Fig. 12 Surface air temperature anomalies over North America for DJF 1982-83 and DJF 1986-87. The observations are obtained from Schemm et al. (1992), and the simulation is the average of the 8 best AMIP simulations for the ENSO signal. Positive anomalies larger than 0.5°C are shaded darkly, and negative anomalies less than -0.5°C are shaded lightly. The contour interval is 1°C.