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Climate in Grand Junction, Colorado: Monthly Weather Averages

By the AverageClimate Editorial Team · Last updated: October 2026

Grand Junction sits at 4,858 feet above sea level, and its climate, as recorded at the Grand Junction Walker Field, CO station, runs to a yearly mean of 53.2°F. The warmest month is July, averaging 79.2°F with typical highs of 94.5°F; the coldest is January, averaging 27.7°F with lows around 17.3°F. Across a normal year the city receives 9.1 in of precipitation and 17.7 in of snow. The full month-by-month picture below comes from the official 1991–2020 U.S. Climate Normals — the 30-year averages the National Weather Service itself uses — so it describes the Grand Junction climate you should actually plan around, whether you are timing a visit, weighing a move, or just settling an argument about which month is best.

Grand Junction climate month by month

The table below is the complete 1991–2020 normals profile for Grand Junction: average high, average low and mean temperature, rainfall, and snowfall for every month. Read down the Mean column to feel the year's rhythm — Grand Junction's temperature range runs from 27.7°F in January to 79.2°F in July.

How to read the colors:below freezingcoldcoolmildwarmhot. Bands are colored by each cell's own temperature, so a whole year reads at a glance.

Grand Junction through the seasons

Winter in Grand Junction averages highs of 38.1–46.4°F and lows of 17.3–24.1°F, a seasonal mean of 30.5°F. The three months together bring 1.7 in of precipitation — about 19% of the city's yearly total — with January the wettest of the three at 0.61 in. Snowfall averages 12.6 in over the season, most of it in December (5.2 in). Average temperatures sit below freezing, so this is the heart of the heating season: expect snow-covered ground, icy mornings, and short, cold days as the local norm rather than the exception.

Spring in Grand Junction averages highs of 58.3–76.8°F and lows of 31.7–47.1°F, a seasonal mean of 53.0°F. The three months together bring 2.6 in of precipitation — about 29% of the city's yearly total — with April the wettest of the three at 0.98 in. Snowfall averages 2.8 in over the season, most of it in March (1.8 in). The season is a transition: the average temperature climbs 17.0°F from March to May, and by late spring Grand Junction is firmly into mild territory.

Summer in Grand Junction averages highs of 89.2–94.5°F and lows of 56.8–63.9°F, a seasonal mean of 76.2°F. The three months together bring 1.9 in of precipitation — about 21% of the city's yearly total — with August the wettest of the three at 0.92 in. Summers are hot in the classic sense — most afternoons reach the 90s, and shade, water, and air conditioning shape the daily routine.

Fall in Grand Junction averages highs of 51.8–81.7°F and lows of 27.5–52.5°F, a seasonal mean of 53.3°F. The three months together bring 2.8 in of precipitation — about 31% of the city's yearly total — with September the wettest of the three at 1.19 in. Snowfall averages 2.3 in over the season, most of it in November (1.9 in). Temperatures ease off through the season — the monthly mean drops 27.5°F from September to November — and fall is when Grand Junction's weather turns cooler and wetter, with the first freezes arriving by November.

Best and worst months to visit Grand Junction

Ranking every month by its normals — mild mean temperatures score best, heavy rain and snow count against — the most comfortable months to visit Grand Junction are:

JuneAugustSeptember

June leads the list: average highs of 89.2°F, lows of 56.8°F, and 0.41 in of rain, with snow a non-factor at 0.0 in. The other picks, August and September, offer the same balance in Grand Junction's mild stretch of the year. At the other end, January is usually the month to avoid — deep-winter cold, with a mean temperature of 27.7°F and 0.61 in of precipitation plus 4.5 in of snow.

How Grand Junction compares

Across the 124 cities in our dataset, the typical city averages 57.9°F for the year and 36.3 in of precipitation. Grand Junction runs 4.7°F cooler than that typical city and drier by 27.3 in a year, ranking #80 of 124 for annual warmth and #119 of 124 for precipitation (wettest first). Its year-round temperature swing — warmest month minus coldest — is 51.5°F, which puts it in the strongly continental, four-real-seasons camp.

Within Colorado, Grand Junction is the warmest of the cities we track. See the Colorado climate overview for the full state comparison, including Grand Junction (warmest, 53.2°F yearly mean) and Colorado Springs (coolest, 50.4°F).

Planning notes for Grand Junction

For anyone relocating: average overnight lows drop below freezing in 5 months (January, February, March, November, December), so heating, winter tires, and pipe protection are real seasonal concerns; 2 months average highs of 90°F or more, making air conditioning a core cost of summer life; days and nights differ by 26.8°F on average — a big desert-style swing that rewards dressing in layers year-round; 5 months of the year average between 55°F and 80°F, the band most people find comfortable without heating or cooling. Those four facts, all straight from the normals table above, shape everything from a Grand Junction wardrobe to its utility bills.

Grand Junction climate FAQ

Source: 1991–2020 U.S. Climate Normals, NOAA National Centers for Environmental Information (NCEI) — ncei.noaa.gov. Station: Grand Junction Walker Field, CO (USW00023066), elevation 4,858 ft. Figures checked October 2026.