December weather forecast
Sullana, Peru

December signals the onset of Sullana's high precipitation period with rainfall edging up to 4mm (0.16"). These conditions accompanied by 30.8°C (87.4°F) day temperature and 21°C (69.8°F) night temperature provide a warm and moderately high-humidity environment, typical of a tropical climate. The city witnesses a slight rise in the average relative humidity to 62%. With over twenty-five days of clear skies and more than nine hours of sunshine, December offers a mixed bag for being outdoors.

Temperature

Entering December, Sullana's average high-temperature reads a still tropical 30.8°C (87.4°F), indicating a close resemblance to the previous month's climate. Sullana throughout December, records an average low-temperature of 21°C (69.8°F).

Heat index

In December, the heat index is estimated at a fiery hot 35°C (95°F). Ensure additional precautions, heat exhaustion and heat cramps may be expected. Heatstroke could occur from sustained activity.
Note that heat index values are valued for light wind and location in the shade. Heat index values can rise by 15 Fahrenheit (8 Celsius) degrees when in direct sunlight.
Note: The heat index, also known as 'apparent temperature' or 'feels like', gauges the sensation of temperature factoring in the air's moisture content. The influence of weather is personal, with a diverse population experiencing it differently due to differences in body mass, stature, and degree of activity. Keep it in mind, direct sunlight can augment the heat you experience, possibly pushing the heat index up by 15 Fahrenheit (8 Celsius) degrees. Heat index values are highly critical to babies and toddlers. Children often miss understanding the importance of rest and rehydration. Thirst usually appears late during dehydration - therefore, maintaining hydration, particularly during long physical activities, is essential.
Sweat evaporation plays a crucial role in cooling the human body, a process enabled by perspiration. High relative humidity reduces the evaporation rate, resulting in a lower heat removal rate from the body, causing the perception of being overheated. Heat disorders may be on the horizon when body temperatures rise from inadequate heat management.

Humidity

In December, the average relative humidity in Sullana, Peru, is 62%.

Rainfall

In December, in Sullana, the rain falls for 4.3 days. Throughout December, 4mm (0.16") of precipitation is accumulated. In Sullana, during the entire year, the rain falls for 69 days and collects up to 158mm (6.22") of precipitation.

Daylight

The month with the longest days in Sullana is December, with an average of 12h and 24min of daylight.
On the first day of the month, sunrise is at 06:00 and sunset at 18:23. On the last day of December, in Sullana, Peru, sunrise is at 06:13 and sunset at 18:38 -05.

Sunshine

The average sunshine in December in Sullana is 9.5h.

UV index

The months with the highest UV index in Sullana are January through May and December, with an average maximum UV index of 7. A UV Index of 6 to 7 symbolizes a high health vulnerability from exposure to the Sun's UV rays for the average person.
Note: In December, the maximum UV index of 7 translates into these guidelines:
Escape overexposure. People with light skin may incur burns in fewer than 20 minutes. Limit your exposure to the sun's UV radiation, which is strongest between 10 a.m. and 4 p.m., and note that parasols or canopies may not provide full sun protection. Arm yourself against UV rays' harm with protective apparel and UV-filtering shades.