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Contents
- The climate of Grand Junction
- The best time to visit Grand Junction
- The worst time to visit Grand Junction
- Spring weather in Grand Junction
- Summer weather in Grand Junction
- Autumn weather in Grand Junction
- Winter weather in Grand Junction
- Weather in January
- Weather in February
- Weather in March
- Weather in April
- Weather in May
- Weather in June
- Weather in July
- Weather in August
- Weather in September
- Weather in October
- Weather in November
- Weather in December
- Frequently asked questions
- Average temperature
- Average pressure
- Average wind speed
- Average humidity
- Average rainfall
- Average rainfall days
- Average snowfall
- Average snowfall days
- Average daylight
- Average sunshine
- Average sunshine days
- Average UV index
- Average cloud cover
- Average visibility
The scenic Grand Junction in Colorado with the iconic Colorado River and high hills nearby
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 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 »
Updated: Jul 9, 2024
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
What is the coldest month?
January is the month when Grand Junction sees the average lowest temperatures, with a high of 34.9°F (1.6°C) and a low of 18.3°F (-7.6°C).
What is the most humid month?
With an average relative humidity of 78%, January is the most humid month.
How many days does it rain?
Throughout the year, there are 93.6 rainfall days, and 8.46" (215mm) of precipitation is accumulated.
When does it snow?
Months with snowfall are January through April, October through December.
How much does it snow?
Throughout the year, there are 28.3 snowfall days, and 11.5" (292mm) of snow is accumulated.
What is the month with the least sunshine?
With an average of 6.3h of sunshine, January has the least sunshine of the year.
What are the months with the lowest UV index?
The months with the lowest UV index are January, February, November and December, with an average maximum UV index of 2.
What is the wettest month?
March is the month with the most rainfall. Rain falls for 10.4 days and accumulates 1.06" (27mm) of precipitation.
When is Daylight Saving Time (DST)?
On Sunday, March 10. 2024, at 2:00 am, Daylight Saving Time starts, and the time zone changes from MST to MDT. Daylight Saving Time ends Sunday, November 3. 2024, at 2:00 am, and the time zone reverts from MDT to MST.
When it does not snow?
May through September are months without snowfall.
What is the least humid month?
June is the least humid month, with an average relative humidity of 29%.
What is the driest month?
The month with the least rainfall in Grand Junction, Colorado, is June, when the rain falls for 5.6 days and typically collects 0.51" (13mm) of precipitation.
When are the longest days?
The month with the longest days is June, with an average of 14h and 54min of daylight.
What month has the most sunshine?
June has the most sunshine of the year, with an average of 12h of sunshine.
When is the highest UV index?
The months with the highest UV index are June through August, with an average maximum UV index of 6.
What is the warmest month?
The warmest month is July, with an average high-temperature of 86.9°F (30.5°C) and an average low-temperature of 60.4°F (15.8°C).
When does it snow the most?
The month with the most snowfall is December, when snow falls for 6.9 days and typically aggregates up to 3.74" (95mm) of snow.
What is the month with the shortest days?
December has the shortest days of the year, with an average of 9h and 30min of daylight.
Average temperature
Grand Junction, CO
The warmest month (with the highest average high temperature) is July (86.9°F).
The month with the lowest average high temperature is January (34.9°F).
The month with the highest average low temperature is July (60.4°F).
The coldest month (with the lowest average low temperature) is January (18.3°F).
Average pressure
Grand Junction, CO
- Average pressure in January:
30.27"Hg - Average pressure in February:
30.13"Hg - Average pressure in March:
30.03"Hg - Average pressure in April:
29.92"Hg - Average pressure in May:
29.9"Hg - Average pressure in June:
29.9"Hg
- Average pressure in July:
29.98"Hg - Average pressure in August:
30"Hg - Average pressure in September:
30"Hg - Average pressure in October:
30.04"Hg - Average pressure in November:
30.13"Hg - Average pressure in December:
30.19"Hg
The month with the highest atmospheric pressure is January (30.27"Hg).
The months with the lowest atmospheric pressure are May and June (29.9"Hg).
Average wind speed
Grand Junction, CO
- Average wind speed in January:
4.2mph - Average wind speed in February:
5.3mph - Average wind speed in March:
6.7mph - Average wind speed in April:
7.3mph - Average wind speed in May:
7.3mph - Average wind speed in June:
7.5mph
- Average wind speed in July:
6.2mph - Average wind speed in August:
5.9mph - Average wind speed in September:
6.2mph - Average wind speed in October:
5.6mph - Average wind speed in November:
5.2mph - Average wind speed in December:
4.5mph
The windiest month (with the highest average wind speed) is June (7.5mph).
The calmest month (with the lowest average wind speed) is January (4.2mph).
Average humidity
Grand Junction, CO
The month with the highest relative humidity is January (78%).
The month with the lowest relative humidity is June (29%).
Average rainfall
Grand Junction, CO
- Average rainfall in January:
0.67" - Average rainfall in February:
0.71" - Average rainfall in March:
1.06" - Average rainfall in April:
0.67" - Average rainfall in May:
0.55" - Average rainfall in June:
0.51"
- Average rainfall in July:
0.63" - Average rainfall in August:
0.75" - Average rainfall in September:
0.63" - Average rainfall in October:
0.94" - Average rainfall in November:
0.55" - Average rainfall in December:
0.79"
The wettest month (with the highest rainfall) is March (1.06").
The driest month (with the least rainfall) is June (0.51").
Average rainfall days
Grand Junction, CO
- Average rainfall days in January:
7.3 days - Average rainfall days in February:
7.2 days - Average rainfall days in March:
10.4 days - Average rainfall days in April:
10.3 days - Average rainfall days in May:
7.7 days - Average rainfall days in June:
5.6 days
- Average rainfall days in July:
8.7 days - Average rainfall days in August:
8.7 days - Average rainfall days in September:
7.3 days - Average rainfall days in October:
7.4 days - Average rainfall days in November:
5.5 days - Average rainfall days in December:
7.5 days
The month with the highest number of rainy days is March (10.4 days).
The month with the least rainy days is November (5.5 days).
Average snowfall
Grand Junction, CO
The month with the highest snowfall is December (3.74").
The months with the least snowfall are May, June, July, August and September (0").
Average snowfall days
Grand Junction, CO
- Average snowfall days in January:
7.9 days - Average snowfall days in February:
7.3 days - Average snowfall days in March:
2.2 days - Average snowfall days in April:
1.3 days - Average snowfall days in May:
0 days - Average snowfall days in June:
0 days
- Average snowfall days in July:
0 days - Average snowfall days in August:
0 days - Average snowfall days in September:
0 days - Average snowfall days in October:
0.5 days - Average snowfall days in November:
2.2 days - Average snowfall days in December:
6.9 days
The month with the highest number of snowfall days is January (7.9 days).
The months with the least snowfall days are May, June, July, August and September (0 days).
Average daylight / Average sunshine
Grand Junction, CO
- Average daylight in January:
9h and 5min - Average daylight in February:
10h and 5min - Average daylight in March:
12h and 0min - Average daylight in April:
13h and 2min - Average daylight in May:
14h and 2min - Average daylight in June:
14h and 5min
- Average daylight in July:
14h and 4min - Average daylight in August:
13h and 4min - Average daylight in September:
12h and 2min - Average daylight in October:
11h and 1min - Average daylight in November:
10h and 0min - Average daylight in December:
9h and 3min
The month with the longest days is June (Average daylight: 14h and 54min).
The month with the shortest days is December (Average daylight: 9h and 30min).
- Average sunshine in January:
6h and 2min - Average sunshine in February:
6h and 5min - Average sunshine in March:
8h and 4min - Average sunshine in April:
11h and 1min - Average sunshine in May:
11h and 4min - Average sunshine in June:
12h and 0min
- Average sunshine in July:
11h and 5min - Average sunshine in August:
11h and 5min - Average sunshine in September:
11h and 0min - Average sunshine in October:
7h and 2min - Average sunshine in November:
7h and 2min - Average sunshine in December:
6h and 4min
The month with the most sunshine is June (Average sunshine: 12h and 0min).
The month with the least sunshine is January (Average sunshine: 6h and 18min).
Average sunshine days
Grand Junction, CO
- Average sunshine days in January:
18.5 days - Average sunshine days in February:
15.8 days - Average sunshine days in March:
18.3 days - Average sunshine days in April:
16.5 days - Average sunshine days in May:
20.4 days - Average sunshine days in June:
21.8 days
- Average sunshine days in July:
16.6 days - Average sunshine days in August:
16.6 days - Average sunshine days in September:
19.3 days - Average sunshine days in October:
21.4 days - Average sunshine days in November:
22.3 days - Average sunshine days in December:
19.5 days
The month with the most sunshine days is November (22.3 days).
The month with the least sunshine days is February (15.8 days).
Average UV index
Grand Junction, CO
The months with the highest UV index are June, July and August (UV index 6).
The months with the lowest UV index are January, February, November and December (UV index 2).
Average cloud cover
Grand Junction, CO
The month with the most cloud cover is January (Cloud cover 31).
The months with the least cloud cover are June and September (Cloud cover 11).
Average visibility
Grand Junction, CO
The months with the highest visibility are February, March, April, May, June, July, August, September, October, November and December (6mi).
The month with the lowest visibility is January (5mi).
Grand Junction, Colorado, USA
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