Castle Junction Temperature by Month

The average annual maximum temperature in Castle Junction, Kootenay National Park, Canada is 3°C (37°F), with daytime highs ranging from -11°C (12°F) in December to 17°C (63°F) in July. This page covers monthly averages, day-night differences, and how Castle Junction compares to cities worldwide.

The climate in Castle Junction is known for significant temperature differences throughout the year. At night, this contrast is just as clear, with lows ranging from 4°C (39°F) in July to -19°C (-2°F) in December.

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

Temperatures tend to bottom out between 4 AM and 6 AM, then climb to their daily peak around 3 PM. July, the warmest month, sees 255 hours of sunshine.

The chart below shows the average temperature throughout the year:

Castle Junction's average annual maximum temperature is 3°C (37°F). To put that in context, here's how it compares to a few well-known destinations:

Seville, Spain averages 23°C (73°F) a year, one of the warmer cities in Western Europe, with long hot summers.

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

Osaka, Japan averages 22°C (72°F) annually, with hot humid summers, mild winters, and pleasant spring and autumn seasons.

Melbourne, Australia averages 20°C (68°F) annually, known for unpredictable weather, with four seasons sometimes happening in one day.

Temperature alone doesn't tell the whole story, humidity plays a big role in how warm or cold it actually feels. High humidity in summer makes the heat feel more intense, particularly once temperatures climb above 25°C. In winter, the same humidity can make cold air feel sharper than the thermometer suggests.

In the cooler months, when temperatures drop below 10°C, high humidity makes the cold feel more cutting than it would in dry conditions.

In Castle Junction, December is the coolest month, with average highs of -11°C (12°F) and humidity around 66%, considered high. For a full picture, see our humidity page.

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 Castle Junction this rarely lasts long on the ground.

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