December weather forecast
Valle de San Juan, Colombia

December, the first month of the winter in Valle de San Juan, is still a hot month, with an average temperature varying between 18°C (64.4°F) and 33.6°C (92.5°F).

Temperature

With the arrival of December, Valle de San Juan's average high-temperature registers at a still hot 33.6°C (92.5°F), indicating a subtle variation from the previous month. Valle de San Juan endures a clear shift from daytime heat to a mean low-temperature of 18°C (64.4°F) during December nights.

Heat index

The average heat index in December is calculated to be a blistering 41°C (105.8°F). Undertake additional safety actions, risk of heat cramps and heat exhaustion is significant. Persistent activity may induce heatstroke.
From a standpoint of the heat index, values pertain to shaded conditions and mild breezes. The heat index has the possibility to be enhanced by 15 Fahrenheit (8 Celsius) degrees when there is direct sun exposure.
Note: The heat index, also known as 'felt air temperature' or 'feels like', integrates the air's temperature and its humidity to showcase the felt temperature by people. One's perception of weather can be shaped by other factors, involving metabolic differences, pregnancy, and physical exertion. When directly under the sun, the weather's impact can intensify, possibly boosting the heat index by 15 Fahrenheit (8 Celsius) degrees. Heat index values are especially vital to children. Young ones are generally more prone to risk than adults due to their reduced ability to sweat. Their large skin surface area relative to their diminutive bodies and elevated heat production from their activities further enhance this risk.
One way the human body deals with excessive warmth is by perspiring and allowing sweat to evaporate. Greater relative humidity lessens the rate of evaporation, thus decreasing the body's heat dispersal, which gives rise to a sensation of overheating. Heat-related challenges, like dehydration, can be anticipated when body heat isn't managed effectively.

Humidity

In December, the average relative humidity is 60%.

Rainfall

In Valle de San Juan, in December, during 12.2 rainfall days, 56mm (2.2") of precipitation is typically accumulated. In Valle de San Juan, during the entire year, the rain falls for 211.1 days and collects up to 802mm (31.57") of precipitation.

Daylight

With an average of 11h and 54min of daylight, December has the shortest days of the year.
On the first day of December, sunrise is at 05:52 and sunset at 17:46. On the last day of the month, sunrise is at 06:07 and sunset at 18:00 -05.

Sunshine

The month with the least sunshine is December, with an average of 8.4h of sunshine.

UV index

The months with the lowest UV index are May, June, November and December, with an average maximum UV index of 6. A UV Index reading of 6 to 7 represents a high health risk from unsafe exposure to UV radiation for average individuals.
Note: In December, a daily UV index of 6 turns into the following recommendations:
Exercise precautions and adapt sun safety practices. Defence against skin and eye affliction is paramount. Remember that UV radiation from the Sun is strongest between 10 a.m. and 4 p.m. Make an effort to limit direct sun exposure during this time. A wide-brim hat offers excellent sun protection for the eyes, ears, face, and neck. Sunglasses with UVA and UVB protection significantly reduce eye damage from sun exposure.