Climate and Average Weather Year Round in Jiblah Yemen

In Jiblah, the summers are short, warm, and overcast; the winters are short, cool, and mostly clear; and it is dry year round. Over the course of the year, the temperature typically varies from 44°F to 80°F and is rarely below 40°F or above 84°F.

Based on the tourism score, the best times of year to visit Jiblah for warm-weather activities are from late February to mid May and from late August to mid November.

The warm season lasts for 2.1 months, from May 12 to July 14, with an average daily high temperature above 77°F. The hottest month of the year in Jiblah is June, with an average high of 80°F and low of 58°F.

The cool season lasts for 2.8 months, from November 20 to February 12, with an average daily high temperature below 70°F. The coldest month of the year in Jiblah is January, with an average low of 45°F and high of 68°F.

In Jiblah, the average percentage of the sky covered by clouds experiences extreme seasonal variation over the course of the year.

The clearer part of the year in Jiblah begins around September 20 and lasts for 7.2 months, ending around April 27.

The clearest month of the year in Jiblah is November, during which on average the sky is clear, mostly clear, or partly cloudy 77% of the time.

The cloudier part of the year begins around April 27 and lasts for 4.8 months, ending around September 20.

The cloudiest month of the year in Jiblah is July, during which on average the sky is overcast or mostly cloudy 73% of the time.

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

The wetter season lasts 2.3 months, from July 4 to September 14, with a greater than 11% chance of a given day being a wet day. The month with the most wet days in Jiblah is August, with an average of 5.4 days with at least 0.04 inches of precipitation.

The drier season lasts 9.7 months, from September 14 to July 4. The month with the fewest wet days in Jiblah is November, with an average of 0.5 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 Jiblah is August, with an average of 5.4 days. Based on this categorization, the most common form of precipitation throughout the year is rain alone, with a peak probability of 20% on August 2.

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. Jiblah experiences some seasonal variation in monthly rainfall.

The rainy period of the year lasts for 6.5 months, from March 28 to October 10, with a sliding 31-day rainfall of at least 0.5 inches. The month with the most rain in Jiblah is August, with an average rainfall of 1.6 inches.

The rainless period of the year lasts for 5.5 months, from October 10 to March 28. The month with the least rain in Jiblah is December, with an average rainfall of 0.2 inches.

The length of the day in Jiblah varies over the course of the year. In 2024, the shortest day is December 21, with 11 hours, 18 minutes of daylight; the longest day is June 20, with 12 hours, 57 minutes of daylight.

The earliest sunrise is at 5:34 AM on June 2, and the latest sunrise is 57 minutes later at 6:31 AM on January 23. The earliest sunset is at 5:32 PM on November 20, and the latest sunset is 1 hour, 4 minutes later at 6:35 PM on July 9.

Daylight saving time (DST) is not observed in Jiblah during 2024.

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

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 Jiblah, 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.

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 Jiblah experiences significant seasonal variation over the course of the year.

The windier part of the year lasts for 1.8 months, from June 24 to August 18, with average wind speeds of more than 5.9 miles per hour. The windiest month of the year in Jiblah is July, with an average hourly wind speed of 7.3 miles per hour.

The calmer time of year lasts for 10 months, from August 18 to June 24. The calmest month of the year in Jiblah is September, with an average hourly wind speed of 4.5 miles per hour.

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

The wind is most often from the north for 3.6 months, from June 1 to September 19, with a peak percentage of 54% on July 23. The wind is most often from the east for 8.4 months, from September 19 to June 1, with a peak percentage of 43% on January 1.

Jiblah 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 4.7 months, from May 21 to October 12, with an average temperature above 86°F. The month of the year in Jiblah with the warmest water is September, with an average temperature of 88°F.

The time of year with cooler water lasts for 3.6 months, from December 3 to March 21, with an average temperature below 80°F. The month of the year in Jiblah with the coolest water is January, with an average temperature of 78°F.

To characterize how pleasant the weather is in Jiblah 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 Jiblah for general outdoor tourist activities are from late February to mid May and from late August to mid November, with a peak score in the second week of October.

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 Jiblah for hot-weather activities is from mid May to early July, with a peak score in the second 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 Jiblah 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 some seasonal variation over the course of the year.

The brighter period of the year lasts for 2.5 months, from February 19 to May 4, with an average daily incident shortwave energy per square meter above 6.8 kWh. The brightest month of the year in Jiblah is March, with an average of 7.1 kWh.

The darker period of the year lasts for 1.5 months, from July 8 to August 24, with an average daily incident shortwave energy per square meter below 5.7 kWh. The darkest month of the year in Jiblah is July, with an average of 5.6 kWh.

For the purposes of this report, the geographical coordinates of Jiblah are 13.922 deg latitude, 44.147 deg longitude, and 6,572 ft elevation.

The topography within 2 miles of Jiblah contains large variations in elevation, with a maximum elevation change of 2,198 feet and an average elevation above sea level of 7,099 feet. Within 10 miles contains large variations in elevation (6,148 feet). Within 50 miles also contains extreme variations in elevation (10,358 feet).

The area within 2 miles of Jiblah is covered by bare soil (60%) and sparse vegetation (40%), within 10 miles by bare soil (59%) and sparse vegetation (35%), and within 50 miles by bare soil (57%) and sparse vegetation (31%).