Jacksonville (OR) Temperature by Month

The average annual maximum temperature in Jacksonville, Oregon, United States of America is 19°C (66°F), with daytime highs ranging from 8°C (46°F) in December to 32°C (90°F) in July. This page covers monthly averages, day-night differences, and how Jacksonville compares to cities worldwide.

The climate in Jacksonville is dynamic, ranging widely from chilly in winter to very warm in summer. Nights are significantly colder, with lows dropping from 13°C (55°F) in July to -1°C (30°F) in December.

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

The minimum temperature is often recorded between 4 AM and 6 AM, while the highest temperature is usually reached at 3 PM, when the sun's heating effect is strongest.

The chart below shows the average temperature throughout the year:

Jacksonville'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:

Lisbon, Portugal averages 21°C (70°F) annually, warm summers, mild winters, and rain mainly in the cooler months.

Zermatt, Switzerland averages just 4°C (39°F) annually due to its altitude, with very cold winters and cool summers even at its warmest.

New York City, USA averages 17°C (63°F) a year, with hot humid summers and cold winters that bring regular snowfall.

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.

Seasonal temperature shifts influence more than just how warm it feels, they also drive changes in rainfall, cloud cover, and wind patterns throughout the year.

Warmer air holds more moisture, which tends to mean heavier or more frequent rain during the warmer months. When temperatures drop in winter, any precipitation that does fall is more likely to come as snow or sleet, though in Jacksonville this rarely lasts long on the ground.

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