In addition, the probability of a — 1.5 SD precipitation anomaly increases in spring (P < 0.001) and autumn (P = 0.01) in 2006 — 2080 relative to 1920 — 2005, with spring occurrence increasing
by ∼ 75 % and autumn occurrence increasing
by ∼ 44 % — which represents a
substantial and statistically significant increase in the risk of extremely
low - precipitation events at both
margins of California's wet season.