Climate and Average Weather Year Round in Luxembourg Luxembourg
In Luxembourg, the summers are comfortable and partly cloudy and the winters are very cold, windy, and mostly cloudy. Over the course of the year, the temperature typically varies from 30°F to 74°F and is rarely below 19°F or above 85°F.
Based on the tourism score, the best time of year to visit Luxembourg for warm-weather activities is from late June to late August.
Climate in Luxembourg
The warm season lasts for 3.1 months, from June 3 to September 8, with an average daily high temperature above 67°F. The hottest month of the year in Luxembourg is July, with an average high of 73°F and low of 57°F.
The cold season lasts for 3.6 months, from November 16 to March 5, with an average daily high temperature below 45°F. The coldest month of the year in Luxembourg is January, with an average low of 31°F and high of 38°F.
Average High and Low Temperature in Luxembourg
The figure below shows you a compact characterization of the entire year of hourly average temperatures. The horizontal axis is the day of the year, 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 Luxembourg
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
In Luxembourg, the average percentage of the sky covered by clouds experiences significant seasonal variation over the course of the year.
The clearer part of the year in Luxembourg begins around March 30 and lasts for 6.3 months, ending around October 8.
The clearest month of the year in Luxembourg is July, during which on average the sky is clear, mostly clear, or partly cloudy 59% of the time.
The cloudier part of the year begins around October 8 and lasts for 5.7 months, ending around March 30.
The cloudiest month of the year in Luxembourg is December, during which on average the sky is overcast or mostly cloudy 75% of the time.
Cloud Cover Categories in Luxembourg
0% clear 20% mostly clear 40% partly cloudy 60% mostly cloudy 80% overcast 100%
A wet day is one with at least 0.04 inches of liquid or liquid-equivalent precipitation. The chance of wet days in Luxembourg varies throughout the year.
The wetter season lasts 8.4 months, from May 8 to January 20, with a greater than 29% chance of a given day being a wet day. The month with the most wet days in Luxembourg is June, with an average of 9.6 days with at least 0.04 inches of precipitation.
The drier season lasts 3.6 months, from January 20 to May 8. The month with the fewest wet days in Luxembourg is February, with an average of 7.1 days with at least 0.04 inches of precipitation.
Among wet days, we distinguish between those that experience rain alone, snow alone, or a mixture of the two. The month with the most days of rain alone in Luxembourg is June, with an average of 9.6 days. Based on this categorization, the most common form of precipitation throughout the year is rain alone, with a peak probability of 35% on May 24.
Daily Chance of Precipitation in Luxembourg
To show variation within the months and not just the monthly totals, we show the rainfall accumulated over a sliding 31-day period centered around each day of the year. Luxembourg experiences some seasonal variation in monthly rainfall.
Rain falls throughout the year in Luxembourg. The month with the most rain in Luxembourg is June, with an average rainfall of 2.2 inches.
The month with the least rain in Luxembourg is February, with an average rainfall of 1.5 inches.
Average Monthly Rainfall in Luxembourg
As with rainfall, we consider the snowfall accumulated over a sliding 31-day period centered around each day of the year. Luxembourg experiences some seasonal variation in monthly snowfall.
The snowy period of the year lasts for 3.0 months, from November 24 to February 23, with a sliding 31-day snowfall of at least 1.0 inches. The month with the most snow in Luxembourg is December, with an average snowfall of 2.3 inches.
The snowless period of the year lasts for 9.0 months, from February 23 to November 24. The least snow falls around August 4, with an average total accumulation of 0.0 inches.
Average Monthly Snowfall in Luxembourg
The length of the day in Luxembourg varies extremely over the course of the year. In 2021, the shortest day is December 21, with 8 hours, 7 minutes of daylight; the longest day is June 21, with 16 hours, 20 minutes of daylight.
Hours of Daylight and Twilight in Luxembourg
The earliest sunrise is at 5:26 AM on June 17, and the latest sunrise is 3 hours, 6 minutes later at 8:32 AM on December 31. The earliest sunset is at 4:34 PM on December 11, and the latest sunset is 5 hours, 13 minutes later at 9:47 PM on June 25.
Daylight saving time (DST) is observed in Luxembourg during 2021, starting in the spring on March 28, lasting 7.1 months, and ending in the fall on October 31.
Sunrise & Sunset with Twilight and Daylight Saving Time in Luxembourg
The figure below presents a compact representation of key lunar data for 2021. 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.
Moon Rise, Set & Phases in Luxembourg
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 perceived humidity level in Luxembourg, as measured by the percentage of time in which the humidity comfort level is muggy, oppressive, or miserable, does not vary significantly over the course of the year, remaining a virtually constant 0% throughout.
Humidity Comfort Levels in Luxembourg
dry 55°F comfortable 60°F humid 65°F muggy 70°F oppressive 75°F miserable
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 Luxembourg experiences significant seasonal variation over the course of the year.
The windier part of the year lasts for 5.8 months, from October 17 to April 10, with average wind speeds of more than 9.6 miles per hour. The windiest month of the year in Luxembourg is January, with an average hourly wind speed of 11.2 miles per hour.
The calmer time of year lasts for 6.2 months, from April 10 to October 17. The calmest month of the year in Luxembourg is August, with an average hourly wind speed of 8.1 miles per hour.
Average Wind Speed in Luxembourg
The predominant average hourly wind direction in Luxembourg varies throughout the year.
The wind is most often from the east for 6.0 days, from April 28 to May 4, with a peak percentage of 28% on April 30. The wind is most often from the west for 5.1 months, from May 4 to October 7 and for 4.6 months, from December 10 to April 28, with a peak percentage of 43% on July 3. The wind is most often from the south for 2.1 months, from October 7 to December 10, with a peak percentage of 37% on October 28.
Wind Direction in Luxembourg
To characterize how pleasant the weather is in Luxembourg throughout the year, we compute two travel scores.
The tourism score favors clear, rainless days with perceived temperatures between 65°F and 80°F. Based on this score, the best time of year to visit Luxembourg for general outdoor tourist activities is from late June to late August, with a peak score in the first week of August.
Tourism Score in Luxembourg
The beach/pool score favors clear, rainless days with perceived temperatures between 75°F and 90°F. Based on this score, the best time of year to visit Luxembourg for hot-weather activities is from mid July to mid August, with a peak score in the last week of July.
Beach/Pool Score in Luxembourg
For each hour between 8:00 AM and 9:00 PM of each day in the analysis period (1980 to 2016), independent scores are computed for perceived temperature, cloud cover, and total precipitation. Those scores are combined into a single hourly composite score, which is then aggregated into days, averaged over all the years in the analysis period, and smoothed.
Our cloud cover score is 10 for fully clear skies, falling linearly to 9 for mostly clear skies, and to 1 for fully overcast skies.
Our precipitation score, which is based on the three-hour precipitation centered on the hour in question, is 10 for no precipitation, falling linearly to 9 for trace precipitation, and to 0 for 0.04 inches of precipitation or more.
Our tourism temperature score is 0 for perceived temperatures below 50°F, rising linearly to 9 for 65°F, to 10 for 75°F, falling linearly to 9 for 80°F, and to 1 for 90°F or hotter.
Our beach/pool temperature score is 0 for perceived temperatures below 65°F, rising linearly to 9 for 75°F, to 10 for 82°F, falling linearly to 9 for 90°F, and to 1 for 100°F or hotter.
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 Luxembourg typically lasts for 7.0 months (212 days), from around April 7 to around November 5, rarely starting before March 14 or after April 29, and rarely ending before October 15 or after November 28.
Time Spent in Various Temperature Bands and the Growing Season in Luxembourg
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
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.
Based on growing degree days alone, the first spring blooms in Luxembourg should appear around April 24, only rarely appearing before April 9 or after May 10.
Growing Degree Days in Luxembourg
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 experiences extreme seasonal variation over the course of the year.
The brighter period of the year lasts for 3.5 months, from May 3 to August 19, with an average daily incident shortwave energy per square meter above 5.4 kWh. The brightest month of the year in Luxembourg is June, with an average of 6.5 kWh.
The darker period of the year lasts for 3.7 months, from October 27 to February 18, with an average daily incident shortwave energy per square meter below 1.9 kWh. The darkest month of the year in Luxembourg is December, with an average of 0.7 kWh.
Average Daily Incident Shortwave Solar Energy in Luxembourg
For the purposes of this report, the geographical coordinates of Luxembourg are 49.750 deg latitude, 6.167 deg longitude, and 0 ft elevation.
The topography within 2 miles of Luxembourg is essentially flat, with a maximum elevation change of 0 feet and an average elevation above sea level of 0 feet. Within 10 miles is also essentially flat (0 feet). Within 50 miles is also essentially flat (0 feet).
The area within 2 miles of Luxembourg is covered by trees (68%) and cropland (25%), within 10 miles by trees (41%) and cropland (29%), and within 50 miles by trees (40%) and cropland (31%).
This report illustrates the typical weather in Luxembourg, based on a statistical analysis of historical hourly weather reports and model reconstructions from January 1, 1980 to December 31, 2016.
The details of the data sources used for this report can be found on the Luxembourg Findel Airport page.
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.