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Average Weather in August in McCordsville Indiana, United States

In McCordsville, the month of August is characterized by gradually falling daily high temperatures, with daily highs decreasing by 2°F, from 83°F to 81°F over the course of the month, and rarely exceeding 90°F or dropping below 73°F.

Daily low temperatures decrease by 4°F, from 65°F to 62°F, rarely falling below 52°F or exceeding 73°F.

For reference, on July 19, the hottest day of the year, temperatures in McCordsville typically range from 66°F to 84°F, while on January 29, the coldest day of the year, they range from 21°F to 35°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 McCordsville18152229112233445566778899101011111212131314141515161617171818191920202121222223232424252526262727282829293030313112 AM4 AM8 AM12 PM4 PM8 PM12 AMJulSepcoldcoolwarmcomfortable
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 McCordsville experiences essentially constant cloud cover, with the percentage of time that the sky is overcast or mostly cloudy remaining about 31% throughout the month. The lowest chance of overcast or mostly cloudy conditions is 30% on August 23.

The clearest day of the month is August 23, with clear, mostly clear, or partly cloudy conditions 70% of the time.

For reference, on January 2, the cloudiest day of the year, the chance of overcast or mostly cloudy conditions is 60%, while on August 23, the clearest day of the year, the chance of clear, mostly clear, or partly cloudy skies is 70%.

Cloud Cover Categories in August

Cloud Cover Categories in August in McCordsville1815222911223344556677889910101111121213131414151516161717181819192020212122222323242425252626272728282929303031310%100%10%90%20%80%30%70%40%60%50%50%60%40%70%30%80%20%90%10%100%0%JulSepJan 240%Jan 240%Aug 167%Aug 167%Aug 3169%Aug 3169%Aug 1169%Aug 1169%Aug 2169%Aug 2169%clearmostly clearmostly cloudyovercastpartly 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 McCordsville, the chance of a wet day over the course of August is very rapidly decreasing, starting the month at 38% and ending it at 29%.

For reference, the year's highest daily chance of a wet day is 42% on June 26, and its lowest chance is 20% on January 29.

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 McCordsville is essentially constant, remaining about 3.0 inches throughout, and rarely exceeding 5.4 inches or falling below 0.9 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 McCordsville, 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, 9 minutes, implying an average daily decrease of 2 minutes, 18 seconds, and weekly decrease of 16 minutes, 6 seconds.

The shortest day of the month is August 31, with 13 hours, 5 minutes of daylight and the longest day is August 1, with 14 hours, 14 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 McCordsville is 6:42 AM on August 1 and the latest sunrise is 28 minutes later at 7:10 AM on August 31.

The latest sunset is 8:56 PM on August 1 and the earliest sunset is 41 minutes earlier at 8:16 PM on August 31.

Daylight saving time is observed in McCordsville 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 6:15 AM and sets 15 hours, 0 minutes later, at 9:15 PM, while on December 21, the shortest day of the year, it rises at 8:01 AM and sets 9 hours, 20 minutes later, at 5:22 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 McCordsville is rapidly decreasing during August, falling from 54% to 36% over the course of the month.

For reference, on July 22, the muggiest day of the year, there are muggy conditions 55% 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 McCordsville1815222911223344556677889910101111121213131414151516161717181819192020212122222323242425252626272728282929303031310%10%20%30%40%50%60%70%80%90%100%JulSepAug 154%Aug 154%Aug 3136%Aug 3136%Aug 1147%Aug 1147%Aug 2143%Aug 2143%drydryhumidhumidmuggymuggyoppressiveoppressivecomfortablecomfortablemiserablemiserable
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 McCordsville is gradually increasing during August, increasing from 6.8 miles per hour to 7.4 miles per hour over the course of the month.

For reference, on April 1, the windiest day of the year, the daily average wind speed is 12.1 miles per hour, while on July 31, the calmest day of the year, the daily average wind speed is 6.8 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 wind direction in McCordsville during August is predominantly out of the west from August 1 to August 14 and the south from August 14 to August 31.

Wind Direction in August

Wind Direction in August in McCordsvilleWS1815222911223344556677889910101111121213131414151516161717181819192020212122222323242425252626272728282929303031310%100%10%90%20%80%30%70%40%60%50%50%60%40%70%30%80%20%90%10%100%0%JulSepeastwestnorthsouth
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).

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 McCordsville is gradually decreasing during August, falling by 0.8 kWh, from 6.6 kWh to 5.8 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 McCordsville are 39.908 deg latitude, -85.923 deg longitude, and 843 ft elevation.

The topography within 2 miles of McCordsville is essentially flat, with a maximum elevation change of 85 feet and an average elevation above sea level of 839 feet. Within 10 miles is essentially flat (446 feet). Within 50 miles contains only modest variations in elevation (902 feet).

The area within 2 miles of McCordsville is covered by cropland (64%) and artificial surfaces (29%), within 10 miles by cropland (59%) and artificial surfaces (37%), and within 50 miles by cropland (83%).

Data Sources

This report illustrates the typical weather in McCordsville 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 4 weather stations near enough to contribute to our estimation of the temperature and dew point in McCordsville.

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

The stations contributing to this reconstruction are: Indianapolis Executive Airport (33%, 31 kilometers, northwest); Eagle Creek Airpark (30%, 33 kilometers, west); Shelbyville Municipal Airport (24%, 38 kilometers, south); and Delaware County Regional Airport (13%, 58 kilometers, northeast).

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.