San Bernardino Climate & Monthly Temperature Overview – United States

Hot and Dry Desert Climate

San Bernardino has a hot and dry desert climate characterized by scorching summers and mild winters. The summer temperatures soar to an average daily high of 97°F (36°C) in July and August, with scant rainfall. Summer nights cool down but remain warm with average low temperatures hovering around 68°F (20°C). The extreme heat can occasionally spike above 110°F (43°C) during heatwaves. The lack of precipitation and humidity contributes to the arid conditions, making the summers feel even hotter.

Mild and Pleasant Winters

Winter in San Bernardino is comparatively mild and pleasant, though temperatures can fluctuate. The average daily high in January, the coldest month, is a comfortable 59°F (15°C), while the low dips to 36°F (2°C) at night. Occasional cold fronts can bring chilly nights with temperatures below freezing. However, snow is a rare occurrence, and if it does fall, it usually melts quickly. The winter months receive more precipitation than summer, but rainfall remains sparse. The shoulder seasons of spring and fall offer moderate temperatures, making them ideal for outdoor activities.

Summer Temperatures

The average temperature in San Bernardino during the summer months (June to September) is consistently warm, with temperatures ranging from the mid-70s to the mid-90s Fahrenheit (24-35 Celsius). The hottest month of the year is typically August, with average high temperatures reaching 96°F (36°C). The summer months are characterized by low humidity and clear skies, providing ample sunlight and warm evenings.

Winter Temperatures

In contrast to the warm summers, San Bernardino’s winter months (December to February) are generally mild, with average temperatures ranging from the mid-40s to the mid-60s Fahrenheit (7-18 Celsius). The coldest month of the year is typically January, with average high temperatures reaching 58°F (14°C). Occasional storms may bring rainfall or snow, but the winters are typically short and dry.

Cloud Patterns and Types

San Bernardino, located in the Inland Empire of Southern California, experiences a diverse range of cloud patterns and types throughout the year. During the summer months, the skies are often clear, with few clouds present. However, during the winter months, the region experiences more frequent cloud cover. Common cloud types include cumulus, stratus, and cirrus clouds. Cumulus clouds are puffy and white, resembling cotton balls. Stratus clouds are flat and gray, often covering the entire sky. Cirrus clouds are thin and wispy, appearing as feather-like streaks.

Influence on Weather Conditions

The presence of clouds can have a significant impact on weather conditions in San Bernardino. Clouds can block sunlight, leading to cooler temperatures. They can also act as a blanket, trapping heat and causing temperatures to rise. Additionally, clouds can produce precipitation in the form of rain, snow, or hail. Cumulonimbus clouds, commonly known as thunderclouds, are associated with thunderstorms and can bring heavy rainfall, thunder, and lightning.

Annual Precipitation

San Bernardino, located in the Inland Empire of Southern California, experiences an arid to semi-arid climate with limited precipitation throughout the year. The city’s mean annual rainfall is approximately 14 inches (36 centimeters) and exhibits significant variability from year to year. The majority of precipitation occurs during the winter months, typically from December through March, with an average of 3 to 4 inches (7.6 to 10.2 centimeters) per month. Summer months are generally dry, with average rainfall of less than 0.5 inches (1.3 centimeters) per month.

Seasonal Variability

San Bernardino’s precipitation patterns are influenced by the region’s topography and proximity to the Pacific Ocean. During the winter months, storm systems from the Pacific Ocean often bring heavy rainfall to the San Bernardino Mountains, which lie to the northeast of the city. These storms can produce significant rain and occasional snowfall in San Bernardino, contributing to the bulk of its annual precipitation. In contrast, summer months are characterized by high temperatures and low humidity, with sporadic thunderstorms that provide little rainfall. The city’s Mediterranean climate results in warm, dry summers and mild, wet winters.

Rainfall Patterns

San Bernardino experiences a semi-arid climate, characterized by warm, dry summers and mild, wet winters. Rainfall is highly variable, with the wettest months being December through March. During this period, the city can receive up to 80% of its annual rainfall, which averages around 12 inches (300 mm). In spring and autumn, precipitation is sparse, and occasional thunderstorms may occur. Summers are usually dry, with little to no rainfall.

Seasonal Rainfall and Annual Variability

Rainfall patterns in San Bernardino are influenced by the Pacific Ocean and the local topography. The San Bernardino Mountains, located to the north, act as a barrier that forces moist air masses to rise and cool, resulting in increased rainfall on the windward side. As a result, the southern slopes of the mountains receive more precipitation than the lower-lying areas to the south. Additionally, El Niño events tend to bring wetter winters, while La Niña events generally result in drier conditions. The annual rainfall in San Bernardino can vary considerably, with some years receiving as much as 20 inches (510 mm) or as little as 7 inches (180 mm).

Snowfall Patterns and Impacts

San Bernardino, located in Southern California, typically experiences a Mediterranean climate characterized by dry summers and moderately wet winters. Snowfall is a relatively rare occurrence in the city. However, when it does snow, it can have a significant impact on the community. Snowfall is typically light, with an average annual accumulation of only a few inches. However, occasional heavy snowstorms can dump several feet of snow on the city, leading to widespread power outages, road closures, and disruptions to daily life.

Historical Snowfalls and Climate Change

While snowfall is not common in San Bernardino, there have been a few notable snowstorms throughout history. In 1949, the city was hit by a blizzard that dumped over 2 feet of snow, causing widespread damage and disruption. Other significant snowstorms occurred in 1989, 2005, and 2019. The frequency and intensity of snowfall in San Bernardino are influenced by climate change. Rising global temperatures are leading to a shift towards more extreme weather events, including heavy snowfall in areas that do not typically experience it. As the climate continues to change, it is possible that snowfall in San Bernardino will become more common and severe.

Historical Averages

San Bernardino, located in Southern California, experiences a warm and arid climate with consistent sunshine throughout the year. On average, the city receives around 300 sunny days annually, which equates to approximately 85% of the daylight hours possible. The sunniest months typically fall between June and September when the average daily sunshine duration exceeds 12 hours. During these months, the skies are often cloudless, and residents can bask in the warmth and brightness of the sun for extended periods.

Seasonal Variations

San Bernardino’s sunshine levels vary slightly throughout the year, reflecting the seasonal changes. During the winter months (December to February), the days are shorter, and cloud cover is more prevalent. As a result, the average sunshine duration decreases to around 9-10 hours per day. However, even during these months, there are still plenty of sunny days, and residents can expect to experience periods of sunshine despite the shorter daylight hours.

Visibility and Observation

San Bernardino, situated in Southern California, offers favorable conditions for moon observation. With its predominantly clear skies and low humidity, the city provides excellent opportunities to admire the intricacies of the lunar surface. During new moon phases, the sky darkens considerably, allowing for optimal viewing of the faintest stars and celestial objects. As the moon progresses through its phases, its position and illumination vary, creating a captivating spectacle in the night sky.

Phases and Phenomena

Throughout the month, the moon exhibits a range of phases visible from San Bernardino. Starting with the new moon, when the moon is not visible from Earth, it gradually waxes, becoming a crescent, a half moon (first quarter), and eventually a full moon. The full moon phase offers the most prominent lunar display, illuminating the night sky with its brilliant glow. As the month progresses, the moon wanes, passing through the gibbous, third quarter, and crescent phases before reaching the new moon phase again. Occasionally, moon-related phenomena such as lunar eclipses and supermoons can be observed from San Bernardino, offering astronomy enthusiasts and stargazers alike a captivating experience.

Impact of Temperature on Humidity

Temperature and humidity in San Bernardino, California, are closely related. Typically, during the summer months (June to September), temperatures soar into the 90s Fahrenheit (32-37 degrees Celsius), and humidity levels remain relatively low, ranging from 30% to 50%. This combination of high temperatures and low humidity contributes to the region’s dry and arid climate.

In contrast, during the winter months (November to February), temperatures drop significantly, often reaching into the 40s and 50s Fahrenheit (4-12 degrees Celsius). During this time, humidity levels tend to increase, reaching up to 60% or 70%, creating a more humid and moist atmosphere. The increase in humidity is associated with the prevalence of fog and morning dew during the winter months in San Bernardino.

General Wind Patterns

San Bernardino, located in Southern California, experiences a unique blend of wind patterns influenced by its geographical location. During the summer months, the predominant wind direction is from the west, bringing cool and refreshing ocean breezes to the region. These westerly winds are part of the prevailing westerlies that flow from the Pacific Ocean across the North American continent. In the winter, however, the wind patterns shift, and northeasterly winds become more prevalent, carrying colder air from the interior of the country.

Santa Ana Winds

San Bernardino is also known for its occasional episodes of Santa Ana winds. These strong, gusty winds originate from the high-pressure systems over the Great Basin and are channeled through the Cajon Pass, a narrow mountain pass to the north of the city. Santa Ana winds can reach speeds of up to 80 miles per hour and are characterized by their hot, dry, and often destructive nature. They are most common during the fall and winter months and can lead to wildfires, damage to property, and hazardous driving conditions. The combination of these wind patterns creates a diverse and dynamic wind environment in San Bernardino, shaping the local climate, ecological processes, and human activities.

Warm and Sunny Summers:

San Bernardino enjoys a Mediterranean climate, characterized by warm, dry summers and mild, wet winters. For those seeking outdoor adventures and ample sunshine, the ideal time to visit is between June and September. Temperatures during this period soar into the mid-80s Fahrenheit, providing perfect conditions for exploring San Bernardino’s parks, lakes, and hiking trails. Summer days are typically clear and sunny, with minimal rainfall, ensuring a pleasant and enjoyable stay. Whether it’s swimming in Lake Arrowhead, hiking through the San Bernardino Mountains, or attending the annual Orange Show, summer in San Bernardino offers an abundance of outdoor activities and cultural experiences.

Mild Winters with Occasional Rain:

During the winter months, from December to March, temperatures in San Bernardino drop into the 40s and 50s Fahrenheit. Rainfall becomes more common, with occasional showers and fog. This season provides a different charm for visitors, allowing for cozy strolls through the historic downtown area, exploring museums such as the San Bernardino County Museum or the California Citrus State Historic Park, and admiring the vibrant holiday decorations in the city center. While not as ideal for outdoor activities, winter in San Bernardino offers an opportunity to experience the city’s cultural side and savor the unique atmosphere of the season.

Solar Energy Potential

San Bernardino, California, possesses exceptional solar energy potential due to its favorable geographic location and abundance of sunshine. The city experiences an average of 300 sunny days per year and receives approximately 2,800 sunshine hours annually. This consistently high solar irradiation makes San Bernardino suitable for both residential and commercial solar energy systems. Moreover, the relatively low cost of solar panels and the availability of government incentives have further incentivized widespread adoption of solar energy in the region.

Economic and Environmental Benefits

Harnessing solar energy in San Bernardino offers significant economic and environmental benefits. Solar photovoltaic (PV) systems can significantly reduce electricity costs for homeowners and businesses, contributing to overall energy efficiency and financial savings. Additionally, the reduced reliance on fossil fuels for electricity generation leads to lower greenhouse gas emissions, promoting cleaner air and a sustainable environment. The city’s commitment to solar energy has also created new job opportunities in the renewable energy sector, fostering economic growth and innovation in the community. By embracing solar energy solutions, San Bernardino is actively mitigating climate change and positioning itself as a leader in clean energy initiatives.

Mountains and Hills:

San Bernardino is situated within the San Bernardino Mountains, which form a significant portion of the city’s topography. The mountains rise prominently to the north, with peaks such as Mount San Bernardino (10,635 feet) dominating the skyline. The mountains provide a stunning backdrop to the city, offering opportunities for hiking, mountain biking, and skiing. Along the southern edge of the city, the San Bernardino foothills, a series of rolling hills, gently slope down to the San Bernardino Valley. These hills provide a more accessible area for hiking and recreation while still offering scenic views.

Valleys and Plains:

San Bernardino is located within the San Bernardino Valley, a broad and relatively flat expanse that stretches from the base of the mountains to the south. The valley floor is characterized by alluvial deposits, which have created a fertile agricultural area. The valley floor slopes gently southward, eventually transitioning into the San Jacinto Valley. The extreme southern portion of the city lies within the San Gorgonio Pass, a significant mountain pass that connects the San Bernardino Valley to the Coachella Valley. The pass is flanked by the San Bernardino Mountains to the north and the San Jacinto Mountains to the south, creating a dramatic topographical feature.

San Bernardino International Airport (SBD)

San Bernardino International Airport (SBD) is the closest airport to San Bernardino, located approximately 3 miles (5 kilometers) south of the city center. This commercial airport offers both domestic and international flights, connecting San Bernardino to various destinations within the United States and beyond. With its convenient location and modern facilities, SBD is the preferred choice for travelers seeking easy access to and from San Bernardino.

Ontario International Airport (ONT)

Located approximately 19 miles (30 kilometers) west of San Bernardino, Ontario International Airport (ONT) is another convenient option for air travel. ONT offers a wider range of flight options compared to SBD, providing connections to major hubs and cities across the country and internationally. Its proximity to San Bernardino makes it a suitable choice for those seeking a broader selection of flight schedules and destinations.

History of San Bernardino

San Bernardino has a rich and diverse history, dating back to the arrival of the Spanish in the 18th century. The area was originally inhabited by the Serrano Native American tribe, who were known for their skilled basketry and pottery. In 1769, Franciscan missionaries established a mission in the San Bernardino Valley, which became a major center of agriculture and trade in the region. The city of San Bernardino was founded in 1851 by Mormon settlers who were looking for a suitable place to establish a permanent home. The city grew rapidly in the late 19th and early 20th centuries, thanks to the influx of miners and railroad workers. During this time, San Bernardino became a major transportation hub and a center of the citrus industry.

In the mid-20th century, San Bernardino experienced a period of decline as the citrus industry moved to other parts of the state. The city’s economy suffered, and many of its residents moved to other areas. In the late 20th century, San Bernardino began to experience a revival, thanks to the growth of the Inland Empire and the city’s proximity to Los Angeles. Today, San Bernardino is a vibrant and diverse city with a strong economy and a rich cultural heritage.

Culture of San Bernardino

San Bernardino is a city with a rich and diverse culture, reflecting its history as a crossroads for people from all over the world. The city is home to a variety of museums, theaters, and cultural organizations that celebrate its unique heritage. The San Bernardino County Museum is the largest museum in the Inland Empire and features exhibits on the history, culture, and natural resources of the region. The city is also home to the California Theatre of the Performing Arts, which hosts a variety of live performances, including Broadway shows, concerts, and dance performances.

San Bernardino is also known for its vibrant Latino culture. The city hosts a number of annual festivals and events that celebrate Latino heritage, including the Cinco de Mayo Festival and the Dia de los Muertos Festival. The city is also home to a number of Latino-owned businesses and restaurants, which offer a variety of authentic Mexican and Central American cuisine.