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Average Weather in Atascadero California, United States

In Atascadero, the summers are warm, arid, and clear and the winters are cold, wet, and partly cloudy. Over the course of the year, the temperature typically varies from 37°F to 83°F and is rarely below 29°F or above 91°F.

The warm season lasts for 3.8 months, from June 11 to October 4, with an average daily high temperature above 78°F. The hottest day of the year is August 23, with an average high of 83°F and low of 53°F.

The cool season lasts for 3.5 months, from November 23 to March 8, with an average daily high temperature below 64°F. The coldest day of the year is December 27, with an average low of 37°F and high of 59°F.

Average High and Low Temperature

The daily average high (red line) and low (blue line) temperature, with 25th to 75th and 10th to 90th percentile bands. The thin dotted lines are the corresponding average perceived temperatures.

The figure below shows you a compact characterization of the entire year of hourly average temperatures. The horizontal axis is the day of the year, the vertical axis is the hour of the day, and the color is the average temperature for that hour and day.

Average Hourly Temperature

Average Hourly Temperature in Atascadero12 AM4 AM8 AM12 PM4 PM8 PM12 AMJanFebMarAprMayJunJulAugSepOctNovDecchillycoldcoolcomfortablewarm
The average hourly temperature, color coded into bands: frigid < 15°F < freezing < 32°F < chilly < 45°F < cold < 55°F < cool < 65°F < comfortable < 75°F < warm < 85°F < hot < 95°F < sweltering. The shaded overlays indicate night and civil twilight.

Clouds

In Atascadero, the average percentage of the sky covered by clouds experiences significant seasonal variation over the course of the year.

The clearer part of the year in Atascadero begins around May 6 and lasts for 5.8 months, ending around November 1. On August 8, the clearest day of the year, the sky is clear, mostly clear, or partly cloudy 92% of the time, and overcast or mostly cloudy 8% of the time.

The cloudier part of the year begins around November 1 and lasts for 6.2 months, ending around May 6. On February 17, the cloudiest day of the year, the sky is overcast or mostly cloudy 48% of the time, and clear, mostly clear, or partly cloudy 52% of the time.

Cloud Cover

Cloud Cover in Atascaderoclearercloudiercloudier0%10%20%30%40%50%60%70%80%90%100%JanFebMarAprMayJunJulAugSepOctNovDecFeb 1748%Feb 1748%Aug 88%Aug 88%May 628%May 628%Nov 128%Nov 128%overcastpartly cloudyclear
The percentage of time spent in each cloud cover band, categorized by the percentage of the sky covered by clouds: clear < 20% < mostly clear < 40% < partly cloudy < 60% < mostly cloudy < 80% < overcast.

Precipitation

A wet day is one with at least 0.04 inches of liquid or liquid-equivalent precipitation. The chance of wet days in Atascadero varies throughout the year.

The wetter season lasts 4.4 months, from November 19 to March 31, with a greater than 12% chance of a given day being a wet day. The chance of a wet day peaks at 24% on February 19.

The drier season lasts 7.6 months, from March 31 to November 19. The smallest chance of a wet day is 0% on July 26.

Among wet days, we distinguish between those that experience rain alone, snow alone, or a mixture of the two. Based on this categorization, the most common form of precipitation throughout the year is rain alone, with a peak probability of 24% on February 19.

Daily Chance of Precipitation

Daily Chance of Precipitation in Atascaderowetwetdry0%10%20%30%40%50%60%70%80%90%100%JanFebMarAprMayJunJulAugSepOctNovDecFeb 1924%Feb 1924%Jul 260%Jul 260%Jan 120%Jan 120%Nov 1912%Nov 1912%Mar 3112%Mar 3112%rainmixed
The percentage of days in which various types of precipitation are observed, excluding trace quantities: rain alone, snow alone, and mixed (both rain and snow fell in the same day).

Rainfall

To show variation within the months and not just the monthly totals, we show the rainfall accumulated over a sliding 31-day period centered around each day of the year. Atascadero experiences significant seasonal variation in monthly rainfall.

The rainy period of the year lasts for 6.5 months, from October 13 to April 28, with a sliding 31-day rainfall of at least 0.5 inches. The most rain falls during the 31 days centered around February 16, with an average total accumulation of 2.9 inches.

The rainless period of the year lasts for 5.5 months, from April 28 to October 13. The least rain falls around August 6, with an average total accumulation of 0.0 inches.

Average Monthly Rainfall

The average rainfall (solid line) accumulated over the course of a sliding 31-day period centered on the day in question, with 25th to 75th and 10th to 90th percentile bands. The thin dotted line is the corresponding average liquid-equivalent snowfall.

Sun

The length of the day in Atascadero varies significantly over the course of the year. In 2017, the shortest day is December 21, with 9 hours, 46 minutes of daylight; the longest day is June 21, with 14 hours, 34 minutes of daylight.

Hours of Daylight and Twilight

The number of hours during which the Sun is visible (black line). From bottom (most yellow) to top (most gray), the color bands indicate: full daylight, twilight (civil, nautical, and astronomical), and full night.

The earliest sunrise is at 5:46 AM on June 12, and the latest sunrise is 1 hour, 41 minutes later at 7:27 AM on November 4. The earliest sunset is at 4:49 PM on December 5, and the latest sunset is 3 hours, 33 minutes later at 8:22 PM on June 28.

Daylight saving time (DST) is observed in Atascadero during 2017, starting in the spring on March 12, lasting 7.8 months, and ending in the fall on November 5.

Sunrise & Sunset with Twilight and Daylight Saving Time

Sunrise & Sunset with Twilight and Daylight Saving Time in Atascadero12 AM2 AM4 AM6 AM8 AM10 AM12 PM2 PM4 PM6 PM8 PM10 PM12 AMJanFebMarAprMayJunJulAugSepOctNovDecJun 125:46 AMJun 125:46 AM8:22 PMJun 288:22 PMJun 28Dec 54:49 PMDec 54:49 PM7:27 AMNov 47:27 AMNov 4Mar 12DSTMar 12DSTDSTNov 5DSTNov 5daynightnightnightnight
The solar day over the course of the year 2017. From bottom to top, the black lines are the previous solar midnight, sunrise, solar noon, sunset, and the next solar midnight. The day, twilights (civil, nautical, and astronomical), and night are indicated by the color bands from yellow to gray. The transitions to and from daylight saving time are indicated by the 'DST' labels.

Humidity

We base the humidity comfort level on the dew point, as it determines whether perspiration will evaporate from the skin, thereby cooling the body. Lower dew points feel drier and higher dew points feel more humid. Unlike temperature, which typically varies significantly between night and day, dew point tends to change more slowly, so while the temperature may drop at night, a muggy day is typically followed by a muggy night.

The perceived humidity level in Atascadero, as measured by the percentage of time in which the humidity comfort level is muggy, oppressive, or miserable, does not vary significantly over the course of the year, remaining a virtually constant 0% throughout.

Humidity Comfort Levels

Humidity Comfort Levels in Atascadero0%10%20%30%40%50%60%70%80%90%100%JanFebMarAprMayJunJulAugSepOctNovDecFeb 260%Feb 260%Sep 10%Sep 10%comfortablecomfortabledrydry
The percentage of time spent at various humidity comfort levels, categorized by dew point: dry < 55°F < comfortable < 60°F < humid < 65°F < muggy < 70°F < oppressive < 75°F < miserable.

Wind

This section discusses the wide-area hourly average wind vector (speed and direction) at 10 meters above the ground. The wind experienced at any given location is highly dependent on local topography and other factors, and instantaneous wind speed and direction vary more widely than hourly averages.

The average hourly wind speed in Atascadero experiences mild seasonal variation over the course of the year.

The windier part of the year lasts for 5.4 months, from January 22 to July 4, with average wind speeds of more than 4.1 miles per hour. The windiest day of the year is May 29, with an average hourly wind speed of 4.7 miles per hour.

The calmer time of year lasts for 6.6 months, from July 4 to January 22. The calmest day of the year is September 10, with an average hourly wind speed of 3.6 miles per hour.

Average Wind Speed

The average of mean hourly wind speeds (dark gray line), with 25th to 75th and 10th to 90th percentile bands.

The predominant average hourly wind direction in Atascadero varies throughout the year.

The wind is most often from the west for 5.4 months, from April 28 to October 10, with a peak percentage of 73% on July 30. The wind is most often from the north for 6.6 months, from October 10 to April 28, with a peak percentage of 33% on January 1.

Wind Direction

Wind Direction in AtascaderoNWN0%20%40%60%80%100%JanFebMarAprMayJunJulAugSepOctNovDecwestsoutheastnorth
The percentage of hours in which the mean wind direction is from each of the four cardinal wind directions (north, east, south, and west), excluding hours in which the mean wind speed is less than 1 mph. The lightly tinted areas at the boundaries are the percentage of hours spent in the implied intermediate directions (northeast, southeast, southwest, and northwest).

Water Temperature

Atascadero is located near a large body of water (e.g., ocean, sea, or large lake). This section reports on the wide-area average surface temperature of that water.

The average water temperature experiences some seasonal variation over the course of the year.

The time of year with warmer water lasts for 3.2 months, from July 29 to November 4, with an average temperature above 59°F. The day of the year with the warmest water is September 24, with an average temperature of 60°F.

The time of year with cooler water lasts for 3.2 months, from March 5 to June 10, with an average temperature below 55°F. The day of the year with the coolest water is April 19, with an average temperature of 54°F.

Average Water Temperature

The daily average water temperature (purple line), with 25th to 75th and 10th to 90th percentile bands.

Solar Energy

This section discusses the total daily incident shortwave solar energy reaching the surface of the ground over a wide area, taking full account of seasonal variations in the length of the day, the elevation of the Sun above the horizon, and absorption by clouds and other atmospheric constituents. Shortwave radiation includes visible light and ultraviolet radiation.

The average daily incident shortwave solar energy experiences extreme seasonal variation over the course of the year.

The brighter period of the year lasts for 3.7 months, from May 1 to August 24, with an average daily incident shortwave energy per square meter above 7.4 kWh. The brightest day of the year is June 21, with an average of 8.6 kWh.

The darker period of the year lasts for 3.4 months, from November 5 to February 16, with an average daily incident shortwave energy per square meter below 3.9 kWh. The darkest day of the year is December 23, with an average of 2.6 kWh.

Average Daily Incident Shortwave Solar Energy

Average Daily Incident Shortwave Solar Energy in Atascaderobrightdarkdark0 kWh1 kWh2 kWh3 kWh4 kWh5 kWh6 kWh7 kWh8 kWh9 kWh10 kWhJanFebMarAprMayJunJulAugSepOctNovDecJun 218.6 kWhJun 218.6 kWhDec 232.6 kWhDec 232.6 kWhMay 17.4 kWhMay 17.4 kWhAug 247.4 kWhAug 247.4 kWhNov 53.9 kWhNov 53.9 kWhFeb 163.8 kWhFeb 163.8 kWh
The average daily shortwave solar energy reaching the ground per square meter (orange line), with 25th to 75th and 10th to 90th percentile bands.

Topography

For the purposes of this report, the geographical coordinates of Atascadero are 35.489 deg latitude, -120.671 deg longitude, and 968 ft elevation.

The topography within 2 miles of Atascadero contains significant variations in elevation, with a maximum elevation change of 515 feet and an average elevation above sea level of 939 feet. Within 10 miles contains significant variations in elevation (2,562 feet). Within 50 miles contains large variations in elevation (4,731 feet).

The area within 2 miles of Atascadero is covered by artificial surfaces (54%) and grassland (36%), within 10 miles by grassland (64%) and shrubs (21%), and within 50 miles by grassland (44%) and water (28%).

Data Sources

This report illustrates the typical weather in Atascadero, based on a statistical analysis of historical hourly weather reports and model reconstructions from January 1, 1980 to December 31, 2016.

Temperature and Dew Point

There are 3 weather stations near enough to contribute to our estimation of the temperature and dew point in Atascadero.

For each station, the records are corrected for the elevation difference between that station and Atascadero according to the International Standard Atmosphere , and by the relative change present in the MERRA-2 satellite-era reanalysis between the two locations.

The estimated value at Atascadero is computed as the weighted average of the individual contributions from each station, with weights proportional to the inverse of the distance between Atascadero and a given station.

The stations contributing to this reconstruction are: Paso Robles Municipal Airport (62%, 20 kilometers, north); San Luis Obispo County Airport (27%, 28 kilometers, south); and Point Piedras Blanca (11%, 59 kilometers, west).

Other Data

All data relating to the Sun's position (e.g., sunrise and sunset) are computed using astronomical formulas from the book, Astronomical Tables of the Sun, Moon and Planets , by Jean Meeus.

All other weather data, including cloud cover, precipitation, wind speed and direction, and solar flux, come from NASA's MERRA-2 Modern-Era Retrospective Analysis . This reanalysis combines a variety of wide-area measurements in a state-of-the-art global meteorological model to reconstruct the hourly history of weather throughout the world on a 50-kilometer grid.

Land Use data comes from the Global Land Cover SHARE database , published by the Food and Agriculture Organization of the United Nations.

Elevation data comes from the Shuttle Radar Topography Mission (SRTM) , published by NASA's Jet Propulsion Laboratory.

Names, locations, and time zones of places and some airports come from the GeoNames Geographical Database .

Time zones for aiports and weather stations are provided by AskGeo.com .

Maps are © Esri, with data from National Geographic, Esri, DeLorme, NAVTEQ, UNEP-WCMC, USGS, NASA, ESA, METI, NRCAN, GEBCO, NOAA, and iPC.