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Average Weather at Florennes Air Base Belgium

At Florennes Air Base, the summers are short, 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 32°F to 72°F and is rarely below 20°F or above 83°F.

Based on the tourism score, the best time of year to visit Florennes Air Base for warm-weather activities is from late June to late August.

Climate Summary

very coldcoldcoolcomfortablecoolcoldvery coldJanFebMarAprMayJunJulAugSepOctNovDecNowNow58%58%22%22%overcastclearprecipitation: 2.5 inprecipitation: 2.5 in1.5 in1.5 inmuggy: 2%muggy: 2%0%0%drydrytourism score: 6.6tourism score: 6.60.00.0
Click on each chart for more information.

Temperature

The warm season lasts for 2.9 months, from June 12 to September 9, with an average daily high temperature above 65°F. The hottest day of the year is August 4, with an average high of 72°F and low of 56°F.

The cold season lasts for 3.7 months, from November 18 to March 9, with an average daily high temperature below 46°F. The coldest day of the year is February 8, with an average low of 32°F and high of 41°F.

Average High and Low Temperature

Average High and Low Temperature at Florennes Air BasewarmcoldcoldJanFebMarAprMayJunJulAugSepOctNovDec0°F0°F10°F10°F20°F20°F30°F30°F40°F40°F50°F50°F60°F60°F70°F70°F80°F80°F90°F90°F100°F100°FFeb 841°FFeb 841°FAug 472°FAug 472°F32°F32°F56°F56°FJun 1265°FJun 1265°FSep 965°FSep 965°FNov 1846°FNov 1846°FMar 946°FMar 946°F50°F50°F51°F51°F38°F38°F35°F35°FNowNow
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 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

Average Hourly Temperature at Florennes Air BaseJanFebMarAprMayJunJulAugSepOctNovDec12 AM12 AM4 AM4 AM8 AM8 AM12 PM12 PM4 PM4 PM8 PM8 PM12 AM12 AMNowNowvery coldvery coldcoldcoldcoolcomfortable
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.

Clouds

At Florennes Air Base, 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 at Florennes Air Base begins around March 31 and lasts for 6.4 months, ending around October 11. On July 24, the clearest day of the year, the sky is clear, mostly clear, or partly cloudy 58% of the time, and overcast or mostly cloudy 41% of the time.

The cloudier part of the year begins around October 11 and lasts for 5.6 months, ending around March 31. On December 27, the cloudiest day of the year, the sky is overcast or mostly cloudy 78% of the time, and clear, mostly clear, or partly cloudy 22% of the time.

Cloud Cover Categories

Cloud Cover Categories at Florennes Air BaseclearercloudiercloudierJanFebMarAprMayJunJulAugSepOctNovDec0%100%10%90%20%80%30%70%40%60%50%50%60%40%70%30%80%20%90%10%100%0%Jul 2458%Jul 2458%Dec 2722%Dec 2722%Mar 3140%Mar 3140%Oct 1141%Oct 1141%NowNowclearmostly clearpartly cloudyovercastmostly cloudy
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.

Precipitation

A wet day is one with at least 0.04 inches of liquid or liquid-equivalent precipitation. The chance of wet days at Florennes Air Base varies throughout the year.

The wetter season lasts 8.3 months, from May 11 to January 21, with a greater than 30% chance of a given day being a wet day. The chance of a wet day peaks at 36% on December 22.

The drier season lasts 3.7 months, from January 21 to May 11. The smallest chance of a wet day is 25% on April 22.

Among wet days, we distinguish between those that experience rain alone, snow alone, or a mixture of the two. Based on this categorization, the most common form of precipitation throughout the year is rain alone, with a peak probability of 33% on June 12.

Daily Chance of Precipitation

Daily Chance of Precipitation at Florennes Air BasewetwetdryJanFebMarAprMayJunJulAugSepOctNovDec0%0%10%10%20%20%30%30%40%40%50%50%60%60%70%70%80%80%90%90%100%100%Dec 2236%Dec 2236%Apr 2225%Apr 2225%Jan 2130%Jan 2130%NowNowrainmixed
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 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. Florennes Air Base experiences some seasonal variation in monthly rainfall.

Rain falls throughout the year at Florennes Air Base. The most rain falls during the 31 days centered around December 22, with an average total accumulation of 2.3 inches.

The least rain falls around April 20, with an average total accumulation of 1.5 inches.

Average Monthly Rainfall

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 liquid-equivalent snowfall.

Snowfall

The sliding 31-day liquid-equivalent quantity of snowfall at Florennes Air Base does not vary significantly over the course of the year, staying within 0.1 inches of 0.1 inches throughout.

Average Liquid-Equivalent Monthly Snowfall

Average Liquid-Equivalent Monthly Snowfall at Florennes Air BasesnowsnowJanFebMarAprMayJunJulAugSepOctNovDec0.0 in0.0 in0.5 in0.5 in1.0 in1.0 in1.5 in1.5 in2.0 in2.0 in2.5 in2.5 inDec 280.2 inDec 280.2 inAug 20.0 inAug 20.0 inFeb 40.1 inFeb 40.1 inNowNow
The average liquid-equivalent snowfall (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 rainfall.

Sun

The length of the day at Florennes Air Base varies extremely over the course of the year. In 2021, the shortest day is December 21, with 8 hours, 2 minutes of daylight; the longest day is June 21, with 16 hours, 25 minutes of daylight.

Hours of Daylight and Twilight

Hours of Daylight and Twilight at Florennes Air BaseJanFebMarAprMayJunJulAugSepOctNovDec0 hr24 hr4 hr20 hr8 hr16 hr12 hr12 hr16 hr8 hr20 hr4 hr24 hr0 hr12 hr, 7 minMar 2012 hr, 7 minMar 2016 hr, 25 minJun 2116 hr, 25 minJun 2112 hr, 11 minSep 2212 hr, 11 minSep 228 hr, 2 minDec 218 hr, 2 minDec 21nightnightday
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 is at 5:30 AM on June 17, and the latest sunrise is 3 hours, 11 minutes later at 8:41 AM on December 31. The earliest sunset is at 4:38 PM on December 12, and the latest sunset is 5 hours, 18 minutes later at 9:56 PM on June 25.

Daylight saving time (DST) is observed at Florennes Air Base 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

Sunrise & Sunset with Twilight and Daylight Saving Time at Florennes Air BaseJanFebMarAprMayJunJulAugSepOctNovDec2 AM4 AM6 AM8 AM10 AM12 PM2 PM4 PM6 PM8 PM10 PM12 AMJun 175:30 AMJun 175:30 AM9:56 PMJun 259:56 PMJun 25Dec 124:38 PMDec 124:38 PM8:41 AMDec 318:41 AMDec 31Mar 28DSTMar 28DSTDSTOct 31DSTOct 31daynightnightnightnightSolarMidnightSolarMidnightSolarNoonSunsetNowNow
The solar day over the course of the year 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. The transitions to and from daylight saving time are indicated by the 'DST' labels.

Moon

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

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

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 at Florennes Air Base, 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, staying within 1% of 1% throughout.

Humidity Comfort Levels

Humidity Comfort Levels at Florennes Air BaseJanFebMarAprMayJunJulAugSepOctNovDec0%0%10%10%20%20%30%30%40%40%50%50%60%60%70%70%80%80%90%90%100%100%Mar 60%Mar 60%Jul 172%Jul 172%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.

Wind

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 Florennes Air Base experiences significant seasonal variation over the course of the year.

The windier part of the year lasts for 5.8 months, from October 13 to April 7, with average wind speeds of more than 10.4 miles per hour. The windiest day of the year is January 7, with an average hourly wind speed of 12.7 miles per hour.

The calmer time of year lasts for 6.2 months, from April 7 to October 13. The calmest day of the year is August 5, with an average hourly wind speed of 8.1 miles per hour.

Average Wind Speed

Average Wind Speed at Florennes Air BasewindywindyJanFebMarAprMayJunJulAugSepOctNovDec0 mph0 mph2 mph2 mph4 mph4 mph6 mph6 mph8 mph8 mph10 mph10 mph12 mph12 mph14 mph14 mph16 mph16 mph18 mph18 mph20 mph20 mphJan 712.7 mphJan 712.7 mphAug 58.1 mphAug 58.1 mphOct 1310.4 mphOct 1310.4 mphApr 710.4 mphApr 710.4 mphNowNow
The average of mean hourly wind speeds (dark gray line), with 25th to 75th and 10th to 90th percentile bands.

The predominant average hourly wind direction at Florennes Air Base varies throughout the year.

The wind is most often from the west for 3.6 weeks, from March 5 to March 30 and for 4.1 months, from May 13 to September 17, with a peak percentage of 42% on July 11. The wind is most often from the south for 1.5 months, from March 30 to May 13 and for 5.6 months, from September 17 to March 5, with a peak percentage of 30% on April 11.

Wind Direction

Wind Direction at Florennes Air BaseSWSWSJanFebMarAprMayJunJulAugSepOctNovDec0%100%20%80%40%60%60%40%80%20%100%0%NowNowwestsouthnortheast
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).

Best Time of Year to Visit

To characterize how pleasant the weather is at Florennes Air Base 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 Florennes Air Base for general outdoor tourist activities is from late June to late August, with a peak score in the first week of August.

Tourism Score

Tourism Score at Florennes Air Basebest timeJanFebMarAprMayJunJulAugSepOctNovDec002244668810106.66.60.00.0NowNowprecipitationprecipitationcloudscloudstemperaturetemperature tourism score
The tourism score (filled area), and its constituents: the temperature score (red line), the cloud cover score (blue line), and the precipitation score (green line).

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 Florennes Air Base for hot-weather activities is from mid July to mid August, with a peak score in the last week of July.

Beach/Pool Score

Beach/Pool Score at Florennes Air BaseJanFebMarAprMayJunJulAugSepOctNovDec002244668810103.13.10.00.0NowNowprecipitationprecipitationcloudscloudstemperaturetemperature beach/pool score
The beach/pool score (filled area), and its constituents: the temperature score (red line), the cloud cover score (blue line), and the precipitation score (green line).

Methodology

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.

Growing Season

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 Florennes Air Base typically lasts for 6.9 months (210 days), from around April 9 to around November 5, rarely starting before March 18 or after April 28, and rarely ending before October 13 or after December 2.

Time Spent in Various Temperature Bands and the Growing Season

Time Spent in Various Temperature Bands and the Growing Season at Florennes Air Basegrowing seasonJanFebMarAprMayJunJulAugSepOctNovDec0%100%10%90%20%80%30%70%40%60%50%50%60%40%70%30%80%20%90%10%100%0%50%Apr 950%Apr 950%Nov 550%Nov 590%Apr 2890%Apr 2890%Oct 1390%Oct 1310%Mar 1810%Mar 1810%Dec 210%Dec 20%Jan 280%Jan 28Jul 24100%Jul 24100%NowNowvery coldcoldcoolcomfortablefreezingwarm
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.

Based on growing degree days alone, the first spring blooms at Florennes Air Base should appear around April 28, only rarely appearing before April 12 or after May 15.

Growing Degree Days

Growing Degree Days at Florennes Air BaseJanFebMarAprMayJunJulAugSepOctNovDec0°F0°F500°F500°F1,000°F1,000°F1,500°F1,500°F2,000°F2,000°FApr 2890°FApr 2890°FJul 28900°FJul 28900°FDec 311,679°FDec 311,679°FNowNow
The average growing degree days accumulated over the course of the year, with 25th to 75th and 10th to 90th percentile bands.

Solar Energy

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 3.6 months, from May 1 to August 20, with an average daily incident shortwave energy per square meter above 5.2 kWh. The brightest day of the year is June 26, with an average of 6.4 kWh.

The darker period of the year lasts for 3.7 months, from October 28 to February 18, with an average daily incident shortwave energy per square meter below 1.8 kWh. The darkest day of the year is December 23, with an average of 0.6 kWh.

Average Daily Incident Shortwave Solar Energy

Average Daily Incident Shortwave Solar Energy at Florennes Air BasebrightdarkdarkJanFebMarAprMayJunJulAugSepOctNovDec0 kWh0 kWh1 kWh1 kWh2 kWh2 kWh3 kWh3 kWh4 kWh4 kWh5 kWh5 kWh6 kWh6 kWh7 kWh7 kWh8 kWh8 kWh9 kWh9 kWhJun 266.4 kWhJun 266.4 kWhDec 230.6 kWhDec 230.6 kWhMay 15.2 kWhMay 15.2 kWhAug 205.2 kWhAug 205.2 kWhOct 281.8 kWhOct 281.8 kWhFeb 181.8 kWhFeb 181.8 kWhNowNow
The average daily shortwave solar energy reaching the ground per square meter (orange line), with 25th to 75th and 10th to 90th percentile bands.

Topography

For the purposes of this report, the geographical coordinates of Florennes Air Base are 50.243 deg latitude, 4.646 deg longitude, and 892 ft elevation.

The topography within 2 miles of Florennes Air Base contains only modest variations in elevation, with a maximum elevation change of 282 feet and an average elevation above sea level of 922 feet. Within 10 miles contains only modest variations in elevation (768 feet). Within 50 miles contains significant variations in elevation (2,510 feet).

The area within 2 miles of Florennes Air Base is covered by cropland (41%), trees (32%), and artificial surfaces (23%), within 10 miles by cropland (50%) and trees (30%), and within 50 miles by cropland (39%) and trees (27%).

Data Sources

This report illustrates the typical weather at Florennes Air Base, 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

Florennes Air Base 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 Brussels South Charleroi Airport, Charleville-Mézières, Beauvechain Air Base, Brussels Airport, Saint-Ghislain Airport, Sint-Truiden, Saint Hubert, and Saint-Hubert Air Base.

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 © Esri, with data from National Geographic, Esri, DeLorme, NAVTEQ, UNEP-WCMC, USGS, NASA, ESA, METI, NRCAN, GEBCO, NOAA, and iPC.

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.