Pasco Climate & Monthly Temperature Overview – United States

Summer in Pasco

Pasco experiences hot and dry summers. The average temperature in July, the warmest month, is 90°F (32°C), with highs often reaching into the 100s (38°C). Nighttime temperatures typically drop to around 60°F (16°C). The summer months receive little to no rainfall, with an average of only 0.1 inches (2.5 mm) in July. The low humidity levels and warm temperatures make for ideal conditions for outdoor activities and swimming.

Winter in Pasco

Winters in Pasco are mild and dry. The average temperature in January, the coldest month, is 39°F (4°C), with highs around 50°F (10°C). Nighttime temperatures can drop to around 20°F (-7°C). Pasco receives an average of 1.5 inches (38 mm) of snow per year, with most of it falling in December and January. The combination of cold temperatures and low humidity makes for a dry cold that may feel colder than the temperature suggests.

Average Temperature in Pasco, United States: Monthly Distribution

Pasco, Washington is characterized by a continental climate with hot, dry summers and cold, wet winters. The average annual temperature is a moderate 53.5°F (11.9°C). The hottest month is July, with an average temperature of 75.4°F (24.1°C), while January is the coldest, with an average temperature of 34.6°F (1.4°C). The temperature variation throughout the year is significant, with the coldest month being about 41°F (23°C) colder than the hottest month.

Annual Temperature Variation

The annual temperature in Pasco exhibits a notable seasonal pattern. The temperature begins to rise in the spring, with April marking the start of a gradual increase. This warming trend continues until July, when the temperature reaches its peak. The temperature then starts to decline in August and continues to do so until December, when it reaches its lowest point. January and February are typically the coldest months, with average temperatures below freezing. The temperature gradually rises from March onwards, completing the seasonal cycle.

Cloud Coverage and Types:

Pasco, located in the state of Washington, USA, experiences varying cloud cover throughout the year. During the winter months (November-March), cloud cover is generally high, with frequent overcast conditions. The average cloud cover during this period is around 7/10 to 8/10, meaning that most of the sky is covered by clouds. The most common cloud types during winter are stratus, stratocumulus, and nimbostratus.

In contrast, summer months (June-August) in Pasco are characterized by significantly lower cloud cover. Clear skies or scattered clouds are more prevalent during this time, resulting in an average cloud cover of around 3/10 to 4/10. The most common cloud types observed in summer include cirrus, cirrocumulus, and cumulus.

Cloud Formation and Precipitation:

The formation of clouds in Pasco is influenced by several factors, including the presence of moisture in the air, prevailing wind patterns, and topography. Moist air rising from the Columbia River and surrounding areas can condense to form clouds. Prevailing westerly winds carry moisture from the Pacific Ocean into the region, contributing to cloud formation. Additionally, the Cascade Mountains and the Blue Mountains to the east can act as barriers, forcing air to rise and condense.

Precipitation in Pasco is generally low throughout the year. The average annual precipitation is around 10 inches, with most falling during the winter months in the form of rain or snow. During the summer, precipitation is mostly limited to occasional thunderstorms. The presence of clouds plays a role in precipitation by providing a surface for water vapor to condense and form rain or snow.

Average Precipitation

Pasco, located in the southeastern region of Washington State, experiences an arid climate, characterized by low precipitation levels throughout the year. The average annual precipitation in Pasco is a mere 6.41 inches (163 mm), making it one of the driest cities in the United States. Precipitation is primarily concentrated in the winter months, with December and January witnessing the highest average rainfall. Summers, on the other hand, are extremely dry, with July and August receiving virtually no precipitation.

Precipitation Patterns

The precipitation patterns in Pasco are influenced by its geographical location and the prevailing weather patterns in the region. The Columbia River Basin, which Pasco lies within, is influenced by the Pacific Ocean’s cool and humid air masses. These air masses interact with the Cascade Mountains, located to the west of Pasco, which force the moist air to rise and condense, releasing precipitation on the western slopes. As the air moves eastwards, it loses moisture, resulting in the extreme aridity experienced in Pasco and the surrounding areas. In addition, the rain shadow effect caused by the Cascade Mountains further reduces the amount of precipitation reaching Pasco.

Average Precipitation

Pasco, Washington, experiences an average annual precipitation of around 7 inches, making it one of the driest cities in the United States. This precipitation is distributed throughout the year, with the wettest months being November through March, when the average monthly precipitation exceeds 1 inch. During the summer months, however, precipitation is scarce, with July and August averaging less than a quarter of an inch each.

Seasonal Variation

Due to its location in the rain shadow of the Cascade Mountains, Pasco’s rainfall patterns exhibit notable seasonal variation. The winter months, influenced by the Pacific Ocean’s moisture-bearing winds, receive significantly more precipitation than the summer months. During these winter months, storms frequently pass over the area, bringing rain or snow. In contrast, during the summer months, when the prevailing winds shift to a more easterly direction, Pasco receives very little precipitation. As a result, the city experiences a dry continental climate with hot, dry summers and mild, wet winters.

Causes of Snowfall in Pasco, United States

Pasco, Washington, is located in the arid Columbia Basin region of the Pacific Northwest. Despite its generally mild climate, snowfall can occur during the winter months due to several factors. One primary factor is the influence of the Cascade Mountains, which act as a barrier to warm, moist air from the Pacific Ocean. When cold air from the north interacts with these mountains, it is forced to rise, causing moisture to condense and form clouds. As the clouds move eastward, they release precipitation in the form of snow over Pasco and the surrounding areas.

Additionally, Pasco’s location in the Columbia Basin makes it susceptible to cold air outbreaks from the Arctic. These outbreaks bring frigid temperatures and can lead to significant snowfall. When the cold air meets the relatively warm waters of the Columbia River, moisture evaporates and forms clouds that produce snow. Furthermore, Pasco is located in a region known as the “Snow Belt,” which is characterized by frequent snowfall during the winter. The combination of these factors creates favorable conditions for snowfall in Pasco, resulting in occasional snowstorms throughout the winter season.

Summer Sun

Pasco, located in the southeastern region of the U.S. state of Washington, experiences warm and sunny summers, characterized by long days and minimal precipitation. The average temperature during the summer months (June to August) ranges from a high of 81°F (27°C) to a low of 57°F (14°C). The area receives ample sunshine, with an average of 12 hours of solar radiation per day. During this period, the clear skies and lack of humidity create a pleasant and inviting outdoor atmosphere. However, it’s important to note that occasional strong winds and dust storms can occur during the summer months.

Winter Sun

In contrast to its sunny summers, Pasco’s winters are typically cool and overcast. The average temperature during the winter months (December to February) ranges from a high of 41°F (5°C) to a low of 26°F (-3°C). While sunshine is less frequent during this time, Pasco still receives an average of 4 to 6 hours of sunlight per day. The area may experience occasional rain or snow, but substantial snowfall is rare. However, freezing temperatures and fog can be common throughout the winter months. These conditions can make it challenging to engage in outdoor activities, but provide a cozy and picturesque ambiance during the colder seasons.

Lunar Visibility and Timing

The moon’s visibility and timing in Pasco, United States, follow predictable patterns based on its lunar phase and seasonal variations. During full moon phases, the entire lunar disk is illuminated, making it the most visible in the night sky. This typically occurs once a month, with the exact timing and date varying slightly each month. As the lunar phase progresses from full to new moon, the illuminated portion of the moon gradually decreases, resulting in crescent, quarter, and gibbous phases. New moon phases, where no portion of the moon is visible, occur approximately every 29.5 days. The timing of moonrise and moonset in Pasco also varies depending on the time of year and the moon’s phase. Generally, the moon rises and sets earlier in the evening during summer months and later in the morning during winter months.

Cultural and Astronomical Significance

The moon has significant cultural and astronomical importance in Pasco and beyond. Native American cultures historically used the moon’s phases to track time, guide hunting and fishing practices, and establish cultural traditions. In modern times, the moon continues to inspire awe and curiosity, and many astronomy enthusiasts in Pasco enjoy observing and studying it through telescopes. Amateur and professional astronomers alike use lunar observations to understand the moon’s physical characteristics, composition, and its relationship with Earth and the solar system. The moon also plays a crucial role in generating tides and influencing Earth’s rotation, making it an important subject of research and exploration.

Average Humidity Levels

Pasco, Washington experiences moderate humidity levels throughout the year. The average annual relative humidity is around 53%, with seasonal variations. During the cooler months (October to April), humidity levels tend to be higher, averaging between 55% and 65%. This is due to the increased frequency of precipitation, which brings moisture into the atmosphere. In contrast, the warmer months (May to September) are typically drier, with humidity levels ranging from 45% to 55%. These lower humidity levels are caused by the reduced precipitation and increased evaporation rates.

Extreme Humidity Conditions

While Pasco typically experiences moderate humidity, extreme humidity conditions can occur during certain times of the year. During the summer months, particularly during heat waves, humidity levels can rise significantly, exceeding 80% at times. This extreme humidity can cause discomfort and heat-related illnesses, especially for vulnerable populations such as the elderly and those with respiratory conditions. Conversely, during the winter months, humidity levels can drop below 30%, leading to dry skin, chapped lips, and respiratory irritation. It is important for residents to be aware of these potential extremes and take necessary precautions to mitigate their effects.

Historical Wind Data

Pasco, Washington, United States, has a long and detailed history of wind data collection. The National Weather Service has maintained a weather station in Pasco since 1891, providing a continuous record of wind speed and direction. This data shows that Pasco has a relatively windy climate, with an average wind speed of 11.5 mph. The windiest months are March and April, when the average wind speed exceeds 13 mph. The calmest months are July and August, when the average wind speed drops to around 10 mph.

Wind Patterns

The wind in Pasco is primarily driven by the large-scale circulation patterns of the Pacific Northwest. In the winter months, the prevailing wind direction is from the southwest, bringing warm and moist air from the Pacific Ocean. This wind is often associated with storms and precipitation. In the summer months, the prevailing wind direction shifts to the northwest, bringing cooler and drier air from the Gulf of Alaska. This wind is often associated with clear skies and sunshine. In addition to these large-scale patterns, Pasco also experiences local wind patterns, such as the “Pasco Gap.” This gap in the Cascade Mountains allows cold air to flow down from the mountains and create strong winds in the Pasco area.

Spring (March-May)

Spring in Pasco is characterized by mild temperatures, abundant sunshine, and blooming wildflowers. The average temperatures range from 45°F to 75°F, making it an ideal time for outdoor activities. The lack of crowds during this time allows visitors to enjoy the region’s natural beauty without encountering large groups. Whether it’s hiking through the scenic trails at Columbia Park or kayaking along the Columbia River, spring provides an opportunity to immerse oneself in the area’s natural splendor.

Fall (September-November)

Fall in Pasco offers a vibrant display of colors as the leaves of deciduous trees transform into a kaleidoscope of shades. Temperatures remain pleasant, ranging from 40°F to 65°F, creating a comfortable environment for exploration. The fall harvest season brings a bounty of fresh produce, which visitors can savor at local farmers’ markets or enjoy in the farm-to-table restaurants. This season also marks the start of the annual Pasco Pumpkin Patch Festival, where families can indulge in pumpkin-themed activities, hayrides, and live entertainment.

Solar Resources in Pasco

Pasco, located in central Washington State, enjoys abundant sunshine throughout the year, making it an ideal location for harnessing solar energy. The city experiences an average of 290 days of sunshine annually, with a peak in the summer months when daily solar radiation levels can reach 6 kWh/m2. This abundance of sunlight presents significant opportunities for solar photovoltaic (PV) systems, which convert solar energy into electricity.

Solar Potential and Development

Due to its favorable solar resources, Pasco has witnessed a steady growth in solar PV installations. The city has implemented various policies and incentives to promote solar energy adoption, including net metering programs and streamlined permitting processes. As a result, numerous residential, commercial, and industrial properties in Pasco have installed solar PV systems, contributing to a growing local solar industry. The city is actively exploring the potential for utility-scale solar farms, which could further expand Pasco’s solar energy capacity and contribute to local economic development.

Landscape Features

Pasco, Washington, lies within the Columbia Basin, a vast semi-arid region characterized by rolling hills, plateaus, and coulees. The most prominent topographic feature in the area is Rattlesnake Mountain, a basalt-topped mesa that rises over 1,600 feet (488 m) above the surrounding terrain. Other notable landscape features include the Horse Heaven Hills, a series of parallel ridges and valleys stretching from Yakima River to the Columbia River, and the Esquatzel Coulee, a deep, wide canyon formed by ancient glacial floods.

Columbia River Plateau

Pasco is part of the greater Columbia River Plateau, a massive volcanic province that encompasses much of eastern Washington, Oregon, and Idaho. This region was formed by repeated volcanic eruptions over millions of years, resulting in the accumulation of thick layers of basalt lava. The Columbia River later carved a deep canyon through the plateau, exposing the underlying volcanic rocks. The Pasco Basin, where Pasco is located, is a depression within the Columbia River Plateau that was formed by tectonic subsidence.

Tri-Cities Airport (PSC)

The nearest airport to Pasco is the Tri-Cities Airport (PSC), located approximately 3 miles west of the city center. PSC is a regional airport serving the Tri-Cities metropolitan area, which includes Pasco, Kennewick, and Richland. The airport offers a variety of domestic and seasonal international flights, connecting passengers to destinations throughout the United States and beyond. PSC is the major commercial airport for the region and serves as a hub for Alaska Airlines and Delta Air Lines. The airport features a single terminal with multiple gates and offers a range of amenities and services, including dining options, retail stores, and ground transportation connections.

Other Nearby Airports

In addition to the Tri-Cities Airport, there are several other airports within a reasonable driving distance of Pasco. These airports include:

Yakima Air Terminal (YKM): Located approximately 58 miles northwest of Pasco, YKM is a smaller regional airport serving the Yakima Valley. YKM offers limited commercial flights, primarily to destinations within the Pacific Northwest.
Spokane International Airport (GEG): Located approximately 120 miles north of Pasco, GEG is a major commercial airport serving the Spokane metropolitan area. GEG offers a wide range of domestic and international flights, connecting passengers to destinations throughout the United States and beyond.
Seattle-Tacoma International Airport (SEA): Located approximately 220 miles west of Pasco, SEA is the largest commercial airport in the Pacific Northwest. SEA offers a comprehensive network of domestic and international flights, connecting passengers to destinations around the world.

History of Pasco, Washington

Pasco, Washington, is a city located in the southeastern part of the state, along the banks of the Columbia River. The area has been inhabited by Native American tribes for thousands of years, and the city was officially founded in 1883 by Marcus Whitman, a Presbyterian missionary who established a mission in the area. Pasco’s early economy was based on agriculture, and the city grew rapidly after the arrival of the railroad in 1887. In the 20th century, Pasco became a major transportation hub and a center for food processing and distribution. Today, Pasco is a thriving city with a diverse population and a strong economy.

Culture and Attractions in Pasco

Pasco is home to a variety of cultural attractions, including the Pasco Art Museum, which features a collection of American and European art, and the Pasco Music Theater, which hosts a variety of live performances. The city also has a number of parks and recreation areas, including the Sacajawea Heritage Trail, which follows the path of the Lewis and Clark Expedition through the area. Pasco is also home to the Columbia Basin College, which offers a variety of educational programs and cultural events. Additionally, the city is a popular destination for outdoor recreation, with opportunities for fishing, boating, and hiking in the nearby Columbia River Gorge.