May 2021 Weather History at Ronald Reagan Washington National Airport Virginia, United States

This report shows the past weather for Ronald Reagan Washington National Airport, providing a weather history for May 2021. It features all historical weather data series we have available, including the Ronald Reagan Washington National Airport temperature history for May 2021. You can drill down from year to month and even day level reports by clicking on the graphs.

Ronald Reagan Washington National Airport Temperature History May 2021

Temperature history in May 2021 at Ronald Reagan Washington National Airport18152229112233445566778899101011111212131314141515161617171818191920202121222223232424252526262727282829293030313140°F40°F45°F45°F50°F50°F55°F55°F60°F60°F65°F65°F70°F70°F75°F75°F80°F80°F85°F85°F90°F90°F95°F95°FAprJun
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 May 2021 at Ronald Reagan Washington National Airport

Hourly Temperature in May 2021 at Ronald Reagan Washington National Airport18152229112233445566778899101011111212131314141515161617171818191920202121222223232424252526262727282829293030313112 AM12 AM3 AM3 AM6 AM6 AM9 AM9 AM12 PM12 PM3 PM3 PM6 PM6 PM9 PM9 PM12 AM12 AMAprJuncoldcoolwarmhotcomfortable
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 May 2021 at Ronald Reagan Washington National Airport

Cloud Cover in May 2021 at Ronald Reagan Washington National Airport18152229112233445566778899101011111212131314141515161617171818191920202121222223232424252526262727282829293030313112 AM12 AM3 AM3 AM6 AM6 AM9 AM9 AM12 PM12 PM3 PM3 PM6 PM6 PM9 PM9 PM12 AM12 AMAprJun
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 May 2021 at Ronald Reagan Washington National Airport

Daily Precipitation in May 2021 at Ronald Reagan Washington National Airport1815222911223344556677889910101111121213131414151516161717181819192020212122222323242425252626272728282929303031310.0 in0.0 in0.5 in0.5 in1.0 in1.0 in1.5 in1.5 in2.0 in2.0 in2.5 in2.5 inAprJun
The daily measured quantity of liquid or liquid-equivalent precipitation.

Snow Depth in May 2021 at Ronald Reagan Washington National Airport

Snow Depth in May 2021 at Ronald Reagan Washington National Airport1815222911223344556677889910101111121213131414151516161717181819192020212122222323242425252626272728282929303031310.0 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 inAprJun
The daily measured snow depth, where available.

Observed Weather in May 2021 at Ronald Reagan Washington National Airport

Observed Weather in May 2021 at Ronald Reagan Washington National Airport18152229112233445566778899101011111212131314141515161617171818191920202121222223232424252526262727282829293030313112 AM12 AM3 AM3 AM6 AM6 AM9 AM9 AM12 PM12 PM3 PM3 PM6 PM6 PM9 PM9 PM12 AM12 AMAprJun
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
Mon, May 3 Light Rain0.04 in-RA, IWC61, IWCA61
Tue, May 4 Heavy Thunderstorm with Showers, Thunderstorm, Thunderstorm with Rain, Thunderstorm with Showers, Thunderstorm without Precipitation, Heavy Rain, Rain, Light Rain0.50 inIWCA95, IWCA90, TS, TSRA, IWCA92, IWCA91, IWC65, IWCA62, IWC61, IWCA61, -RA
Wed, May 5 Heavy Rain, Rain, Light Rain, Mist0.06 inIWC65, IWCA62, RA, IWC61, IWCA61, -RA, IWCA10, BR
Fri, May 7 Thunderstorm in the Vicinity, Light Rain0.05 inVCTS, -RA
Sat, May 8 Light Rain0.04 in-RA
Mon, May 10 Light Rain0.00 in-RA
Sun, May 16 Light Rain0.00 in-RA
Tue, May 18 HazeHZ
Wed, May 19 HazeHZ
Mon, May 24 Heavy Rain, Rain, Light Rain0.34 in+RA, RA, -RA
Wed, May 26 Thunderstorm, Thunderstorm in the Vicinity, Thunderstorm with Heavy Rain, Thunderstorm with Light Rain, Thunderstorm with Rain, Light Rain, Mist0.90 inTS, VCTS, +TSRA, -TSRA, TSRA, -RA, BR
Fri, May 28 Thunderstorm in the Vicinity, Thunderstorm with Heavy Rain, Thunderstorm with Light Rain, Heavy Rain, Rain, Light Rain, Mist1.16 inVCTS, +TSRA, -TSRA, +RA, RA, -RA, BR
Sat, May 29 Heavy Rain, Rain, Light Rain, Light Drizzle, Mist0.53 in+RA, RA, -RA, -DZ, BR
Sun, May 30 Light Rain0.15 in-RA

Hours of Daylight and Twilight in May 2021 at Ronald Reagan Washington National Airport

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 May 2021 at Ronald Reagan Washington National Airport

Sunrise & Sunset with Twilight in May 2021 at Ronald Reagan Washington National Airport1815222911223344556677889910101111121213131414151516161717181819192020212122222323242425252626272728282929303031312 AM2 AM4 AM4 AM6 AM6 AM8 AM8 AM10 AM10 AM12 PM12 PM2 PM2 PM4 PM4 PM6 PM6 PM8 PM8 PM10 PM10 PM12 AM12 AMAprJun5:45 AM5:45 AMMay 318:27 PMMay 318:27 PM6:10 AM6:10 AMMay 18:00 PMMay 18:00 PM5:59 AM5:59 AMMay 118:10 PMMay 118:10 PM5:50 AM5:50 AMMay 218:19 PMMay 218:19 PM
The solar day over the course of May 2021. 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 May 2021 at Ronald Reagan Washington National Airport

Solar Elevation and Azimuth in May 2021 at Ronald Reagan Washington National AirportMay112233445566778899101011111212131314141515161617171818191920202121222223232424252526262727282829293030313112 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 AMAprJun00101020203030404050506060700010102020303040405050606070
northeastsouthwest
Solar elevation and azimuth over the course of May 2021. 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 May 2021 at Ronald Reagan Washington National Airport

Moon Rise, Set & Phases in May 2021 at Ronald Reagan Washington National Airport18152229112233445566778899101011111212131314141515161617171818191920202121222223232424252526262727282829293030313112 AM12 AM4 AM4 AM8 AM8 AM12 PM12 PM4 PM4 PM8 PM8 PM12 AM12 AMAprJunApr 2611:32 PMApr 2611:32 PMMay 113:01 PMMay 113:01 PMMay 267:15 AMMay 267:15 AM7:34 PM7:34 PM6:43 AM6:43 AM6:01 AM6:01 AM8:13 PM8:13 PM7:40 PM7:40 PM5:52 AM5:52 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.
May 2021IlluminationMoonriseMoonsetMoonriseMeridian PassingDistance
1
76%12:34 AMESE9:55 AMWSW-5:15 AMS229,340 mi
2
65%1:32 AMESE11:00 AMWSW-6:16 AMS232,996 mi
3
50%2:20 AMESE12:07 PMWSW-7:14 AMS236,750 mi
4
43%2:59 AMESE1:13 PMWSW-8:06 AMS240,336 mi
5
33%3:32 AMESE2:17 PMWSW-8:54 AMS243,566 mi
6
23%4:00 AMESE3:19 PMW-9:39 AMS246,329 mi
7
15%4:25 AME4:19 PMW-10:21 AMS248,575 mi
8
9%4:48 AME5:17 PMW-11:01 AMS250,300 mi
9
4%5:11 AME6:15 PMW-11:41 AMS251,525 mi
10
1%5:35 AMENE7:14 PMWNW-12:22 PMS252,279 mi
11
0%6:01 AMENE8:13 PMWNW-1:04 PMS252,585 mi
12
1%6:30 AMENE9:13 PMWNW-1:48 PMS252,451 mi
13
3%7:03 AMENE10:12 PMWNW-2:35 PMS251,864 mi
14
8%7:42 AMENE11:08 PMWNW-3:24 PMS250,798 mi
15
14%8:28 AMENE--4:14 PMS249,218 mi
16
22%-12:01 AMWNW9:20 AMENE5:06 PMS247,100 mi
17
31%-12:49 AMWNW10:18 AMENE5:57 PMS244,444 mi
18
41%-1:31 AMWNW11:20 AMENE6:47 PMS241,297 mi
19
50%-2:07 AMWNW12:26 PMENE7:36 PMS237,763 mi
20
63%-2:40 AMWNW1:33 PMENE8:24 PMS234,018 mi
21
74%-3:09 AMWNW2:42 PME9:12 PMS230,307 mi
22
84%-3:38 AMW3:53 PME10:01 PMS226,936 mi
23
92%-4:06 AMW5:06 PME10:52 PMS224,240 mi
24
97%-4:37 AMWSW6:22 PMESE11:47 PMS222,529 mi
25
99%-5:11 AMWSW7:40 PMESE--
26
100%-5:52 AMWSW8:58 PMESE12:46 AMS222,032 mi
27
99%-6:40 AMWSW10:13 PMESE1:49 AMS222,842 mi
28
95%-7:37 AMWSW11:18 PMESE2:55 AMS224,885 mi
29
88%-8:42 AMWSW-4:00 AMS227,928 mi
30
80%12:13 AMESE9:51 AMWSW-5:02 AMS231,635 mi
31
69%12:57 AMESE11:00 AMWSW-5:59 AMS235,633 mi

Humidity Comfort Levels in May 2021 at Ronald Reagan Washington National Airport

Humidity Comfort Levels in May 2021 at Ronald Reagan Washington National Airport18152229112233445566778899101011111212131314141515161617171818191920202121222223232424252526262727282829293030313112 AM12 AM3 AM3 AM6 AM6 AM9 AM9 AM12 PM12 PM3 PM3 PM6 PM6 PM9 PM9 PM12 AM12 AMAprJun
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 May 2021 at Ronald Reagan Washington National Airport

Wind Speed in May 2021 at Ronald Reagan Washington National Airport1815222911223344556677889910101111121213131414151516161717181819192020212122222323242425252626272728282929303031310 mph0 mph10 mph10 mph20 mph20 mph30 mph30 mph40 mph40 mph50 mph50 mph60 mph60 mphAprJun
The daily range of reported wind speeds (gray bars), with maximum gust speeds (red ticks).

Hourly Wind Speed in May 2021 at Ronald Reagan Washington National Airport

Hourly Wind Speed in May 2021 at Ronald Reagan Washington National Airport18152229112233445566778899101011111212131314141515161617171818191920202121222223232424252526262727282829293030313112 AM12 AM3 AM3 AM6 AM6 AM9 AM9 AM12 PM12 PM3 PM3 PM6 PM6 PM9 PM9 PM12 AM12 AMAprJun
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 2021 at Ronald Reagan Washington National Airport

Hourly Wind Direction in 2021 at Ronald Reagan Washington National Airport18152229112233445566778899101011111212131314141515161617171818191920202121222223232424252526262727282829293030313112 AM12 AM3 AM3 AM6 AM6 AM9 AM9 AM12 PM12 PM3 PM3 PM6 PM6 PM9 PM9 PM12 AM12 AMAprJun
calmnortheastsouthwest
The hourly reported wind direction, color coded by compass point. The shaded overlays indicate night and civil twilight.

Atmospheric Pressure in May 2021 at Ronald Reagan Washington National Airport

Atmospheric Pressure in May 2021 at Ronald Reagan Washington National Airport18152229112233445566778899101011111212131314141515161617171818191920202121222223232424252526262727282829293030313129.4 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 inHgAprJun
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 May 2021 at Ronald Reagan Washington National Airport Spring 2021

Number of Reports by Day in May 2021 at Ronald Reagan Washington National Airport181522291122334455667788991010111112121313141415151616171718181919202021212222232324242525262627272828292930303131005050100100150150AprJun
regularspecialcorrection
The number of reports per day.

Reports by Hour in May 2021 at Ronald Reagan Washington National Airport Spring 2021

Reports by Hour in May 2021 at Ronald Reagan Washington National Airport18152229112233445566778899101011111212131314141515161617171818191920202121222223232424252526262727282829293030313112 AM12 AM3 AM3 AM6 AM6 AM9 AM9 AM12 PM12 PM3 PM3 PM6 PM6 PM9 PM9 PM12 AM12 AMAprJun
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 Ronald Reagan Washington National Airport in May 2021.

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.

Disclaimer

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