About 1.25 million years ago, a spectacular volcanic eruption created the thirteen-mile-wide circular depression now known as the Valles Caldera. The preserve is known for its huge mountain meadows, abundant wildlife, and meandering streams. The area also preserves the homeland of ancestral native peoples and embraces a rich ranching history. Each season offers a different experience: lush springs, moderate summers, golden falls, and snowy winters. Average temperatures are 22°F (-6 C) in January and 60°F (16 C) in July. Temperature extremes range from a high of 84°F (29 C) in summer to -30°F (-34C) in winter. Precipitation is heavier during summer monsoon rains in July and August and winter snowstorms in December through March. Higher elevation lends to much cooler temperatures than nearby Albuquerque.