The purpose of the Pacific Northwest Water Year 2024 Impacts Assessment is to connect the water year conditions to sector-specific impacts to inform planning, response actions, and technical and scientific information needs. Ultimately, the assessment can be used as a resource for future management of drought and other climate extremes. 

Quarterly Climate Impacts and Outlook for the Western Region for December 2024–February 2025. Dated March 2025.

Winter temperatures were above normal across the Southwest with California and Arizona both ranking as the fourth warmest on record. Temperatures were closer to normal in the Pacific Northwest and northern Rockies with some areas of below-normal temperatures in Montana. Winter precipitation was much below normal across the Southwest. Much of Oregon, eastern Washington, southern Idaho, and Montana saw above-normal winter precipitation.

Quarterly Climate Impacts and Outlook for the Western Region for September–November 2024. Dated December 2024.

Autumn temperatures were above normal across the West, and every state except for Oregon had a top ten warmest autumn since 1895. Northern California, southern Oregon, central Montana, and northeast New Mexico all saw areas of well-above-normal precipitation in autumn. Southeast California, southern Nevada, and western Arizona were exceptionally dry.