | Units | Coverage | Latest observation |
|---|---|---|---|---|
| U.S. Energy Information Administration | RWTC — WTI spot price FOB (daily, monthly) | $/bbl | Dec 1, 2005 – Dec 30, 2005 | Dec 30, 2005 |
| U.S. Energy Information Administration | RBRTE — Brent spot price FOB (daily, monthly) | $/bbl | Dec 1, 2005 – Dec 30, 2005 | Dec 30, 2005 |
| U.S. Bureau of Labor Statistics | CUUR0000SA0 — CPI-U, all items, NSA | index, 1982–84=100 | monthly | September 2026 |
Last updated: Oct 21, 2026, 5:27 PM CDT. Raw values are shown in source units; any conversion is labeled. See methodology and data sources.
Download:2005 daily prices (CSV)