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May Weather in Troisdorf Germany

Daily high temperatures increase by 6°F, from 63°F to 69°F, rarely falling below 51°F or exceeding 80°F.

Daily low temperatures increase by 6°F, from 44°F to 51°F, rarely falling below 36°F or exceeding 58°F.

For reference, on August 3, the hottest day of the year, temperatures in Troisdorf typically range from 57°F to 76°F, while on February 8, the coldest day of the year, they range from 32°F to 43°F.

Average High and Low Temperature in May in Troisdorf

Average High and Low Temperature in May in TroisdorfMay112233445566778899101011111212131314141515161617171818191920202121222223232424252526262727282829293030313130°F30°F35°F35°F40°F40°F45°F45°F50°F50°F55°F55°F60°F60°F65°F65°F70°F70°F75°F75°F80°F80°F85°F85°FAprJunMay 163°FMay 163°F44°F44°FMay 3169°FMay 3169°F51°F51°FMay 1165°FMay 1165°F47°F47°FMay 2167°FMay 2167°F49°F49°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 May. 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 May in Troisdorf

Average Hourly Temperature in May in TroisdorfMay112233445566778899101011111212131314141515161617171818191920202121222223232424252526262727282829293030313112 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 AMAprJunvery coldcoldcoolcomfortable
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.

Coquitlam, Canada (4,922 miles away) is the far-away foreign place with temperatures most similar to Troisdorf (view comparison).

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The month of May in Troisdorf experiences essentially constant cloud cover, with the percentage of time that the sky is overcast or mostly cloudy remaining about 54% throughout the month.

The clearest day of the month is May 29, with clear, mostly clear, or partly cloudy conditions 48% of the time.

For reference, on December 25, the cloudiest day of the year, the chance of overcast or mostly cloudy conditions is 73%, while on July 21, the clearest day of the year, the chance of clear, mostly clear, or partly cloudy skies is 57%.

Cloud Cover Categories in May in Troisdorf

Cloud Cover Categories in May in TroisdorfMay11223344556677889910101111121213131414151516161717181819192020212122222323242425252626272728282929303031310%100%10%90%20%80%30%70%40%60%50%50%60%40%70%30%80%20%90%10%100%0%AprJunMay 145%May 145%May 3148%May 3148%May 1146%May 1146%May 2146%May 2146%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. In Troisdorf, the chance of a wet day over the course of May is gradually increasing, starting the month at 29% and ending it at 32%.

For reference, the year's highest daily chance of a wet day is 35% on December 22, and its lowest chance is 26% on March 3.

Probability of Precipitation in May in Troisdorf

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 May in Troisdorf is gradually increasing, starting the month at 1.8 inches, when it rarely exceeds 3.0 inches or falls below 0.8 inches, and ending the month at 2.2 inches, when it rarely exceeds 3.7 inches or falls below 1.0 inches.

Average Monthly Rainfall in May in Troisdorf

Average Monthly Rainfall in May in TroisdorfMay11223344556677889910101111121213131414151516161717181819192020212122222323242425252626272728282929303031310.0 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 in3.5 in3.5 in4.0 in4.0 inAprJunMay 11.8 inMay 11.8 inMay 312.2 inMay 312.2 inMay 112.0 inMay 112.0 inMay 212.1 inMay 212.1 in
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 May in Troisdorf, the length of the day is rapidly increasing. From the start to the end of the month, the length of the day increases by 1 hour, 23 minutes, implying an average daily increase of 2 minutes, 45 seconds, and weekly increase of 19 minutes, 18 seconds.

The shortest day of the month is May 1, with 14 hours, 49 minutes of daylight and the longest day is May 31, with 16 hours, 11 minutes of daylight.

Hours of Daylight and Twilight in May in Troisdorf

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 latest sunrise of the month in Troisdorf is 6:04 AM on May 1 and the earliest sunrise is 41 minutes earlier at 5:23 AM on May 31.

The earliest sunset is 8:53 PM on May 1 and the latest sunset is 42 minutes later at 9:35 PM on May 31.

Daylight saving time is observed in Troisdorf during 2024, but it neither starts nor ends during May, so the entire month is in standard time.

For reference, on June 20, the longest day of the year, the Sun rises at 5:17 AM and sets 16 hours, 31 minutes later, at 9:48 PM, while on December 21, the shortest day of the year, it rises at 8:31 AM and sets 7 hours, 57 minutes later, at 4:28 PM.

Sunrise & Sunset with Twilight in May in Troisdorf

The solar day over the course of May. 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 May in Troisdorf

Solar Elevation and Azimuth in May in TroisdorfMay112233445566778899101011111212131314141515161617171818191920202121222223232424252526262727282829293030313112 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 AMAprJun00101020202030304040505060000101020203030304040505060
northeastsouthwest
Solar elevation and azimuth over the course of May 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 May 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 May in Troisdorf

Moon Rise, Set & Phases in May in TroisdorfMay112233445566778899101011111212131314141515161617171818191920202121222223232424252526262727282829293030313112 AM12 AM4 AM4 AM8 AM8 AM12 PM12 PM4 PM4 PM8 PM8 PM12 AM12 AMAprJunApr 88:22 PMApr 88:22 PMApr 241:50 AMApr 241:50 AMMay 85:23 AMMay 85:23 AMMay 233:54 PMMay 233:54 PMJun 62:38 PMJun 62:38 PMJun 223:09 AMJun 223:09 AM6:45 AM6:45 AM8:11 PM8:11 PM8:25 PM8:25 PM6:15 AM6:15 AM5:39 AM5:39 AM10:09 PM10:09 PM9:59 PM9:59 PM5:25 AM5:25 AM4:35 AM4:35 AM10:27 PM10:27 PM10:06 PM10:06 PM4:51 AM4:51 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 2024IlluminationMoonriseMoonsetMoonriseMeridian PassingDistance
1
50%3:41 AMSE11:50 AMSW-7:45 AMS232,721 mi
2
41%4:04 AMESE1:17 PMWSW-8:40 AMS230,341 mi
3
30%4:22 AMESE2:45 PMWSW-9:32 AMS228,257 mi
4
19%4:36 AME4:12 PMW-10:22 AMS226,670 mi
5
10%4:50 AME5:39 PMW-11:11 AMS225,784 mi
6
4%5:04 AMENE7:08 PMWNW-12:00 PMS225,769 mi
7
1%5:19 AMENE8:38 PMWNW-12:51 PMS226,719 mi
8
0%5:39 AMENE10:09 PMNW-1:46 PMS228,621 mi
9
3%6:05 AMNE11:35 PMNW-2:43 PMS231,348 mi
10
8%6:42 AMNE--3:42 PMS234,665 mi
11
15%-12:49 AMNW7:32 AMNE4:40 PMS238,275 mi
12
23%-1:45 AMNW8:36 AMNE5:36 PMS241,857 mi
13
33%-2:25 AMNW9:49 AMNE6:28 PMS245,122 mi
14
43%-2:52 AMNW11:05 AMNE7:15 PMS247,837 mi
15
50%-3:12 AMWNW12:20 PMENE7:59 PMS249,840 mi
16
62%-3:27 AMWNW1:32 PMENE8:40 PMS251,044 mi
17
71%-3:39 AMWNW2:41 PME9:19 PMS251,431 mi
18
80%-3:49 AMW3:50 PME9:57 PMS251,047 mi
19
87%-3:59 AMW4:59 PME10:36 PMS249,986 mi
20
93%-4:10 AMWSW6:10 PMESE11:17 PMS248,380 mi
21
95%-4:22 AMWSW7:24 PMESE--
22
97%-4:37 AMWSW8:41 PMSE12:01 AMS246,381 mi
23
100%-4:57 AMSW9:59 PMSE12:49 AMS244,145 mi
24
100%-5:25 AMSW11:14 PMSE1:42 AMS241,819 mi
25
98%-6:06 AMSW-2:40 AMS239,525 mi
26
93%12:18 AMSE7:03 AMSW-3:40 AMS237,356 mi
27
86%1:08 AMSE8:15 AMSW-4:41 AMS235,367 mi
28
78%1:44 AMSE9:38 AMSW-5:40 AMS233,585 mi
29
67%2:09 AMESE11:04 AMWSW-6:36 AMS232,023 mi
30
50%2:28 AMESE12:30 PMWSW-7:28 AMS230,701 mi
31
44%2:43 AMESE1:55 PMW-8:17 AMS229,661 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 in Troisdorf is essentially constant during May, remaining around 0% throughout.

For reference, on July 13, the muggiest day of the year, there are muggy conditions 2% 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 May in Troisdorf

Humidity Comfort Levels in May in TroisdorfMay11223344556677889910101111121213131414151516161717181819192020212122222323242425252626272728282929303031310%0%10%10%20%20%30%30%40%40%50%50%60%60%70%70%80%80%90%90%100%100%AprJunMay 10%May 10%May 310%May 310%May 110%May 110%May 210%May 210%humidhumidcomfortablecomfortabledrydry
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 in Troisdorf is gradually decreasing during May, decreasing from 9.0 miles per hour to 8.5 miles per hour over the course of the month.

For reference, on January 17, the windiest day of the year, the daily average wind speed is 12.3 miles per hour, while on August 4, the calmest day of the year, the daily average wind speed is 8.1 miles per hour.

The lowest daily average wind speed during May is 8.4 miles per hour on May 30.

Average Wind Speed in May in Troisdorf

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 Troisdorf throughout May is predominantly from the west, with a peak proportion of 36% on May 31.

Wind Direction in May in Troisdorf

Wind Direction in May in TroisdorfMay11223344556677889910101111121213131414151516161717181819192020212122222323242425252626272728282929303031310%100%20%80%40%60%60%40%80%20%100%0%AprJunwestsoutheastnorth
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 in Troisdorf typically lasts for 6.6 months (201 days), from around April 18 to around November 5, rarely starting before March 31 or after May 6, and rarely ending before October 13 or after December 4.

The month of May in Troisdorf is more likely than not fully within the growing season, with the chance that a given day is in the growing season increasing from 82% to 100% over the course of the month.

Time Spent in Various Temperature Bands and the Growing Season in May in Troisdorf

Time Spent in Various Temperature Bands and the Growing Season in May in Troisdorfgrowing seasonMay11223344556677889910101111121213131414151516161717181819192020212122222323242425252626272728282929303031310%100%10%90%20%80%30%70%40%60%50%50%60%40%70%30%80%20%90%10%100%0%AprJun82%May 182%May 1100%May 31100%May 3195%May 1195%May 11100%May 21100%May 2150%Apr 1850%Apr 18very coldcoldcoolcomfortablewarmfreezing
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 in Troisdorf are increasing during May, increasing by 257°F, from 178°F to 435°F, over the course of the month.

Growing Degree Days in May in Troisdorf

Growing Degree Days in May in TroisdorfMay1122334455667788991010111112121313141415151616171718181919202021212222232324242525262627272828292930303131150°F150°F200°F200°F250°F250°F300°F300°F350°F350°F400°F400°F450°F450°F500°F500°F550°F550°FAprJunMay 1178°FMay 1178°FMay 31435°FMay 31435°FMay 11249°FMay 11249°FMay 21335°FMay 21335°F
The average growing degree days accumulated over the course of May, 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 in Troisdorf is gradually increasing during May, rising by 0.8 kWh, from 5.3 kWh to 6.2 kWh, over the course of the month.

Average Daily Incident Shortwave Solar Energy in May in Troisdorf

Average Daily Incident Shortwave Solar Energy in May in TroisdorfMay11223344556677889910101111121213131414151516161717181819192020212122222323242425252626272728282929303031310 kWh0 kWh1 kWh1 kWh2 kWh2 kWh3 kWh3 kWh4 kWh4 kWh5 kWh5 kWh6 kWh6 kWh7 kWh7 kWh8 kWh8 kWhAprJunMay 15.3 kWhMay 15.3 kWhMay 316.2 kWhMay 316.2 kWhMay 115.7 kWhMay 115.7 kWhMay 215.9 kWhMay 215.9 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 Troisdorf are 50.809 deg latitude, 7.150 deg longitude, and 180 ft elevation.

The topography within 2 miles of Troisdorf contains only modest variations in elevation, with a maximum elevation change of 305 feet and an average elevation above sea level of 213 feet. Within 10 miles contains only modest variations in elevation (1,371 feet). Within 50 miles contains very significant variations in elevation (3,097 feet).

The area within 2 miles of Troisdorf is covered by artificial surfaces (57%), cropland (16%), trees (15%), and grassland (12%), within 10 miles by cropland (32%) and artificial surfaces (32%), and within 50 miles by trees (35%) and cropland (31%).

This report illustrates the typical weather in Troisdorf, 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 Troisdorf.

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

The stations contributing to this reconstruction are:

To get a sense of how much these sources agree with each other, you can view a comparison of Troisdorf and the stations that contribute to our estimates of its temperature history and climate. Please note that each source's contribution is adjusted for elevation and the relative change present in the MERRA-2 data.

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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