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April Weather at Saint-Hubert Air Base Belgium

Daily high temperatures increase by 7°F, from 48°F to 55°F, rarely falling below 38°F or exceeding 68°F.

Daily low temperatures increase by 5°F, from 36°F to 41°F, rarely falling below 29°F or exceeding 50°F.

For reference, on August 4, the hottest day of the year, temperatures at Saint-Hubert Air Base typically range from 54°F to 69°F, while on February 8, the coldest day of the year, they range from 29°F to 37°F.

Average High and Low Temperature in April at Saint-Hubert Air Base

Average High and Low Temperature in April at Saint-Hubert Air Base1815222911223344556677889910101111121213131414151516161717181819192020212122222323242425252626272728282929303020°F20°F25°F25°F30°F30°F35°F35°F40°F40°F45°F45°F50°F50°F55°F55°F60°F60°F65°F65°F70°F70°F75°F75°FMarMayApr 148°FApr 148°F36°F36°FApr 3055°FApr 3055°F41°F41°FApr 1151°FApr 1151°F38°F38°FApr 2153°FApr 2153°F39°F39°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 April. 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 April at Saint-Hubert Air Base

Average Hourly Temperature in April at Saint-Hubert Air Base1815222911223344556677889910101111121213131414151516161717181819192020212122222323242425252626272728282929303012 AM12 AM4 AM4 AM8 AM8 AM12 PM12 PM4 PM4 PM8 PM8 PM12 AM12 AMMarMayvery coldcoldcool
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.

Kitimat, Canada (4,774 miles away) is the far-away foreign place with temperatures most similar to Saint-Hubert Air Base (view comparison).

Compare Saint-Hubert Air Base to another city:

Clouds

The month of April at Saint-Hubert Air Base experiences essentially constant cloud cover, with the percentage of time that the sky is overcast or mostly cloudy remaining about 59% throughout the month.

The clearest day of the month is April 21, with clear, mostly clear, or partly cloudy conditions 43% of the time.

For reference, on November 22, the cloudiest day of the year, the chance of overcast or mostly cloudy conditions is 79%, while on July 23, the clearest day of the year, the chance of clear, mostly clear, or partly cloudy skies is 58%.

Cloud Cover Categories in April at Saint-Hubert Air Base

Cloud Cover Categories in April at Saint-Hubert Air Base181522291122334455667788991010111112121313141415151616171718181919202021212222232324242525262627272828292930300%100%10%90%20%80%30%70%40%60%50%50%60%40%70%30%80%20%90%10%100%0%MarMayApr 140%Apr 140%Apr 3042%Apr 3042%Apr 1142%Apr 1142%Apr 2143%Apr 2143%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.

Precipitation

A wet day is one with at least 0.04 inches of liquid or liquid-equivalent precipitation. At Saint-Hubert Air Base, the chance of a wet day over the course of April is essentially constant, remaining around 28% throughout.

For reference, the year's highest daily chance of a wet day is 37% on December 22, and its lowest chance is 26% on April 17.

Over the course of April at Saint-Hubert Air Base, the chance of a day with only rain remains an essentially constant 26% throughout, the chance of a day with mixed snow and rain remains an essentially constant 2% throughout, and the chance of a day with only snow remains an essentially constant 0% throughout.

Probability of Precipitation in April at Saint-Hubert Air Base

Probability of Precipitation in April at Saint-Hubert Air Base181522291122334455667788991010111112121313141415151616171718181919202021212222232324242525262627272828292930300%0%5%5%10%10%15%15%20%20%25%25%30%30%35%35%MarMayApr 1726%Apr 1726%Apr 130%Apr 130%Apr 3028%Apr 3028%mixedrainsnow
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 April at Saint-Hubert Air Base is essentially constant, remaining about 1.8 inches throughout, and rarely exceeding 3.5 inches or falling below 0.5 inches.

Average Monthly Rainfall in April at Saint-Hubert Air Base

Average Monthly Rainfall in April at Saint-Hubert Air Base181522291122334455667788991010111112121313141415151616171718181919202021212222232324242525262627272828292930300.0 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 inMarMayApr 11.8 inApr 11.8 inApr 301.9 inApr 301.9 inApr 111.7 inApr 111.7 inApr 211.7 inApr 211.7 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 liquid-equivalent snowfall.

Sun

Over the course of April at Saint-Hubert Air Base, 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, 44 minutes, implying an average daily increase of 3 minutes, 35 seconds, and weekly increase of 25 minutes, 6 seconds.

The shortest day of the month is April 1, with 12 hours, 56 minutes of daylight and the longest day is April 30, with 14 hours, 40 minutes of daylight.

Hours of Daylight and Twilight in April at Saint-Hubert Air Base

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 at Saint-Hubert Air Base is 7:14 AM on April 1 and the earliest sunrise is 59 minutes earlier at 6:16 AM on April 30.

The earliest sunset is 8:10 PM on April 1 and the latest sunset is 45 minutes later at 8:55 PM on April 30.

Daylight saving time is observed at Saint-Hubert Air Base during 2021, but it neither starts nor ends during April, so the entire month is in daylight saving time.

For reference, on June 21, the longest day of the year, the Sun rises at 5:28 AM and sets 16 hours, 23 minutes later, at 9:51 PM, while on December 21, the shortest day of the year, it rises at 8:34 AM and sets 8 hours, 4 minutes later, at 4:38 PM.

Sunrise & Sunset with Twilight and Daylight Saving Time in April at Saint-Hubert Air Base

Sunrise & Sunset with Twilight and Daylight Saving Time in April at Saint-Hubert Air Base181522291122334455667788991010111112121313141415151616171718181919202021212222232324242525262627272828292930302 AM4 AM6 AM8 AM10 AM12 PM2 PM4 PM6 PM8 PM10 PM12 AMMarMay6:16 AM6:16 AMApr 308:55 PMApr 308:55 PM7:14 AM7:14 AMApr 18:10 PMApr 18:10 PM6:53 AM6:53 AMApr 118:26 PMApr 118:26 PMSolarMidnightSolarMidnightSolarNoonSunriseSunset
The solar day over the course of April. 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.

Moon

The figure below presents a compact representation of key lunar data for April 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. 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 April at Saint-Hubert Air Base

Moon Rise, Set & Phases in April at Saint-Hubert Air Base1815222911223344556677889910101111121213131414151516161717181819192020212122222323242425252626272728282929303012 AM12 AM4 AM4 AM8 AM8 AM12 PM12 PM4 PM4 PM8 PM8 PM12 AM12 AMMarMayMar 1311:22 AMMar 1311:22 AMMar 288:49 PMMar 288:49 PMApr 124:31 AMApr 124:31 AMApr 275:32 AMApr 275:32 AMMay 119:01 PMMay 119:01 PMMay 261:15 PMMay 261:15 PM7:27 AM7:27 AM6:40 PM6:40 PM7:42 PM7:42 PM8:03 AM8:03 AM7:22 AM7:22 AM8:53 PM8:53 PM8:01 PM8:01 PM6:46 AM6:46 AM6:02 AM6:02 AM8:58 PM8:58 PM8:23 PM8:23 PM5:38 AM5:38 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.

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 chance that a given day will be muggy at Saint-Hubert Air Base is essentially constant during April, remaining around 0% throughout.

For reference, on July 13, the muggiest day of the year, there are muggy conditions 0% 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 April at Saint-Hubert Air Base

Humidity Comfort Levels in April at Saint-Hubert Air Base181522291122334455667788991010111112121313141415151616171718181919202021212222232324242525262627272828292930300%0%10%10%20%20%30%30%40%40%50%50%60%60%70%70%80%80%90%90%100%100%MarMayApr 10%Apr 10%Apr 300%Apr 300%Apr 110%Apr 110%Apr 210%Apr 210%drydrycomfortablecomfortable
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 Saint-Hubert Air Base is decreasing during April, decreasing from 10.7 miles per hour to 9.5 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 12.5 miles per hour, while on August 5, the calmest day of the year, the daily average wind speed is 8.1 miles per hour.

Average Wind Speed in April at Saint-Hubert Air Base

The average of mean hourly wind speeds (dark gray line), with 25th to 75th and 10th to 90th percentile bands.

The wind direction at Saint-Hubert Air Base during April is predominantly out of the west from April 1 to April 6, the south from April 6 to April 17 and from April 27 to April 30, the north from April 17 to April 25, and the east from April 25 to April 27.

Wind Direction in April at Saint-Hubert Air Base

Wind Direction in April at Saint-Hubert Air BaseWSNSW181522291122334455667788991010111112121313141415151616171718181919202021212222232324242525262627272828292930300%100%20%80%40%60%60%40%80%20%100%0%MarMaywestsoutheastnorth
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).

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 Saint-Hubert Air Base typically lasts for 6.4 months (197 days), from around April 20 to around November 2, rarely starting before March 31 or after May 10, and rarely ending before October 12 or after November 30.

During April at Saint-Hubert Air Base, the chance that a given day is within the growing season is very rapidly increasing rising from 12% to 74% over the course of the month.

Time Spent in Various Temperature Bands and the Growing Season in April at Saint-Hubert Air Base

Time Spent in Various Temperature Bands and the Growing Season in April at Saint-Hubert Air Basegrowing season181522291122334455667788991010111112121313141415151616171718181919202021212222232324242525262627272828292930300%100%10%90%20%80%30%70%40%60%50%50%60%40%70%30%80%20%90%10%100%0%MarMayApr 112%Apr 112%74%Apr 3074%Apr 30Apr 1129%Apr 1129%53%Apr 2153%Apr 2190%May 1090%May 10freezingvery 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 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 at Saint-Hubert Air Base are gradually increasing during April, increasing by 52°F, from 15°F to 68°F, over the course of the month.

Growing Degree Days in April at Saint-Hubert Air Base

The average growing degree days accumulated over the course of April, 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 at Saint-Hubert Air Base is increasing during April, rising by 1.4 kWh, from 3.8 kWh to 5.2 kWh, over the course of the month.

Average Daily Incident Shortwave Solar Energy in April at Saint-Hubert Air Base

Average Daily Incident Shortwave Solar Energy in April at Saint-Hubert Air Base181522291122334455667788991010111112121313141415151616171718181919202021212222232324242525262627272828292930300 kWh0 kWh1 kWh1 kWh2 kWh2 kWh3 kWh3 kWh4 kWh4 kWh5 kWh5 kWh6 kWh6 kWh7 kWh7 kWh8 kWh8 kWhMarMayApr 13.8 kWhApr 13.8 kWhApr 305.2 kWhApr 305.2 kWhApr 114.3 kWhApr 114.3 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.

Topography

For the purposes of this report, the geographical coordinates of Saint-Hubert Air Base are 50.034 deg latitude, 5.440 deg longitude, and 1,916 ft elevation.

The topography within 2 miles of Saint-Hubert Air Base contains significant variations in elevation, with a maximum elevation change of 528 feet and an average elevation above sea level of 1,759 feet. Within 10 miles contains significant variations in elevation (1,306 feet). Within 50 miles contains very significant variations in elevation (2,234 feet).

The area within 2 miles of Saint-Hubert Air Base is covered by trees (94%), within 10 miles by trees (57%) and cropland (24%), and within 50 miles by trees (39%) and cropland (30%).

Data Sources

This report illustrates the typical weather at Saint-Hubert 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

Saint-Hubert 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 Saint Hubert, Liege, Liège Airport, Spa-La Sauvenière Airport, Sint-Truiden, Florennes Air Base, Charleville-Mézières, and Elsenborn-Butgenbach 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.