December weather forecast
Rivera, Uruguay

December in Rivera is a gateway to the hot season. The mercury touches a high of 29.4°C (84.9°F), intensifying the summer conditions. Despite the heat, Rivera is blessed with about 14.1 hours of daylight making days longer. December ushers in the Christmas celebrations under the glaring Uruguayan sun. The weather bidding adieu to the year sets an anticipated prelude to another cycle of Rivera's dynamic weather pattern commencing from January.

Temperature

Rivera ushers in December with an average high-temperature of a still warm 29.4°C (84.9°F), showing a close resemblance to the previous month. Rivera registers a significant drop in temperature in December, with average nighttime lows of 17°C (62.6°F).

Heat index

The heat index value during December is calculated to be a hot 33°C (91.4°F). Incorporate additional preventive steps, heat exhaustion and heat cramps are possible. Long-lasting activity may cause heatstroke.
Note that heat index values are valued for light wind and location in the shade. An exposure to direct sunlight may lift the heat index values by 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'apparent temperature' or 'real feel', is an estimation of the warmth sensation when considering humidity levels. The effect is personal, with varied weather perceptions among individuals due to differences in body mass, stature, and physical activity. Being aware that direct sunlight can impact the felt heat might mean an increase in the heat index by 15 Fahrenheit (8 Celsius) degrees. Heat index values are quite important for babies and toddlers. Children often lack awareness of the importance of taking breaks and rehydrating. The feeling of thirst is a late indication of dehydration, so maintaining hydration, especially during long periods of physical activity, is critical.

Humidity

The least humid month is December, with an average relative humidity of 66%.

Rainfall

In Rivera, Uruguay, during December, the rain falls for 12.4 days and regularly aggregates up to 84mm (3.31") of precipitation. In Rivera, during the entire year, the rain falls for 133.2 days and collects up to 920mm (36.22") of precipitation.

Daylight

The month with the longest days is December, with an average of 14h and 6min of daylight.
On the first day of the month, sunrise is at 05:31 and sunset at 19:31. On the last day of December, in Rivera, sunrise is at 05:42 and sunset at 19:48 -03.

Sunshine

The month with the most sunshine is December, with an average of 10.2h of sunshine.

UV index

The months with the highest UV index are January through March, November and December, with an average maximum UV index of 6. A UV Index estimate of 6 to 7 represents a high health hazard from exposure to the Sun's UV rays for the ordinary person.
Note: The daily high UV index of 6 in December translates into this advice:
Sustain precautions and conform to sun safety norms. Preventing sunburn is necessary. Avoid direct Sun exposure and seek shade between 10 a.m. and 4 p.m., when UV radiation is at its peak, but keep in mind that not all shade structures provide complete protection. For excellent sun protection for the eyes, ears, face, and neck, consider a wide-brim hat.