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Understanding Yavapai County's Climate: Patterns, Precipitation, and Growing Seasons

Yavapai County's climate is characterized by bimodal precipitation patterns, significant temperature fluctuations, and variability due to elevation differences. The region experiences highly variable summer precipitation, occasional droughts, and a monsoon season that is most reliable in the southeastern part of the state. Freeze probabilities vary by location, influencing the average growing seasons, which are 140 days in Prescott and 194 days in Cottonwood. Understanding the impacts of El Niño and La Niña events on winter precipitation is crucial for agricultural planning and resource management.

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Understanding Yavapai County's Climate: Patterns, Precipitation, and Growing Seasons

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  1. Yavapai County Climate Jeff Schalau Agent, Agriculture & Natural Resources University of Arizona Cooperative Extension Yavapai County

  2. Arizona’s Climate • Bimodal Precipitation Pattern • Wide Diurnal Temperature Fluctuations • Elevation Differences Cause Variability • Highly Variable Summer Precipitation • Periodic Drought • Monsoon Most Dependable in Southeastern Portion of the State

  3. Freeze Probabilities - Prescott Spring Freeze Probabilities (32.5 degrees F) Fall Freeze Probabilities (32.5 degrees F) Average Growing Season = 140 days

  4. Freeze Probabilities - Cottonwood Spring Freeze Probabilities (32.5 degrees F) Fall Freeze Probabilities (32.5 degrees F) Average Growing Season = 194 days

  5. El Nino and La Nina • Related to temperature and current in the equatorial Pacific Ocean • El Nino increases the probability of winter precipitation • La Nina almost always forecasts low winter precipitation

  6. Arizona’s Paleoclimate • Data gathered from tree ring and pack rat midden studies

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