December weather forecastMosman, Australia
December
Weather in December
The first month of the summer, December, is still a warm month in Mosman, Australia, with an average temperature varying between 24.8°C (76.6°F) and 18.5°C (65.3°F).Temperature
The beginning of December records an average high-temperature of a still warm 24.8°C (76.6°F), almost echoing the conditions of the previous month. Throughout December nights, Mosman registers an average low-temperature of 18.5°C (65.3°F).Humidity
The average relative humidity in December is 73%.Rainfall
In Mosman, during December, the rain falls for 13 days and regularly aggregates up to 42mm (1.65") of precipitation. Throughout the year, there are 152.6 rainfall days, and 635mm (25") of precipitation is accumulated.Sea temperature
In Mosman, the average seawater temperature in December is 21.9°C (71.4°F).Note: Swimming is not a pleasurable activity for most people when the water temperature is 21.9°C (71.4°F). Breathing control gets harder as the water temperature drops from 21°C (69.8°F) to 15°C (59°F).
Daylight
December has the longest days of the year in Mosman, with an average of 14h and 24min of daylight.On the first day of December in Mosman, Australia, sunrise is at 5:37 am and sunset at 7:51 pm. On the last day of the month, sunrise is at 5:47 am and sunset at 8:09 pm AEDT.
Sunshine
The average sunshine in December in Mosman is 9.9h.UV index
January, February and December, with an average maximum UV index of 6, are months with the highest UV index. A UV Index of 6 to 7 symbolizes a high threat to health from exposure to the Sun's UV rays for ordinary individuals.Note: In December, the average maximum UV index of 6 translates into the following recommendations:
Follow precautions and abide by sun safety rules. Deterrence of sunburn is imperative. The time between 10 a.m. and 4 p.m. is when UV radiation is at its peak. Limit exposure to direct sunlight during these hours. A hat with a generous brim can prevent nearly 50% of UV rays from reaching your eyes. Be alert! The reflection of water and sand augments UV radiation intensity.
Published by: Weather Atlas | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in December
Mosman, Australia
- Average high temperature in December: 24.8°C
The warmest month (with the highest average high temperature) is January (26.2°C).
The month with the lowest average high temperature is July (16.4°C).
- Average low temperature in December: 18.5°C
The month with the highest average low temperature is January (20.3°C).
The coldest months (with the lowest average low temperature) are July and August (10.9°C).
Average pressure in December
Mosman, Australia
- Average pressure in December: 1013.4mbar
The month with the highest atmospheric pressure is June (1020.8mbar).
The month with the lowest atmospheric pressure is January (1012.9mbar).
Average wind speed in December
Mosman, Australia
- Average wind speed in December: 16.5km/h
The windiest month (with the highest average wind speed) is August (16.8km/h).
The calmest month (with the lowest average wind speed) is April (14.6km/h).
Average humidity in December
Mosman, Australia
- Average humidity in December: 73%
The month with the highest relative humidity is February (76%).
The month with the lowest relative humidity is August (66%).
Average rainfall in December
Mosman, Australia
- Average rainfall in December: 42mm
The wettest month (with the highest rainfall) is February (95mm).
The driest month (with the least rainfall) is September (32mm).
Average rainfall days in December
Mosman, Australia
- Average rainfall days in December: 13 days
The month with the highest number of rainy days is March (17.5 days).
The month with the least rainy days is September (8.7 days).
Average sea temperature in December
Mosman, Australia
- Average sea temperature in December: 21.9°C
The best month for swimming (with the highest average sea temperature) is February (23.7°C).
The coldest month (with the lowest average sea temperature) is September (18.6°C).
Average daylight in December /
Average sunshine in December
Mosman, Australia
- Average daylight in December: 14h and 24min
The month with the longest days is December (Average daylight: 14h and 24min).
The month with the shortest days is June (Average daylight: 9h and 54min).
- Average sunshine in December: 9h and 54min
The month with the most sunshine is November (Average sunshine: 10h and 0min).
The month with the least sunshine is June (Average sunshine: 6h and 0min).
Average sunshine days in December
Mosman, Australia
- Average sunshine days in December: 14.4 days
The month with the most sunshine days is August (20.4 days).
The month with the least sunshine days is February (10.8 days).
Average UV index in December
Mosman, Australia
- Average UV index in December: 6
The months with the highest UV index are January, February and December (UV index 6).
The months with the lowest UV index are June, July, August and September (UV index 4).
Average cloud cover in December
Mosman, Australia
- Average cloud cover in December: 36
The month with the most cloud cover is February (Cloud cover 41).
The month with the least cloud cover is August (Cloud cover 24).
Average visibility in December
Mosman, Australia
- Average visibility in December: 10km
The months with the highest visibility are January, February, March, April, May, June, July, August, September, October, November and December (10km).
The months with the lowest visibility are January, February, March, April, May, June, July, August, September, October, November and December (10km).
