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5. Negril
6. December

Average Weather in December in Negril Jamaica

Daily high temperatures are around 83°F, rarely falling below 80°F or exceeding 86°F.

Daily low temperatures are around 76°F, rarely falling below 73°F or exceeding 80°F.

For reference, on July 31, the hottest day of the year, temperatures in Negril typically range from 79°F to 88°F, while on February 20, the coldest day of the year, they range from 75°F to 82°F.

The figure below shows you a compact characterization of the hourly average temperatures for the quarter of the year centered on December. The horizontal axis is the day, the vertical axis is the hour of the day, and the color is the average temperature for that hour and day.

Tevaitoa, French Polynesia (5,536 miles away) and Recife, Brazil (3,481 miles) are the far-away foreign places with temperatures most similar to Negril (view comparison).

The month of December in Negril experiences very rapidly decreasing cloud cover, with the percentage of time that the sky is overcast or mostly cloudy decreasing from 41% to 24%.

The clearest day of the month is December 31, with clear, mostly clear, or partly cloudy conditions 76% of the time.

For reference, on June 13, the cloudiest day of the year, the chance of overcast or mostly cloudy conditions is 80%, while on January 30, the clearest day of the year, the chance of clear, mostly clear, or partly cloudy skies is 81%.

A wet day is one with at least 0.04 inches of liquid or liquid-equivalent precipitation. In Negril, the chance of a wet day over the course of December is very rapidly decreasing, starting the month at 21% and ending it at 12%.

For reference, the year's highest daily chance of a wet day is 53% on September 27, and its lowest chance is 11% on February 11.

Rainfall

To show variation within the month and not just the monthly total, we show the rainfall accumulated over a sliding 31-day period centered around each day.

The average sliding 31-day rainfall during December in Negril is rapidly decreasing, starting the month at 2.0 inches, when it rarely exceeds 4.5 inches or falls below 0.2 inches, and ending the month at 0.9 inches, when it rarely exceeds 2.1 inches or falls below 0.1 inches.

Over the course of December in Negril, the length of the day is essentially constant. The shortest day of the month is December 21, with 11 hours, 2 minutes of daylight and the longest day is December 1, with 11 hours, 7 minutes of daylight.

The earliest sunrise of the month in Negril is 6:29 AM on December 1 and the latest sunrise is 16 minutes later at 6:45 AM on December 31.

The earliest sunset is 5:35 PM on December 1 and the latest sunset is 12 minutes later at 5:48 PM on December 31.

Daylight saving time is not observed in Negril during 2020.

For reference, on June 20, the longest day of the year, the Sun rises at 5:38 AM and sets 13 hours, 14 minutes later, at 6:51 PM, while on December 21, the shortest day of the year, it rises at 6:40 AM and sets 11 hours, 2 minutes later, at 5:42 PM.

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 chance that a given day will be muggy in Negril is gradually decreasing during December, falling from 99% to 95% over the course of the month.

The lowest chance of a muggy day during December is 95% on December 27.

For reference, on August 7, the muggiest day of the year, there are muggy conditions 100% of the time, while on March 9, the least muggy day of the year, there are muggy conditions 94% of the time.

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 Negril is essentially constant during December, remaining within 0.3 miles per hour of 13.3 miles per hour throughout.

For reference, on December 22, the windiest day of the year, the daily average wind speed is 13.5 miles per hour, while on October 2, the calmest day of the year, the daily average wind speed is 9.5 miles per hour.

The highest daily average wind speed during December is 13.5 miles per hour on December 24.

The hourly average wind direction in Negril throughout December is predominantly from the east, with a peak proportion of 80% on December 9.

Negril 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 surface water temperature in Negril is essentially constant during December, remaining within 1°F of 82°F throughout.

Definitions of the growing season vary throughout the world, but for the purposes of this report, we define it as the longest continuous period of non-freezing temperatures (≥ 32°F) in the year (the calendar year in the Northern Hemisphere, or from July 1 until June 30 in the Southern Hemisphere).

Temperatures in Negril 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.

Growing degree days are a measure of yearly heat accumulation used to predict plant and animal development, and defined as the integral of warmth above a base temperature, discarding any excess above a maximum temperature. In this report, we use a base of 50°F and a cap of 86°F.

The average accumulated growing degree days in Negril are very rapidly increasing during December, increasing by 900°F, from 10,361°F to 11,261°F, over the course of the month.

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 in Negril is essentially constant during December, remaining within 0.1 kWh of 4.8 kWh throughout.

For the purposes of this report, the geographical coordinates of Negril are 18.268 deg latitude, -78.348 deg longitude, and 10 ft elevation.

The topography within 2 miles of Negril contains significant variations in elevation, with a maximum elevation change of 502 feet and an average elevation above sea level of 111 feet. Within 10 miles contains significant variations in elevation (925 feet). Within 50 miles contains very significant variations in elevation (2,654 feet).

The area within 2 miles of Negril is covered by water (33%), trees (26%), cropland (19%), and grassland (14%), within 10 miles by water (70%) and trees (13%), and within 50 miles by water (85%).