Average Weather in Grenville Grenada

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In Grenville, the wet season is hot, windy, and mostly cloudy; the dry season is warm, extremely windy, and partly cloudy; and it is oppressive year round. Over the course of the year, the temperature typically varies from 75°F to 87°F and is rarely below 72°F or above 88°F.

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.

In Grenville, 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 Grenville begins around December 6 and lasts for 3.9 months, ending around April 2. On January 16, the clearest day of the year, the sky is clear, mostly clear, or partly cloudy 48% of the time, and overcast or mostly cloudy 52% of the time.

The cloudier part of the year begins around April 2 and lasts for 8.1 months, ending around December 6. On September 27, the cloudiest day of the year, the sky is overcast or mostly cloudy 73% of the time, and clear, mostly clear, or partly cloudy 27% of the time.

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

The wetter season lasts 6.5 months, from May 25 to December 8, with a greater than 31% chance of a given day being a wet day. The chance of a wet day peaks at 57% on August 13.

The drier season lasts 5.5 months, from December 8 to May 25. The smallest chance of a wet day is 4% on March 3.

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 57% on August 13.

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. Grenville experiences extreme seasonal variation in monthly rainfall.

The rainy period of the year lasts for 9.9 months, from April 1 to January 30, with a sliding 31-day rainfall of at least 0.5 inches. The most rain falls during the 31 days centered around November 9, with an average total accumulation of 4.6 inches.

The rainless period of the year lasts for 2.0 months, from January 30 to April 1. The least rain falls around March 4, with an average total accumulation of 0.3 inches.

The length of the day in Grenville does not vary substantially over the course of the year, staying within 50 minutes of 12 hours throughout. In 2017, the shortest day is December 21, with 11 hours, 25 minutes of daylight; the longest day is June 21, with 12 hours, 50 minutes of daylight.

The earliest sunrise is at 5:40 AM on May 31, and the latest sunrise is 51 minutes later at 6:32 AM on January 24. The earliest sunset is at 5:38 PM on November 18, and the latest sunset is 58 minutes later at 6:35 PM on July 10.

Daylight saving time (DST) is not observed in Grenville during 2017.

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.

The perceived humidity level in Grenville, as measured by the percentage of time in which the humidity comfort level is muggy, oppressive, or miserable, does not vary significantly over the course of the year, remaining a virtually constant 100% throughout.

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 Grenville experiences mild seasonal variation over the course of the year.

The windier part of the year lasts for 8.1 months, from November 23 to July 25, with average wind speeds of more than 8.3 miles per hour. The windiest day of the year is February 10, with an average hourly wind speed of 9.7 miles per hour.

The calmer time of year lasts for 3.9 months, from July 25 to November 23. The calmest day of the year is September 14, with an average hourly wind speed of 7.0 miles per hour.

The predominant average hourly wind direction in Grenville is from the east throughout the year.

Grenville 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 experiences some seasonal variation over the course of the year.

The time of year with warmer water lasts for 2.8 months, from August 13 to November 6, with an average temperature above 83°F. The day of the year with the warmest water is September 14, with an average temperature of 84°F.

The time of year with cooler water lasts for 3.5 months, from January 5 to April 20, with an average temperature below 81°F. The day of the year with the coolest water is February 24, with an average temperature of 80°F.

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 2.7 months, from February 20 to May 10, with an average daily incident shortwave energy per square meter above 6.5 kWh. The brightest day of the year is April 1, with an average of 7.0 kWh.

The darker period of the year lasts for 2.6 months, from September 13 to November 30, with an average daily incident shortwave energy per square meter below 5.1 kWh. The darkest day of the year is October 13, with an average of 4.5 kWh.

For the purposes of this report, the geographical coordinates of Grenville are 12.123 deg latitude, -61.625 deg longitude, and 118 ft elevation.

The topography within 2 miles of Grenville contains significant variations in elevation, with a maximum elevation change of 804 feet and an average elevation above sea level of 163 feet. Within 10 miles contains significant variations in elevation (2,700 feet). Within 50 miles also contains large variations in elevation (2,717 feet).

The area within 2 miles of Grenville is covered by cropland (36%), water (31%), and trees (26%), within 10 miles by water (67%) and trees (16%), and within 50 miles by water (98%).

This report illustrates the typical weather in Grenville, 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 3 weather stations near enough to contribute to our estimation of the temperature and dew point in Grenville.

For each station, the records are corrected for the elevation difference between that station and Grenville 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 Grenville is computed as the weighted average of the individual contributions from each station, with weights proportional to the inverse of the distance between Grenville and a given station.

The stations contributing to this reconstruction are: Maurice Bishop International Airport (91%, 22 kilometers, southwest); Arthur Napoleon Raymond Robinson International Airport (6%, 138 kilometers, southeast); and Hewanorra International Airport (3.5%, 195 kilometers, north).

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.