Climate and Average Weather Year Round in Rosetta Egypt

In Rosetta, the summers are oppressive, arid, clear, long, and warm and the winters are dry, mostly clear, windy, and cool. Over the course of the year, the temperature typically varies from 51°F to 85°F and is rarely below 47°F or above 88°F.

Based on the beach/pool score, the best time of year to visit Rosetta for hot-weather activities is from early June to mid October.

The hot season lasts for 4.1 months, from June 7 to October 11, with an average daily high temperature above 81°F. The hottest month of the year in Rosetta is August, with an average high of 85°F and low of 77°F.

The cool season lasts for 3.3 months, from December 12 to March 21, with an average daily high temperature below 68°F. The coldest month of the year in Rosetta is January, with an average low of 52°F and high of 64°F.

In Rosetta, 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 Rosetta begins around May 22 and lasts for 5.0 months, ending around October 20.

The clearest month of the year in Rosetta is August, during which on average the sky is clear, mostly clear, or partly cloudy 100% of the time.

The cloudier part of the year begins around October 20 and lasts for 7.0 months, ending around May 22.

The cloudiest month of the year in Rosetta is December, during which on average the sky is overcast or mostly cloudy 30% of the time.

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

The wetter season lasts 3.4 months, from November 22 to March 2, with a greater than 7% chance of a given day being a wet day. The month with the most wet days in Rosetta is January, with an average of 3.9 days with at least 0.04 inches of precipitation.

The drier season lasts 8.7 months, from March 2 to November 22. The month with the fewest wet days in Rosetta is July, with an average of 0.0 days with at least 0.04 inches of precipitation.

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 Rosetta is January, with an average of 3.9 days. Based on this categorization, the most common form of precipitation throughout the year is rain alone, with a peak probability of 14% on January 17.

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. Rosetta experiences some seasonal variation in monthly rainfall.

The rainy period of the year lasts for 2.9 months, from November 25 to February 21, with a sliding 31-day rainfall of at least 0.5 inches. The month with the most rain in Rosetta is December, with an average rainfall of 0.7 inches.

The rainless period of the year lasts for 9.1 months, from February 21 to November 25. The month with the least rain in Rosetta is July, with an average rainfall of -0.0 inches.

The length of the day in Rosetta varies significantly over the course of the year. In 2026, the shortest day is December 21, with 10 hours, 6 minutes of daylight; the longest day is June 21, with 14 hours, 12 minutes of daylight.

The earliest sunrise is at 5:21 AM on April 23, and the latest sunrise is 1 hour, 50 minutes later at 7:11 AM on October 29. The earliest sunset is at 4:54 PM on December 3, and the latest sunset is 3 hours, 12 minutes later at 8:06 PM on June 30.

Daylight saving time (DST) is observed in Rosetta during 2026, starting in the spring on April 24, lasting 6.2 months, and ending in the fall on October 29.

The figure below presents a compact representation of key lunar data for 2026. 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.

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.

Rosetta experiences extreme seasonal variation in the perceived humidity.

The muggier period of the year lasts for 4.9 months, from May 27 to October 24, during which time the comfort level is muggy, oppressive, or miserable at least 25% of the time. The month with the most muggy days in Rosetta is August, with 29.9 days that are muggy or worse.

The month with the fewest muggy days in Rosetta is January, with 0.0 days that are muggy or worse.

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 Rosetta experiences mild seasonal variation over the course of the year.

The windier part of the year lasts for 4.7 months, from December 13 to May 3, with average wind speeds of more than 10.9 miles per hour. The windiest month of the year in Rosetta is February, with an average hourly wind speed of 11.8 miles per hour.

The calmer time of year lasts for 7.3 months, from May 3 to December 13. The calmest month of the year in Rosetta is October, with an average hourly wind speed of 9.9 miles per hour.

The predominant average hourly wind direction in Rosetta varies throughout the year.

The wind is most often from the north for 8.9 months, from March 13 to December 10, with a peak percentage of 76% on September 23. The wind is most often from the west for 3.1 months, from December 10 to March 13, with a peak percentage of 42% on January 1.

Rosetta is located near a large body of water (e.g., ocean, sea, or large lake). This section reports on the wide-area average surface temperature of that water.

The average water temperature experiences some seasonal variation over the course of the year.

The time of year with warmer water lasts for 3.5 months, from July 2 to October 17, with an average temperature above 77°F. The month of the year in Rosetta with the warmest water is August, with an average temperature of 81°F.

The time of year with cooler water lasts for 3.8 months, from December 31 to April 24, with an average temperature below 66°F. The month of the year in Rosetta with the coolest water is February, with an average temperature of 63°F.

To characterize how pleasant the weather is in Rosetta 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 Rosetta for general outdoor tourist activities are from late March to late June and from late September to late November, with a peak score in the first week of June.

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 Rosetta for hot-weather activities is from early June to mid October, with a peak score in the last week of June.

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.

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 Rosetta 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.

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 3.7 months, from May 5 to August 27, with an average daily incident shortwave energy per square meter above 7.4 kWh. The brightest month of the year in Rosetta is June, with an average of 8.4 kWh.

The darker period of the year lasts for 3.1 months, from November 6 to February 10, with an average daily incident shortwave energy per square meter below 4.1 kWh. The darkest month of the year in Rosetta is December, with an average of 3.0 kWh.

For the purposes of this report, the geographical coordinates of Rosetta are 31.400 deg latitude, 30.417 deg longitude, and 49 ft elevation.

The topography within 2 miles of Rosetta is essentially flat, with a maximum elevation change of 85 feet and an average elevation above sea level of 9 feet. Within 10 miles is essentially flat (161 feet). Within 50 miles also contains only modest variations in elevation (377 feet).

The area within 2 miles of Rosetta is covered by cropland (81%) and artificial surfaces (13%), within 10 miles by cropland (48%) and water (39%), and within 50 miles by water (54%) and cropland (41%).