Weather Forecasting for Weather Derivatives



Notes to Tables and Figures

Table 1: We show each forecast’s root mean squared error, measured in degrees Fahrenheit.

Figure 1: Each panel displays a time-series plot of daily average temperature, 1996-2001.

Figure 2: Each panel displays a kernel density estimate of the unconditional distribution of daily average
temperature, 1960-2001. In each case, we employ the Epanechnikov kernel and select the bandwidth using
Silverman’s rule,
h=O.9σN~02.

Figure 3: Each panel displays the residuals from an unobserved-components model,
η =
Trendt + Sea9ona0t + ∑‰ P,Λ-,∙ + σεr 1996-2001.

Figure 4: Each panel displays a kernel density estimate of the distribution of the residuals from our daily
average temperature model,
Tt - Trendt - Seasonalt -       pi∙T,f.i∙. In each case, we employ the

Epanechnikov kernel and select the bandwidth using Silverman’s rule, h=O.9σN~02.

Figure 5: Each panel displays sample autocorrelations of the squared residuals from our daily average
temperature model,
,Tt - Tregdt - Setasothtelt - jɪ p,.7ζ,,.j2, together with Bartlett’s approximate ninety-
five percent confidence intervals under the null hypothesis of white noise.

Figure 6: Each panel displays a time series of estimated conditional standard deviations (σf) of daily
average temperature, where
ot = ɪ^i ^γc             + γs^sin^2π<7-∣∣θj + Ctejl1 + βo^1, 1996-2001.

Figure 7: Each panel displays the ratio of a forecast’s RMSPE to that of a persistence forecast, for 1-day-
ahead through 11-day-ahead horizons. The solid line refers to the EarthSat forecast, and the dashed line
refers to the autoregressive forecast. The forecast evaluation period is 10/11/99 - 10/22/01.

Figure 8: Each panel displays the ratio of a forecast’s RMSPE to that of a climatological forecast, for 1-
day-ahead through 11-day-ahead horizons. The solid line refers to the EarthSat forecast, and the dashed
line refers to the autoregressive forecast. The forecast evaluation period is 10/11/99 - 10/22/01.

Figure 9: Each row displays a histogram for z and correlograms for four powers of z, the probability
integral transform of cumulative November-March
HDDs, 1960-2000. Dashed lines indicate approximate
ninety-five percent confidence intervals in the
iid U(0,1) case of correct conditional calibration.



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