Contents
- Weather in December
- Frequently asked questions
- Average temperature in December
- Average pressure in December
- Average wind speed in December
- Average humidity in December
- Average rainfall in December
- Average rainfall days in December
- Average daylight in December
- Average sunshine in December
- Average sunshine days in December
- Average UV index in December
- Average cloud cover in December
- Average visibility in December
December
Weather in December
Temperature
With the start of December, Saint Marys measures an average high-temperature of a still warm 28.2°C (82.8°F), not significantly differing from November's 26.4°C (79.5°F). Throughout December nights, Saint Marys reports a steady thermal contrast from the day, with an average low-temperature of 15.8°C (60.4°F).Heat index
December's average heat index is appraised at a tropical 31°C (87.8°F). If one sustains activity during exposure, it could lead to a sense of fatigue, with a chance of heat cramps.It is essential to grasp that the heat index's numbers are for shade and light wind settings. With direct sunlight, the heat index could increase by 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'apparent temperature' or 'felt air temperature', comes about by integrating the temperature readings with the humidity levels. Factors such as metabolic variations, being pregnant, and physical activity can impact an individual's weather perception. Considering the impact of direct sunlight, it's possible for the heat index to surge by up to 15 Fahrenheit (8 Celsius) degrees. Heat index values are particularly relevant to babies and toddlers. Young children are more at risk than adults since they tend to sweat less. Moreover, their large skin surface in proportion to their small bodies and the high heat production due to their activities contribute to their vulnerability.
Humidity
In Saint Marys, the average relative humidity in December is 68%.Rainfall
In Saint Marys, in December, it is raining for 12.4 days, with typically 34mm (1.34") of accumulated precipitation. Throughout the year, there are 137.7 rainfall days, and 501mm (19.72") of precipitation is accumulated.Daylight
The month with the longest days is December, with an average of 14h and 24min of daylight.On the first day of the month, sunrise is at 5:39 am and sunset at 7:52 pm. On the last day of December, sunrise is at 5:49 am and sunset at 8:10 pm AEDT.
Sunshine
November and December, with an average of 9.8h of sunshine, are months with the most sunshine.UV index
The months with the highest UV index are January, February, November and December, with an average maximum UV index of 6. A UV Index reading of 6 to 7 represents a high threat to health from unsafe exposure to UV radiation for average individuals.Note: The daily high UV index of 6 during December translates into the following recommendations:
Avoid excessive sunlight. Those with lighter skin may experience burning in less than 20 minutes. From 10 a.m. to 4 p.m., when UV radiation is at its strongest, limit direct exposure to the Sun and note that shade structures may not provide full sun protection. Clothes that are both tight-knit and comfortably loose are prime choices for sun protection.
Published by: Weather Atlas | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
How hot is December in Saint Marys?
What is the average humidity in December?
How much does it rain in December?
When are the longest days?
What is the average length of the day in December?
When are sunrise and sunset in December?
What is the month with the most sunshine in Saint Marys?
How long on average sun shines in December?
When is the highest UV index?
How high is the UV index in December?
Average temperature in December
Saint Marys, Australia
- Average high temperature in December: 28.2°C
The warmest month (with the highest average high temperature) is January (29.6°C).
The month with the lowest average high temperature is June (16°C).
- Average low temperature in December: 15.8°C
The month with the highest average low temperature is January (17.4°C).
The coldest month (with the lowest average low temperature) is July (6.3°C).
Average pressure in December
Saint Marys, Australia
- Average pressure in December: 1013.3mbar
The month with the highest atmospheric pressure is June (1021.2mbar).
The month with the lowest atmospheric pressure is January (1012.8mbar).
Average wind speed in December
Saint Marys, Australia
- Average wind speed in December: 8km/h
The windiest month (with the highest average wind speed) is September (8.3km/h).
The calmest month (with the lowest average wind speed) is April (7km/h).
Average humidity in December
Saint Marys, Australia
- Average humidity in December: 68%
The month with the highest relative humidity is June (78%).
The month with the lowest relative humidity is September (66%).
Average rainfall in December
Saint Marys, Australia
- Average rainfall in December: 34mm
The wettest month (with the highest rainfall) is February (101mm).
The driest month (with the least rainfall) is May (22mm).
Average rainfall days in December
Saint Marys, Australia
- Average rainfall days in December: 12.4 days
The month with the highest number of rainy days is March (16.3 days).
The month with the least rainy days is August (6.7 days).
Average daylight in December /
Average sunshine in December
Saint Marys, Australia
- Average daylight in December: 14h and 2min
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 5min
The months with the most sunshine are November and December (Average sunshine: 9h and 48min).
The month with the least sunshine is June (Average sunshine: 6h and 0min).
Average sunshine days in December
Saint Marys, Australia
- Average sunshine days in December: 14.4 days
The month with the most sunshine days is August (22.7 days).
The month with the least sunshine days is February (10 days).
Average UV index in December
Saint Marys, Australia
- Average UV index in December: 6
The months with the highest UV index are January, February, November and December (UV index 6).
The months with the lowest UV index are April, May, June, July, August and September (UV index 4).
Average cloud cover in December
Saint Marys, Australia
- Average cloud cover in December: 38
The months with the most cloud cover are February and March (Cloud cover 45).
The month with the least cloud cover is August (Cloud cover 25).
Average visibility in December
Saint Marys, Australia
- Average visibility in December: 9km
The months with the highest visibility are January, February, March, April, May, June, July, August, September, October, November and December (9km).
The months with the lowest visibility are January, February, March, April, May, June, July, August, September, October, November and December (9km).
