December weather forecast
Manchester, Bolivia

December, the first month of the summer in Manchester, is also a hot month, with an average temperature fluctuating between 30°C (86°F) and 21.9°C (71.4°F).

Temperature

With December's arrival, Manchester's weather records an average high-temperature of a still hot 30°C (86°F), marking little difference from November's 31.7°C (89.1°F). An average low-temperature of 21.9°C (71.4°F) is noted during the month of December.

Heat index

During December, the heat index is calculated to be a sweltering 39°C (102.2°F). Special measures are necessary to avoid heat cramps and heat exhaustion. Persistent activity could result in heatstroke.
Know that the heat index computations account for shaded terrains and slight winds. Direct sunlight has the potential to heighten heat index values by 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'feels like' or 'apparent temperature', combines both the air temperature and the humidity level to give a perceived human temperature. An individual's perception of weather can be swayed by a variety of elements including metabolic differences, pregnancy status, and their level of physical exertion. Awareness is key; direct sunlight can enhance the weather's impact, possibly boosting the heat index by up to 15 Fahrenheit (8 Celsius) degrees. Heat index values are extremely vital to 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.
Evaporating sweat, thanks to perspiration, acts as a natural air conditioner for the human body. Augmented relative humidity impedes typical body cooling mechanisms by lowering the evaporation rate, resulting in decreased body cooling and an amplified perception of heat. When heat surpasses the body's release mechanisms, dehydration and overheating risks become pronounced.

Humidity

The average relative humidity in December is 84%.

Rainfall

In December, the rain falls for 28.4 days. Throughout December, 156mm (6.14") of precipitation is accumulated. In Manchester, Bolivia, during the entire year, the rain falls for 253 days and collects up to 1428mm (56.22") of precipitation.

Daylight

With an average of 12h and 48min of daylight, December has the longest days of the year.
On the first day of December, sunrise is at 05:58 and sunset at 18:44. On the last day of the month, sunrise is at 06:11 and sunset at 18:59 -04.

Sunshine

In December, the average sunshine is 6.6h.

UV index

The months with the lowest UV index are January through June, November and December, with an average maximum UV index of 6. A UV Index estimate of 6 to 7 represents a high health vulnerability from exposure to the Sun's UV rays for average individuals.
Note: In December, the maximum UV index of 6 suggests these recommendations:
Stick with precautions and abide by sun safety procedures. Evading sunburn is essential. Seek shade and limit direct sun exposure between 10 a.m. and 4 p.m., the peak period for UV radiation. Keep in mind that shade structures like parasols or canopies do not offer complete sun protection. In bright sunlight, prioritize sunglasses that grant protection from UVA and UVB radiation.