Average Weather For Basseterre, St. Kitts and Nevis

Location

This report describes the typical weather at the Robert L. Bradshaw International Airport (Basseterre, St. Kitts and Nevis) weather station over the course of an average year. It is based on the historical records from 1999 to 2012. Earlier records are either unavailable or unreliable.

Basseterre has a tropical monsoon climate with short dry season. The area within 25 mi of this station is covered by oceans and seas (95%), grasslands (3%), and forests (2%).

Temperature

Over the course of a year, the temperature typically varies from 74°F to 88°F and is rarely below 72°F or above 90°F.

Daily High and Low Temperature

The daily average low (blue) and high (red) temperature with percentile bands (inner band from 25th to 75th percentile, outer band from 10th to 90th percentile).

The warm season lasts from July 14 to October 17 with an average daily high temperature above 87°F. The hottest day of the year is September 6, with an average high of 88°F and low of 79°F.

The cold season lasts from December 7 to March 20 with an average daily high temperature below 84°F. The coldest day of the year is February 20, with an average low of 74°F and high of 83°F.

Fraction of Time Spent in Various Temperature Bands

The average fraction of time spent in various temperature bands: frigid (below 15°F), freezing (15°F to 32°F), cold (32°F to 50°F), cool (50°F to 65°F), comfortable (65°F to 75°F), warm (75°F to 85°F), hot (85°F to 100°F) and sweltering (above 100°F).

Sun

The length of the day varies significantly over the course of the year. The shortest day is December 21 with 11:05 hours of daylight; the longest day is June 20 with 13:10 hours of daylight.

Daily Hours of Daylight and Twilight

The number of hours during which the Sun is visible (black line), with various degrees of daylight, twilight, and night, indicated by the color bands. From bottom (most yellow) to top (most gray): full daylight, solar twilight (Sun is visible but less than 6° from the horizon), civil twilight (Sun is not visible but is less than 6° below the horizon), nautical twilight (Sun is between 6° and 12° below the horizon), astronomical twilight (Sun is between 12° and 18° below the horizon), and full night.

The earliest sunrise is at 5:35am on June 4 and the latest sunset is at 6:50pm on July 7. The latest sunrise is at 6:44am on January 21 and the earliest sunset is at 5:34pm on November 20.

Daylight saving time (DST) is not observed in 2012.

Daily Sunrise & Sunset with Twilight

The solar day over the course of the year 2012 . From bottom to top, the black lines are the previous solar midnight, sunrise, solar noon, sunset, and the next solar midnight. The day, twilights (solar, civil, nautical, and astronomical), and night are indicated by the color bands from yellow to gray.

Clouds

The median cloud cover ranges from 49% (partly cloudy) to 68% (partly cloudy). The sky is cloudiest on May 21 and clearest on January 7. The clearer part of the year begins around June 30. The cloudier part of the year begins around April 12.

Median Cloud Cover

The median daily cloud cover (black line) with percentile bands (inner band from 40th to 60th percentile, outer band from 25th to 75th percentile).

On January 7, the clearest day of the year, the sky is clear, mostly clear, or partly cloudy 40% of the time, and overcast or mostly cloudy 16% of the time.

On May 21, the cloudiest day of the year, the sky is overcast, mostly cloudy, or partly cloudy 50% of the time, and clear or mostly clear 15% of the time.

Cloud Cover Types

The fraction of time spent in each of the five sky cover categories. From top (most blue) to bottom (most gray), the categories are clear, mostly clear, partly cloudy, mostly cloudy, and overcast. Pink indicates missing data. Outside of the United States clear skies are often reported ambiguously, leading them to be lumped in with the missing data.

Precipitation

The probability that precipitation will be observed at this location varies throughout the year. Precipitation is most likely around October 17, occurring in 45% of days. Precipitation is least likely around March 28, occurring in 30% of days.

Probability of Precipitation at Some Point in the Day

The fraction of days in which various types of precipitation are observed. If more than one type of precipitation is reported in a given day, the more severe precipitation is counted. For example, if light rain is observed in the same day as a thunderstorm, that day counts towards the thunderstorm totals. The order of severity is from the top down in this graph, with the most severe at the bottom.

Over the entire year, the most common forms of precipitation are light rain, moderate rain, and thunderstorms.

Light rain is the most severe precipitation observed during 58% of those days with precipitation. It is most likely around January 3, when it is observed during 27% of all days.

Moderate rain is the most severe precipitation observed during 23% of those days with precipitation. It is most likely around April 27, when it is observed during 10% of all days.

Thunderstorms are the most severe precipitation observed during 19% of those days with precipitation. They are most likely around September 15, when it is observed during 18% of all days.

Types of Precipitation Throughout the Year

Relative frequency of various types of precipitation over the course of a typical year.

During the warm season, which lasts from July 14 to October 17, there is a 41% average chance that precipitation will be observed at some point during a given day. When precipitation does occur it is most often in the form of light rain (43% of days with precipitation have at worst light rain), thunderstorms (36%), and moderate rain (19%).

During the cold season, which lasts from December 7 to March 20, there is a 34% average chance that precipitation will be observed at some point during a given day. When precipitation does occur it is most often in the form of light rain (71% of days with precipitation have at worst light rain) and moderate rain (26%).

Warm Season Precipitation

Cold Season Precipitation

Relative frequency of various types of precipitation during the warm and cold seasons respectively.

Snow

Either snow is exceptionally unlikely to fall at any time during the year at this location or this station does not reliably report precipitation types.

Humidity

The relative humidity typically ranges from 63% (mildly humid) to 91% (very humid) over the course of the year, rarely dropping below 54% (mildly humid) and reaching as high as 99% (very humid).

The air is driest around February 29, at which time the relative humidity drops below 67% (mildly humid) three days out of four; it is most humid around October 17, exceeding 88% (very humid) three days out of four.

Relative Humidity

The average daily high (blue) and low (brown) relative humidity with percentile bands (inner bands from 25th to 75th percentile, outer bands from 10th to 90th percentile).

Dew Point

Dew point is often a better measure of how comfortable a person will find the weather than relative humidity because it more directly relates to whether perspiration will evaporate from the skin, thereby cooling the body. Lower dew points feel drier and higher dew points feel more humid.

Over the course of a year, the dew point typically varies from 66°F (muggy) to 78°F (oppressive) and is rarely below 62°F (mildy humid) or above 79°F (oppressive).

Dew Point

The daily average low (blue) and high (red) dew point with percentile bands (inner band from 25th to 75th percentile, outer band from 10th to 90th percentile).

Wind

Over the course of the year typical wind speeds vary from 3 mph to 16 mph (light breeze to moderate breeze), rarely exceeding 21 mph (fresh breeze).

The highest average wind speed of 12 mph (moderate breeze) occurs around June 29, at which time the average daily maximum wind speed is 15 mph (moderate breeze).

The lowest average wind speed of 8 mph (gentle breeze) occurs around September 22, at which time the average daily maximum wind speed is 12 mph (moderate breeze).

Wind Speed

The average daily minimum (red), maximum (green), and average (black) wind speed with percentile bands (inner band from 25th to 75th percentile, outer band from 10th to 90th percentile).
The wind is most often out of the east (27% of the time) and north east (21% of the time). The wind is least often out of the north west (0% of the time), west (0% of the time), south west (1% of the time), south east (1% of the time), south (1% of the time), and north (3% of the time).

Wind Directions Over the Entire Year

The fraction of time spent with the wind blowing from the various directions over the entire year. Values do not sum to 100% because the wind direction is undefined when the wind speed is zero.

Fraction of Time Spent with Various Wind Directions

The fraction of time spent with the wind blowing from the various directions on a daily basis. Stacked values do not always sum to 100% because the wind direction is undefined when the wind speed is zero.