This report describes the typical weather at the Maurice Bishop International Airport (St. George's, Grenada) weather station over the course of an average year. It is based on the historical records from 1991 to 2012. Earlier records are either unavailable or unreliable.
St. George's has a tropical rainforest climate with no dry season. The area within 25 mi of this station is covered by oceans and seas (94%) and grasslands (5%).
Over the course of a year, the temperature typically varies from 75°F to 87°F and is rarely below 72°F or above 90°F.
The warm season lasts from August 18 to October 27 with an average daily high temperature above 87°F. The hottest day of the year is September 13, with an average high of 87°F and low of 79°F.
The cold season lasts from December 31 to March 13 with an average daily high temperature below 85°F. The coldest day of the year is January 25, with an average low of 75°F and high of 84°F.
The length of the day does not vary substantially over the course of the year, staying within 51 minutes of 12 hours throughout. The shortest day is December 21 with 11:25 hours of daylight; the longest day is June 20 with 12:51 hours of daylight.
The earliest sunrise is at 5:41am on June 1 and the latest sunset is at 6:36pm on July 9. The latest sunrise is at 6:33am on January 25 and the earliest sunset is at 5:39pm on November 19.
Daylight saving time (DST) is not observed in 2012.
The median cloud cover ranges from 43% (partly cloudy) to 63% (partly cloudy). The sky is cloudiest on June 12 and clearest on January 25. The clearer part of the year begins around August 8. The cloudier part of the year begins around April 6.
On January 25, the clearest day of the year, the sky is clear, mostly clear, or partly cloudy 65% of the time, and overcast or mostly cloudy 20% of the time.
On June 12, the cloudiest day of the year, the sky is overcast, mostly cloudy, or partly cloudy 62% of the time, and clear or mostly clear 24% of the time.
The probability that precipitation will be observed at this location varies throughout the year. Precipitation is most likely around July 14, occurring in 72% of days. Precipitation is least likely around April 13, occurring in 40% of days.
Over the entire year, the most common forms of precipitation are moderate rain, light rain, and thunderstorms.
Moderate rain is the most severe precipitation observed during 54% of those days with precipitation. It is most likely around June 30, when it is observed during 42% of all days.
Light rain is the most severe precipitation observed during 31% of those days with precipitation. It is most likely around February 6, when it is observed during 23% of all days.
Thunderstorms are the most severe precipitation observed during 11% of those days with precipitation. They are most likely around September 17, when it is observed during 18% of all days.
During the warm season, which lasts from August 18 to October 27, there is a 60% 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 moderate rain (44% of days with precipitation have at worst moderate rain), thunderstorms (27%), and light rain (25%).
During the cold season, which lasts from December 31 to March 13, there is a 55% 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 moderate rain (58% of days with precipitation have at worst moderate rain) and light rain (39%).
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.
The relative humidity typically ranges from 64% (mildly humid) to 95% (very humid) over the course of the year, rarely dropping below 57% (mildly humid) and reaching as high as 100% (very humid).
The air is driest around February 27, at which time the relative humidity drops below 68% (mildly humid) three days out of four; it is most humid around November 15, exceeding 92% (very 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 year, the dew point typically varies from 69°F (muggy) to 79°F (oppressive) and is rarely below 66°F (muggy) or above 81°F (very oppressive).
Over the course of the year typical wind speeds vary from 1 mph to 19 mph (light air to fresh breeze), rarely exceeding 24 mph (fresh breeze).
The highest average wind speed of 14 mph (moderate breeze) occurs around May 31, at which time the average daily maximum wind speed is 19 mph (fresh breeze).
The lowest average wind speed of 9 mph (gentle breeze) occurs around October 26, at which time the average daily maximum wind speed is 16 mph (moderate breeze).