Guerneville (CA) Temperatures: Monthly Averages and Year-Round Insights
On this page, we’ll explore Guerneville’s temperature statistics in detail, including day and night variations and monthly averages. We’ll also compare the annual temperature to other cities in the United States of America.
Monthly Temperature Averages
Visitors to Guerneville can expect significant temperature changes throughout the year. Average maximum daytime temperatures reach a comfortable 28°C in July. In December, the coolest month of the year, temperatures drop to a moderate 14°C. At night, minimum temperatures can drop even lower, averaging around 3°C.
The chart below illustrates the average maximum day and minimum night temperatures in Guerneville by month:
The coldest temperatures are usually recorded between 4 AM and 6 AM, while the hottest temperatures occur near 3 PM, at the peak of the sun's warmth. July, the city’s warmest month, receives 306 hours of sunshine.
The chart below shows the average temperature throughout the year:
December, the city’s coldest month, receives about 243 mm of rainfall spread over roughly 13 days. For more information, please visit our Guerneville Precipitation page.
Annual Temperatures in the United States of America Compared
The map below shows the annual temperature across the United States of America. You can also select the different months in case you are interested in a specific month.
very warm
warm
pleasant
moderate
cold
very cold
Guerneville Temperatures Compared World Wide
Guerneville’s average annual maximum temperature is 22°C. Let’s compare this with some popular tourist destinations:
In Lisbon, Portugal, the average annual temperature is 21°C, offering warm summers and mild, rainy winters.
Meanwhile, Queenstown, New Zealand, the average annual temperature is significantly lower at 10°C, with mild summers and cold winters.
The climate in San Francisco, USA, is mild, with an average annual temperature of 19°C and minimal seasonal variation.
Adelaide, Australia, enjoys warm summers and mild winters, with an average annual temperature of 21°C.
How are these Temperatures Measured?
Generally, temperature data depicting climate is usually given over a 30-year average in order to reduce short-term fluctuations and reveal better long-term trends in climate conditions.
This temperature data is taken from land-based thermometers, ocean buoys, ships, and satellites. These measurements are transmitted to weather stations and climate centers around the globe where they are processed, averaged, and analyzed in order to monitor the trends and create climate models.
Global Warming and Its Effects
Climate change is affecting worldwide temperatures, including in Guerneville. It has massive impacts on both local and global levels:
- Global Temperature Rise: The average global land and sea temperatures have risen by about 1.2°C since pre-industrial times.
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Local Impacts: Most regions of the world are witnessing warmer winters with fewer frost and snowfall days. The global frequency and severity of heatwaves have increased. For example, Europe's summers of 2018, 2019, and 2020 all broke records. Summers are also becoming drier; however, during winter, inland regions have experienced increased rainfall. This has caused elevated river levels and more cases of flooding.
Many countries are experiencing earlier springs and later autumns. This is why some bird species have shifted their migration dates.
For more detailed information about Guerneville’s weather, including monthly rainfall, sunshine hours, and humidity levels, visit our Guerneville climate page.
Current temperature in Guerneville (CA)
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