Climate and Average Weather Year Round in Djelfa Algeria
In Djelfa, the summers are short, hot, and mostly clear; the winters are long, very cold, windy, and partly cloudy; and it is dry year round. Over the course of the year, the temperature typically varies from 32°F to 94°F and is rarely below 26°F or above 101°F.
Based on the beach/pool score, the best time of year to visit Djelfa for hot-weather activities is from late June to early September.
Climate in Djelfa
Average Temperature in Djelfa
The hot season lasts for 2.9 months, from June 12 to September 9, with an average daily high temperature above 86°F. The hottest day of the year is July 19, with an average high of 94°F and low of 69°F.
The cool season lasts for 3.8 months, from November 15 to March 10, with an average daily high temperature below 60°F. The coldest day of the year is January 11, with an average low of 32°F and high of 51°F.
Average High and Low Temperature in Djelfa
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 Djelfa
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
Clinton, Arkansas, United States (5,165 miles away); Murfreesboro, Tennessee, United States (4,862 miles); and South Hill, Virginia, United States (4,425 miles) are the far-away foreign places with temperatures most similar to Djelfa (view comparison).
In Djelfa, 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 Djelfa begins around June 13 and lasts for 2.8 months, ending around September 6. On July 30, the clearest day of the year, the sky is clear, mostly clear, or partly cloudy 93% of the time, and overcast or mostly cloudy 7% of the time.
The cloudier part of the year begins around September 6 and lasts for 9.2 months, ending around June 13. On December 14, the cloudiest day of the year, the sky is overcast or mostly cloudy 43% of the time, and clear, mostly clear, or partly cloudy 57% of the time.
Cloud Cover Categories in Djelfa
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 Djelfa varies throughout the year.
The wetter season lasts 9.4 months, from August 21 to June 3, with a greater than 10% chance of a given day being a wet day. The chance of a wet day peaks at 16% on May 6.
The drier season lasts 2.5 months, from June 3 to August 21. The smallest chance of a wet day is 4% on July 21.
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 16% on May 6.
Daily Chance of Precipitation in Djelfa
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. Djelfa experiences some seasonal variation in monthly rainfall.
The rainy period of the year lasts for 9.8 months, from August 18 to June 12, with a sliding 31-day rainfall of at least 0.5 inches. The most rain falls during the 31 days centered around April 27, with an average total accumulation of 1.1 inches.
The rainless period of the year lasts for 2.2 months, from June 12 to August 18. The least rain falls around July 23, with an average total accumulation of 0.2 inches.
Average Monthly Rainfall in Djelfa
The sliding 31-day liquid-equivalent quantity of snowfall in Djelfa 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 in Djelfa
The length of the day in Djelfa varies significantly over the course of the year. In 2021, the shortest day is December 21, with 9 hours, 50 minutes of daylight; the longest day is June 21, with 14 hours, 29 minutes of daylight.
Hours of Daylight and Twilight in Djelfa
The earliest sunrise is at 5:33 AM on June 12, and the latest sunrise is 2 hours, 21 minutes later at 7:54 AM on January 7. The earliest sunset is at 5:35 PM on December 5, and the latest sunset is 2 hours, 28 minutes later at 8:04 PM on June 28.
Daylight saving time (DST) is not observed in Djelfa during 2021.
Sunrise & Sunset with Twilight in Djelfa
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 Djelfa
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 Djelfa, 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 in Djelfa
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 Djelfa experiences significant seasonal variation over the course of the year.
The windier part of the year lasts for 6.6 months, from November 10 to May 28, with average wind speeds of more than 9.8 miles per hour. The windiest day of the year is April 7, with an average hourly wind speed of 11.3 miles per hour.
The calmer time of year lasts for 5.4 months, from May 28 to November 10. The calmest day of the year is August 16, with an average hourly wind speed of 8.3 miles per hour.
Average Wind Speed in Djelfa
The predominant average hourly wind direction in Djelfa varies throughout the year.
The wind is most often from the north for 6.7 months, from February 28 to September 18, with a peak percentage of 39% on June 5. The wind is most often from the south for 1.0 months, from September 18 to October 19, with a peak percentage of 33% on September 20. The wind is most often from the west for 4.3 months, from October 19 to February 28, with a peak percentage of 41% on January 1.
Wind Direction in Djelfa
Best Time of Year to Visit
To characterize how pleasant the weather is in Djelfa 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 times of year to visit Djelfa for general outdoor tourist activities are from early May to late June and from late August to mid October, with a peak score in the first week of June.
Tourism Score in Djelfa
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 Djelfa for hot-weather activities is from late June to early September, with a peak score in the last week of July.
Beach/Pool Score in Djelfa
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 Djelfa typically lasts for 8.3 months (255 days), from around March 15 to around November 25, rarely starting before February 17 or after April 6, and rarely ending before November 3 or after December 17.
Time Spent in Various Temperature Bands and the Growing Season in Djelfa
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 Djelfa should appear around March 7, only rarely appearing before February 21 or after March 23.
Growing Degree Days in Djelfa
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 3.9 months, from April 25 to August 22, with an average daily incident shortwave energy per square meter above 6.9 kWh. The brightest day of the year is July 10, with an average of 7.9 kWh.
The darker period of the year lasts for 3.1 months, from November 2 to February 7, with an average daily incident shortwave energy per square meter below 3.9 kWh. The darkest day of the year is December 18, with an average of 2.8 kWh.
Average Daily Incident Shortwave Solar Energy in Djelfa
For the purposes of this report, the geographical coordinates of Djelfa are 34.673 deg latitude, 3.263 deg longitude, and 3,734 ft elevation.
The topography within 2 miles of Djelfa contains only modest variations in elevation, with a maximum elevation change of 266 feet and an average elevation above sea level of 3,798 feet. Within 10 miles contains only modest variations in elevation (1,670 feet). Within 50 miles contains very significant variations in elevation (3,251 feet).
The area within 2 miles of Djelfa is covered by artificial surfaces (85%), within 10 miles by sparse vegetation (72%) and cropland (14%), and within 50 miles by sparse vegetation (58%) and bare soil (35%).
This report illustrates the typical weather in Djelfa, 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, L'Mekrareg Airport, in our network suitable to be used as a proxy for the historical temperature and dew point records of Djelfa.
At a distance of 106 kilometers from Djelfa, 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 Djelfa 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 © Esri, with data from National Geographic, Esri, DeLorme, NAVTEQ, UNEP-WCMC, USGS, NASA, ESA, METI, NRCAN, GEBCO, NOAA, and iPC.
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.