Average Weather in Kassiri Sierra Leone
In Kassiri, the wet season is warm and overcast, the dry season is hot and partly cloudy, and it is oppressive year round. Over the course of the year, the temperature typically varies from 72°F to 92°F and is rarely below 65°F or above 95°F.
Based on the beach/pool score, the best time of year to visit Kassiri for hot-weather activities is from mid December to late February.
The hot season lasts for 3.8 months, from January 18 to May 11, with an average daily high temperature above 90°F. The hottest day of the year is March 2, with an average high of 92°F and low of 77°F.
The cool season lasts for 2.1 months, from July 6 to September 10, with an average daily high temperature below 84°F. The coldest day of the year is December 28, with an average low of 72°F and high of 88°F.
Average High and Low Temperature
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 Kassiri, 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 Kassiri begins around November 19 and lasts for 4.9 months, ending around April 14. On January 22, the clearest day of the year, the sky is clear, mostly clear, or partly cloudy 63% of the time, and overcast or mostly cloudy 37% of the time.
The cloudier part of the year begins around April 14 and lasts for 7.1 months, ending around November 19. On August 26, the cloudiest day of the year, the sky is overcast or mostly cloudy 80% of the time, and clear, mostly clear, or partly cloudy 20% of the time.
Cloud Cover Categories
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 Kassiri varies very significantly throughout the year.
The wetter season lasts 4.9 months, from May 24 to October 19, with a greater than 44% chance of a given day being a wet day. The chance of a wet day peaks at 89% on August 17.
The drier season lasts 7.1 months, from October 19 to May 24. The smallest chance of a wet day is 0% on January 1.
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 89% on August 17.
Daily Chance of Precipitation
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. Kassiri experiences extreme seasonal variation in monthly rainfall.
The rainy period of the year lasts for 8.1 months, from April 1 to December 3, with a sliding 31-day rainfall of at least 0.5 inches. The most rain falls during the 31 days centered around August 14, with an average total accumulation of 26.1 inches.
The rainless period of the year lasts for 3.9 months, from December 3 to April 1. The least rain falls around January 13, with an average total accumulation of 0.0 inches.
Average Monthly Rainfall
The length of the day in Kassiri does not vary substantially over the course of the year, staying within 38 minutes of 12 hours throughout. In 2018, the shortest day is December 21, with 11 hours, 36 minutes of daylight; the longest day is June 21, with 12 hours, 39 minutes of daylight.
Hours of Daylight and Twilight
The earliest sunrise is at 6:31 AM on May 28, and the latest sunrise is 42 minutes later at 7:13 AM on January 29. The earliest sunset is at 6:28 PM on November 15, and the latest sunset is 48 minutes later at 7:16 PM on July 13.
Daylight saving time (DST) is not observed in Kassiri during 2018.
Sunrise & Sunset with Twilight
Kassiri experiences some seasonal variation in the perceived humidity.
The muggier period of the year lasts for 11 months, from January 27 to December 23, during which time the comfort level is muggy, oppressive, or miserable at least 78% of the time. The muggiest day of the year is August 17, with muggy conditions 100% of the time.
The least muggy day of the year is January 11, with muggy conditions 71% of the time.
Humidity Comfort Levels
dry 55°F comfortable 60°F humid 65°F muggy 70°F oppressive 75°F miserable
The average hourly wind speed in Kassiri experiences significant seasonal variation over the course of the year.
The windier part of the year lasts for 3.1 months, from June 19 to September 23, with average wind speeds of more than 6.2 miles per hour. The windiest day of the year is August 8, with an average hourly wind speed of 8.4 miles per hour.
The calmer time of year lasts for 8.9 months, from September 23 to June 19. The calmest day of the year is November 13, with an average hourly wind speed of 3.9 miles per hour.
Average Wind Speed
The predominant average hourly wind direction in Kassiri varies throughout the year.
The wind is most often from the west for 11 months, from January 13 to December 2, with a peak percentage of 90% on April 8. The wind is most often from the east for 1.4 months, from December 2 to January 13, with a peak percentage of 40% on January 1.
Kassiri 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 does not vary significantly over the course of the year, remaining within 2°F of 82°F throughout.
Average Water Temperature
Best Time of Year to Visit
To characterize how pleasant the weather is in Kassiri 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 Kassiri for general outdoor tourist activities is from mid December to late January, with a peak score in the first week of January.
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 Kassiri for hot-weather activities is from mid December to late February, with a peak score in the third week of January.
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.
Temperatures in Kassiri 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
Growing Degree Days
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 2.6 months, from January 28 to April 17, with an average daily incident shortwave energy per square meter above 5.6 kWh. The brightest day of the year is March 20, with an average of 6.0 kWh.
The darker period of the year lasts for 5.8 months, from May 22 to November 17, with an average daily incident shortwave energy per square meter below 4.2 kWh. The darkest day of the year is October 21, with an average of 3.8 kWh.
Average Daily Incident Shortwave Solar Energy
For the purposes of this report, the geographical coordinates of Kassiri are 8.938 deg latitude, -13.115 deg longitude, and 13 ft elevation.
The topography within 2 miles of Kassiri contains only modest variations in elevation, with a maximum elevation change of 108 feet and an average elevation above sea level of 20 feet. Within 10 miles also contains only modest variations in elevation (184 feet). Within 50 miles contains only modest variations in elevation (3,930 feet).
The area within 2 miles of Kassiri is covered by cropland (56%), water (27%), and mangroves (11%), within 10 miles by cropland (41%) and water (22%), and within 50 miles by water (40%) and trees (24%).
This report illustrates the typical weather in Kassiri, 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 Kassiri.
For each station, the records are corrected for the elevation difference between that station and Kassiri 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 Kassiri is computed as the weighted average of the individual contributions from each station, with weights proportional to the inverse of the distance between Kassiri and a given station.
Time zones for aiports and weather stations are provided by AskGeo.com .