December weather forecast
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

Weather in December

December, the first month of the summer, in Port Moresby, is a hot month, with temperature in the range of an average low of 24.5°C (76.1°F) and an average high of 30.2°C (86.4°F).

Temperature

With an average high-temperature of 30.2°C (86.4°F) and an average low-temperature of 24.5°C (76.1°F), December is the warmest month.

Heat index

The average heat index is evaluated at a very hot 36.9°C (98.4°F). Take special precautions - heat exhaustion and heat cramps are expected. Heatstroke may occur with lengthy activity.
Take into consideration that the heat index values are calculated for shade and light wind conditions. With 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 'felt air temperature', 'apparent temperature', 'real feel', or 'feels like', is calculated by taking the relative humidity value for a specific location and factoring it into the air temperature reading. Additional factors like differences in body mass, height, and shape, metabolic differences, clothing, 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 especially crucial for babies and toddlers. Young children are generally more endangered than adults, as they usually less sweat. And also, due to larger skin surface relative to their small bodies and higher heat production as a result of their activity.
The human body normally cools itself by perspiration. Excessive warmth is eliminated from the body by evaporation of sweat. 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. If the body can not disperse the excessive heat and body temperature reaches conditions of hyperthermia, above 37.5°C (99.5°F) to 38.3°C (100.9°F), thermal conditions are potentially life-threatening.

Humidity

The average relative humidity in Port Moresby is 75%.

Rainfall

In Port Moresby, in December, it is raining for 22.3 days, with typically 106mm (4.17") of accumulated precipitation. In Port Moresby, during the entire year, the rain falls for 249.8 days and collects up to 1311mm (51.61") of precipitation.

Sea temperature

In December, the average sea temperature 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

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

Sunshine

The average sunshine in December is 10.9h.

UV index

January, March through May, October through December, with an average maximum UV index of 7, are months with the highest UV index in Port Moresby. A UV Index value of 6 to 7 symbolizes a high health risk from unsafe exposure to the UV radiation for the average person.
Note: The daily maximum UV index of 7 in December interpret into the following advice:
Take precautions and utilize sun safety practices. Protection against the skin and eye damage is required. 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. Sun-protective clothing, a long-sleeved shirt and pants, a wide-brimmed hat, and UVA and UVB-blocking sunglasses are particularly helpful in blocking UV radiation's harmful effects. Beware! The strength of the UV rays is significantly increased by the reflection of the water and sand.
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FAQ

What is the warmest month in Port Moresby?

December is the warmest month in Port Moresby, with an average high-temperature of 30.2°C (86.4°F) and an average low-temperature of 24.5°C (76.1°F).

What is the temperature in December in Port Moresby?

In Port Moresby, in December, the average high-temperature is 30.2°C (86.4°F), and the average low-temperature is 24.5°C (76.1°F). The average heat index (a.k.a. 'real feel', 'felt air temperature'), which represents the influence of relative humidity on air temperature, in December is evaluated at 36.9°C (98.4°F).

What is the average humidity in December in Port Moresby?

The average relative humidity in December in Port Moresby, Papua New Guinea, is 75%.

How much does it rain in Port Moresby in December?

In Port Moresby, Papua New Guinea, in December, it is raining for 22.3 days, with typically 106mm (4.17") of accumulated precipitation.

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). For swimming, diving, and other water activities, temperatures between 25°C (77°F) and 29°C (84.2°F) are perceived as very enjoyable and pleasurable for prolonged periods without feeling uncomfortable.

When are the longest days in Port Moresby?

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

How many hours of daylight does Port Moresby have in December?

The average length of the day in December in Port Moresby is 12.7h.

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

The average sunshine in December in Port Moresby is 10.9h.

What is the month with the highest UV index in Port Moresby?

Months with the highest UV index are January, March through May, October through December, with an average maximum UV index of 7.

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

In December, the average daily maximum UV index in Port Moresby is 7. A UV Index estimate of 6 to 7 represents a high health vulnerability from unsafe exposure to the Sun's UV rays.

Average temperature in December
Port Moresby, Papua New Guinea

Average temperature in December - Port Moresby, Papua New Guinea
  • Average high temperature in December: 30.2°C

The warmest month (with the highest average high temperature) is December (30.2°C).
Months with the lowest average high temperature are July and August (27.6°C).

  • Average low temperature in December: 24.5°C

The month with the highest average low temperature is December (24.5°C).
The coldest month (with the lowest average low temperature) is August (22.5°C).

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Average pressure in December
Port Moresby, Papua New Guinea

Average pressure in December - Port Moresby, Papua New Guinea
  • Average pressure in December: 1008.1mbar

The month with the highest atmospheric pressure is August (1012.1mbar).
The month with the lowest atmospheric pressure is January (1007.9mbar).

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Average wind speed in December
Port Moresby, Papua New Guinea

Average wind speed in December - Port Moresby, Papua New Guinea
  • Average wind speed in December: 9.7km/h

The windiest month (with the highest average wind speed) is July (18.9km/h).
The calmest month (with the lowest average wind speed) is December (9.7km/h).

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Average humidity in December
Port Moresby, Papua New Guinea

Average humidity in December - Port Moresby, Papua New Guinea
  • Average humidity in December: 75%

Months with the highest relative humidity are May and June (80%).
Months with the lowest relative humidity are January and February (73%).

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Average rainfall in December
Port Moresby, Papua New Guinea

Average rainfall in December - Port Moresby, Papua New Guinea
  • Average rainfall in December: 106mm

The wettest month (with the highest rainfall) is March (203mm).
The driest month (with the least rainfall) is July (46mm).

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Average rainfall days in December
Port Moresby, Papua New Guinea

Average rainfall days in December - Port Moresby, Papua New Guinea
  • Average rainfall days in December: 22.3 days

The month with the highest number of rainy days is March (24.6 days).
The month with the least rainy days is July (14.7 days).

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Average sea temperature in December
Port Moresby, Papua New Guinea

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).

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Average daylight in December /
Average sunshine in December
Port Moresby, Papua New Guinea

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 the shortest days are June and July (Average daylight: 11.6h).

  • Average sunshine in December: 10.9h

The month with the most sunshine is November (Average sunshine: 11.3h).
The month with the least sunshine is May (Average sunshine: 7.1h).

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Average sunshine days in December
Port Moresby, Papua New Guinea

Average sunshine days in December - Port Moresby, Papua New Guinea
  • Average sunshine days in December: 7.4 days

The month with the most sunshine days is July (13.4 days).
Months with the least sunshine days are March and April (5.2 days).

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Average UV index in December
Port Moresby, Papua New Guinea

Average UV index in December - Port Moresby, Papua New Guinea
  • Average UV index in December: 7

Months with the highest UV index are January, March, April, May, October, November and December (UV index 7).
Months with the lowest UV index are February, June, July, August and September (UV index 6).

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Average cloud cover in December
Port Moresby, Papua New Guinea

Average cloud cover in December - Port Moresby, Papua New Guinea
  • Average cloud cover in December: 33

The month with the most cloud cover is March (Cloud cover 41).
The month with the least cloud cover is November (Cloud cover 28).

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Average visibility in December
Port Moresby, Papua New Guinea

Average visibility in December - Port Moresby, Papua New Guinea
  • Average visibility in December: 10km

Months with the highest visibility are January, February, March, April, May, June, July, August, September, October, November and December (10km).
Months with the lowest visibility are January, February, March, April, May, June, July, August, September, October, November and December (10km).

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