Castries City
Saint Lucia
Long-term weather forecast
Long-term weather forecast

December weather forecast and climate
Castries City, Saint Lucia

A high scenic panorama of the beautiful city of Castries, Saint Lucia
A high scenic panorama of the beautiful city of Castries, Saint Lucia
The first month of the winter, December, is also a moderately hot month in Castries City, Saint Lucia, with average temperature varying between 28°C (82.4°F) and 22°C (71.6°F).

Temperature

January through March and December, with an average high-temperature of 28°C (82.4°F), are the coldest months.

Rainfall

In December, the rain falls for 18 days. Throughout December, 176mm (6.9") of precipitation is accumulated. In Castries City, during the entire year, the rain falls for 208 days and collects up to 2377mm (93.6") of precipitation.

Sea temperature

In Castries City, the average seawater temperature in December is 27°C (80.6°F).
Note: For any water activity, surface water temperatures between 25°C (77°F) and 29°C (84.2°F) are considered as excellent and extremely pleasant for lengthened periods.

Daylight

The month with the shortest days in Castries City is December, with an average of 11.3h of daylight.

Sunshine

January through September, November and December, with an average of 8h of sunshine, are months with the most sunshine.

UV index

December is the month with the lowest UV index in Castries City, with an average maximum UV index of 8. A UV Index reading of 8 to 10 represents a very high health vulnerability from the exposure to the Sun's UV radiation for average individuals.
Note: In December, the average maximum UV index of 8 translate into the following recommendations:
Take extra precautions. Protection against sun damage is required. Seek shade and minimize exposure to direct Sun in a period between 10 a.m. and 4 p.m. when UV radiation is most intense; keep in mind that shade structures like parasols or canopies do not provide perfect sun protection. On bright days sunglasses that block both UVA and UVB rays should be worn. A hat with a wide brim is extremely helpful, as it can prevent roughly 50% of UV radiation from reaching the eyes. Beware! The strength of the UV rays is significantly increased by the reflection of the water and sand.

What is the coldest month in Castries City?

The coldest months are January through March and December, with an average high-temperature of 28°C (82.4°F).

What is the temperature in December in Castries City?

In Castries City, Saint Lucia, in December, the average high-temperature is 28°C (82.4°F), and the average low-temperature is 22°C (71.6°F).

How many days does it rain in December in Castries City?

In December, the rain falls for 18 days. Throughout December, 176mm (6.9") of precipitation is accumulated.

How warm is the water in December in Castries City?

In December, the average sea temperature in Castries City is 27°C (80.6°F). For swimming, diving, and other water activities, temperatures between 25°C (77°F) and 29°C (84.2°F) are perceived as very enjoyable and pleasurable for prolonged periods without feeling uncomfortable.

What is the month with the shortest days in Castries City?

With an average of 11.3h of daylight, December has the shortest days of the year in Castries City, Saint Lucia.

What is the average length of the day in December in Castries City?

In December, the average length of the day is 11.3h.

What are the months with the most sunshine in Castries City?

Months with the most sunshine in Castries City are January through September, November and December, with an average of 8h of sunshine.

How long on average sun shines in December in Castries City?

In Castries City, Saint Lucia, the average sunshine in December is 8h.

When is the lowest UV index in Castries City?

The month with the lowest UV index in Castries City is December, with an average maximum UV index of 8.

How high is the UV index in December in Castries City?

In December, the average daily maximum UV index in Castries City, Saint Lucia, is 8. A UV Index value of 8 to 10 symbolizes a very high health risk from unprotected exposure to the UV radiation.
Average temperature in December - Castries City, Saint Lucia
  • Average high temperature in December: 28°C

Warmest months (with the highest average high temperature) are May, June, July, August, September and October (30°C).
Months with the lowest average high temperature are January, February, March and December (28°C).

  • Average low temperature in December: 22°C

Months with the highest average low temperature are May, June, July, August and September (24°C).
Coldest months (with the lowest average low temperature) are January, February, March and December (22°C).

Average rainfall in December - Castries City, Saint Lucia
  • Average rainfall in December: 176mm

The wettest month (with the highest rainfall) is October (303mm).
The driest month (with the lowest rainfall) is March (99mm).

Average rainfall days in December - Castries City, Saint Lucia
  • Average rainfall days in December: 18 days

The month with the highest number of rainy days is September (24 days).
The month with the lowest number of rainy days is April (11 days).

Average sea temperature in December - Castries City, Saint Lucia
  • Average sea temperature in December: 27°C

Best months for swimming (with the highest average sea temperature) are September and October (29°C).
Coldest months (with the lowest average sea temperature) are February and March (26°C).

Average daylight in December / Average sunshine in December - Castries City, Saint Lucia
  • Average daylight in December: 11.3h

Months with the longest days are June and July (Average daylight: 12.9h).
The month with shortest days is December (Average daylight: 11.3h).

  • Average sunshine in December: 8h

Months with most sunshine are January, February, March, April, May, June, July, August, September, November and December (Average sunshine: 8h).
The month with least sunshine is October (Average sunshine: 7h).

Average UV index in December - Castries City, Saint Lucia
  • Average UV index in December: 8

Months with the highest UV index are March, April, May, June, July, August and September (UV index 12).
The month with the lowest UV index is December (UV index 8).