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Average Weather in August in Placerville California, United States

In Placerville, the month of August is characterized by gradually falling daily high temperatures, with daily highs decreasing by 3°F, from 90°F to 87°F over the course of the month, and rarely exceeding 98°F or dropping below 79°F.

Daily low temperatures decrease by 3°F, from 68°F to 65°F, rarely falling below 57°F or exceeding 76°F.

For reference, on July 27, the hottest day of the year, temperatures in Placerville typically range from 68°F to 90°F, while on December 27, the coldest day of the year, they range from 41°F to 53°F.

Average High and Low Temperature in August

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 hourly average temperatures for the quarter of the year centered on August. The horizontal axis is the day, the vertical axis is the hour of the day, and the color is the average temperature for that hour and day.

Average Hourly Temperature in August

Average Hourly Temperature in August in Placerville18152229112233445566778899101011111212131314141515161617171818191920202121222223232424252526262727282829293030313112 AM4 AM8 AM12 PM4 PM8 PM12 AMJulSepcoolwarmhotcomfortable
The average hourly temperature, color coded into bands: frigid < 15°F < freezing < 32°F < very cold < 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

The month of August in Placerville experiences essentially constant cloud cover, with the percentage of time that the sky is overcast or mostly cloudy remaining about 11% throughout the month.

The clearest day of the month is August 8, with clear, mostly clear, or partly cloudy conditions 90% of the time.

For reference, on February 21, the cloudiest day of the year, the chance of overcast or mostly cloudy conditions is 59%, while on July 29, the clearest day of the year, the chance of clear, mostly clear, or partly cloudy skies is 91%.

Cloud Cover Categories in August

Cloud Cover Categories in August in Placerville1815222911223344556677889910101111121213131414151516161717181819192020212122222323242425252626272728282929303031310%100%10%90%20%80%30%70%40%60%50%50%60%40%70%30%80%20%90%10%100%0%JulSepAug 190%Aug 190%Aug 3188%Aug 3188%Aug 1190%Aug 1190%Aug 2189%Aug 2189%clearovercastmostly clearmostly cloudypartly cloudy
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. In Placerville, the chance of a wet day over the course of August is essentially constant, remaining around 1% throughout.

For reference, the year's highest daily chance of a wet day is 34% on March 1, and its lowest chance is 0% on July 21.

Probability of Precipitation in August

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 month and not just the monthly total, we show the rainfall accumulated over a sliding 31-day period centered around each day.

The average sliding 31-day rainfall during August in Placerville is essentially constant, remaining about 0.1 inches throughout, and rarely exceeding 0.6 inches.

Average Monthly Rainfall in August

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

Over the course of August in Placerville, the length of the day is rapidly decreasing. From the start to the end of the month, the length of the day decreases by 1 hour, 6 minutes, implying an average daily decrease of 2 minutes, 12 seconds, and weekly decrease of 15 minutes, 25 seconds.

The shortest day of the month is August 31, with 13 hours, 3 minutes of daylight and the longest day is August 1, with 14 hours, 9 minutes of daylight.

Hours of Daylight and Twilight in August

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 of the month in Placerville is 6:04 AM on August 1 and the latest sunrise is 27 minutes later at 6:31 AM on August 31.

The latest sunset is 8:13 PM on August 1 and the earliest sunset is 39 minutes earlier at 7:34 PM on August 31.

Daylight saving time is observed in Placerville during 2017, but it neither starts nor ends during August, so the entire month is in daylight saving time.

For reference, on June 21, the longest day of the year, the Sun rises at 5:38 AM and sets 14 hours, 53 minutes later, at 8:31 PM, while on December 21, the shortest day of the year, it rises at 7:17 AM and sets 9 hours, 27 minutes later, at 4:45 PM.

Sunrise & Sunset with Twilight in August

The solar day over the course of August. 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.

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 chance that a given day will be muggy in Placerville is essentially constant during August, remaining around 0% throughout.

The lowest chance of a muggy day during August is 0% on August 14.

For reference, on May 25, the muggiest day of the year, there are muggy conditions 0% of the time, while on January 1, the least muggy day of the year, there are muggy conditions 0% of the time.

Humidity Comfort Levels in August

Humidity Comfort Levels in August in Placerville1815222911223344556677889910101111121213131414151516161717181819192020212122222323242425252626272728282929303031310%10%20%30%40%50%60%70%80%90%100%JulSepAug 140%Aug 140%Aug 10%Aug 10%Aug 310%Aug 310%drydrycomfortablecomfortable
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 Placerville is essentially constant during August, remaining within 0.1 miles per hour of 5.4 miles per hour throughout.

For reference, on December 18, the windiest day of the year, the daily average wind speed is 6.2 miles per hour, while on September 24, the calmest day of the year, the daily average wind speed is 5.2 miles per hour.

Average Wind Speed in August

The average of mean hourly wind speeds (dark gray line), with 25th to 75th and 10th to 90th percentile bands.
The hourly average wind direction in Placerville throughout August is predominantly from the west, with a peak proportion of 42% on August 1.

Wind Direction in August

Wind Direction in August in PlacervilleWE1815222911223344556677889910101111121213131414151516161717181819192020212122222323242425252626272728282929303031310%100%10%90%20%80%30%70%40%60%50%50%60%40%70%30%80%20%90%10%100%0%JulSepeastwestsouthnorth
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).

Growing Season

Definitions of the growing season vary throughout the world, but for the purposes of this report, we define it as the longest continuous period of non-freezing temperatures (≥ 32°F) in the year (the calendar year in the Northern Hemisphere, or from July 1 until June 30 in the Southern Hemisphere).

The growing season in Placerville typically lasts for 10 months (308 days), from around February 19 to around December 24, rarely starting after April 4, or ending before November 21.

The month of August in Placerville is reliably fully within the growing season.

Time Spent in Various Temperature Bands and the Growing Season in August

Time Spent in Various Temperature Bands and the Growing Season in August in Placervillegrowing seasongrowing season1815222911223344556677889910101111121213131414151516161717181819192020212122222323242425252626272728282929303031310%100%10%90%20%80%30%70%40%60%50%50%60%40%70%30%80%20%90%10%100%0%JulSep100%Aug 16100%Aug 16Aug 1100%Aug 1100%coldwarmhotcoolcomfortablesweltering
The percentage of time spent in various temperature bands: frigid < 15°F < freezing < 32°F < very cold < 45°F < cold < 55°F < cool < 65°F < comfortable < 75°F < warm < 85°F < hot < 95°F < sweltering. The black line is the percentage chance that a given day is within the growing season.

Growing degree days are a measure of yearly heat accumulation used to predict plant and animal development, and defined as the integral of warmth above a base temperature, discarding any excess above a maximum temperature. In this report, we use a base of 50°F and a cap of 86°F.

The average accumulated growing degree days in Placerville is rapidly increasing during August, increasing by 779°F, from 2,335°F to 3,114°F, over the course of the month.

Growing Degree Days in August

The average growing degree days accumulated over the course of August, 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 in Placerville is decreasing during August, falling by 1.1 kWh, from 8.0 kWh to 6.9 kWh, over the course of the month.

Average Daily Incident Shortwave Solar Energy in August

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 Placerville are 38.730 deg latitude, -120.799 deg longitude, and 1,890 ft elevation.

The topography within 2 miles of Placerville contains very significant variations in elevation, with a maximum elevation change of 1,302 feet and an average elevation above sea level of 1,977 feet. Within 10 miles contains very significant variations in elevation (3,199 feet). Within 50 miles contains large variations in elevation (10,850 feet).

The area within 2 miles of Placerville is covered by shrubs (81%), within 10 miles by shrubs (54%) and trees (29%), and within 50 miles by trees (37%) and grassland (21%).

Data Sources

This report illustrates the typical weather in Placerville year round, 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 Placerville.

For each station, the records are corrected for the elevation difference between that station and Placerville 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 Placerville is computed as the weighted average of the individual contributions from each station, with weights proportional to the inverse of the distance between Placerville and a given station.

The stations contributing to this reconstruction are: Placerville Airport (62%, 4.4 kilometers, east); Auburn Municipal Airport (28%, 35 kilometers, northwest); and Sacramento Mather Airport (10%, 47 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.

Disclaimer

The information on this site is provided as is, without any assurances as to its accuracy or suitability for any purpose. Weather data is prone to errors, outages, and other defects. We assume no responsibility for any decisions made on the basis of the content presented on this site.

We draw particular cautious attention to our reliance on the MERRA-2 model-based reconstructions for a number of important data series. While having the tremendous advantages of temporal and spatial completeness, these reconstructions: (1) are based on computer models that may have model-based errors, (2) are coarsely sampled on a 50 km grid and are therefore unable to reconstruct the local variations of many microclimates, and (3) have particular difficulty with the weather in some coastal areas, especially small islands.

We further caution that our travel scores are only as good as the data that underpin them, that weather conditions at any given location and time are unpredictable and variable, and that the definition of the scores reflects a particular set of preferences that may not agree with those of any particular reader.