Cairns
Australia
Long-term weather forecast
Long-term weather forecast

December weather forecast and climate
Cairns, Australia

The first month of the summer, December, is also a moderately hot month in Cairns, Australia, with average temperature fluctuating between 23.5°C (74.3°F) and 29.2°C (84.6°F).

Temperature

In Cairns, the average high-temperature in December is relatively the same as in November - a still moderately hot 29.2°C (84.6°F). In Cairns, the average low-temperature is 23.5°C (74.3°F).

Heat index

The average heat index is estimated at a hot 34.4°C (93.9°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. Exposure to direct sunshine can increase heat index values by up to 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'feels like', 'apparent temperature', 'felt air temperature', or 'real feel', is what the temperature feels like to the human body when the air temperature is combined with the relative humidity. This effect is individual, with diverse people perceiving weather differently for numerous reasons (pregnancy, clothing, wind), and activity. 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. 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.

Humidity

In December, the average relative humidity is 76%.

Rainfall

In Cairns, during 15.2 rainfall days, 79mm (3.11") of precipitation is typically accumulated. In Cairns, during the entire year, the rain falls for 167.3 days and collects up to 652mm (25.67") of precipitation.

Sea temperature

In December, the average sea temperature is 29°C (84.2°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 13.1h of daylight, December has the longest days of the year in Cairns, Australia.

Sunshine

In Cairns, the average sunshine is 10.3h.

UV index

In Cairns, the average daily maximum UV index is 6. A UV Index of 6 to 7 symbolizes a high health vulnerability from unprotected exposure to the Sun's UV rays for the ordinary person.
Note: In December, the average maximum UV index of 6 translate into the following recommendations:
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. 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. Caution! The reflection of sand and water significantly increases the intensity of the Sun's UV radiation.

What is the temperature in December in Cairns?

In December, in Cairns, Australia, the average high-temperature is 29.2°C (84.6°F), and the average low-temperature is 23.5°C (74.3°F). In December, the average heat index (a.k.a. 'apparent temperature', 'feels like'), that combines both air temperature and relative humidity, is estimated at 34.4°C (93.9°F).

What is the average humidity in December in Cairns?

In Cairns, the average relative humidity in December is 76%.

How many days does it rain in December in Cairns?

In Cairns, in December, it is raining for 15.2 days, with typically 79mm (3.11") of accumulated precipitation.

What is the sea water temperature in December in Cairns?

In December, the average sea temperature in Cairns is 29°C (84.2°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 Cairns?

December has the longest days of the year, with an average of 13.1h of daylight.

How many hours of daylight does Cairns have in December?

In Cairns, the average length of the day in December is 13.1h.

How many hours of sunshine does Cairns have in December?

The average sunshine in December in Cairns is 10.3h.

How high is the UV index in December in Cairns?

In Cairns, Australia, the average daily maximum UV index in December is 6. A UV Index reading of 6 to 7 represents a high health risk from unprotected exposure to the UV radiation.
Average temperature in December - Cairns, Australia
  • Average high temperature in December: 29.2°C

The warmest month (with the highest average high temperature) is February (29.4°C).
The month with the lowest average high temperature is July (23.2°C).

  • Average low temperature in December: 23.5°C

Months with the highest average low temperature are January and February (24.3°C).
The coldest month (with the lowest average low temperature) is August (18°C).

Average humidity in December - Cairns, Australia
  • Average humidity in December: 76%

The month with the highest relative humidity is March (81%).
Months with the lowest relative humidity are September and October (74%).

Average rainfall in December - Cairns, Australia
  • Average rainfall in December: 79mm

The wettest month (with the highest rainfall) is January (162mm).
The driest month (with the lowest rainfall) is September (9mm).

Average rainfall days in December - Cairns, Australia
  • Average rainfall days in December: 15.2 days

The month with the highest number of rainy days is January (22.4 days).
The month with the lowest number of rainy days is September (7.2 days).

Average sea temperature in December - Cairns, Australia
  • Average sea temperature in December: 29°C

The best month for swimming (with the highest average sea temperature) is January (29.5°C).
The coldest month (with the lowest average sea temperature) is July (23.8°C).

Average daylight in December / Average sunshine in December - Cairns, Australia
  • Average daylight in December: 13.1h

The month with the longest days is December (Average daylight: 13.1h).
The month with shortest days is June (Average daylight: 11.1h).

  • Average sunshine in December: 10.3h

Months with most sunshine are October and November (Average sunshine: 10.8h).
The month with least sunshine is June (Average sunshine: 5.9h).

Average UV index in December - Cairns, Australia
  • Average UV index in December: 6

Months with the highest UV index are January, February and November (UV index 7).
The month with the lowest UV index is July (UV index 5).