Summer 2020 Weather History at Washington Dulles International Airport Virginia, United States

This report shows the past weather for Washington Dulles International Airport, providing a weather history for the summer of 2020. It features all historical weather data series we have available, including the Washington Dulles International Airport temperature history for the summer of 2020. You can drill down from year to month and even day level reports by clicking on the graphs.

Washington Dulles International Airport Temperature History in the Summer of 2020

Temperature history in the Summer of 2020 at Washington Dulles International AirportJunJulAug30°F30°F40°F40°F50°F50°F60°F60°F70°F70°F80°F80°F90°F90°F100°F100°FSpringFall
The daily range of reported temperatures (gray bars) and 24-hour highs (red ticks) and lows (blue ticks), placed over the daily average high (faint red line) and low (faint blue line) temperature, with 25th to 75th and 10th to 90th percentile bands.

Hourly Temperature in the Summer of 2020 at Washington Dulles International Airport

Hourly Temperature in the Summer of 2020 at Washington Dulles International AirportJunJulAug12 AM12 AM3 AM3 AM6 AM6 AM9 AM9 AM12 PM12 PM3 PM3 PM6 PM6 PM9 PM9 PM12 AM12 AMSpringFallhotwarmcoolcomfortable
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 hourly reported temperature, color coded into bands. The shaded overlays indicate night and civil twilight.
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Cloud Cover in the Summer of 2020 at Washington Dulles International Airport

Cloud Cover in the Summer of 2020 at Washington Dulles International AirportJunJulAug12 AM12 AM3 AM3 AM6 AM6 AM9 AM9 AM12 PM12 PM3 PM3 PM6 PM6 PM9 PM9 PM12 AM12 AMSpringFall
0% clear 20% mostly clear 40% partly cloudy 60% mostly cloudy 80% overcast 100%
no significant cloudno cloud detectedceiling and visibility ok
The hourly reported cloud coverage, categorized by the percentage of the sky covered by clouds.

Daily Precipitation in the Summer of 2020 at Washington Dulles International Airport

Daily Precipitation in the Summer of 2020 at Washington Dulles International AirportJunJulAug0.0 in0.0 in0.5 in0.5 in1.0 in1.0 in1.5 in1.5 in2.0 in2.0 in2.5 in2.5 in3.0 in3.0 inSpringFall
The daily measured quantity of liquid or liquid-equivalent precipitation.

Snow Depth in the Summer of 2020 at Washington Dulles International Airport

Snow Depth in the Summer of 2020 at Washington Dulles International AirportJunJulAug0.0 in0.0 in0.2 in0.2 in0.4 in0.4 in0.6 in0.6 in0.8 in0.8 in1.0 in1.0 in1.2 in1.2 inSpringFall
The daily measured snow depth, where available.

Observed Weather in the Summer of 2020 at Washington Dulles International Airport

Observed Weather in the Summer of 2020 at Washington Dulles International AirportJunJulAug12 AM12 AM3 AM3 AM6 AM6 AM9 AM9 AM12 PM12 PM3 PM3 PM6 PM6 PM9 PM9 PM12 AM12 AMSpringFall
foghazedrizzlelight rainmoderate rainheavy rainfreezing rainsleetsnow grainslight snowmoderate snowheavy snowhailthunderstorm
The hourly observed weather, color coded by category (in order of severity). If multiple reports are present, the most severe code is shown.
DayObservationsPrecipitationCodes
Tue, Jun 2 Light Rain0.00 in-RA
Thu, Jun 4 Thunderstorm, Thunderstorm with Heavy Rain, Thunderstorm with Light Rain, Light Rain, Mist0.58 inTS, +TSRA, -TSRA, -RA, BR
Fri, Jun 5 Thunderstorm, Thunderstorm with Light Rain, Thunderstorm with Rain, Rain, Light Rain, Mist1.29 inTS, -TSRA, TSRA, RA, -RA, BR
Sat, Jun 6 Fog, MistFG, BR
Wed, Jun 10 Thunderstorm, Thunderstorm with Heavy Rain, Thunderstorm with Light Rain, Light Rain, Haze, Mist0.91 inTS, +TSRA, -TSRA, -RA, HZ, BR
Thu, Jun 11 Thunderstorm with Heavy Rain, Thunderstorm with Light Rain, Light Rain, Mist0.59 in+TSRA, -TSRA, -RA, BR
Wed, Jun 17 Heavy Rain, Rain, Light Rain, Mist0.48 in+RA, RA, -RA, BR
Thu, Jun 18 Light Rain, Light Drizzle, Mist0.03 in-RA, -DZ, BR
Fri, Jun 19 Thunderstorm, Thunderstorm in the Vicinity, Thunderstorm with Light Rain, Thunderstorm with Rain, Heavy Rain, Light Rain, Mist0.31 inTS, VCTS, -TSRA, TSRA, +RA, -RA, BR
Sat, Jun 20 Thunderstorm, Fog, Mist0.00 inTS, FG, BR
Sun, Jun 21 MistBR
Mon, Jun 22 Thunderstorm, Thunderstorm with Heavy Rain, Thunderstorm with Light Rain, Thunderstorm with Rain, Light Rain, Mist0.75 inTS, +TSRA, -TSRA, TSRA, -RA, BR
Tue, Jun 23 Thunderstorm, Fog, Mist0.00 inTS, FG, BR
Thu, Jun 25 Thunderstorm0.00 inTS
Sat, Jun 27 Thunderstorm with Heavy Rain, Thunderstorm with Light Rain, Mist0.27 in+TSRA, -TSRA, BR
Wed, Jul 1 Thunderstorm with Light Rain, Light Rain0.12 in-TSRA, -RA
Sun, Jul 5 Thunderstorm, Thunderstorm with Heavy Rain, Thunderstorm with Rain, Haze, Mist0.55 inTS, +TSRA, TSRA, HZ, BR
Mon, Jul 6 Thunderstorm, Thunderstorm with Light Rain, Mist, Patches of Fog0.01 inTS, -TSRA, BR, BCFG
Tue, Jul 7 Thunderstorm, Thunderstorm with Heavy Rain, Thunderstorm with Light Rain, Light Rain, Mist0.62 inTS, +TSRA, -TSRA, -RA, BR
Fri, Jul 10 Rain, Light Rain, Mist0.12 inRA, -RA, BR
Sat, Jul 11 Rain, Light Rain, Mist0.13 inRA, -RA, BR
Sun, Jul 12 Light Rain0.01 in-RA
Mon, Jul 20 Thunderstorm, Light Rain0.01 inTS, -RA
Tue, Jul 21 Thunderstorm, Thunderstorm with Light Rain, Light Rain0.04 inTS, -TSRA, -RA
Wed, Jul 22 Thunderstorm, Thunderstorm with Heavy Rain, Thunderstorm with Light Rain, Thunderstorm with Rain, Light Rain, Fog, Mist, Patches of Fog1.64 inTS, +TSRA, -TSRA, TSRA, -RA, FG, BR, BCFG
Thu, Jul 23 Thunderstorm, Thunderstorm with Light Rain, Light Rain0.22 inTS, -TSRA, -RA
Fri, Jul 24 Thunderstorm, Thunderstorm with Light Rain, Thunderstorm with Rain, Heavy Rain, Light Rain, Mist0.85 inTS, -TSRA, TSRA, +RA, -RA, BR
Sat, Jul 25 Mist, Shallow FogBR, MIFG
Thu, Jul 30 Thunderstorm, Thunderstorm with Heavy Rain, Thunderstorm with Light Rain, Light Rain, Mist, Shallow Fog0.19 inTS, +TSRA, -TSRA, -RA, BR, MIFG
Fri, Jul 31 Rain, Light Rain, Mist0.33 inRA, -RA, BR
Sat, Aug 1 Mist, Patches of FogBR, BCFG
Mon, Aug 3 Thunderstorm, Thunderstorm with Heavy Rain, Thunderstorm with Light Rain, Thunderstorm with Rain, Rain, Light Rain, Mist0.33 inTS, +TSRA, -TSRA, TSRA, RA, -RA, BR
Tue, Aug 4 Heavy Rain, Rain, Light Rain, Mist1.88 in+RA, RA, -RA, BR
Wed, Aug 5 Light Rain0.00 in-RA
Thu, Aug 6 Thunderstorm, Thunderstorm with Light Rain, Heavy Rain, Light Rain, Mist0.76 inTS, -TSRA, +RA, -RA, BR
Mon, Aug 10 Patches of FogBCFG
Wed, Aug 12 Thunderstorm, Thunderstorm with Light Rain, Thunderstorm with Rain, Light Rain, Mist0.66 inTS, -TSRA, TSRA, -RA, BR
Thu, Aug 13 Thunderstorm, Thunderstorm with Light Rain, Thunderstorm with Rain, Rain, Light Rain, Mist0.44 inTS, -TSRA, TSRA, RA, -RA, BR
Fri, Aug 14 Light Rain0.00 in-RA
Sat, Aug 15 Heavy Rain, Rain, Light Rain, Mist0.38 in+RA, RA, -RA, BR
Sun, Aug 16 Heavy Rain, Rain, Light Rain, Mist0.55 in+RA, RA, -RA, BR
Mon, Aug 17 Mist, Patches of Fog0.00 inBR, BCFG
Wed, Aug 19 Rain, Light Rain, Mist0.17 inRA, -RA, BR
Fri, Aug 21 Light Rain0.00 in-RA
Sat, Aug 22 Thunderstorm, Thunderstorm with Light Rain, Thunderstorm with Rain, Heavy Rain, Light Rain, Mist0.29 inTS, -TSRA, TSRA, +RA, -RA, BR
Sun, Aug 23 Mist, Patches of FogBR, BCFG
Mon, Aug 24 Light Rain, Mist, Shallow Fog0.01 in-RA, BR, MIFG
Tue, Aug 25 Thunderstorm, Thunderstorm with Light Rain, Thunderstorm with Rain, Light Rain, Mist0.08 inTS, -TSRA, TSRA, -RA, BR
Fri, Aug 28 Thunderstorm, Thunderstorm with Heavy Rain, Thunderstorm with Light Rain, Thunderstorm with Rain, Rain, Light Rain, Mist1.11 inTS, +TSRA, -TSRA, TSRA, RA, -RA, BR
Sat, Aug 29 Heavy Rain, Rain, Light Rain, Mist0.39 in+RA, RA, -RA, BR
Mon, Aug 31 Rain, Light Rain, Mist0.55 inRA, -RA, BR

Hours of Daylight and Twilight in the Summer of 2020 at Washington Dulles International Airport

Hours of Daylight and Twilight in the Summer of 2020 at Washington Dulles International AirportJunJulAug0 hr24 hr4 hr20 hr8 hr16 hr12 hr12 hr16 hr8 hr20 hr4 hr24 hr0 hrSpringFallJun 2014 hr, 54 minJun 2014 hr, 54 minnightnightdaydayAug 3113 hr, 3 minAug 3113 hr, 3 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.

Sunrise & Sunset with Twilight in the Summer of 2020 at Washington Dulles International Airport

Sunrise & Sunset with Twilight in the Summer of 2020 at Washington Dulles International AirportJunJulAug2 AM2 AM4 AM4 AM6 AM6 AM8 AM8 AM10 AM10 AM12 PM12 PM2 PM2 PM4 PM4 PM6 PM6 PM8 PM8 PM10 PM10 PM12 AM12 AMSpringFall5:43 AM5:43 AMJun 138:36 PMJun 138:36 PM6:38 AM6:38 AMAug 317:40 PMAug 317:40 PM
The solar day over the course of the Summer of 2020. 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.

Solar Elevation and Azimuth in the Summer of 2020 at Washington Dulles International Airport

Solar Elevation and Azimuth in the Summer of 2020 at Washington Dulles International AirportJunJulAug12 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 AMSpringFall0010202030304050506060700010102030304040506070
northeastsouthwest
Solar elevation and azimuth in the the summer of 2020. 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).

Moon Rise, Set & Phases in the Summer of 2020 at Washington Dulles International Airport

Moon Rise, Set & Phases in the Summer of 2020 at Washington Dulles International AirportJunJulAug12 AM12 AM4 AM4 AM8 AM8 AM12 PM12 PM4 PM4 PM8 PM8 PM12 AM12 AMSpringFallMay 76:46 AMMay 76:46 AMMay 221:39 PMMay 221:39 PMJun 53:13 PMJun 53:13 PMJun 212:42 AMJun 212:42 AMJul 512:45 AMJul 512:45 AMJul 201:33 PMJul 201:33 PMAug 311:59 AMAug 311:59 AMAug 1810:42 PMAug 1810:42 PMSep 21:23 AMSep 21:23 AMSep 177:01 AMSep 177:01 AM7:21 PM7:21 PM6:24 AM6:24 AM8:26 PM8:26 PM8:38 PM8:38 PM6:25 AM6:25 AM9:17 PM9:17 PM8:29 PM8:29 PM6:03 AM6:03 AM8:53 PM8:53 PM8:03 PM8:03 PM5:53 AM5:53 AM5:34 AM5:34 AM8:11 PM8:11 PM7:50 PM7:50 PM6:49 AM6:49 AM6:50 AM6:50 AM7:50 PM7:50 PM
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.

Humidity Comfort Levels in the Summer of 2020 at Washington Dulles International Airport

Humidity Comfort Levels in the Summer of 2020 at Washington Dulles International AirportJunJulAug12 AM12 AM3 AM3 AM6 AM6 AM9 AM9 AM12 PM12 PM3 PM3 PM6 PM6 PM9 PM9 PM12 AM12 AMSpringFall
dry 55°F comfortable 60°F humid 65°F muggy 70°F oppressive 75°F miserable
The hourly reported humidity comfort level, categorized by dew point. The shaded overlays indicate night and civil twilight.

Wind Speed in the Summer of 2020 at Washington Dulles International Airport

Wind Speed in the Summer of 2020 at Washington Dulles International AirportJunJulAug0 mph0 mph10 mph10 mph20 mph20 mph30 mph30 mph40 mph40 mph50 mph50 mphSpringFall
The daily range of reported wind speeds (gray bars), with maximum gust speeds (red ticks).

Hourly Wind Speed in the Summer of 2020 at Washington Dulles International Airport

Hourly Wind Speed in the Summer of 2020 at Washington Dulles International AirportJunJulAug12 AM12 AM3 AM3 AM6 AM6 AM9 AM9 AM12 PM12 PM3 PM3 PM6 PM6 PM9 PM9 PM12 AM12 AMSpringFall
0 mph calm 1 mph light air 4 mph light breeze 8 mph gentle breeze 13 mph moderate breeze 18 mph fresh breeze 25 mph strong breeze 31 mph near gale 39 mph gale 47 mph strong gale 55 mph storm 64 mph violent storm 73 mph hurricane force
The hourly reported wind speed, color coded into bands according to the Beaufort scale. The shaded overlays indicate night and civil twilight.

Hourly Wind Direction in 2020 at Washington Dulles International Airport

Hourly Wind Direction in 2020 at Washington Dulles International AirportJunJulAug12 AM12 AM3 AM3 AM6 AM6 AM9 AM9 AM12 PM12 PM3 PM3 PM6 PM6 PM9 PM9 PM12 AM12 AMSpringFall
calmnortheastsouthwest
The hourly reported wind direction, color coded by compass point. The shaded overlays indicate night and civil twilight.

Atmospheric Pressure in the Summer of 2020 at Washington Dulles International Airport

Atmospheric Pressure in the Summer of 2020 at Washington Dulles International AirportJunJulAug29.4 inHg29.4 inHg29.6 inHg29.6 inHg29.8 inHg29.8 inHg30.0 inHg30.0 inHg30.2 inHg30.2 inHg30.4 inHg30.4 inHg30.6 inHg30.6 inHgSpringFall
The daily range of atmospheric pressure (gray bars), as measured by the altimeter setting reported in e.g. a METAR report.

Number of Reports by Day in the Summer of 2020 at Washington Dulles International Airport 2020

Number of Reports by Day in the Summer of 2020 at Washington Dulles International AirportJunJulAug005050100100SpringFall
regularspecialcorrection
The number of reports per day.

Reports by Hour in the Summer of 2020 at Washington Dulles International Airport 2020

Reports by Hour in the Summer of 2020 at Washington Dulles International AirportJunJulAug12 AM12 AM3 AM3 AM6 AM6 AM9 AM9 AM12 PM12 PM3 PM3 PM6 PM6 PM9 PM9 PM12 AM12 AMSpringFall
regularspecialcorrection
Indication of what types of reports were recorded during each hour.

This report graphically illustrates the historical weather reports recorded by the weather station at Washington Dulles International Airport in the summer of 2020.

METAR Reports

Airport weather stations throughout the world routinely issue METAR weather reports . Such reports are used by pilots, air traffic controllers, meteorologists, climatologists, and other researchers. They are published via radio transmission and on the internet. We have been collecting and archiving published METAR reports since 2011, and have found third-party sources for archived reports from years prior to that.

ISD Reports

The Integrated Surface Database (ISD), maintained and published by NOAA's National Center for Environmental Information , consists of hourly and synoptic weather reports from a variety of sources. We use ISD data to complement and backfill for our METAR archive.

Other Data

The sources for the averages shown in the daily temperature chart are discussed in greater detail on this station's Averages Report.

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.

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.

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