December weather forecastGrace, Saint Lucia

December

Weather in December

December in Grace, Saint Lucia witnesses a decrease in temperature and rainfall compared to November. Wind speed increases slightly, and daylight hours decrease as winter months set in. Despite lower temperatures, December continues to offer warm conditions suitable for beach activities. The weather data indicates the lowest average minimum temperature in December, around 26.2°C (79.2°F). Transitioning into the new year, December's weather trends continue into January, maintaining similar temperature averages and rainfall.

Temperature

The onset of December notes an average high-temperature of a still warm 27.9°C (82.2°F), subtly shifted from November's 28.7°C (83.7°F). Nights in December showcase an average temperature of 26.2°C (79.2°F), slightly cooler than the daytime.

Heat index

In December, the average heat index is computed to be a tropical 31°C (87.8°F). Unrelenting activity during exposure could cause fatigue and potentially lead to heat cramps.
Understanding the heat index involves considering values for shaded locales with light wind. Under direct sunshine, the heat index values might be elevated by 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'real feel' or 'felt air temperature', offers an insight into how hot it feels when we factor in moisture content. An individual's temperature experience can be influenced by extra factors, including metabolic differences, activity levels, and clothing. Direct sun rays have a notable impact on perceived temperature, which can raise the heat index by up to 15 Fahrenheit (8 Celsius) degrees. Heat index values are extremely significant for babies and toddlers. Children frequently do not understand the need for recuperation and hydration. Thirst, being a late manifestation of dehydration, underlines the need to hydrate frequently, especially when engaging in prolonged physical exercises.

Humidity

In December, the average relative humidity in Grace is 75%.

Rainfall

In Grace, Saint Lucia, in December, it is raining for 18.7 days, with typically 37mm (1.46") of accumulated precipitation. In Grace, during the entire year, the rain falls for 232.4 days and collects up to 542mm (21.34") of precipitation.

Daylight

The month with the shortest days is December, with an average of 11h and 18min of daylight.
On the first day of December, sunrise is at 06:11 and sunset at 17:34. On the last day of the month, sunrise is at 06:27 and sunset at 17:47 AST.

Sunshine

December has the least sunshine of the year in Grace, with an average of 6.6h of sunshine.

UV index

The months with the highest UV index are January through December, with an average maximum UV index of 7. The months with the lowest UV index are January through December, with an average maximum UV index of 7. A UV Index value of 6 to 7 symbolizes a high health vulnerability from exposure to the Sun's UV rays for ordinary individuals.
Note: The average daily UV index of 7 in December transforms into the following instructions:
Avoid excessive sunlight. Those with lighter skin may experience burning in less than 20 minutes. The Sun's UV radiation is at its strongest between the hours of 10 a.m. and 4 p.m. Minimize direct exposure to the sun during this period. To best shield against UV radiation, choose sun-safe garments and dependable sunglasses.

Updated: Jan 31, 2024
Published by: Weather Atlas | About Us
Data Sources | Weather Forecasting & Climate

Frequently asked questions

The average high-temperature and low-temperature during December are 27.9°C (82.2°F) and 26.2°C (79.2°F) respectively. The average heat index (a.k.a. 'apparent temperature', 'feels like'), which factors the actual air temperature with the relative humidity, in December is computed to be 31°C (87.8°F).

In Grace, the average relative humidity in December is 75%.

In Grace, Saint Lucia, in December, during 18.7 rainfall days, 37mm (1.46") of precipitation is typically accumulated.

The month with the shortest days in Grace is December, with an average of 11h and 18min of daylight.

In Grace, Saint Lucia, the average day length in December is 11h and 20min.

In December, on the first day of the month, sunrise is at 06:11 and sunset at 17:34. On the last day of the month, in Grace, Saint Lucia, sunrise is at 06:27 and sunset at 17:47 AST.

The month with the least sunshine in Grace is December, with an average of 6.6h of sunshine.

In Grace, the average sunshine duration in December is 6.6h.

January through December, with an average maximum UV index of 7, are months with the highest UV index in Grace.

The months with the lowest UV index in Grace are January through December, with an average maximum UV index of 7.

In December, the average daily maximum UV index in Grace is 7. A UV Index reading of 6 to 7 represents a high health risk from unsafe exposure to Sun's UV rays.

Today

Tomorrow

Long-term

Year J F M A M J J A S O N December

Nov

December

Jan

Average high temperature

28.7°C

27.9°C

27.1°C

Average low temperature

Average pressure

Average wind speed

Average max. wind speed

22.4km/h

25.5km/h

27.3km/h

Average wind speed gusts

Average humidity

Average rainfall

Average rainfall days

Average daylight

Average sunshine

Average sunshine days

6.2

Average UV index

Average cloud cover

41%

37%

Average visibility

10km

Average temperature in December
Grace, Saint Lucia

Average high temperature in December: 27.9°C

The warmest months (with the highest average high temperature) are September and October (29.5°C).
The month with the lowest average high temperature is February (26.8°C).

Average low temperature in December: 26.2°C

The month with the highest average low temperature is September (27.6°C).
The coldest month (with the lowest average low temperature) is February (25.3°C).

Average pressure in December
Grace, Saint Lucia

Average pressure in December: 1013.2mbar

The month with the highest atmospheric pressure is June (1014.9mbar).
The month with the lowest atmospheric pressure is November (1011.3mbar).

Average wind speed in December
Grace, Saint Lucia

Average wind speed in December: 24.9km/h

The windiest month (with the highest average wind speed) is February (26.9km/h).
The calmest month (with the lowest average wind speed) is September (18.3km/h).

Average humidity in December
Grace, Saint Lucia

Average humidity in December: 75%

The month with the highest relative humidity is July (77%).
The months with the lowest relative humidity are January and February (74%).

Average rainfall in December
Grace, Saint Lucia

Average rainfall in December: 37mm

The wettest month (with the highest rainfall) is October (73mm).
The driest month (with the least rainfall) is February (18mm).

Average rainfall days in December
Grace, Saint Lucia

Average rainfall days in December: 18.7 days

The month with the highest number of rainy days is July (23.3 days).
The month with the least rainy days is February (15 days).

Average daylight in December /
Average sunshine in December
Grace, Saint Lucia

Average daylight in December: 11h and 18min

The month with the longest days is June (Average daylight: 12h and 54min).
The month with the shortest days is December (Average daylight: 11h and 18min).

Average sunshine in December: 6h and 36min

The month with the most sunshine is August (Average sunshine: 10h and 24min).
The month with the least sunshine is December (Average sunshine: 6h and 36min).

Average sunshine days in December
Grace, Saint Lucia

Average sunshine days in December: 9 days

The month with the most sunshine days is March (9.1 days).
The month with the least sunshine days is July (3.6 days).

Average UV index in December
Grace, Saint Lucia

Average UV index in December: 7

The months with the highest UV index are January, February, March, April, May, June, July, August, September, October, November and December (UV index 7).
The months with the lowest UV index are January, February, March, April, May, June, July, August, September, October, November and December (UV index 7).

Average cloud cover in December
Grace, Saint Lucia

Average cloud cover in December: 41

The month with the most cloud cover is June (Cloud cover 46).
The month with the least cloud cover is February (Cloud cover 35).

Average visibility in December
Grace, Saint Lucia

Average visibility in December: 10km

The months with the highest visibility are January, February, March, April, May, June, July, August, September, October, November and December (10km).
The months with the lowest visibility are January, February, March, April, May, June, July, August, September, October, November and December (10km).