December weather forecast
Vanimo, Papua New Guinea

December brings the highest rainfall observed since January. The city experiences a significant rainfall of 219mm (8.62"), thereby bringing the year to a wet close. The temperature does not undergo any drastic changes, adhering to the overall annual trend. Sunlight hours and humidity levels remain consistent, setting the stage for a pleasant end to the year. December's weather offers a dynamic mix of warm, humid conditions and high rainfall, signifying an eventful closure of the year's weather narrative.

Temperature

Vanimo experiences a minor change to a still warm 28.9°C (84°F) in average high-temperature during December, closely reflecting November. Nights during December maintain a steady temperature, averaging at a still moderately hot 25.4°C (77.7°F).

Heat index

The heat index for December is computed to be a torrid 35°C (95°F). Take extra safety measures to prevent heat exhaustion and heat cramps. Heatstroke could follow lengthy activity.
Data suggests that the heat index is set for environments in shade and with a light wind. Direct exposure to sunshine could lead to a heat index increase by 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'feels like' or 'apparent temperature', binds temperature metrics with humidity values to give a sense of the actual warmth. Factors encompassing physical activity, clothing, and metabolic differences have a role in shaping the individual's impression of temperature. Direct sunlight exposure should be noted as it has the potential to increase the heat index by 15 Fahrenheit (8 Celsius) degrees. Heat index values hold great significance to children. Young people are generally more susceptible than adults because they perspire less. Furthermore, their proportionally larger skin surface to their petite bodies and the increased heat output from their actions add to the risk.
In high temperatures, perspiration kicks in, allowing the human body to cool down through the evaporation of sweat. In the presence of elevated relative humidity, the evaporation rate decreases. This reduction leads to increased body heat retention compared to conditions of dry air. Elevated heat gain compared to the body's release capability poses risks of dehydration and potential overheating.

Humidity

In Vanimo, the average relative humidity in December is 81%.

Rainfall

The month with the most rainfall is December, when the rain falls for 26.8 days and typically aggregates up to 219mm (8.62") of precipitation.

Sea temperature

In Vanimo, Papua New Guinea, in December, the average water temperature is 29.3°C (84.7°F).
Note: Swimming, diving, and other activities in water temperatures between 25°C (77°F) and 29°C (84.2°F) are thought to be quite enjoyable and satisfying for extended periods, with no discomfort.

Daylight

December has the longest days of the year, with an average of 12h and 18min of daylight.
On the first day of the month, sunrise is at 06:15 and sunset at 18:31. On the last day of December, sunrise is at 06:29 and sunset at 18:46 +10.

Sunshine

In December, the average sunshine is 7.9h.

UV index

January and December, with an average maximum UV index of 6, are months with the lowest UV index. A UV Index reading of 6 to 7 represents a high threat to health from exposure to the Sun's UV radiation for ordinary individuals.
Note: A maximum UV index of 6 in December translates into the following recommendations:
Dodge overexposure. Fair-skinned people can get singed in less than 20 minutes. Remember that the sun's UV radiation is strongest between 10 a.m. and 4 p.m. Make an effort to avoid direct sun exposure during these hours. On bright days sunglasses that block both UVA and UVB rays should be worn. A hat with a wide brim is extremely helpful, as it can prevent roughly 50% of UV radiation from reaching the eyes. Note! The Sun's UV radiation gets intensified with the reflection from sand and water.