Understanding Grand Junction, Colorado's Weather
Grand Junction's Climate
Grand Junction, Colorado, is nestled in the Rocky Mountains and the Great Basin, and has a semi-arid climate. This means that while the summers are hot and dry, the winters are cold and dry. Grand Junction is known for its warm spring and summer temperatures and dry, mild winters with temperatures usually around the freezing point.
Precipitation
Grand Junction, Colorado, has an average annual precipitation of about 11.8 inches, with most of that occurring from May through September in the form of thunderstorms. While snowfall is rare in the city, it does occur from December through March, with an average annual snowfall of about 22 inches.
Average Temperatures
Grand Junction, Colorado, has an average annual high temperature of about 64.4°F (18.0°C) and an average annual low temperature of about 32.1°F (0.1°C). The average monthly high temperature ranges from 48°F (9°C) in January to 88°F (31°C) in July. The average monthly low temperature ranges from 22°F (-6°C) in January to 60°F (16°C) in July.
Air Quality
Grand Junction, Colorado, has generally good air quality, with some occasional days of high ozone and particulate levels due to regional air pollution. The Colorado Department of Public Health and Environment monitors air quality in the region and provides daily air quality forecasts on its website.
Unusual Weather Phenomena
Grand Junction, Colorado, is located in a region of the Rocky Mountains known for its severe thunderstorms and severe winter storms. The city also experiences occasional hailstorms, flash flooding, and tornadoes. Grand Junction is also known for its sunny weather and abundant sunshine, with an average of more than 300 sunny days each year.