Santa Rosa Climate & Monthly Temperature Overview – United States

Summer in Santa Rosa

Santa Rosa experiences warm and sunny summers, with temperatures averaging in the mid-80s during the day and dropping to the low 60s at night. The hottest months are July and August, when temperatures can occasionally reach into the 100s. While summer rainfall is infrequent, it typically occurs in the form of brief afternoon thunderstorms. Given the warm, dry conditions, summer is an ideal time to explore the numerous hiking trails and outdoor attractions in the surrounding area.

Winter in Santa Rosa

In contrast to the warm summers, winters in Santa Rosa are mild and wet. Temperatures average in the low 50s during the day and dip down to around 40 degrees at night. The wettest months are December and January, when rainfall is common. While snowfall is rare, it does occur sporadically, typically in the form of light dustings. The winter months are characterized by frequent fog, which can linger throughout the day, especially in the early mornings. Despite the cooler temperatures and rain, Santa Rosa offers a variety of indoor attractions and cozy restaurants to enjoy during the winter season.

Seasonal Variations

Santa Rosa experiences significant seasonal variations in temperature. During the summer months (June, July, and August), the average high temperatures range from 86°F to 91°F (30°C to 33°C). However, the evenings can be surprisingly cool, with average lows dipping to around 50°F to 55°F (10°C to 13°C).

In contrast, winter temperatures in Santa Rosa are much milder. The average high temperatures during the winter months (December, January, and February) range from 55°F to 60°F (13°C to 16°C), while the average low temperatures hover around 35°F to 40°F (2°C to 4°C). The city experiences occasional frosts and occasional rainfall during the winter months.

Cloud Cover and Types

The cloud cover in Santa Rosa, United States, varies throughout the year. During the summer months, the sky is often clear or partly cloudy, with average cloud cover ranging from 20% to 30%. In contrast, the winter months experience more overcast conditions, with cloud cover averaging between 50% and 60%. The most common cloud types observed in Santa Rosa include high cirrus clouds, mid-level altocumulus clouds, and low stratus clouds. During the summer, convective clouds, such as cumulus and cumulonimbus, can also develop, particularly in the afternoon and evening.

Cloud Formation and Dynamics

The formation and dynamics of clouds in Santa Rosa are influenced by several factors. During the summer, the prevailing onshore flow brings moist air from the Pacific Ocean, which condenses to form clouds as it rises over the coastal mountains. In the winter, the frequent storms associated with the Pacific storm track bring rain and cloud cover to the region. Additionally, the local topography plays a role in cloud formation, with higher elevations experiencing more frequent and persistent cloud cover due to orographic lifting. The presence of the Sonoma Mountain range to the west also contributes to the formation of clouds, as the mountains force moist air to rise and condense.

Annual Precipitation

Santa Rosa experiences a Mediterranean climate, characterized by dry, hot summers and wet, mild winters. The average annual precipitation is approximately 32 inches (813 mm), which is predominantly concentrated during the winter months. Rainfall is heaviest from December to March, with January typically being the wettest month. During this period, the city can receive significant amounts of rain, including occasional heavy downpours. In contrast, the summer months (June to September) are typically dry, with little or no rainfall.

Seasonal Variations

The seasonal distribution of precipitation in Santa Rosa is highly variable. In the wettest months, the city can experience prolonged periods of rainfall, leading to flooding and other weather-related hazards. Conversely, during the dry season, the city can go for extended periods without significant precipitation. This variability in precipitation patterns can have a profound impact on the local ecosystem, vegetation, and water resources. The lack of summer rainfall, combined with the hot temperatures, creates a fire-prone environment, making wildfire a frequent threat in the region.

Seasonal Rainfall Patterns

Santa Rosa experiences distinct seasonal rainfall patterns, with a pronounced wet season from October to April and a dry season during the remaining months. During the wet season, moderate to heavy rainfall is frequent, with an average monthly precipitation of 6-8 inches. The wettest month is January, which typically receives around 9 inches of rain. The dry season, in contrast, is characterized by little to no rainfall, with monthly precipitation typically below 2 inches. July and August are the driest months, with average rainfall of less than 0.5 inches.

Annual Rainfall Variability

Annual rainfall in Santa Rosa exhibits considerable variability from year to year. The average annual rainfall is approximately 30 inches, but it can range from as low as 15 inches during severe droughts to over 40 inches in wet years. This variability is influenced by a combination of factors, including the prevailing weather patterns, the strength of the El Niño-Southern Oscillation (ENSO), and local topographic features that can affect precipitation. In recent years, Santa Rosa has experienced a trend towards increasing annual rainfall, with several consecutive years receiving above-average precipitation.

History of Snowfall in Santa Rosa, United States

Santa Rosa, California, is not known for its snowfall. In fact, measurable snowfall is a rare occurrence in the city. However, there have been a few notable snow events in Santa Rosa’s history. The most recent snowfall occurred in January 2021, when the city received approximately 1 inch of snow. This was the first measurable snowfall in Santa Rosa since 1972. Prior to that, the city had not seen snowfall since 1962.

Causes of Snowfall in Santa Rosa, United States

Snowfall in Santa Rosa is caused by a combination of factors, including cold temperatures, moisture, and the presence of a cold front. Cold temperatures are necessary for snow to form, as the water vapor in the air must condense into ice crystals. Moisture is also necessary, as the ice crystals must have something to attach to in order to form snowflakes. Finally, a cold front can help to create the conditions necessary for snowfall by bringing in cold air and moisture.

Climate and Weather Trends

Santa Rosa experiences a Mediterranean climate, characterized by warm, dry summers and cool, wet winters. The city’s proximity to the Pacific Ocean provides a moderating effect on temperatures, keeping them relatively mild throughout the year. In the summer months (June to August), average temperatures range from 60-80°F (16-27°C), with occasional heat waves pushing temperatures into the 90s. Winters (December to February) are generally mild, with temperatures typically ranging from 35-55°F (2-13°C). However, cold spells and occasional frost can occur during the winter months.

Seasonal Variations

The period from March to May is considered springtime in Santa Rosa, with temperatures gradually warming and rainfall becoming more sporadic. The summer season, from June to August, is typically dry and sunny, with little precipitation and clear skies. Fall, from September to November, brings cooler temperatures and increasing rainfall. The winter months, from December to February, are the wettest time of year, with frequent rains and occasional storms. Snowfall is rare in Santa Rosa, but it has been known to occur on occasion.

Moonrise and Moonset Times in Santa Rosa

The moonrise and moonset times in Santa Rosa vary throughout the month and year. To determine the exact times for a specific date, refer to an online moon calendar or consult an almanac. Generally, the moon rises and sets earlier during the first half of the month and later during the second half. During a new moon, the moon is not visible from Earth, while during a full moon, the moon is visible all night long.

Moon Phases in Santa Rosa

Santa Rosa experiences all phases of the moon, including new moon, waxing crescent, first quarter, waxing gibbous, full moon, waning gibbous, third quarter, and waning crescent. The moon’s phase changes gradually over the course of a month, as the illuminated portion of the moon that is visible from Earth changes. During a new moon, the entire moon is dark, while during a full moon, the entire moon is illuminated. The other phases show varying degrees of illumination, with the waxing phases indicating an increasing amount of illumination and the waning phases indicating a decreasing amount of illumination.

Seasonal Humidity Variations

Santa Rosa, located in Northern California, experiences a Mediterranean climate with warm, dry summers and cool, wet winters. The humidity levels in the city vary significantly throughout the year, reaching their peak during the winter months. From December to March, the average relative humidity hovers around 70-80%, providing a damp and muggy environment. This is due to the increased precipitation during this period, as well as the cold temperatures that prevent moisture from evaporating into the atmosphere.

Summer Aridity

In contrast, the summer months in Santa Rosa are characterized by extremely low humidity levels. From June to September, the relative humidity typically drops below 50%, creating a dry and arid climate. The lack of rainfall and the intense heat during this time cause the moisture in the air to evaporate rapidly, resulting in a dry and comfortable atmosphere. This dryness can sometimes lead to respiratory issues and wildfires, as the vegetation becomes highly flammable due to the low moisture content.

Average Wind Speed

Santa Rosa, California experiences moderate average wind speeds throughout the year. During the summer months (June to September), the average wind speed ranges from 9 to 11 mph, with consistent westerly winds prevailing. In the fall and winter months (October to May), the average wind speed increases to 12-14 mph, with a more variable wind direction influenced by passing weather systems.

Wind Gusts

In addition to average wind speeds, Santa Rosa can also experience occasional strong wind gusts. During the spring and fall, wind gusts can exceed 30 mph, particularly during the passage of cold fronts or thunderstorms. The strongest wind gusts typically occur in the late afternoon or evening hours. During the summer months, wind gusts can be associated with sea breezes or thunderstorms, while in the winter months, stronger gusts can accompany storms and high-pressure systems.

Spring and Fall:

The optimal time to visit Santa Rosa is during the shoulder seasons of spring (March-May) and fall (September-November). During these months, the weather is generally pleasant, with warm days and cool nights. The crowds are smaller, allowing for more intimate experiences at popular attractions like the Luther Burbank Home & Gardens and the Charles M. Schulz Museum. Additionally, the blooming wildflowers in spring and the vibrant fall foliage create a picturesque backdrop for outdoor activities.

Summer:

Summer (June-August) in Santa Rosa offers long, sunny days ideal for exploring the region’s wineries and enjoying outdoor activities. Temperatures can reach into the 90s, making it essential to stay hydrated and seek shade during the hottest part of the day. Wine tours and tastings are a popular summer activity, as local wineries showcase their latest vintages. However, it’s worth noting that summer is also the busiest time of year, so expect larger crowds and higher prices for accommodations.

Potential of Solar Energy in Santa Rosa

Santa Rosa possesses exceptional solar potential due to its abundant sunshine and favorable climate. The city receives an average of 260 sunny days annually, with an average solar insolation of 4.5 kWh/m²/day. This makes solar energy a viable and renewable option for meeting the city’s electricity needs. Additionally, Santa Rosa’s commitment to sustainability and environmental protection further supports the adoption of solar energy.

Current Status and Future Prospects

In recent years, there has been significant growth in solar energy installations in Santa Rosa. As of 2022, over 100 megawatts of solar photovoltaic (PV) systems have been installed, with dozens more under development. The city’s Energy Action Plan aims to achieve 100% renewable electricity by 2030, with solar energy playing a major role in this transition. To facilitate this growth, Santa Rosa offers various incentives, such as rebates and tax breaks, for residents and businesses installing solar PV systems. With continued support and investment, solar energy is poised to become a cornerstone of Santa Rosa’s sustainable future.

Topography and Landscapes

Santa Rosa, nestled within Sonoma County, California, boasts a diverse array of topographic features. The city is surrounded by rolling hills and valleys, dotted with vineyards, orchards, and dense redwood forests. The iconic Sonoma Mountains form a rugged backdrop to the west, rising over 2,000 feet above sea level. The region’s distinct topography has been shaped by millions of years of geological processes, including tectonic uplift, erosion, and volcanic activity. The Santa Rosa Plain, stretching northward from the city center, is a gently sloping alluvial plain formed by the deposition of sediment from the Russian River.

Waterways and Wetlands

Santa Rosa is traversed by several significant waterways, including the Russian River and Santa Rosa Creek. These rivers have carved out deep canyons and meandering bends within the surrounding hills. The city also boasts numerous wetlands and riparian areas, which provide valuable habitat for wildlife and contribute to the region’s ecological diversity. The Laguna de Santa Rosa, located to the southeast of the city, is a seasonal wetland that supports a wide range of plant and animal species. Santa Rosa Creek’s floodplain includes several tributaries and marshes, creating a rich tapestry of aquatic and terrestrial ecosystems within the urban environment.

Charles M. Schulz – Sonoma County Airport (STS)

Charles M. Schulz – Sonoma County Airport (STS) is the closest airport to Santa Rosa, California, located just 10 miles northwest of the city center. It is a public airport owned by the County of Sonoma and was previously known as Sonoma County Airport-Santa Rosa before being renamed in 2003 in honor of the late “Peanuts” cartoonist Charles M. Schulz. STS serves the North Bay region of the San Francisco Bay Area.

STS offers commercial flights to various destinations within the United States, including Los Angeles (LAX), San Diego (SAN), Portland (PDX), and Phoenix (PHX). The airport is served by major airlines such as United Airlines, American Airlines, and Southwest Airlines. With its convenient location and easy access to Santa Rosa and the surrounding areas, STS is a popular choice for travelers in the North Bay region. The airport also features amenities such as restaurants, shops, and car rental services.

Entertainment and Nightlife in Santa Rosa, United States

Santa Rosa is home to a vibrant and eclectic entertainment and nightlife scene. The downtown area is a lively hub of activity, featuring a wide array of bars, restaurants, and live music venues. Visitors can enjoy craft beers at local breweries, sip cocktails at chic cocktail bars, and dance the night away at nightclubs. For those seeking cultural entertainment, the city offers a variety of theaters, museums, and art galleries.

Outdoor Recreation and Natural Beauty in Santa Rosa, United States

Nestled amidst the picturesque rolling hills of Sonoma County, Santa Rosa is a paradise for outdoor enthusiasts. The city boasts an extensive network of hiking and biking trails, providing breathtaking views of the surrounding countryside. Visitors can explore the redwood forests of Annadel State Park, hike to the summit of Mount Taylor for panoramic vistas, or bike along the scenic Joe Rodota Trail. The nearby Russian River also offers opportunities for kayaking, fishing, and swimming.