Table 2. Change in average climate variables between 1980-1999 and 2080-2099 from GCM and RCM output.

Region	Model	Mean temperature of the coldest month, °C	Mean temperature of the warmest month, °C	Annual precipitation, mm	April–August precipitation, mm
California	GCM	2.53	2.52	–12.49	–5.27
	RCM	2.45	2.82	–5.18	–19.87
Northwest California	GCM	2.16	2.16	–30.69	–11.81
	RCM	2.27	2.98	31.11	–16.03
Cascade Ranges	GCM	2.51	2.49	–6.95	–2.03
	RCM	2.60	3.33	39.15	–20.45
Modoc Plateau	GCM	2.54	2.52	–3.65	–0.44
	RCM	2.64	3.65	39.81	4.26
Sierra Nevada	GCM	2.57	2.55	–2.12	–0.65
	RCM	2.66	2.90	–17.20	–46.43
Great Central Valley	GCM	2.45	2.43	–6.28	–2.36
	RCM	2.37	2.41	–3.63	–24.56
East of Sierra Nevada	GCM	2.71	2.71	–0.85	–0.58
	RCM	2.86	3.53	–18.16	–25.39
Central west California	GCM	2.25	2.23	–18.08	–7.44
	RCM	2.21	2.15	–20.35	–18.78
Mojave Desert	GCM	2.83	2.84	–14.07	–6.81
	RCM	2.68	3.07	–13.77	–10.82
Southwest California	GCM	2.58	2.58	–15.26	–7.41
	RCM	2.28	2.41	–31.38	–16.12
Sonoran Desert	GCM	2.80	2.79	–14.37	–7.31
	RCM	2.04	2.53	–38.06	–5.79
Blue oak	GCM	2.38	2.37	–12.65	–4.94
	RCM	2.37	2.56	2.71	–24.45
Valley oak	GCM	2.32	2.34	–13.27	–5.26
	RCM	2.32	2.49	0.04	–23.26

The first two rows reflect mean changes for all of California; subsequent rows reflect changes within the ecoregions identified in Fig. 1B. Blue oak and valley oak rows reflect changes within the modern potential habitat for those species, as determined by the discriminant model described in the text.