Nestled in California, Antioch offers a moderate climate that varies through the year.
The hot season extends from early June to early October, with daily high temperatures averaging above 83°F.
July stands out as the hottest month, with an average high of 90°F and low of 59°F.
In contrast, the cooler months from late November to mid-February showcase daily high temperatures falling below 62°F.
Rainfall in Antioch is sparse, with an average of 15 inches per year, making it much drier compared to the US average of 38 inches.
Throughout the year, you can expect roughly 62 rainy days, accumulating up to 10.16 inches of precipitation.
Snow is a rare event here, contributing to a comfortable, mild climate year-round.
Local weather conditions are influenced by Antioch’s location within the United States, characterized by significant daylight hours.
Daylight saving time shifts further enhance the experience by extending evening daylight, making Antioch’s weather enjoyable year-round for residents and visitors alike.
For a detailed overview of monthly temperatures, check out this climate graph of Antioch.
Average Temperature in Antioch, California
Antioch, California experiences a range of temperatures throughout the year.
January is one of the colder months, with an average high temperature of 57°F and an average low of 42°F.
July is the hottest month, where temperatures often peak with daily highs around 90°F and lows of 59°F.
From June to October, average daily highs stay above 83°F.
During this time, the temperatures are warm, making these months the warmest months of the year.
November brings cooler temperatures, with average highs around 62°F and lows around 45°F.
The coolest months are from late November to mid-February. During this period, daily high temperatures are below 62°F.
Here’s a brief overview of average monthly temperatures in Antioch:
| Month | Average High (°F) | Average Low (°F) |
|---|---|---|
| January | 57 | 42 |
| February | 61 | 44 |
| March | 65 | 47 |
| April | 70 | 50 |
| May | 77 | 55 |
| June | 85 | 59 |
| July | 90 | 59 |
| August | 89 | 59 |
| September | 85 | 57 |
| October | 75 | 51 |
| November | 62 | 45 |
| December | 57 | 41 |
The temperatures vary greatly from the average high of 90°F in July to average lows of 41°F in December.
Average Precipitation in Antioch, California
Antioch, California experiences varying precipitation levels throughout the year, with distinct wet and dry periods. Rainfall is the primary form of precipitation in this area, and snow is virtually non-existent.
Average Rainfall in Antioch, California
Antioch receives an average annual rainfall of 301 mm (approximately 11.85 inches).
The wettest month is December, with around 61 mm (2.4 inches) of precipitation.
In contrast, the driest month is July, when rainfall is nearly negligible.
Rainy days per month:
- December: 10 rainy days
- January: 9 rainy days
- February: 8 rainy days
- July: 0 rainy days
In total, Antioch sees about 62 rainy days per year, with most rain occurring between November and March.
Average Snow in Antioch, California
Snowfall in Antioch, California is extremely rare. Due to its climate and elevation, the city does not usually see snow.
The temperatures seldom drop low enough to support snow, making it an uncommon occurrence here.
The lack of snowfall can be attributed to the city’s Mediterranean climate, which favors mild, wet winters and hot, dry summers.
For snow and ice conditions and updated articles, you can explore more here.
Average Sun in Antioch, California
Antioch experiences abundant sunshine throughout the year, making it an ideal location for outdoor activities.
The city enjoys long daylight hours, especially during the summer months.
Average Daily Shortwave Solar Energy in Antioch, California
Antioch receives a significant amount of shortwave solar energy daily.
This energy is most intense during the summer, with clear skies allowing maximum sunshine.
The city averages around 9 hours of sunshine per day during peak months.
Winter months, however, see a reduction in sunshine hours, typically averaging around 5 hours of sunshine per day.
This drop is due to shorter days and increased cloud cover.
Sunrise and Sunset:
In June, the sun typically rises around 5:45 AM and sets close to 8:30 PM.
December days are much shorter, with sunrise around 7:15 AM and sunset by 4:50 PM.
This variation in daylight impacts the total daily sunshine hours.
Average Humidity in Antioch, California
Antioch, California experiences varying levels of humidity throughout the year.
January is typically the most humid month, with average relative humidity reaching around 80%.
October, on the other hand, is the least humid month, with average relative humidity dropping to around 71%.
The average annual percentage of humidity in Antioch is approximately 75%.
Monthly Average Humidity
Here is a breakdown of the average monthly relative humidity:
| Month | Average Relative Humidity |
|---|---|
| January | 80% |
| February | 79% |
| March | 78% |
| April | 77% |
| May | 75% |
| June | 73% |
| July | 72% |
| August | 72% |
| September | 71% |
| October | 71% |
| November | 74% |
| December | 77% |
Relative humidity measures the amount of moisture in the air compared to what the air can hold at that temperature.
The dew point in Antioch is relatively stable, reflecting the moderate temperatures and balanced humidity levels.
Overview of Humidity
- Highest Humidity: January at 80%
- Lowest Humidity: October at 71%
- Annual Average Humidity: 75%
These conditions can affect various activities and comfort levels for residents and visitors.
For more detailed climate information in Antioch, you can refer to World Weather & Climate Information.
Average Wind in Antioch, California
In Antioch, California, wind patterns vary throughout the year. Wind is an important factor for the climate, influencing weather conditions and temperature.
The average wind speed in Antioch is typically around 12 mph.
Spring:
During spring months, the wind is usually mild. Wind speeds range from 10-15 mph.
Summer:
In summer, the wind picks up, making it the windiest month of the year.
Wind speeds often reach up to 20 mph in some areas, providing a cooling effect during hot days.
Fall:
Fall sees a slight decrease in wind speed, generally between 8-12 mph.
Winter:
In winter, wind speeds average around 10 mph.
| Season | Average Wind Speed |
|---|---|
| Spring | 10-15 mph |
| Summer | up to 20 mph |
| Fall | 8-12 mph |
| Winter | 10 mph |
Wind patterns can affect daily life, especially outdoor activities. Accurate forecasting enhances safety and planning.
Average Air Quality in Antioch, California
The air quality in Antioch, California varies throughout the year. The Air Quality Index (AQI) is a key measure used to assess this. On average, Antioch sees a range of AQI levels, often categorized as “Good.”
Key Measurements:
- Average AQI: Antioch often has an AQI below 50, which is considered good.
- PM2.5 Levels: These fine particles average around 6 µg/m³.
- PM10 Levels: Coarse particles average around 18 µg/m³.
Seasonal Variations:
In the summer, air quality can worsen due to higher temperatures and dry conditions. During these months, there may be an increase in particulate matter.
Real-Time Data:
As of recent measurements, the AQI stands at 19, which falls in the “Good” category. Temperature readings during this time are around 66°F.
Air Quality Forecast:
Antioch is projected to see an increase in poor air quality days in the next 30 years. This anticipation is based on ongoing trends of pollution and climate change.
Additional Factors:
- Pressure: Atmospheric pressure in Antioch averages around 1013 millibars.
- Visibility: Clear days are common, but visibility can drop during high pollution periods.
Topography of Antioch, California
Antioch is located in Contra Costa County in Northern California. Its coordinates are roughly 38.0049° N latitude and 121.8058° W longitude.
Antioch’s elevation ranges from near sea level along the river to about 220 feet in the hills to the south. This variation provides diverse landscapes within a small area.
The western side of Antioch features flat, low-lying areas near the San Joaquin River. The river plays a key role in the region’s topography, cutting through the city.
Moving inland, the land rises gradually. The hilly areas provide a contrast to the flat riverbanks.
These hills are part of the foothills leading to the Diablo Range.
The table below summarizes key geographical features:
| Feature | Detail |
|---|---|
| Latitude | 38.0049° N |
| Longitude | 121.8058° W |
| Elevation | 0 – 220 feet |
| Landforms | Riverbanks, hills |
Antioch’s topography influences its climate, creating microclimates within the region.
Areas near the river tend to be cooler, while elevated regions can be slightly warmer.
The topography impacts local vegetation as well. The flat areas host lush greenery, while the hills are often dotted with dry, scrubby plants. These variations add to Antioch’s natural beauty.
Antioch also benefits from the nearby Mount Diablo, which rises to 3,849 feet.
This mountain is visible from many parts of the city and contributes to the area’s topographical diversity.
Extreme Weather Events that Occur in Antioch, California
Antioch, California, experiences a range of extreme weather events. These events include record high and low temperatures, as well as unusual rainfall patterns.
Record High Temperatures
Antioch is known for its hot summers. The all-time recorded high temperature in the city was 115°F.
Such high temperatures can lead to heatwaves, which can be dangerous for residents.
Record Low Temperatures
The city also sees cold winters. The lowest known temperature in Antioch’s history was 17°F.
These cold snaps can sometimes lead to frost and icy conditions.
Average Rainfall
Antioch’s weather patterns include periods of heavy rainfall. The average yearly rainfall is around 15 inches.
However, there have been years with significantly more or less rain, affecting local agriculture and water supply.
Droughts
Droughts are another critical weather event in Antioch. Extended periods of low rainfall can lead to water shortages, affecting both residents and farmers.
Wildfires
During dry seasons, the risk of wildfires increases. Hot, windy conditions can cause fires to spread quickly.
These events pose a serious threat to both people and property.
Summary of Extreme Weather Events
- Record High Temperature: 115°F
- Record Low Temperature: 17°F
- Average Yearly Rainfall: 15 inches
- Common Extreme Events: Heatwaves, droughts, wildfires
For more detailed information on temperature records, visit Extreme Weather Watch. To learn about monthly averages, see US Climate Data.
Best Time of the Year to Visit Antioch, California
Antioch, California offers diverse experiences throughout the year. Hot, dry summers and mild winters define this location. Let’s explore what each season brings to help visitors decide the best time to plan their trip.
What is Antioch, California Like in Spring
Spring in Antioch, California, spans from March to May.
During these months, temperatures range from the mid-50s to the high 70s, making it an excellent time for outdoor activities.
The city experiences moderate rainfall, which helps in blooming local flora and maintaining green landscapes.
Spring is ideal for hiking, picnicking, and visiting parks. Wildflowers are often in bloom, presenting vibrant colors.
The weather is perfect for sightseeing, with clear skies and pleasant temperatures.
It’s a comfortable season, neither too hot nor too cold, enhancing the enjoyment of outdoor events and festivals that begin around this time.
What is Antioch, California Like in Summer
Summer in Antioch, lasting from June to September, is characterized by hot and dry conditions.
Daily high temperatures can exceed 90°F, particularly in July and August. Nighttime offers relief with lows around 59°F.
This season is perfect for water-based activities like boating and swimming in local reservoirs.
However, due to the high temperatures, it’s essential to stay hydrated and protect against sun exposure.
Outdoor activities are best enjoyed in the early morning or late afternoon.
Despite the heat, summer is a popular time for visiting due to the reliable dry weather and long daylight hours.
What is Antioch, California Like in Fall
Fall in Antioch, from October to November, brings cooler and more comfortable weather.
Highs range from the 70s to the low 80s, and lows drop to the mid-50s. October is particularly pleasant, with temperatures often falling between 68°F and 78°F.
This season marks the end of the dry spell, and rain begins to return, but it is still relatively dry.
Fall colors are subtle but present in parks and vineyards, making it a time of scenic beauty.
It’s also an excellent season for wine tasting tours in nearby regions, as well as enjoying outdoor festivals that are common in the area.
What is Antioch, California Like in Winter
Winter in Antioch, from December to February, is mild compared to other parts of the country.
Daytime highs average around 58°F to 62°F, while nighttime lows can drop to around 40°F.
Expect occasional rain, contributing to the total annual 10.16 inches of precipitation.
While snow is rare, the region may experience foggy mornings, especially in January.
Winter activities can include visiting indoor attractions, enjoying local cuisine, and exploring less crowded outdoor areas.
Despite being the coolest season, winter in Antioch remains relatively mild and enjoyable for various activities.