Arnold (CA) Temperature by Month

The average annual maximum temperature in Arnold, California, United States of America is 19°C (66°F), with daytime highs ranging from 9°C (48°F) in December to 30°C (86°F) in July. This page covers monthly averages, day-night differences, and how Arnold compares to cities worldwide.

With significant temperature fluctuations, Arnold enjoys distinct seasons year-round. Nighttime lows range from 15°C (59°F) in July to 0°C (32°F) in December.

The chart below illustrates the average maximum day and minimum night temperatures in Arnold by month:

Temperatures tend to bottom out between 4 AM and 6 AM, then climb to their daily peak around 3 PM.

The chart below shows the average temperature throughout the year:

Arnold's average annual maximum temperature is 19°C (66°F). To put that in context, here's how it compares to a few well-known destinations:

Rome, Italy averages 20°C (68°F) annually, with reliably warm summers and comfortable winters.

Interlaken, Switzerland averages 8°C (46°F) a year, with cold winters and cool summers thanks to its Alpine setting.

Beijing, China averages 20°C (68°F) annually, but with big seasonal swings, very cold winters and hot summers.

Brisbane, Australia averages 26°C (79°F) a year, with warm winters and hot, humid summers.

Climate temperature data is typically calculated as a 30-year average. This smooths out year-to-year variability and gives a more reliable picture of what a place is actually like, rather than what happened in any single unusual year.

The readings come from a range of sources, land-based weather stations, ocean buoys, ships, and satellites. That data is collected by weather services around the world, then pooled, quality-checked, and averaged to produce the climate records you see here.

For cities and regions with significant elevation, altitude is one of the biggest factors shaping local temperatures. As a rule of thumb, temperatures fall by around 6°C for every 1,000 metres gained, so a city at 2,000 metres will typically be around 12°C cooler than a city at sea level in the same region. Higher ground also tends to see more dramatic day-to-night temperature swings, since thinner air loses heat faster after sunset.

For more on Arnold's weather, including monthly rainfall, sunshine hours, and humidity, visit our Arnold climate page.