December weather forecast
Puerto Rico, Bolivia

The first month of the summer, December, is still a tropical month in Puerto Rico, Bolivia, with an average temperature varying between 22.3°C (72.1°F) and 30.1°C (86.2°F).

Temperature

The transition from November to December brings an average high-temperature of a still hot 30.1°C (86.2°F), barely different from November's 32.2°C (90°F). During the month of December, the temperature generally drops to a low average of 22.3°C (72.1°F).

Heat index

The heat index for December is appraised at a blistering 40°C (104°F). Adopt enhanced safety measures, heat exhaustion and heat cramps could occur. Continuous activity may induce heatstroke.
Heat index values are typically calculated for conditions of shade and a light breeze. Heat index values may rise by up to 15 Fahrenheit (8 Celsius) degrees when exposed to direct sunlight.
Note: The heat index, also known as 'real feel' or 'felt air temperature', gives an indication of how one might feel in terms of heat after considering humidity. An individual's perception of weather can be influenced by a variety of factors including metabolic differences, being pregnant, and their degree of physical exertion. It is noteworthy that being in direct sunlight can enhance the weather's impact, raising the heat index by as much as 15 Fahrenheit (8 Celsius) degrees. Heat index values hold great significance to children. Young individuals usually face more risks than adults due to their lower sweat production. Their large skin surface area relative to their tiny bodies and high heat production from their activities adds to their risk.
Through perspiration, the body has a natural mechanism to eliminate excessive heat via sweat evaporation. Elevated relative humidity disrupts typical body cooling by reducing the evaporation rate, consequently decreasing the body's cooling rate and enhancing the feeling of heat. Heat-related challenges, like dehydration, can be anticipated when body heat isn't managed effectively.

Humidity

The average relative humidity in December is 87%.

Rainfall

In December, the rain falls for 26.4 days. Throughout December, 180mm (7.09") of precipitation is accumulated. In Puerto Rico, during the entire year, the rain falls for 233.4 days and collects up to 1251mm (49.25") of precipitation.

Daylight

The month with the longest days is December, with an average of 12h and 48min of daylight.
On the first day of December, sunrise is at 05:57 and sunset at 18:41. On the last day of the month, sunrise is at 06:10 and sunset at 18:56 -04.

Sunshine

In December, the average sunshine in Puerto Rico, Bolivia, is 6.2h.

UV index

January through June and December, with an average maximum UV index of 6, are months with the lowest UV index in Puerto Rico, Bolivia. A UV Index reading of 6 to 7 represents a high health vulnerability from exposure to the Sun's UV radiation for average individuals.
Note: The daily maximum UV index of 6 in December interprets into the following advice:
Undertake precautions and comply with sun safety standards. Protection from skin and eye injury is vital. Avoid direct sunlight between the hours of 10 a.m. and 4 p.m., when UV radiation is at its peak. Keep in mind that shade structures may not provide complete protection. Sunglasses providing both UVA and UVB protection are non-negotiable on sunlit days.