April Weather in Siwa Oasis Egypt

Daily high temperatures increase by 8°F, from 80°F to 88°F, rarely falling below 72°F or exceeding 98°F.

Daily low temperatures increase by 7°F, from 53°F to 60°F, rarely falling below 47°F or exceeding 68°F.

For reference, on July 30, the hottest day of the year, temperatures in Siwa Oasis typically range from 73°F to 100°F, while on January 29, the coldest day of the year, they range from 44°F to 65°F.

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.

Desert Hot Springs, United States (7,425 miles away) and Tucson, United States (7,329 miles) are the far-away foreign places with temperatures most similar to Siwa Oasis (view comparison).

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The month of April in Siwa Oasis experiences gradually increasing cloud cover, with the percentage of time that the sky is overcast or mostly cloudy increasing from 18% to 24%. The highest chance of overcast or mostly cloudy conditions is 24% on April 30.

The clearest day of the month is April 1, with clear, mostly clear, or partly cloudy conditions 82% of the time.

For reference, on November 30, the cloudiest day of the year, the chance of overcast or mostly cloudy conditions is 27%, while on June 26, the clearest day of the year, the chance of clear, mostly clear, or partly cloudy skies is 100%.

Over the course of April in Siwa Oasis, the length of the day is increasing. From the start to the end of the month, the length of the day increases by 48 minutes, implying an average daily increase of 1 minute, 39 seconds, and weekly increase of 11 minutes, 31 seconds.

The shortest day of the month is April 1, with 12 hours, 29 minutes of daylight and the longest day is April 30, with 13 hours, 17 minutes of daylight.

The earliest sunrise of the month in Siwa Oasis is 5:41 AM on April 25 and the latest sunrise is 59 minutes later at 6:40 AM on April 26.

The earliest sunset is 6:36 PM on April 1 and the latest sunset is 1 hour, 17 minutes later at 7:53 PM on April 30.

Daylight saving time (DST) ends at 1:00 AM on April 26, 2024, shifting sunrise and sunset to be an hour earlier.

For reference, on June 20, the longest day of the year, the Sun rises at 6:19 AM and sets 14 hours, 1 minute later, at 8:20 PM, while on December 21, the shortest day of the year, it rises at 7:07 AM and sets 10 hours, 17 minutes later, at 5:24 PM.

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.

The figure below presents a compact representation of key lunar data for April 2024. 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.

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 in Siwa Oasis is essentially constant during April, remaining around 0% throughout.

For reference, on August 25, the muggiest day of the year, there are muggy conditions 4% of the time, while on November 22, the least muggy day of the year, there are muggy conditions 0% of the time.

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 Siwa Oasis is essentially constant during April, remaining within 0.1 miles per hour of 9.4 miles per hour throughout.

For reference, on April 13, the windiest day of the year, the daily average wind speed is 9.5 miles per hour, while on October 20, the calmest day of the year, the daily average wind speed is 7.3 miles per hour.

The highest daily average wind speed during April is 9.5 miles per hour on April 23.

The wind direction in Siwa Oasis during April is predominantly out of the north from April 1 to April 9 and from April 29 to April 30 and the east from April 9 to April 29.

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 Siwa Oasis 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.

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 in Siwa Oasis are rapidly increasing during April, increasing by 580°F, from 725°F to 1,305°F, over the course of the month.

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 in Siwa Oasis is gradually increasing during April, rising by 0.6 kWh, from 6.9 kWh to 7.4 kWh, over the course of the month.

For the purposes of this report, the geographical coordinates of Siwa Oasis are 29.203 deg latitude, 25.520 deg longitude, and -49 ft elevation.

The topography within 2 miles of Siwa Oasis is essentially flat, with a maximum elevation change of 82 feet and an average elevation above sea level of -43 feet. Within 10 miles is essentially flat (515 feet). Within 50 miles contains significant variations in elevation (899 feet).

The area within 2 miles of Siwa Oasis is covered by cropland (64%), bare soil (25%), and water (11%), within 10 miles by bare soil (74%) and herbaceous vegetation (14%), and within 50 miles by bare soil (97%).