Climate and Average Weather Year Round in Bilma Niger
In Bilma, the summers are long, sweltering, and arid; the winters are short, cool, and dry; and it is mostly clear year round. Over the course of the year, the temperature typically varies from 48°F to 108°F and is rarely below 40°F or above 112°F.
Based on the beach/pool score, the best times of year to visit Bilma for hot-weather activities are from early March to late April and from late September to early November.
Climate in Bilma
The hot season lasts for 5.4 months, from April 18 to September 30, with an average daily high temperature above 102°F. The hottest month of the year in Bilma is June, with an average high of 108°F and low of 79°F.
The cool season lasts for 2.3 months, from December 4 to February 13, with an average daily high temperature below 83°F. The coldest month of the year in Bilma is January, with an average low of 49°F and high of 78°F.
Average High and Low Temperature in Bilma
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 Bilma
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 Bilma, the average percentage of the sky covered by clouds experiences mild seasonal variation over the course of the year.
The clearer part of the year in Bilma begins around May 4 and lasts for 2.3 months, ending around July 13.
The clearest month of the year in Bilma is June, during which on average the sky is clear, mostly clear, or partly cloudy 86% of the time.
The cloudier part of the year begins around July 13 and lasts for 9.7 months, ending around May 4.
The cloudiest month of the year in Bilma is December, during which on average the sky is overcast or mostly cloudy 28% of the time.
Cloud Cover Categories in Bilma
0% clear 20% mostly clear 40% partly cloudy 60% mostly cloudy 80% overcast 100%
Bilma does not experience significant seasonal variation in the frequency of wet days (i.e., those with greater than 0.04 inches of liquid or liquid-equivalent precipitation). The frequency ranges from -0% to 2%, with an average value of 0%.
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 Bilma is August, with an average of 0.5 days. Based on this categorization, the most common form of precipitation throughout the year is rain alone, with a peak probability of 2% on August 14.
Daily Chance of Precipitation in Bilma
The sliding 31-day quantity of rainfall in Bilma does not vary significantly over the course of the year, staying within 0.0 inches of 0.0 inches throughout.
Average Monthly Rainfall in Bilma
The length of the day in Bilma varies over the course of the year. In 2023, the shortest day is December 22, with 11 hours, 1 minute of daylight; the longest day is June 21, with 13 hours, 15 minutes of daylight.
Hours of Daylight and Twilight in Bilma
The earliest sunrise is at 5:30 AM on June 6, and the latest sunrise is 1 hour, 13 minutes later at 6:43 AM on January 18. The earliest sunset is at 5:29 PM on November 24, and the latest sunset is 1 hour, 20 minutes later at 6:49 PM on July 6.
Daylight saving time (DST) is not observed in Bilma during 2023.
Sunrise & Sunset with Twilight in Bilma
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 Bilma
The figure below presents a compact representation of key lunar data for 2023. 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 Bilma
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 Bilma, 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 2% of 2% throughout.
Humidity Comfort Levels in Bilma
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 Bilma experiences mild seasonal variation over the course of the year.
The windier part of the year lasts for 4.6 months, from December 13 to May 1, with average wind speeds of more than 8.2 miles per hour. The windiest month of the year in Bilma is March, with an average hourly wind speed of 9.1 miles per hour.
The calmer time of year lasts for 7.4 months, from May 1 to December 13. The calmest month of the year in Bilma is June, with an average hourly wind speed of 7.3 miles per hour.
Average Wind Speed in Bilma
The predominant average hourly wind direction in Bilma varies throughout the year.
The wind is most often from the east for 3.5 months, from March 26 to July 12 and for 3.6 months, from August 28 to December 17, with a peak percentage of 66% on October 6. The wind is most often from the south for 1.5 months, from July 12 to August 28, with a peak percentage of 41% on August 14. The wind is most often from the north for 3.3 months, from December 17 to March 26, with a peak percentage of 54% on January 1.
Wind Direction in Bilma
To characterize how pleasant the weather is in Bilma 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 Bilma for general outdoor tourist activities is from early November to mid March, with a peak score in the second week of February.
Tourism Score in Bilma
The beach/pool score favors clear, rainless days with perceived temperatures between 75°F and 90°F. Based on this score, the best times of year to visit Bilma for hot-weather activities are from early March to late April and from late September to early November, with a peak score in the third week of October.
Beach/Pool Score in Bilma
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).
Temperatures in Bilma are sufficiently warm year round that it is not entirely meaningful to discuss the growing season in these terms. We nevertheless include the chart below as an illustration of the distribution of temperatures experienced throughout the year.
Time Spent in Various Temperature Bands and the Growing Season in Bilma
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.
Growing Degree Days in Bilma
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 some seasonal variation over the course of the year.
The brighter period of the year lasts for 5.1 months, from March 21 to August 24, with an average daily incident shortwave energy per square meter above 7.1 kWh. The brightest month of the year in Bilma is June, with an average of 7.6 kWh.
The darker period of the year lasts for 2.2 months, from November 18 to January 24, with an average daily incident shortwave energy per square meter below 5.7 kWh. The darkest month of the year in Bilma is December, with an average of 5.2 kWh.
Average Daily Incident Shortwave Solar Energy in Bilma
For the purposes of this report, the geographical coordinates of Bilma are 18.685 deg latitude, 12.916 deg longitude, and 1,168 ft elevation.
The topography within 2 miles of Bilma contains only modest variations in elevation, with a maximum elevation change of 249 feet and an average elevation above sea level of 1,177 feet. Within 10 miles contains only modest variations in elevation (659 feet). Within 50 miles also contains significant variations in elevation (758 feet).
The area within 2 miles of Bilma is covered by bare soil (95%), within 10 miles by bare soil (100%), and within 50 miles by bare soil (100%).
This report illustrates the typical weather in Bilma, 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 is only a single weather station, Bilma, in our network suitable to be used as a proxy for the historical temperature and dew point records of Bilma.
At a distance of 0 kilometers from Bilma, closer than our threshold of 150 kilometers, this station is deemed sufficiently nearby to be relied upon as our primary source for temperature and dew point records.
The station records are corrected for the elevation difference between the station and Bilma according to the International Standard Atmosphere , and by the relative change present in the MERRA-2 satellite-era reanalysis between the two locations.
Please note that the station records themselves may additionally have been back-filled using other nearby stations or the MERRA-2 reanalysis.
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.
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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