Glacier Temperature by Month

The average annual maximum temperature in Glacier, United States of America is 12°C (54°F), with daytime highs ranging from 3°C (37°F) in December to 21°C (70°F) in July. This page covers monthly averages, day-night differences, and how Glacier compares to cities worldwide.

Depending on the time of the year, temperatures range from pleasant to cold in Glacier. Nighttime lows follow the same pattern, ranging from 11°C (52°F) to -2°C (28°F).

The chart below illustrates the average maximum day and minimum night temperatures in Glacier 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 281 hours of sunshine.

The chart below shows the average temperature throughout the year:

Glacier's average annual maximum temperature is 12°C (54°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.

Beijing, China averages 20°C (68°F) annually, but with big seasonal swings, very cold winters and hot summers.

Perth, Australia averages 25°C (77°F) annually, with a classic Mediterranean climate, hot dry summers and mild wet winters.

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 Glacier this rarely lasts long on the ground.

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