With a population of around 11,900, Nacozari Viejo sits in Sonora, Mexico. The city operates in the America/Hermosillo time zone.
In 2025, Nacozari Viejo recorded an average annual temperature of 66°F. The hottest temperatures reached 102°F in August; the coolest were 19°F in January. Total precipitation for the year was 19 inches, with the wettest month being September. Snowfall for the year totaled approximately 1 inches.
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