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Average Weather in Perai Gambia

In Perai, the wet season is hot, oppressive, and overcast and the dry season is sweltering and partly cloudy. Over the course of the year, the temperature typically varies from 65°F to 105°F and is rarely below 60°F or above 108°F.

Based on the beach/pool score, the best time of year to visit Perai for hot-weather activities is from late November to mid March.

Climate Summary

hotswelteringhothotJanFebMarAprMayJunJulAugSepOctNovDec62%62%23%23%overcastclearprecipitation: 9.5 inprecipitation: 9.5 in0.0 in0.0 inmuggy: 100%muggy: 100%0%0%drydrybeach/pool score: 7.3beach/pool score: 7.33.43.4
Click on each chart for more information.

Temperature

The hot season lasts for 2.7 months, from March 8 to May 30, with an average daily high temperature above 101°F. The hottest day of the year is April 20, with an average high of 105°F and low of 80°F.

The cool season lasts for 2.5 months, from July 11 to September 28, with an average daily high temperature below 91°F. The coldest day of the year is December 27, with an average low of 65°F and high of 93°F.

Average High and Low Temperature

The daily average high (red line) and low (blue line) temperature, with 25th to 75th and 10th to 90th percentile bands. The thin dotted lines are the corresponding average perceived temperatures.

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

Average Hourly Temperature in PeraiJanFebMarAprMayJunJulAugSepOctNovDec12 AM4 AM8 AM12 PM4 PM8 PM12 AMcomfortablecomfortablewarmwarmwarmhothotswelteringsweltering
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
The average hourly temperature, color coded into bands. The shaded overlays indicate night and civil twilight.

Ad Dindar, Sudan (3,239 miles away) is the far-away foreign place with temperatures most similar to Perai (view comparison).

Clouds

In Perai, 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 Perai begins around November 14 and lasts for 7.3 months, ending around June 22. On March 2, the clearest day of the year, the sky is clear, mostly clear, or partly cloudy 62% of the time, and overcast or mostly cloudy 38% of the time.

The cloudier part of the year begins around June 22 and lasts for 4.7 months, ending around November 14. On August 30, the cloudiest day of the year, the sky is overcast or mostly cloudy 77% of the time, and clear, mostly clear, or partly cloudy 23% of the time.

Cloud Cover Categories

Cloud Cover Categories in PeraiclearerclearercloudierJanFebMarAprMayJunJulAugSepOctNovDec0%100%10%90%20%80%30%70%40%60%50%50%60%40%70%30%80%20%90%10%100%0%Mar 262%Mar 262%Aug 3023%Aug 3023%Nov 1442%Nov 1442%Jun 2243%Jun 2243%clearmostly clearpartly cloudymostly cloudyovercast
0% clear 20% mostly clear 40% partly cloudy 60% mostly cloudy 80% overcast 100%
The percentage of time spent in each cloud cover band, categorized by the percentage of the sky covered by clouds.

Precipitation

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

The wetter season lasts 3.5 months, from June 20 to October 5, with a greater than 43% chance of a given day being a wet day. The chance of a wet day peaks at 87% on August 23.

The drier season lasts 8.5 months, from October 5 to June 20. The smallest chance of a wet day is 0% on January 19.

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 87% on August 23.

Daily Chance of Precipitation

Daily Chance of Precipitation in PeraiwetdrydryJanFebMarAprMayJunJulAugSepOctNovDec0%10%20%30%40%50%60%70%80%90%100%Aug 2387%Aug 2387%Jan 190%Jan 190%Jan 10%Jan 10%Jun 2043%Jun 2043%Oct 543%Oct 543%rain
The percentage of days in which various types of precipitation are observed, excluding trace quantities: rain alone, snow alone, and mixed (both rain and snow fell in the same day).

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. Perai experiences extreme seasonal variation in monthly rainfall.

The rainy period of the year lasts for 5.5 months, from May 17 to November 3, with a sliding 31-day rainfall of at least 0.5 inches. The most rain falls during the 31 days centered around August 22, with an average total accumulation of 9.5 inches.

The rainless period of the year lasts for 6.5 months, from November 3 to May 17. The least rain falls around February 26, with an average total accumulation of 0.0 inches.

Average Monthly Rainfall

The average rainfall (solid line) accumulated over the course of a sliding 31-day period centered on the day in question, with 25th to 75th and 10th to 90th percentile bands. The thin dotted line is the corresponding average liquid-equivalent snowfall.

Sun

The length of the day in Perai varies over the course of the year. In 2018, the shortest day is December 21, with 11 hours, 20 minutes of daylight; the longest day is June 21, with 12 hours, 55 minutes of daylight.

Hours of Daylight and Twilight

The number of hours during which the Sun is visible (black line). From bottom (most yellow) to top (most gray), the color bands indicate: full daylight, twilight (civil, nautical, and astronomical), and full night.

The earliest sunrise is at 6:28 AM on June 1, and the latest sunrise is 55 minutes later at 7:23 AM on January 24. The earliest sunset is at 6:25 PM on November 20, and the latest sunset is 1 hour, 2 minutes later at 7:27 PM on July 8.

Daylight saving time (DST) is not observed in Perai during 2018.

Sunrise & Sunset with Twilight

Sunrise & Sunset with Twilight in PeraiJanFebMarAprMayJunJulAugSepOctNovDec2 AM4 AM6 AM8 AM10 AM12 PM2 PM4 PM6 PM8 PM10 PM12 AMJun 16:28 AMJun 16:28 AM7:27 PMJul 87:27 PMJul 8Nov 206:25 PMNov 206:25 PM7:23 AMJan 247:23 AMJan 24daynightnightSolarMidnightSolarMidnightSolarNoonSunriseSunset
The solar day over the course of the year 2018. From bottom to top, the black lines are the previous solar midnight, sunrise, solar noon, sunset, and the next solar midnight. The day, twilights (civil, nautical, and astronomical), and night are indicated by the color bands from yellow to gray.

Humidity

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.

Perai experiences extreme seasonal variation in the perceived humidity.

The muggier period of the year lasts for 6.4 months, from May 6 to November 20, during which time the comfort level is muggy, oppressive, or miserable at least 25% of the time. The muggiest day of the year is August 28, with muggy conditions 100% of the time.

The least muggy day of the year is January 11, when muggy conditions are essentially unheard of.

Humidity Comfort Levels

Humidity Comfort Levels in PeraimuggyJanFebMarAprMayJunJulAugSepOctNovDec0%10%20%30%40%50%60%70%80%90%100%Jan 110%Jan 110%100%Aug 28100%Aug 28May 625%May 625%Nov 2025%Nov 2025%miserablemiserableoppressiveoppressivedrydryhumidhumidmuggymuggy
dry 55°F comfortable 60°F humid 65°F muggy 70°F oppressive 75°F miserable
The percentage of time spent at various humidity comfort levels, categorized by dew point.

Wind

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

The windier part of the year lasts for 7.3 months, from December 5 to July 15, with average wind speeds of more than 7.3 miles per hour. The windiest day of the year is January 30, with an average hourly wind speed of 9.8 miles per hour.

The calmer time of year lasts for 4.7 months, from July 15 to December 5. The calmest day of the year is October 18, with an average hourly wind speed of 4.8 miles per hour.

Average Wind Speed

The average of mean hourly wind speeds (dark gray line), with 25th to 75th and 10th to 90th percentile bands.

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

The wind is most often from the north for 3.1 months, from January 23 to April 27, with a peak percentage of 60% on March 6. The wind is most often from the west for 6.1 months, from April 27 to October 31, with a peak percentage of 65% on July 3. The wind is most often from the east for 2.7 months, from October 31 to January 23, with a peak percentage of 59% on January 1.

Wind Direction

Wind Direction in PeraiENWEJanFebMarAprMayJunJulAugSepOctNovDec0%100%20%80%40%60%60%40%80%20%100%0%westeastnorthsouth
northeastsouthwest
The percentage of hours in which the mean wind direction is from each of the four cardinal wind directions, excluding hours in which the mean wind speed is less than 1.0 mph. The lightly tinted areas at the boundaries are the percentage of hours spent in the implied intermediate directions (northeast, southeast, southwest, and northwest).

Best Time of Year to Visit

To characterize how pleasant the weather is in Perai 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 Perai for general outdoor tourist activities is from mid December to early February, with a peak score in the second week of January.

Tourism Score

Tourism Score in PeraiJanFebMarAprMayJunJulAugSepOctNovDec02468105.85.82.22.2 precipitationprecipitationcloudscloudstemperaturetemperaturetourism score
The tourism score (filled area), and its constituents: the temperature score (red line), the cloud cover score (blue line), and the precipitation score (green line).

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 Perai for hot-weather activities is from late November to mid March, with a peak score in the last week of January.

Beach/Pool Score

Beach/Pool Score in Peraibest timeJanFebMarAprMayJunJulAugSepOctNovDec02468107.37.33.43.4 precipitationprecipitationcloudscloudstemperaturetemperaturebeach/pool score
The beach/pool score (filled area), and its constituents: the temperature score (red line), the cloud cover score (blue line), and the precipitation score (green line).

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.

Growing Season

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 Perai 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

Time Spent in Various Temperature Bands and the Growing Season in PeraiJanFebMarAprMayJunJulAugSepOctNovDec0%100%10%90%20%80%30%70%40%60%50%50%60%40%70%30%80%20%90%10%100%0%100%Jan 1100%Jan 1100%Jul 3100%Jul 3warmhotswelteringcomfortablecool
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
The percentage of time spent in various temperature bands. The black line is the percentage chance that a given day is within the growing season.

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

Growing Degree Days in PeraiJanFebMarAprMayJunJulAugSepOctNovDec0°F2,000°F4,000°F6,000°F8,000°F10,000°FJan 490°FJan 490°FDec 3111,448°FDec 3111,448°F
The average growing degree days accumulated over the course of the year, with 25th to 75th and 10th to 90th percentile bands.

Solar Energy

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 2.4 months, from March 7 to May 21, with an average daily incident shortwave energy per square meter above 6.6 kWh. The brightest day of the year is April 12, with an average of 7.1 kWh.

The darker period of the year lasts for 5.9 months, from July 10 to January 8, with an average daily incident shortwave energy per square meter below 5.2 kWh. The darkest day of the year is August 24, with an average of 4.7 kWh.

Average Daily Incident Shortwave Solar Energy

Average Daily Incident Shortwave Solar Energy in PeraibrightdarkJanFebMarAprMayJunJulAugSepOctNovDec0 kWh1 kWh2 kWh3 kWh4 kWh5 kWh6 kWh7 kWh8 kWhApr 127.1 kWhApr 127.1 kWhAug 244.7 kWhAug 244.7 kWhJul 105.2 kWhJul 105.2 kWhJan 85.2 kWhJan 85.2 kWh
The average daily shortwave solar energy reaching the ground per square meter (orange line), with 25th to 75th and 10th to 90th percentile bands.

Topography

For the purposes of this report, the geographical coordinates of Perai are 13.383 deg latitude, -14.033 deg longitude, and 72 ft elevation.

The topography within 2 miles of Perai contains only modest variations in elevation, with a maximum elevation change of 164 feet and an average elevation above sea level of 69 feet. Within 10 miles also contains only modest variations in elevation (220 feet). Within 50 miles also contains only modest variations in elevation (308 feet).

The area within 2 miles of Perai is covered by cropland (37%), shrubs (31%), trees (16%), and grassland (16%), within 10 miles by cropland (43%) and shrubs (28%), and within 50 miles by trees (41%) and shrubs (27%).

Data Sources

This report illustrates the typical weather in Perai, 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 are 2 weather stations near enough to contribute to our estimation of the temperature and dew point in Perai.

For each station, the records are corrected for the elevation difference between that station and Perai according to the International Standard Atmosphere , and by the relative change present in the MERRA-2 satellite-era reanalysis between the two locations.

The estimated value at Perai is computed as the weighted average of the individual contributions from each station, with weights proportional to the inverse of the distance between Perai and a given station.

The stations contributing to this reconstruction are: Tambacounda (74%, 57 kilometers, northeast) and Kolda North Airport (26%, 116 kilometers, southwest).

Other Data

All data relating to the Sun's position (e.g., sunrise and sunset) are computed using astronomical formulas from the book, Astronomical Tables of the Sun, Moon and Planets , 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 aiports 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.

Disclaimer

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.