LA weather in December opens a world of excitement and possibility, a time when the City of Angels transforms into a winter wonderland. The cool breeze brings a refreshing change from the scorching summer heat, making it the perfect season to enjoy the city’s outdoor attractions.
December in LA is characterized by mild temperatures, ranging from an average high of 63°F (17°C) to an average low of 48°F (9°C). The sunshine hours are at their peak, with an average of 9 hours of direct sunlight per day, making it ideal for outdoor activities like hiking, biking, and sightseeing.
Understanding December Weather Patterns in Los Angeles
Los Angeles in December – it’s the perfect time to cozy up by the fireplace or grab a coffee on your way to work without the scorching heat. As we transition into winter, the climate takes on a whole new dynamic. Let’s dive into what to expect from this chilliest winter month.
As we enter December, Los Angeles starts to experience the first whispers of winter. The Santa Ana winds begin to pick up, bringing with them a rush of cold air from the north. This shift in temperature is a stark contrast to the warm autumn months that preceded it. The average high temperature in December is a mild 64°F (18°C), while the average low temperature is a crisp 47°F (8°C). This temperature fluctuation might seem small, but it’s enough to make a noticeable difference in our daily lives.
Temperature Fluctuations
The temperature in Los Angeles can be quite unpredictable during December. It’s not uncommon to experience temperature swings of up to 20°F (11°C) within a single day. This is due in part to the influence of the Santa Ana winds, which can bring rapid changes in temperature and humidity. On average, the temperature can drop by as much as 10°F (5.6°C) in the span of just a few hours. It’s essential to pack layers when heading outdoors, as the temperature can drop rapidly.
- The average high temperature in December is 64°F (18°C), while the average low temperature is 47°F (8°C)
- Temperature swings of up to 20°F (11°C) can occur within a single day
- Average temperature drop of up to 10°F (5.6°C) in the span of just a few hours
Sunshine Hours
December is one of the sunniest months in Los Angeles, with an average of 9 hours of direct sunshine per day. This makes it an ideal time to take a break from the cold and enjoy the outdoors. However, be prepared for some overcast days, as the Santa Ana winds can bring a layer of cloud cover. It’s also worth noting that the shortest day of the year is December 21st, with the sun setting around 4:30 PM.
Potential Rainfall
December is typically one of the wettest months in Los Angeles, with an average of 3.3 inches (84 mm) of rainfall throughout the month. While this might not seem like a lot, it’s enough to make a noticeable impact on the weather. The rain is often heavy and can cause localized flooding, so it’s essential to be prepared for potential weather disruptions.
- Average of 9 hours of direct sunshine per day
- Shortest day of the year is December 21st, with the sun setting around 4:30 PM
- Average rainfall of 3.3 inches (84 mm) throughout the month
The Significance of the Santa Ana Winds
The Santa Ana winds are a crucial factor in shaping the December weather in Los Angeles. These winds bring a rush of cold air from the north, causing the temperature to drop rapidly. They can also lead to increased humidity and precipitation, making December one of the wettest months of the year. The Santa Ana winds are often accompanied by strong gusts, which can make them a significant factor in weather-related power outages and disruptions.
Precipitation and Potential Weather Events in December
Los Angeles in December, a time of year where precipitation takes center stage, bringing forth some exciting, yet unpredictable, weather patterns.
In a region known for its generally mild and sunny climate, December brings a mix of precipitation types that can sometimes be intense. From gentle drizzles to more severe downpours, rain is the most common form of precipitation in Los Angeles during this time. However, it’s essential to note that hail and fog can also make appearances on rare occasions.
Types of Precipitation
Los Angeles experiences various types of precipitation during December, which can impact the region in different ways.
Rain is the most common form of precipitation in Los Angeles, with December seeing an average total rainfall of 2.5 inches (63.5 mm). This amount may seem insignificant, but the region receives an average of 5-7 rainy days in December. The risk of flash flooding is relatively low due to the dry soil conditions and the region’s drainage system. However, excessive rainfall can still cause localized flooding, especially in areas with poor drainage.
Potential Weather-Related Events
Los Angeles in December is not without its share of severe weather events, including:
- Thunderstorms: Los Angeles experiences an average of 2-3 thunderstorms in December, with an impact level of moderate to high. These storms can bring heavy rain, strong winds, and, in some cases, hail.
- Strong Winds: Gusty winds can occur during thunderstorms or as a separate weather event, with an average frequency of 3-4 days in December. These winds can lead to power outages and damage to vegetation.
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Freezing Temperatures:
While rare, Los Angeles can experience freezing temperatures, typically in the mountains and desert areas, with an average frequency of less than 1 day in December. This can cause issues with road maintenance and agriculture.
- Flash Flooding: While unlikely, flash flooding can occur in areas with poor drainage, with an average frequency of less than 1 day in December. This can be catastrophic, especially in urban areas.
These weather events can impact daily life, transportation, and outdoor activities, making it essential to stay informed about the weather forecast.
Sunshine and Humidity Levels: La Weather In December
Los Angeles in December – while chilly, it still has an average of 10 hours of sunshine every day, with some fluctuations due to atmospheric pressure and temperature changes. The sunshine hours gradually decrease throughout the month, from 10.5 hours in early December to 9.5 hours by the end.
Sunshine Hours in Los Angeles (December)
– Early December: 10.5 hours
– Mid-December: 10 hours
– Late December: 9.5 hours
Humidity Levels in Los Angeles
The average relative humidity in Los Angeles during December is around 59%, with a slight fluctuation throughout the month due to atmospheric pressure changes. The highest humidity levels are observed during the early parts of the month, gradually decreasing as the month progresses.
Relative Humidity in Los Angeles (December)
– Early December: 62% (at 8 AM) / 55% (at 5 PM)
– Mid-December: 59% (at 8 AM) / 52% (at 5 PM)
– Late December: 56% (at 8 AM) / 49% (at 5 PM)
Comparison of Humidity Levels across different months
The average relative humidity levels throughout the year vary significantly. While December has an average humidity level of 59%, June has an average humidity level of 71%. This results in a much more humid environment during the summer months. Here’s a table comparing humidity levels across different months.
| Month | Average Humidity | Comparison |
|————|——————|———————|
| December | 59% | Low to Moderate |
| June | 71% | High to Moderate |
| May | 66% | Moderately Humid |
| October | 54% | Low to Moderate |
Regional Weather Variations
Los Angeles is a vast and diverse city, stretching across various landscapes and microclimates that all experience unique weather patterns. This geographical variability is due to a combination of factors, including elevation, coastal proximity, and urbanization. In order to understand the regional weather variations across Los Angeles, it’s essential to explore the differences between coastal and inland areas.
Coastal vs. Inland Weather Patterns
The coastal regions of Los Angeles tend to experience a more moderate climate, with temperatures that are cooler than inland areas. This is due to the moderating influence of the Pacific Ocean, which helps to regulate temperature fluctuations. In contrast, inland areas are more susceptible to temperature extremes, with hotter temperatures during the summer and colder temperatures during the winter.
Urban Heat Islands, La weather in december
Los Angeles has experienced significant urbanization over the years, leading to the development of urban heat islands. These areas tend to be warmer than surrounding rural areas due to the concentration of heat-absorbing surfaces such as pavement, buildings, and vehicles. This can lead to temperature readings that are higher than what would be expected based on the surrounding environment. Urban heat islands can also exacerbate the effects of heat-related illnesses, particularly for vulnerable populations such as the elderly and young children.
Microclimates within Los Angeles
Los Angeles is composed of various microclimates, each with its unique characteristics. Two distinct examples include:
- Santa Monica Bay: This coastal microclimate is characterized by a mild oceanic climate, with temperatures that are generally cooler than inland areas. The proximity to the ocean also leads to higher humidity levels, resulting in a milder climate overall. The Santa Monica Bay area is also known for its foggy mornings during the summer months, which can add to the area’s unique microclimate.
- Downtown Los Angeles: This central business district experiences a distinct urban climate, with temperatures that are often hotter than surrounding areas. The concentration of heat-absorbing surfaces, combined with the urban canyon effect, leads to higher temperature readings during the summer months. Downtown LA also experiences a unique type of fog known as “smog fog,” which is caused by the mixing of polluted air and moisture from the ocean.
The temperature difference between coastal and inland areas of Los Angeles can be as much as 10-15°F (5-8°C), making it essential to consider the specific microclimate when evaluating weather patterns.
Comparing Temperature and Precipitation Patterns
When comparing temperature and precipitation patterns across different microclimates within Los Angeles, it’s essential to consider the unique characteristics of each area. For example:
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Temperature: The Santa Monica Bay area tends to be cooler than downtown LA, with average temperatures ranging from 45-55°F (7-13°C) during the winter months. In contrast, downtown LA experiences warmer temperatures, ranging from 55-65°F (13-18°C).
- Precipitation: The Santa Monica Bay area receives more rainfall than downtown LA, with an average annual rainfall of around 15 inches (38 cm). In contrast, downtown LA receives around 10 inches (25 cm) of rainfall per year.
The unique microclimates within Los Angeles make it essential to consider the specific region when evaluating weather patterns and precipitation.
Final Conclusion
In conclusion, LA weather in December is a refreshing and pleasant experience, perfect for those looking for a change of pace from the scorching summer heat. With its mild temperatures and plenty of sunshine, it’s an ideal time to explore the city’s outdoor attractions and make the most of the holiday season.
Query Resolution
Q: Is it sunny in LA in December?
A: Yes, LA has an average of 9 hours of direct sunlight per day in December, making it an ideal time for outdoor activities.
Q: How cold does it get in LA in December?
A: The average low temperature in LA in December is around 48°F (9°C), while the average high temperature is around 63°F (17°C).
Q: Does it rain in LA in December?
A: LA receives an average of 2.7 inches (6.9 cm) of rainfall in December, which can lead to occasional rain showers.
Q: What are the best outdoor activities to do in LA in December?
A: Some of the best outdoor activities to do in LA in December include hiking, biking, and sightseeing, as the mild temperatures and plenty of sunshine make it ideal for exploring the city’s attractions.
