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Observed 1915–1979 trends in June–August (green) and December–February (blue). (A) Tmax in regions of the Central Valley partitioned by CIF classes, relative to the trend in the reference class. Filled circles indicate that trend of d(t) is statistically significant at P < 0.01. The same analyses were conducted for Tmin (B), Tave (C), and DTR (D).
