Sudbury (ON) Temperature by Month

The average annual maximum temperature in Sudbury, Ontario, Canada is 11°C (52°F), with daytime highs ranging from -6°C (21°F) in January to 26°C (79°F) in July. This page covers monthly averages, day-night differences, and how Sudbury compares to cities worldwide.

The climate in Sudbury is dynamic, ranging widely from very cold in winter to comfortable in summer. Nights are significantly colder, with lows dropping from 13°C (55°F) in July to -17°C (1°F) in January.

The chart below illustrates the average maximum day and minimum night temperatures in Sudbury 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:

Sudbury's average annual maximum temperature is 11°C (52°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.

Glasgow, Scotland averages 13°C (55°F) a year, mild but often grey, with cold winters and rarely hot summers.

Buenos Aires, Argentina averages 23°C (73°F) a year, with hot summers and mild winters, and seasons reversed compared to Europe.

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.

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 Sudbury this rarely lasts long on the ground.

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