Boise Climate & Monthly Temperature Overview – United States

Climate

Boise enjoys a semi-arid climate with distinct seasons. Winters are cold, with average January temperatures dropping to around freezing. Snow is common during this time, although it doesn’t typically accumulate heavily. Springs are mild and pleasant, with temperatures rising steadily towards summer. Summers are hot and dry, with average July highs exceeding 90°F. The heat is often accompanied by low humidity, making the conditions relatively bearable.

Average Weather Year Round

January: Average temperature: 27°F, Precipitation: 1.3 inches
April: Average temperature: 50°F, Precipitation: 1 inch
July: Average temperature: 92°F, Precipitation: 0.2 inches
October: Average temperature: 59°F, Precipitation: 0.9 inches

In summary, Boise experiences a wide range of temperatures throughout the year, with cold winters, mild springs, hot and dry summers, and cool autumns. The precipitation is relatively low throughout the year, with most occurring during the winter months.

Average Temperature in Boise, United States

Boise, the capital of Idaho, experiences a semi-arid climate, with distinct seasonal temperature variations. The average temperature throughout the year is a pleasant 51.6°F (10.9°C). Summers in Boise are typically warm and dry, with average temperatures ranging from 68.8°F (20.5°C) in September to 89.6°F (32°C) in July. During these months, the city receives the least amount of rainfall, with an average of only 0.00 to 0.12 inches.

In contrast, winters in Boise are cold and snowy, with average temperatures dropping to 32.5°F (0.3°C) in December. The city experiences an average of 21.1 inches of snowfall annually, with the majority occurring between December and March. Despite the cold, Boise’s winters are generally sunny, with an average of 146 clear days per year.

Cloud Coverage in Boise

Boise, Idaho, experiences varying degrees of cloud coverage throughout the year. during the winter months (December-February), cloud cover is typically at its highest, with an average of between 50% and 65% of the sky covered in clouds. This is due to the frequent storms and precipitation that occur during this time of year.

Seasonal Variations in Cloud Cover

As spring arrives (March-May), cloud cover begins to decrease, with an average of between 30% and 45% of the sky covered in clouds. This decrease in cloud cover is due to the drier and warmer weather conditions that typically prevail during this time of year. By summer (June-August), cloud cover reaches its lowest point, with an average of only 15% to 25% of the sky covered in clouds. Clear skies and sunshine are common during this time of year. In the fall (September-November), cloud cover begins to increase again, with an average of between 30% and 45% of the sky covered in clouds. The increase in cloud cover is due to the return of cooler and wetter weather conditions.

Seasonal Precipitation

Boise, located in the northwestern United States, experiences a semi-arid climate with distinct seasonal precipitation patterns. During the winter months (November to March), Boise receives the majority of its annual precipitation, typically in the form of snow. The average annual snowfall ranges between 30 to 40 inches, contributing significantly to the city’s water supply. In contrast, the summer months (June to September) are relatively dry, with occasional thunderstorms bringing sporadic rainfall.

Annual Precipitation and Variability

On average, Boise receives approximately 12 inches of precipitation annually, with a high degree of interannual variability. The wettest year on record was 1950, with nearly 20 inches of precipitation, while the driest year was 1994, with under 5 inches of precipitation. This variability highlights the importance of reliable water management strategies in the face of potential droughts or floods. Overall, Boise’s precipitation patterns are influenced by its location on the western edge of the Rocky Mountains, where prevailing winds typically carry moist air from the Pacific Ocean during the winter months.

Historical Rainfall Patterns

Boise, situated in southwestern Idaho, experiences a continental climate with distinct seasonal variations in precipitation. Historically, the city has exhibited a marked trend of low annual rainfall, averaging approximately 12 inches (30 centimeters). The majority of rainfall occurs during the spring and early summer months, from March to June. During this period, Boise typically receives around 6 inches of precipitation, often in the form of mild showers or occasional thunderstorms. Summer rainfall is typically sporadic and accounts for a relatively small proportion of the annual total.

Seasonal Variability and Extreme Events

The distribution of rainfall in Boise is not uniform throughout the year. During the winter months, from November to February, precipitation is minimal, with an average of less than 2 inches. Snowfall occasionally occurs during this period but is often light and short-lived. The autumn months, from September to October, also experience reduced rainfall compared to spring and early summer. However, extreme rainfall events can occur in Boise on rare occasions. In 1956, the city experienced a record-breaking rainfall of 6.24 inches within 24 hours, causing significant flooding in the area. Such events, while infrequent, highlight the potential for heavy precipitation and its potential impact on the city’s infrastructure and water management systems.

Historical Snowfall Patterns

Boise, Idaho receives an average of 19 inches of snow annually, making it one of the snowiest cities in the Pacific Northwest. Snowfall typically occurs between November and March, with the heaviest accumulations in January and February. While the city experiences occasional snowstorms, most snowfall occurs as light flurries or drizzle.

Seasonal Variations

Snowfall in Boise varies significantly from year to year. Some winters witness only a few inches of snow, while others receive record-breaking snowfall. The snowiest winter on record for the city was 1984-85, with a total accumulation of 82.3 inches. The driest winter on record was 1990-91, with only 1.9 inches of snow. In recent years, Boise has experienced a trend towards milder winters with less snowfall. This trend is attributed to climate change, which is causing warmer temperatures and a reduction in precipitation.

Sunrise and Sunset Times

Boise, located in the mountainous region of Idaho, experiences variations in sunrise and sunset times throughout the year. During the summer months, the sun rises early, around 5:30 AM, while sunset occurs late, around 9:15 PM. These long daylight hours provide ample time for outdoor activities and enjoying the scenic surroundings. In contrast, during the winter months, the days are shorter, with sunrise occurring around 7:15 AM and sunset around 5:00 PM. The shorter daylight hours encourage indoor activities and cozy evenings by the fireplace.

Daylight Savings Time

Like most of the United States, Boise observes Daylight Savings Time (DST). DST begins on the second Sunday of March, when clocks are moved forward one hour, and ends on the first Sunday of November, when clocks are moved back one hour. This adjustment provides additional daylight hours in the evening during the spring and summer months, allowing for more outdoor activities and recreation. However, it can also lead to temporary sleep disruptions and other adjustments as the body adjusts to the time change. Nevertheless, the benefits of extended daylight hours generally outweigh any minor inconveniences associated with DST.

Moon Phases in Boise, United States

The moon goes through a cycle of phases as it orbits the Earth. In Boise, Idaho, the moon’s phases can be observed throughout the year. The new moon, when the moon is not visible, occurs approximately every 29.5 days. The full moon, when the entire face of the moon is illuminated, occurs approximately every 29.5 days. In between the new moon and the full moon, the moon goes through a series of phases, including the waxing crescent, first quarter, waxing gibbous, waning gibbous, third quarter, and waning crescent.

Moonrise and Moonset Times in Boise, United States

The time of moonrise and moonset in Boise, Idaho, varies throughout the year. The moon rises and sets at different times each day due to the Earth’s rotation and the moon’s orbit around the Earth. The time of moonrise and moonset can be calculated using a variety of methods, including online calculators and mobile apps. It is also possible to find the time of moonrise and moonset in Boise, Idaho, by consulting a local newspaper or almanac.

Seasonal Humidity Variations

Boise’s humidity levels exhibit distinct seasonal patterns. During the summer months (June to August), the city experiences relatively low humidity, typically ranging from 20% to 40%. This dryness is influenced by the overall arid climate of the region, with warm and sunny conditions prevailing throughout the summer. As a result, the air holds less moisture, leading to a comfortable and drier environment.

In contrast, the winter months (December to February) bring a noticeable increase in humidity to Boise. Average humidity levels climb to between 60% and 80%, creating a more humid and occasionally muggy atmosphere. This shift is primarily attributed to the colder temperatures and the presence of precipitation, including snow and rain. The moisture retained in the cooler air contributes to the higher humidity levels, which can sometimes lead to condensation and fog formation during the winter season.

Annual Humidity Average

Over the course of the year, Boise’s average humidity hovers around 50%, reflecting the balance between the drier summer months and the more humid winter months. This average humidity level falls within the range considered comfortable for humans, as it allows for adequate moisture in the air without creating excessive dampness. Boise’s climate, with its moderate humidity levels, is generally suitable for both outdoor activities and indoor comfort throughout the year.

Sources of Wind in Boise

Boise’s prevailing wind direction is from the southwest, influenced by the surrounding mountains and the Snake River Valley. Southwest winds dominate in most seasons, particularly during summer and fall, bringing warmer temperatures and reduced humidity. However, Boise experiences various wind patterns throughout the year.

Seasonal Wind Patterns

During winter, Boise primarily experiences northwest winds, associated with cold fronts passing through the region. These winds can bring significant snowfall and reduced visibility. In spring, the wind direction becomes more variable, often shifting between westerly and southerly flows. The southerly winds transport moisture from the Pacific Ocean, leading to increased precipitation. During summer, Boise’s winds mainly originate from the southwest, creating hot and dry conditions. These southwesterly winds also contribute to the formation of evening thunderstorms, known as “Boise Bugs.”

Spring (April-May)

Spring is an ideal time to visit Boise due to its pleasant temperatures. The average high in April is 59°F (15°C), and the average high in May is 72°F (22°C). The city comes alive with blooming flowers, making it a beautiful time to explore the Boise Greenbelt and other outdoor areas. Additionally, the spring season offers various events, such as the Treefort Music Fest and the Idaho Potato Drop.

Summer (June-August)

Summer brings warm and sunny weather to Boise, with average highs in the 80s and 90s°F (27-32°C). While it can be hot during the day, the evenings provide a comfortable respite. The city hosts numerous outdoor festivals and concerts during the summer, including the Boise River Festival and the Idaho Shakespeare Festival. The summer months are also ideal for hiking, biking, and water sports in the surrounding mountains and rivers.

Solar Energy Potential in Boise, United States

Boise, the capital city of Idaho, experiences ample sunlight throughout the year. According to the National Renewable Energy Laboratory, Boise has an average of 5.5 peak sunlight hours per day. This makes it a suitable location for solar energy generation. The city government has also been supportive of solar development, enacting policies and incentives to promote the adoption of solar panels.

Benefits of Solar Energy for Boise

Utilizing solar energy in Boise offers several benefits. It can help reduce electricity costs for homeowners and businesses, promote environmental sustainability by reducing greenhouse gas emissions, and boost local economic growth by creating jobs in the solar industry. Additionally, solar panels can enhance property values and provide energy independence during power outages. With advancements in technology, the cost of solar panels has decreased in recent years, making them a more cost-effective investment.

General Topography of Boise

Boise, the capital city of Idaho, is geographically situated in a broad, flat valley known as the Boise River Valley. This valley floor is bordered by foothills to the north and south, rising gradually to the surrounding mountains. The Boise River meanders through the valley, creating a gentle slope from the foothills to the riverbanks. The city’s overall elevation is relatively low, with the valley floor averaging around 2,700 feet (823 meters) above sea level.

Surrounding Mountains and Foothills

To the north of Boise, the Boise Foothills rise steeply, forming a rugged landscape of rolling hills, canyons, and outcroppings. The foothills are primarily composed of granite and gneiss, and they extend for approximately 20 miles (32 kilometers) north of the city. Beyond the foothills, the Boise Mountains reach elevations of over 9,000 feet (2,743 meters), creating a dramatic backdrop to the valley. To the south of Boise, the Owyhee Mountains rise more gradually, forming a series of mesas and plateaus. The Owyhees are primarily composed of volcanic rock and are known for their rugged canyons and unique geology.

Boise Airport (BOI)

Boise Airport (BOI) is the closest airport to Boise, Idaho. Located just 4 miles southwest of downtown Boise, it is the busiest airport in the state and serves as a hub for Alaska Airlines, Delta Air Lines, Southwest Airlines, and United Airlines. BOI offers non-stop flights to 18 destinations across the United States, including major cities such as Denver, Los Angeles, Portland, Salt Lake City, and San Francisco. The airport has two runways, a modern terminal with 11 gates, and a variety of amenities, including restaurants, shops, and a business center.

Distance and Transportation

The distance between Boise Airport and downtown Boise is approximately 4 miles, which takes about 10 minutes to drive without traffic. There are several transportation options available for getting from the airport to the city, including taxis, ride-sharing services (Uber and Lyft), public buses, and airport shuttles. Boise Airport also offers long-term and short-term parking options for those who prefer to drive their own vehicles.

Culture and Arts

Boise is renowned for its vibrant arts scene. The city is home to several museums, including the Boise Art Museum, which features a diverse collection of modern and contemporary art. The Boise Philharmonic Orchestra and the Idaho Shakespeare Festival are among the leading performing arts organizations in the region. The city also boasts a thriving independent music scene, with numerous live music venues showcasing local and national acts.

Outdoors and Recreation

Boise is an outdoor enthusiast’s paradise. The city is situated along the Boise River, which offers scenic float trips and kayaking opportunities. The nearby foothills and mountains provide ample hiking and biking trails, with the renowned Bogus Basin Mountain Recreation Area just a short drive away. Boise also features numerous parks and green spaces, including the sprawling Julia Davis Park and the Idaho Botanical Garden. The city’s temperate climate allows for year-round outdoor recreation, from skiing and snowboarding in the winter to fishing, swimming, and camping in the warmer months.