US Treasury rates, December 2008

Zero rates at all 10 fitted maturities on each of 22 trading days this month. Zero rates, not par yields: these discount a single cashflow, and the par yield for the same day is on that day's own page.

0.00%0.50%1.00%1.50%2.00%2.50%3.00%3.50%Dec 1, 2008Dec 31, 2008Dec 1, 20082Y zero rate0.688%10Y zero rate3.350%30Y zero rate2.898%Dec 2, 20082Y zero rate0.682%10Y zero rate3.310%30Y zero rate2.850%Dec 3, 20082Y zero rate0.632%10Y zero rate3.288%30Y zero rate2.831%Dec 4, 20082Y zero rate0.585%10Y zero rate3.160%30Y zero rate2.759%Dec 5, 20082Y zero rate0.748%10Y zero rate3.298%30Y zero rate2.561%Dec 8, 20082Y zero rate0.789%10Y zero rate3.363%30Y zero rate2.613%Dec 9, 20082Y zero rate0.654%10Y zero rate3.251%30Y zero rate2.509%Dec 10, 20082Y zero rate0.666%10Y zero rate3.285%30Y zero rate2.524%Dec 11, 20082Y zero rate0.597%10Y zero rate3.222%30Y zero rate2.520%Dec 12, 20082Y zero rate0.585%10Y zero rate3.212%30Y zero rate2.533%Dec 15, 20082Y zero rate0.507%10Y zero rate3.159%30Y zero rate2.648%Dec 16, 20082Y zero rate0.402%10Y zero rate2.986%30Y zero rate2.538%Dec 17, 20082Y zero rate0.512%10Y zero rate2.781%30Y zero rate2.343%Dec 18, 20082Y zero rate0.483%10Y zero rate2.621%30Y zero rate2.226%Dec 19, 20082Y zero rate0.556%10Y zero rate2.666%30Y zero rate2.238%Dec 22, 20082Y zero rate0.637%10Y zero rate2.675%30Y zero rate2.306%Dec 23, 20082Y zero rate0.661%10Y zero rate2.689%30Y zero rate2.344%Dec 24, 20082Y zero rate0.677%10Y zero rate2.716%30Y zero rate2.343%Dec 26, 20082Y zero rate0.651%10Y zero rate2.670%30Y zero rate2.321%Dec 29, 20082Y zero rate0.556%10Y zero rate2.674%30Y zero rate2.357%Dec 30, 20082Y zero rate0.540%10Y zero rate2.660%30Y zero rate2.320%Dec 31, 20082Y zero rate0.593%10Y zero rate2.835%30Y zero rate2.377%
2Y zero rate10Y zero rate30Y zero rate
Zero rate first, last, low and high for each charted tenor across December 2008.
TenorFirstLastChangeLowHigh
2Y0.688%0.593%-9.5 bp0.402%Dec 16, 20080.789%Dec 8, 2008
10Y3.350%2.835%-51.5 bp2.621%Dec 18, 20083.363%Dec 8, 2008
30Y2.898%2.377%-52.2 bp2.226%Dec 18, 20082.898%Dec 1, 2008

Rates are percent; the change column is basis points. A rise in yield is a fall in price, so the colours here describe the rate rather than a bondholder's return.

Every trading day

Zero rate at each of the 10 fitted maturities, for every fitted trading day in December 2008.
Date1Y2Y3Y5Y7Y10Y15Y20Y25Y30Y
Dec 1, 20080.608%0.688%0.956%1.725%2.498%3.350%3.881%3.732%3.333%2.898%
Dec 2, 20080.611%0.682%0.940%1.692%2.458%3.310%3.848%3.701%3.296%2.850%
Dec 3, 20080.551%0.632%0.898%1.662%2.433%3.288%3.826%3.678%3.274%2.831%
Dec 4, 20080.480%0.585%0.854%1.594%2.335%3.160%3.694%3.568%3.186%2.759%
Dec 5, 20080.576%0.748%1.006%1.745%2.488%3.298%3.821%3.669%3.182%2.561%
Dec 8, 20080.572%0.789%1.078%1.837%2.574%3.363%3.860%3.700%3.219%2.613%
Dec 9, 20080.453%0.654%0.938%1.703%2.449%3.251%3.762%3.605%3.121%2.509%
Dec 10, 20080.463%0.666%0.946%1.710%2.466%3.285%3.811%3.652%3.155%2.524%
Dec 11, 20080.417%0.597%0.871%1.635%2.394%3.222%3.765%3.623%3.140%2.520%
Dec 12, 20080.408%0.585%0.855%1.616%2.377%3.212%3.767%3.633%3.154%2.533%
Dec 15, 20080.359%0.507%0.809%1.591%2.345%3.159%3.650%3.486%3.084%2.648%
Dec 16, 20080.283%0.402%0.679%1.425%2.166%2.986%3.511%3.372%2.978%2.538%
Dec 17, 20080.363%0.512%0.767%1.412%2.050%2.781%3.294%3.192%2.807%2.343%
Dec 18, 20080.338%0.483%0.724%1.327%1.926%2.621%3.124%3.041%2.677%2.226%
Dec 19, 20080.360%0.556%0.821%1.426%2.004%2.666%3.147%3.064%2.698%2.238%
Dec 22, 20080.422%0.637%0.904%1.491%2.042%2.675%3.149%3.088%2.749%2.306%
Dec 23, 20080.430%0.661%0.937%1.526%2.070%2.689%3.150%3.093%2.768%2.344%
Dec 24, 20080.444%0.677%0.955%1.551%2.098%2.716%3.166%3.098%2.767%2.343%
Dec 26, 20080.425%0.651%0.923%1.509%2.052%2.670%3.132%3.073%2.747%2.321%
Dec 29, 20080.337%0.556%0.832%1.443%2.016%2.674%3.167%3.115%2.786%2.357%
Dec 30, 20080.310%0.540%0.827%1.449%2.022%2.660%3.113%3.040%2.719%2.320%
Dec 31, 20080.365%0.593%0.889%1.546%2.156%2.835%3.304%3.201%2.829%2.377%

Index levels before September 30, 2026 are back-tested. They were computed after the fact by applying the rules to historical data, which benefits from hindsight in the choice of rules, and an index cannot be invested in directly. Methodology v1.0 takes effect at that rebalance, when levels begin to be struck on the day; the rulebook is identical either way, and the version is published on every row.

A fitted curve is a fit, not a quote. Daily error averages 3.8 basis points across the history and reaches about 20 on the worst days, in December 2008, when the market was genuinely hard to fit one smooth curve to. Every curve page publishes its own fit error rather than burying it.

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Curves are fitted from public Treasury data and carry fit error; figures are not a record of trading, and an index cannot be invested in directly. No claim of compliance with the IOSCO Principles for Financial Benchmarks is made or implied. Not investment advice, not an offer, and not a recommendation to buy or sell any security.