Climate and monthly weather forecastGrand Junction, CO

The climate of Grand Junction

Grand Junction, located in the mid-latitude steppe region, adheres mostly to the BSk predominate climate according to Köppen climate classification. These circumstances provide a semi-arid climate with hot summers and cold winters. The temperature varies significantly throughout the year, with highs reaching 86.9°F (30.5°C) in July and dipping as low as 18.3°F (-7.6°C) in January.

The town experiences a broad range of humidity levels, peaking at 78% in January and decreasing to 29% by June. Rainfall is a common phenomenon, sprinkling the town with a minimum of 0.51" (13mm) in June to a maximum of 1.06" (27mm) in March. Nonetheless, there are less rainy days in November, only 5.5 days, compared with 10.4 days in March.

Snowfall is predominantly accentuated in the winter months, from December to February, with January encountering the most significant snowfall of 3.74" (95mm). Cloud cover varies moderately, with December displaying the highest percentage at 31%, and June showing the lowest at 11%. The pressure also shows a slight fluctuation throughout the year, maintaining between 29.9" (759mm) in May and 30.27" (769mm) in January.

The best time to visit Grand Junction

June emerges as the prime month to explore Grand Junction, affirmed by the appropriate weather conditions. The temperature reaches a high of 82.2°F (27.9°C), providing an ideal environment for outdoor activities. Furthermore, the humidity drops substantially to 29%, manifesting a comfortable atmosphere. The area also receives a minimum rainfall of only 0.51" (13mm) and experiences a limited number of rainy days, merely 5.6 days.

The worst time to visit Grand Junction

Touring Grand Junction in the winter months might not be a delightful experience for everyone. Particularly in January, where the temperature hits rock bottom at 18.3°F (-7.6°C). The high amount of snowfall, an ample 3.74" (95mm), also contributes to the adverse conditions for travelling. Furthermore, in this period, the high humidity, peaking at 78%, may result in quite discomforting conditions.

Spring weather in Grand Junction

Spring in Grand Junction, from March to May, signifies warming temperatures, with highs ranging from 50.7°F (10.4°C) to 69.1°F (20.6°C). Rainfall in this season moderately varies from 1.06" (27mm) in March to 0.55" (14mm) in May. March sees an elevated number of rainy days with 10.4, which gradually recedes to 7.7 in May. The humidity also follows a descending trend, starting at 55% in March and dropping to 37% in May

Summer weather in Grand Junction

With summer extending from June to August, Grand Junction's average high temperatures escalate from a pleasant 82.2°F (27.9°C) in June to a warm 86.9°F (30.5°C) in July, before tapering off slightly to 84.2°F (29°C) in August. Even though June sees the least rainfall of 0.51" (13mm) of the year, by August, it increases to 0.75" (19mm). However, the number of rainy days remains quite similar, oscillating around 8.7 days in July and August.

Autumn weather in Grand Junction

Autumn in Grand Junction brings an appreciable coolness, with temperatures retreating from 76.5°F (24.7°C) in September to a mild 49.1°F (9.5°C) in November. Precipitation and the number of rainy days coincide at 0.63" (16mm) and 7.3 days in September, then slight increases to 0.94" (24mm) and 7.4 days in October. November sees the least number of rainy days at 5.5 days though receives 0.55" (14mm) of rain.

Winter weather in Grand Junction

Winter spans from December until February and most notably, features temperatures fluctuating between 18.3°F (-7.6°C) and 39.6°F (4.2°C). Heavier snowfall becomes apparent in this period, peaking at 3.74" (95mm) in January. The waning daylight hours contribute to the cold weather, with the shortest span of 9.5 hours occurring in December and gradually increasing to 10.8 hours by February.

Weather in January

January in Grand Junction, Colorado sees a mingling of chilly temperatures and moderate humidity. The city experiences the year's coldest temperatures with highest around 34.9°F (1.6°C) and lowest around 18.3°F (-7.6°C). An overall sense of freshness pervades as snowfalls are not uncommon, adding to the overall humidity. Weather in January »

Weather in February

Transitioning into February, Grand Junction witnesses a gradual climb in temperatures. Compared to January, both maximum and minimum temperatures rise, reaching up to 39.6°F (4.2°C) and 23.5°F (-4.7°C) respectively. The relative humidity decreases, the city experiencing less snowfall than in January, although winter conditions persist. Weather in February »

Weather in March

By March, Grand Junction begins to shed the harsh winter temperatures. The weather is notably warmer compared to February, with a significant leap in highest temperatures up to 50.7°F (10.4°C). Sunshine hours rise, adding to the perception of warming days as winter fades away. Weather in March »

Weather in April

April sees a resurgence of pleasant conditions in Grand Junction. An increase in temperature is notable, with highs soaring to 58.6°F (14.8°C). The transition from winter to spring is complete, with snowfall becoming highly unlikely. Weather in April »

Weather in May

May in Grand Junction marks the onset of summer. Warmer temperatures prevail, resulting in a distinct shift from Spring, with highs nearly reaching 70.1°F (21.2°C). Days continue to grow longer, and with the least amount of annual rain, outdoor activities become very popular. Weather in May »

Weather in June

June in Grand Junction greets the summer solstice with temperatures nearing 82.2°F (27.9°C). As the hottest month of the year, precautions against heat-related conditions are warranted. Enduring the longest daylight hours, the city bathes in an abundant 14.9 hours of light. Weather in June »

Weather in July

Taking over from June, July continues the summer spell with maximum temperatures averaging around 86.9°F (30.5°C). Despite possessing the highest average temperatures, it does not experience as much sunshine as the previous month. Weather in July »

Weather in August

August is a month of mild changes for Grand Junction. The weather accommodates a mild decrease in highest temperature to 84.2°F (29°C), still providing ample warmth. The humidity remains low despite being peak summer month, with rain in moderation. Weather in August »

Weather in September

In September, Grand Junction ushers in the first hints of autumn as temperatures start to decrease. Weather conditions take a gentle turn from the peak summer heat, with temperatures dropping to a pleasant 76.5°F (24.7°C) at most. Weather in September »

Weather in October

October in Grand Junction signifies the arrival of quintessential fall weather. A sharp decline in temperatures sees a lower limit of 40.5°F (4.7°C), signaling the beginning of cooler days and even colder nights. Diverse weather patterns emerge as the occasional snowfall enriches the fall foliage. Weather in October »

Weather in November

November in Grand Junction is marked by a transition to winter-like conditions. With a decrease in highest temperature to as low as 49.1°F (9.5°C), crispness permeates the air. Snowfall occurrences increase and while they may not be frequent, they do contribute to the overall moisture. Weather in November »

Weather in December

December introduces winter in full swing, as temperatures continue to drop with a decrease to 36.3°F (2.4°C) at most. Grand Junction experiences the most snowfall during this month, ensuring a white Christmas. The city also sees the shortest daylight hours, plunging it into longer nights. Weather in December »