This report describes the typical weather at the Cyril E. King Airport (St. Thomas, US Virgin Islands) weather station over the course of an average February. It is based on the historical records from 1974 to 2012. Earlier records are either unavailable or unreliable.
St. Thomas has a tropical savanna climate with dry winters. The area within 25 mi of this station is covered by oceans and seas (99%).
The month of February is characterized by essentially constant daily high temperatures, with daily highs around 84°F throughout the month, exceeding 88°F or dropping below 81°F only one day in ten.
Over the course of February, the length of the day is essentially constant. The shortest day of the month is February 2 with 11:21 hours of daylight; the longest day is February 29 with 11:47 hours of daylight.
The earliest sunrise is at 6:39am on February 29; the latest sunset is at 6:26pm on February 29; the latest sunrise is at 6:53am on February 2; the earliest sunset is at 6:14pm on February 1.
Daylight savings time (DST) is not observed in 2012.
The median cloud cover is 22% (mostly clear) and does not vary substantially over the course of the month.
On February 15, a representative day, the sky is clear or mostly clear 51% of the time, partly cloudy 6% of the time, and mostly cloudy or overcast 18% of the time.
The average probability that some form of precipitation will be observed in a given day is 25%, with little variation over the course of the month.
Throughout February, the most common forms of precipitation are light rain, moderate rain, and heavy rain.
Light rain is the most severe precipitation observed during 55% of those days with precipitation. It is most likely around February 1, when it is observed during 15% of all days.
Moderate rain is the most severe precipitation observed during 28% of those days with precipitation. It is most likely around February 4, when it is observed during 7% of all days.
Heavy rain is the most severe precipitation observed during 16% of those days with precipitation. It is most likely around February 3, when it is observed during 5% of all days.
Either snow is exceptionally unlikely to fall at this location in February or this station does not reliably report precipitation types.
The relative humidity typically ranges from 56% (mildly humid) to 83% (humid) over the course of a typical February, rarely dropping below 46% (comfortable), or exceeding 92% (very humid).
The air is driest around February 27, at which time the relative humidity drops below 60% (mildly humid) three days out of four; it is most humid around February 1, rising above 79% (humid) three days out of four.
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 typical February, the dew point typically varies from 64°F (mildy humid) to 69°F (muggy) and is rarely below 59°F (comfortable) or above 73°F (very muggy).
Over the course of February typical wind speeds vary from 6 mph to 17 mph (light breeze to moderate breeze), rarely exceeding 22 mph (fresh breeze).
The highest average wind speed of 11 mph (gentle breeze) occurs around February 12, at which time the average daily maximum wind speed is 17 mph (moderate breeze).
The lowest average wind speed of 11 mph (gentle breeze) occurs around February 3, at which time the average daily maximum wind speed is 17 mph (moderate breeze).