December weather forecastSan Luis, Cuba

December

Weather in December

December ushers in the coolest average temperatures of the year in San Luis, between 20.2°C (68.4°F) to 28.3°C (82.9°F). Rainfall reduces further compared to November, reaching a low of 34mm (1.34") over 14.2 days. Cloud coverage hovers at 27%, slightly lower than the annual average. As the year approaches a close, daylight hours hit the annual low at 10.9 hours daily. Despite the lower temperatures and diminished rainfall, December retains a relative humidity of 82%, sustaining the city's overall moist climate.

Temperature

The start of December sees the average high-temperature at a still moderately hot 28.3°C (82.9°F), showing little difference from November's 28.8°C (83.8°F). An average nighttime temperature of 20.2°C (68.4°F) is noted in San Luis, Cuba, during the month of December.

Heat index

During December, the heat index is estimated at a tropical 33°C (91.4°F). Incorporate additional safety actions, heat cramps and heat exhaustion are possible. Long-term activity may induce heatstroke.
Records show heat index calculations are tailored for shaded regions and mild winds. Heat index values have the potential to be boosted by 15 Fahrenheit (8 Celsius) degrees due to direct sunlight.
Note: The heat index, also known as 'real feel' or 'apparent temperature', is found by incorporating humidity levels into the air temperature measurement. The influence of weather is personal, differing among individuals based on variations in body mass, stature, and the degree of physical exertion. Sunshine, when direct, has the potential to intensify weather effects, leading to an increase in the heat index by 15 Fahrenheit (8 Celsius) degrees. Heat index values are highly critical for babies and toddlers. Youths are typically more endangered than adults since they usually sweat less. Their larger skin surface concerning their smaller bodies and higher heat production due to activity further adds to their vulnerability.

Humidity

In December, the average relative humidity is 82%.

Rainfall

In San Luis, in December, it is raining for 14.2 days, with typically 34mm (1.34") of accumulated precipitation. In San Luis, during the entire year, the rain falls for 242.5 days and collects up to 898mm (35.35") of precipitation.

Daylight

With an average of 10h and 54min of daylight, December has the shortest days of the year.
On the first day of December, sunrise is at 06:22 and sunset at 17:22. On the last day of the month, sunrise is at 06:38 and sunset at 17:34 CST.

Sunshine

In San Luis, the average sunshine in December is 7h.

UV index

January through April, October through December, with an average maximum UV index of 6, are months with the lowest UV index. A UV Index of 6 to 7 symbolizes a high health risk from unprotected exposure to Sun's UV rays for the average person.
Note: A typical high UV index of 6 in December suggests the following recommendations:
Exercise precautions and adapt sun safety practices. Defence against skin and eye affliction is paramount. Between 10 a.m. and 4 p.m., the Sun emits the most powerful UV radiation. Limit direct exposure to the Sun during these hours. Employ a wide-brim hat for potent defense against up to 50% of UV rays.

Updated: Jul 20, 2024
Published by: Weather Atlas | About Us
Data Sources | Weather Forecasting & Climate

Frequently asked questions

The average high-temperature, in December, in San Luis, is 28.3°C (82.9°F), while the average low-temperature is 20.2°C (68.4°F). In December, the average heat index (a.k.a. 'real feel', 'feels like'), which takes the relative humidity and factors it into the air temperature reading, is estimated at 33°C (91.4°F).

In San Luis, the average relative humidity in December is 82%.

In San Luis, during December, the rain falls for 14.2 days and regularly aggregates up to 34mm (1.34") of precipitation.

The month with the shortest days is December, with an average of 10h and 54min of daylight.

In December, the average day length is 10h and 56min.

In December, on the first day of the month, sunrise is at 06:22 and sunset at 17:22. On the last day of the month, sunrise is at 06:38 and sunset at 17:34 CST.

In December, the average sunshine duration is 7h.

The months with the lowest UV index in San Luis are January through April, October through December, with an average maximum UV index of 6.

The average daily maximum UV index in December is 6. A UV Index of 6 to 7 symbolizes a high health vulnerability from 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

28.8°C

28.3°C

27.8°C

Average low temperature

Average pressure

Average wind speed

Average max. wind speed

7.3km/h

8.1km/h

8.3km/h

Average wind speed gusts

Average humidity

Average rainfall

Average rainfall days

Average daylight

Average sunshine

Average sunshine days

6.7

13.3

Average UV index

Average cloud cover

Average visibility

Average temperature in December
San Luis, Cuba

Average high temperature in December: 28.3°C

The warmest months (with the highest average high temperature) are July and August (31.8°C).
The month with the lowest average high temperature is January (27.8°C).

Average low temperature in December: 20.2°C

The month with the highest average low temperature is August (23.1°C).
The coldest months (with the lowest average low temperature) are January and February (19.3°C).

Average pressure in December
San Luis, Cuba

Average pressure in December: 1015.5mbar

The month with the highest atmospheric pressure is January (1016.6mbar).
The month with the lowest atmospheric pressure is October (1012.1mbar).

Average wind speed in December
San Luis, Cuba

Average wind speed in December: 7.4km/h

The windiest month (with the highest average wind speed) is February (7.5km/h).
The calmest month (with the lowest average wind speed) is September (5.4km/h).

Average humidity in December
San Luis, Cuba

Average humidity in December: 82%

The months with the highest relative humidity are October and November (83%).
The month with the lowest relative humidity is March (76%).

Average rainfall in December
San Luis, Cuba

Average rainfall in December: 34mm

The wettest month (with the highest rainfall) is May (133mm).
The driest month (with the least rainfall) is February (20mm).

Average rainfall days in December
San Luis, Cuba

Average rainfall days in December: 14.2 days

The months with the highest number of rainy days are September and October (26.5 days).
The month with the least rainy days is February (11.3 days).

Average daylight in December /
Average sunshine in December
San Luis, Cuba

Average daylight in December: 10h and 54min

The month with the longest days is June (Average daylight: 13h and 18min).
The month with the shortest days is December (Average daylight: 10h and 54min).

Average sunshine in December: 7h and 0min

The month with the most sunshine is July (Average sunshine: 11h and 24min).
The month with the least sunshine is November (Average sunshine: 6h and 48min).

Average sunshine days in December
San Luis, Cuba

Average sunshine days in December: 13 days

The month with the most sunshine days is February (13.5 days).
The month with the least sunshine days is September (2.4 days).

Average UV index in December
San Luis, Cuba

Average UV index in December: 6

The months with the highest UV index are May, June, July, August and September (UV index 7).
The months with the lowest UV index are January, February, March, April, October, November and December (UV index 6).