Port Moresby
Papua New Guinea
Long-term weather forecast
Long-term weather forecast

December weather forecast and climate
Port Moresby, Papua New Guinea

The mountains and beautiful clear waters surrounding the beautiful Port Moresby, in Papua New Guinea
The mountains and beautiful clear waters surrounding the beautiful Port Moresby, in Papua New Guinea
The first month of the summer, December, is still a tropical month in Port Moresby, Papua New Guinea, with average temperature ranging between max 32.4°C (90.3°F) and min 23.7°C (74.7°F).

Temperature

In Port Moresby, the average high-temperature is practically the same as in November - a still tropical 32.4°C (90.3°F). In December, the average low-temperature is 23.7°C (74.7°F).

Heat index

The average heat index is appraised at a blistering 44.5°C (112.1°F). Be wary - heat exhaustion and heat cramps are highly anticipated. With continued activity, heatstroke is very likely.
Take into consideration that the heat index values are calculated for shade and light wind conditions. With the exposure to direct sunlight, the heat index may be increased by up to 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'feels like', 'real feel', 'apparent temperature', or 'felt air temperature', is what the temperature feels like to the human body when the air temperature is combined with the relative humidity. Additional factors like clothing, pregnancy, wind, and activity influence one's weather impression. Bear in mind that direct sunshine exposure increases weather impact, and may raise heat index by up to 15 Fahrenheit (8 Celsius) degrees. Heat index values are particularly important for children. Children are often less aware of the need to rest and re-hydrate. Thirst is a late sign of dehydration - it is vital to remain hydrated, particularly during prolonged physical activities.
The human body cools itself through perspiration, as excessive warmth is removed from the body through sweat evaporation. With a lot of moisture in the air, the evaporation process is not as effective, and the body does not cool down as efficiently, creating a perception of overheating. When heat gain surpasses the level the body can shed, body temperature begins to increase, and consequently, overheating and dehydration can occur, with varying severity.

Humidity

In December, the average relative humidity is 77%.

Rainfall

In December, in Port Moresby, Papua New Guinea, the rain falls for 12 days. Throughout December, 97.8mm (3.9") of precipitation is accumulated. In Port Moresby, during the entire year, the rain falls for 114 days and collects up to 898.8mm (35.4") of precipitation.

Sea temperature

In December, the average sea temperature in Port Moresby is 29.3°C (84.7°F).
Note: For any water activity, surface water temperatures between 25°C (77°F) and 29°C (84.2°F) are considered as excellent and extremely pleasant for lengthened periods.

Daylight

The month with the longest days in Port Moresby is December, with an average of 12.7h of daylight.

Sunshine

The average sunshine in Port Moresby is 7h.

UV index

January through April, August through December, with an average maximum UV index of 12, are months with the highest UV index in Port Moresby. A UV Index of 11, and more, symbolizes an extreme health hazard from unsafe exposure to the UV radiation for ordinary individuals.
Note: The average daily UV index of 12 transform into the following instructions:
Take all required precautions, as unprotected skin and eyes can burn in minutes. Seek shade and minimize exposure to direct Sun in a period between 10 a.m. and 4 p.m. when UV radiation is most intense; keep in mind that shade structures like parasols or canopies do not provide perfect sun protection. 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. A broad-spectrum sunscreen of SPF 30+ should be liberally applied and re-applied every two hours, and immediately after an outdoor workout or a swim. Caution! The reflection of sand and water significantly increases the intensity of the Sun's UV radiation.

What is the temperature in December in Port Moresby?

In December, in Port Moresby, the average high-temperature is 32.4°C (90.3°F), and the average low-temperature is 23.7°C (74.7°F). The average heat index (a.k.a. 'feels like', 'apparent temperature'), that takes the relative humidity and factores it into the air temperature reading, in December is appraised at 44.5°C (112.1°F).

What is the average humidity in December in Port Moresby?

The average relative humidity in December in Port Moresby is 77%.

How many days does it rain in December in Port Moresby?

In Port Moresby, in December, during 12 rainfall days, 97.8mm (3.9") of precipitation is typically accumulated.

How warm is the water in December in Port Moresby?

In Port Moresby, Papua New Guinea, the average seawater temperature in December is 29.3°C (84.7°F). Water temperature between 25°C (77°F) and 29°C (84.2°F) is regarded as very warm and enjoyable by all. With these temperatures, water activities are pleasurable, without feeling uncomfortable for prolonged periods.

When are the longest days in Port Moresby?

With an average of 12.7h of daylight, December has the longest days of the year in Port Moresby.

What is the average length of the day in December in Port Moresby?

In December, the average length of the day in Port Moresby, Papua New Guinea, is 12.7h.

How long on average sun shines in December in Port Moresby?

In Port Moresby, the average sunshine in December is 7h.

When is the highest UV index in Port Moresby?

Months with the highest UV index in Port Moresby are January through April, August through December, with an average maximum UV index of 12.

What is the UV index intensity in December in Port Moresby?

In December, the average daily maximum UV index is 12. A UV Index reading of 11, and higher, represents an ultimate hazard to health from the exposure to the Sun's UV rays.
Average temperature in December - Port Moresby, Papua New Guinea
  • Average high temperature in December: 32.4°C

The warmest month (with the highest average high temperature) is November (32.5°C).
The month with the lowest average high temperature is July (29.9°C).

  • Average low temperature in December: 23.7°C

Months with the highest average low temperature are January and December (23.7°C).
The coldest month (with the lowest average low temperature) is July (22.4°C).

Average humidity in December - Port Moresby, Papua New Guinea
  • Average humidity in December: 77%

The month with the highest relative humidity is April (82%).
The month with the lowest relative humidity is November (75%).

Average rainfall in December - Port Moresby, Papua New Guinea
  • Average rainfall in December: 97.8mm

The wettest month (with the highest rainfall) is January (192.2mm).
The driest month (with the lowest rainfall) is August (12mm).

Average rainfall days in December - Port Moresby, Papua New Guinea
  • Average rainfall days in December: 12 days

Months with the highest number of rainy days are January and March (18 days).
Months with the lowest number of rainy days are July and August (4 days).

Average sea temperature in December - Port Moresby, Papua New Guinea
  • Average sea temperature in December: 29.3°C

The best month for swimming (with the highest average sea temperature) is January (29.7°C).
The coldest month (with the lowest average sea temperature) is August (25.6°C).

Average daylight in December / Average sunshine in December - Port Moresby, Papua New Guinea
  • Average daylight in December: 12.7h

The month with the longest days is December (Average daylight: 12.7h).
Months with shortest days are June and July (Average daylight: 11.6h).

  • Average sunshine in December: 7h

The month with most sunshine is November (Average sunshine: 8.1h).
The month with least sunshine is February (Average sunshine: 5.6h).

Average UV index in December - Port Moresby, Papua New Guinea
  • Average UV index in December: 12

Months with the highest UV index are January, February, March, April, August, September, October, November and December (UV index 12).
The month with the lowest UV index is June (UV index 9).