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August Weather at Clinton Municipal Airport Iowa, United States

Daily high temperatures decrease by 4°F, from 83°F to 79°F, rarely falling below 70°F or exceeding 91°F.

Daily low temperatures decrease by 4°F, from 63°F to 59°F, rarely falling below 49°F or exceeding 71°F.

For reference, on July 18, the hottest day of the year, temperatures at Clinton Municipal Airport typically range from 64°F to 84°F, while on January 22, the coldest day of the year, they range from 14°F to 29°F.

Average High and Low Temperature in August at Clinton Municipal Airport

Average High and Low Temperature in August at Clinton Municipal AirportAug112233445566778899101011111212131314141515161617171818191920202121222223232424252526262727282829293030313135°F35°F40°F40°F45°F45°F50°F50°F55°F55°F60°F60°F65°F65°F70°F70°F75°F75°F80°F80°F85°F85°F90°F90°F95°F95°FJulSepAug 183°FAug 183°F63°F63°FAug 3179°FAug 3179°F59°F59°FAug 1182°FAug 1182°F62°F62°FAug 2181°FAug 2181°F61°F61°F
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 at Clinton Municipal Airport

Average Hourly Temperature in August at Clinton Municipal AirportAug112233445566778899101011111212131314141515161617171818191920202121222223232424252526262727282829293030313112 AM12 AM2 AM2 AM4 AM4 AM6 AM6 AM8 AM8 AM10 AM10 AM12 PM12 PM2 PM2 PM4 PM4 PM6 PM6 PM8 PM8 PM10 PM10 PM12 AM12 AMJulSepcoldcoolcoolcomfortablecomfortablewarmcold
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 average hourly temperature, color coded into bands. The shaded overlays indicate night and civil twilight.

Byureghavan, Armenia (6,105 miles away); Almaty, Kazakhstan (6,512 miles); and Hoeyang, North Korea (6,390 miles) are the far-away foreign places with temperatures most similar to Clinton Municipal Airport (view comparison).

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The month of August at Clinton Municipal Airport experiences essentially constant cloud cover, with the percentage of time that the sky is overcast or mostly cloudy remaining about 32% throughout the month. The lowest chance of overcast or mostly cloudy conditions is 31% on August 25.

The clearest day of the month is August 25, with clear, mostly clear, or partly cloudy conditions 69% of the time.

For reference, on December 28, the cloudiest day of the year, the chance of overcast or mostly cloudy conditions is 57%, while on August 25, the clearest day of the year, the chance of clear, mostly clear, or partly cloudy skies is 69%.

Cloud Cover Categories in August at Clinton Municipal Airport

Cloud Cover Categories in August at Clinton Municipal AirportAug11223344556677889910101111121213131414151516161717181819192020212122222323242425252626272728282929303031310%100%10%90%20%80%30%70%40%60%50%50%60%40%70%30%80%20%90%10%100%0%JulSepDec 2843%Dec 2843%Aug 168%Aug 168%Aug 3168%Aug 3168%Aug 1168%Aug 1168%Aug 2168%Aug 2168%clearmostly clearpartly cloudymostly cloudyovercast
0% clear 20% mostly clear 40% partly cloudy 60% mostly cloudy 80% overcast 100%
The percentage of time spent in each cloud cover band, categorized by the percentage of the sky covered by clouds.

A wet day is one with at least 0.04 inches of liquid or liquid-equivalent precipitation. At Clinton Municipal Airport, the chance of a wet day over the course of August is decreasing, starting the month at 36% and ending it at 32%.

For reference, the year's highest daily chance of a wet day is 41% on June 13, and its lowest chance is 12% on January 29.

Probability of Precipitation in August at Clinton Municipal Airport

Probability of Precipitation in August at Clinton Municipal AirportAug11223344556677889910101111121213131414151516161717181819192020212122222323242425252626272728282929303031310%0%5%5%10%10%15%15%20%20%25%25%30%30%35%35%40%40%JulSepAug 136%Aug 136%Aug 3132%Aug 3132%Aug 1136%Aug 1136%Aug 2134%Aug 2134%rain
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 at Clinton Municipal Airport is essentially constant, remaining about 3.5 inches throughout, and rarely exceeding 6.6 inches or falling below 1.4 inches.

Average Monthly Rainfall in August at Clinton Municipal Airport

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 snowfall.

Over the course of August at Clinton Municipal Airport, 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, 14 minutes, implying an average daily decrease of 2 minutes, 28 seconds, and weekly decrease of 17 minutes, 19 seconds.

The shortest day of the month is August 31, with 13 hours, 9 minutes of daylight and the longest day is August 1, with 14 hours, 23 minutes of daylight.

Hours of Daylight and Twilight in August at Clinton Municipal Airport

Hours of Daylight and Twilight in August at Clinton Municipal AirportAug11223344556677889910101111121213131414151516161717181819192020212122222323242425252626272728282929303031310 hr24 hr4 hr20 hr8 hr16 hr12 hr12 hr16 hr8 hr20 hr4 hr24 hr0 hrJulSepnightnightdaydayAug 114 hr, 23 minAug 114 hr, 23 minAug 3113 hr, 9 minAug 3113 hr, 9 minAug 1613 hr, 48 minAug 1613 hr, 48 min
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 at Clinton Municipal Airport is 5:55 AM on August 1 and the latest sunrise is 31 minutes later at 6:26 AM on August 31.

The latest sunset is 8:18 PM on August 1 and the earliest sunset is 43 minutes earlier at 7:35 PM on August 31.

Daylight saving time is observed at Clinton Municipal Airport during 2024, but it neither starts nor ends during August, so the entire month is in standard time.

For reference, on June 20, the longest day of the year, the Sun rises at 5:26 AM and sets 15 hours, 13 minutes later, at 8:39 PM, while on December 21, the shortest day of the year, it rises at 7:25 AM and sets 9 hours, 8 minutes later, at 4:33 PM.

Sunrise & Sunset with Twilight in August at Clinton Municipal Airport

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.

The figure below presents a compact representation of the sun's elevation (the angle of the sun above the horizon) and azimuth (its compass bearing) for every hour of every day in the reporting period. The horizontal axis is the day of the year and the vertical axis is the hour of the day. For a given day and hour of that day, the background color indicates the azimuth of the sun at that moment. The black isolines are contours of constant solar elevation.

Solar Elevation and Azimuth in August at Clinton Municipal Airport

Solar Elevation and Azimuth in August at Clinton Municipal AirportAug112233445566778899101011111212131314141515161617171818191920202121222223232424252526262727282829293030313112 AM12 AM2 AM2 AM4 AM4 AM6 AM6 AM8 AM8 AM10 AM10 AM12 PM12 PM2 PM2 PM4 PM4 PM6 PM6 PM8 PM8 PM10 PM10 PM12 AM12 AMJulSep0010102020203030404050506000010102020303030404050506060
northeastsouthwest
Solar elevation and azimuth over the course of August 2024. The black lines are lines of constant solar elevation (the angle of the sun above the horizon, in degrees). The background color fills indicate the azimuth (the compass bearing) of the sun. The lightly tinted areas at the boundaries of the cardinal compass points indicate the implied intermediate directions (northeast, southeast, southwest, and northwest).

The figure below presents a compact representation of key lunar data for August 2024. The horizontal axis is the day, the vertical axis is the hour of the day, and the colored areas indicate when the moon is above the horizon. The vertical gray bars (new Moons) and blue bars (full Moons) indicate key Moon phases. The label associated with each bar indicates the date and time that the phase is obtained, and the companion time labels indicate the rise and set times of the Moon for the nearest time interval in which the moon is above the horizon.

Moon Rise, Set & Phases in August at Clinton Municipal Airport

Moon Rise, Set & Phases in August at Clinton Municipal AirportAug112233445566778899101011111212131314141515161617171818191920202121222223232424252526262727282829293030313112 AM12 AM4 AM4 AM8 AM8 AM12 PM12 PM4 PM4 PM8 PM8 PM12 AM12 AMJulSepJul 55:58 PMJul 55:58 PMJul 215:18 AMJul 215:18 AMAug 46:14 AMAug 46:14 AMAug 191:26 PMAug 191:26 PMSep 28:56 PMSep 28:56 PMSep 179:35 PMSep 179:35 PM4:43 AM4:43 AM9:06 PM9:06 PM8:35 PM8:35 PM5:34 AM5:34 AM5:50 AM5:50 AM8:49 PM8:49 PM8:14 PM8:14 PM7:08 AM7:08 AM5:51 AM5:51 AM7:37 PM7:37 PM7:03 PM7:03 PM7:18 AM7:18 AM
The time in which the moon is above the horizon (light blue area), with new moons (dark gray lines) and full moons (blue lines) indicated. The shaded overlays indicate night and civil twilight.
Aug 2024IlluminationMoonriseMoonsetMoonriseMeridian PassingDistance
1
8%2:34 AMNE7:01 PMNW-10:49 AMS240,790 mi
2
3%3:36 AMNE7:46 PMNW-11:44 AMS243,007 mi
3
1%4:42 AMNE8:21 PMWNW-12:36 PMS245,146 mi
4
0%5:50 AMENE8:49 PMWNW-1:24 PMS247,146 mi
5
2%6:57 AMENE9:12 PMWNW-2:08 PMS248,925 mi
6
5%8:01 AMENE9:32 PMW-2:49 PMS250,377 mi
7
10%9:03 AME9:50 PMW-3:29 PMS251,385 mi
8
17%10:03 AME10:07 PMW-4:07 PMS251,828 mi
9
25%11:04 AME10:26 PMWSW-4:46 PMS251,599 mi
10
34%12:05 PMESE10:46 PMWSW-5:26 PMS250,621 mi
11
44%1:09 PMESE11:09 PMWSW-6:09 PMS248,859 mi
12
50%2:14 PMESE11:37 PMWSW-6:56 PMS246,340 mi
13
64%3:21 PMSE--7:47 PMS243,160 mi
14
74%-12:13 AMSW4:28 PMSE8:44 PMS239,496 mi
15
83%-12:59 AMSW5:30 PMSE9:44 PMS235,604 mi
16
91%-1:58 AMSW6:24 PMSE10:46 PMS231,806 mi
17
96%-3:08 AMSW7:09 PMESE11:47 PMS228,450 mi
18
98%-4:26 AMWSW7:45 PMESE--
19
100%-5:47 AMWSW8:14 PMESE12:45 AMS225,860 mi
20
100%-7:08 AMWSW8:40 PME1:40 AMS224,276 mi
21
97%-8:27 AMW9:04 PME2:32 AMS223,819 mi
22
91%-9:45 AMW9:27 PME3:22 AMS224,470 mi
23
82%-11:03 AMWNW9:52 PMENE4:11 AMS226,091 mi
24
72%-12:21 PMWNW10:21 PMENE5:02 AMS228,455 mi
25
60%-1:38 PMWNW10:55 PMENE5:54 AMS231,299 mi
26
50%-2:53 PMNW11:37 PMNE6:49 AMS234,367 mi
27
38%-4:01 PMNW-7:46 AMS237,443 mi
28
27%12:28 AMNE4:59 PMNW-8:44 AMS240,368 mi
29
18%1:28 AMNE5:46 PMNW-9:40 AMS243,043 mi
30
11%2:33 AMNE6:23 PMWNW-10:32 AMS245,416 mi
31
5%3:40 AMENE6:52 PMWNW-11:21 AMS247,469 mi

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 at Clinton Municipal Airport is rapidly decreasing during August, falling from 42% to 25% over the course of the month.

For reference, on July 20, the muggiest day of the year, there are muggy conditions 44% 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 at Clinton Municipal Airport

Humidity Comfort Levels in August at Clinton Municipal AirportAug11223344556677889910101111121213131414151516161717181819192020212122222323242425252626272728282929303031310%0%10%10%20%20%30%30%40%40%50%50%60%60%70%70%80%80%90%90%100%100%JulSepAug 142%Aug 142%Aug 3125%Aug 3125%Aug 1137%Aug 1137%Aug 2132%Aug 2132%oppressiveoppressivemuggymuggyhumidhumidcomfortablecomfortabledrydrymiserablemiserable
dry 55°F comfortable 60°F humid 65°F muggy 70°F oppressive 75°F miserable
The percentage of time spent at various humidity comfort levels, categorized by dew point.

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 at Clinton Municipal Airport is gradually increasing during August, increasing from 7.6 miles per hour to 8.3 miles per hour over the course of the month.

For reference, on March 22, the windiest day of the year, the daily average wind speed is 12.4 miles per hour, while on August 2, the calmest day of the year, the daily average wind speed is 7.6 miles per hour.

The lowest daily average wind speed during August is 7.6 miles per hour on August 2.

Average Wind Speed in August at Clinton Municipal Airport

Average Wind Speed in August at Clinton Municipal AirportAug11223344556677889910101111121213131414151516161717181819192020212122222323242425252626272728282929303031310 mph0 mph2 mph2 mph4 mph4 mph6 mph6 mph8 mph8 mph10 mph10 mph12 mph12 mph14 mph14 mphJulSepAug 27.6 mphAug 27.6 mphAug 318.3 mphAug 318.3 mphAug 217.8 mphAug 217.8 mph
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 at Clinton Municipal Airport throughout August is predominantly from the south, with a peak proportion of 37% on August 28.

Wind Direction in August at Clinton Municipal Airport

Wind Direction in August at Clinton Municipal AirportAug11223344556677889910101111121213131414151516161717181819192020212122222323242425252626272728282929303031310%100%20%80%40%60%60%40%80%20%100%0%JulSepwestsoutheastnorth
northeastsouthwest
The percentage of hours in which the mean wind direction is from each of the four cardinal wind directions, excluding hours in which the mean wind speed is less than 1.0 mph. The lightly tinted areas at the boundaries are the percentage of hours spent in the implied intermediate directions (northeast, southeast, southwest, and northwest).

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 at Clinton Municipal Airport typically lasts for 5.6 months (171 days), from around April 21 to around October 9, rarely starting before April 1 or after May 8, and rarely ending before September 19 or after October 28.

The month of August at Clinton Municipal Airport is reliably fully within the growing season.

Time Spent in Various Temperature Bands and the Growing Season in August at Clinton Municipal Airport

Time Spent in Various Temperature Bands and the Growing Season in August at Clinton Municipal Airportgrowing seasonAug11223344556677889910101111121213131414151516161717181819192020212122222323242425252626272728282929303031310%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 1690%Sep 1990%Sep 19Jul 14100%Jul 14100%coldcoolcomfortablewarmhotvery cold
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 percentage of time spent in various temperature bands. 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 at Clinton Municipal Airport are rapidly increasing during August, increasing by 616°F, from 1,890°F to 2,506°F, over the course of the month.

Growing Degree Days in August at Clinton Municipal Airport

Growing Degree Days in August at Clinton Municipal AirportAug11223344556677889910101111121213131414151516161717181819192020212122222323242425252626272728282929303031311,800°F1,800°F2,000°F2,000°F2,200°F2,200°F2,400°F2,400°F2,600°F2,600°F2,800°F2,800°FJulSepAug 11,890°FAug 11,890°FAug 312,506°FAug 312,506°FAug 112,106°FAug 112,106°FAug 212,313°FAug 212,313°F
The average growing degree days accumulated over the course of August, with 25th to 75th and 10th to 90th percentile bands.

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 at Clinton Municipal Airport is gradually decreasing during August, falling by 0.9 kWh, from 6.5 kWh to 5.6 kWh, over the course of the month.

Average Daily Incident Shortwave Solar Energy in August at Clinton Municipal Airport

Average Daily Incident Shortwave Solar Energy in August at Clinton Municipal AirportAug11223344556677889910101111121213131414151516161717181819192020212122222323242425252626272728282929303031310 kWh0 kWh1 kWh1 kWh2 kWh2 kWh3 kWh3 kWh4 kWh4 kWh5 kWh5 kWh6 kWh6 kWh7 kWh7 kWh8 kWh8 kWh9 kWh9 kWhJulSepAug 16.5 kWhAug 16.5 kWhAug 315.6 kWhAug 315.6 kWhAug 116.3 kWhAug 116.3 kWhAug 216.0 kWhAug 216.0 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.

For the purposes of this report, the geographical coordinates of Clinton Municipal Airport are 41.831 deg latitude, -90.329 deg longitude, and 689 ft elevation.

The topography within 2 miles of Clinton Municipal Airport contains only modest variations in elevation, with a maximum elevation change of 128 feet and an average elevation above sea level of 681 feet. Within 10 miles also contains only modest variations in elevation (331 feet). Within 50 miles contains only modest variations in elevation (778 feet).

The area within 2 miles of Clinton Municipal Airport is covered by cropland (100%), within 10 miles by cropland (82%), and within 50 miles by cropland (87%).

This report illustrates the typical weather at Clinton Municipal Airport, 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

Clinton Municipal Airport has a weather station that reported reliably enough during the analysis period that we have included it in our network. When available, historical temperature and dew point measurements are taken directly from this weather station. These records are obtained from NOAA's Integrated Surface Hourly data set, falling back on ICAO METAR records as required.

In the case of missing or erroneous measurements from this station, we fall back on records from nearby stations, adjusted according to typical seasonal and diurnal intra-station differences. For a given day of the year and hour of the day, the fallback station is selected to minimize the prediction error over the years for which there are measurements for both stations.

The stations on which we may fall back include but are not limited to Tri-Township Airport, Davenport Municipal Airport, Quad City International Airport, Sterling Rockfalls, Dubuque Regional Airport, Albertus Airport, Platteville Municipal Airport, and Galesburg Municipal Airport.

Other Data

All data relating to the Sun's position (e.g., sunrise and sunset) are computed using astronomical formulas from the book, Astronomical Algorithms 2nd Edition , 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 airports and weather stations are provided by AskGeo.com .

Maps are © OpenStreetMap contributors.

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.

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