Climate anxiety may be just the beginning of a broader mental health crisis as temperatures rise across America. This comprehensive modeling study reveals that even modest warming could trigger millions of additional days of anxiety and depression symptoms nationwide, with disproportionate impacts on vulnerable populations. The research represents the first attempt to quantify climate-driven mental health burdens at a population scale using rigorous epidemiological methods rather than self-reported climate exposure data. By linking CDC behavioral surveillance data with climate projections from five major models, investigators constructed damage functions showing how temperature and precipitation changes translate into measurable increases in poor mental health days among American adults. The analysis incorporated both acute responses to extreme weather events and chronic adaptation stress from persistent climate shifts. Results indicate that each degree of warming could generate substantial increases in symptom-days for anxiety and depression, with effects varying by region, age, and gender. Southern and southwestern states showed the highest vulnerability, while older adults and women demonstrated greater sensitivity to temperature-related mental health impacts. This quantitative framework fills a critical gap in climate health research, moving beyond anecdotal reports to provide policymakers with concrete projections of mental health costs. The findings suggest that climate adaptation strategies must include robust mental health infrastructure investments, particularly in already vulnerable communities. While the study advances our understanding of climate-mental health linkages, limitations include reliance on symptom-days rather than clinical diagnoses and uncertainty about future adaptation capabilities that could modify these projections.