Geyserville (CA) Temperature by Month
The average annual maximum temperature in Geyserville, California, United States of America is 23°C (73°F), with daytime highs ranging from 14°C (57°F) in December to 31°C (88°F) in July. This page covers monthly averages, day-night differences, and how Geyserville compares to cities worldwide.
Geyserville Monthly Temperatures
In Geyserville, temperatures differ significantly between summer and winter months. Nighttime lows reflect this range, dropping from 12°C (54°F) in July to 4°C (39°F) in December.
The chart below illustrates the average maximum day and minimum night temperatures in Geyserville by month:
The coolest part of the day is typically between 4 AM and 6 AM, while 3 PM is usually the warmest, when solar heating is at its peak. July, the city's warmest month, averages 306 hours of sunshine.
The chart below shows the average temperature throughout the year:
Temperature: Geyserville vs the United States of America
The map below shows the annual temperature across the United States of America. You can also select individual months if you want to compare a specific time of year.
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Geyserville vs World: Temperature Compared
Geyserville's average annual maximum temperature is 23°C (73°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.
Toronto, Canada averages 13°C (55°F) annually, with cold snowy winters balanced by genuinely warm summers.
Seoul, South Korea averages 18°C (64°F) a year, with four clear seasons, cold winters, and hot humid summers.
Melbourne, Australia averages 20°C (68°F) annually — known for unpredictable weather, with four seasons sometimes happening in one day.
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 Geyserville's weather — including monthly rainfall, sunshine hours, and humidity — visit our Geyserville climate page.
