Arnold, in California, United States, is home to roughly 3,800 people in the Pacific Time Zone at 38.3°N latitude.
In 2025, Arnold recorded an average annual temperature of 54°F. The hottest temperatures reached 93°F in August; the coolest were 19°F in March. Total precipitation for the year was 40 inches, with the wettest month being February. Snowfall for the year totaled approximately 12 inches.
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