December weather forecastThornleigh, Australia
December
Weather in December
December, the first month of the summer in Thornleigh, is still a warm month, with temperature in the range of an average low of 17.1°C (62.8°F) and an average high of 27.7°C (81.9°F).Temperature
The advent of December brings an average high-temperature of a still warm 27.7°C (81.9°F), almost identical to the preceding month. An average low-temperature of 17.1°C (62.8°F) is recorded during the nights in December in Thornleigh.Heat index
During December, the heat index is calculated to be a hot 30°C (86°F). Constant exposure and activity lead to possible fatigue. Prolonged exercise may result in heat cramps.Consider that heat index readings are for situations in the shade and light wind. An exposure to direct sunlight may lift the heat index values by 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'real feel' or 'apparent temperature', is a numerical representation of warmth when taking temperature and moisture levels into account. A person's impression of weather can be swayed by numerous aspects, among them metabolic variations, pregnancy, and activity levels. 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 important for children. In general, younger individuals are at greater risk than adults because they tend to sweat less. Also, having a larger skin surface to body size ratio and greater heat production due to their active behavior contribute to this danger.
Humidity
In Thornleigh, the average relative humidity in December is 68%.Rainfall
In Thornleigh, during December, the rain falls for 14 days and regularly aggregates up to 36mm (1.42") of precipitation. Throughout the year, there are 149.1 rainfall days, and 546mm (21.5") of precipitation is accumulated.Daylight
With an average of 14h and 24min of daylight, December has the longest days of the year in Thornleigh.On the first day of December in Thornleigh, 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
November and December, with an average of 9.4h of sunshine, are months with the most sunshine.UV index
January, February, November and December, with an average maximum UV index of 6, are months with the highest UV index in Thornleigh. A UV Index value of 6 to 7 symbolizes a high threat to health from exposure to the Sun's UV radiation for ordinary individuals.Note: In December, the UV index of 6 transforms into the following advice:
Guard against overexposure. Protection from sun-induced harm is essential. Limit direct sun exposure and seek shade between 10 a.m. and 4 p.m., the time of the most intense UV radiation, noting that shade structures may not provide total sun protection. Counter UV radiation's ill effects with clothing designed for sun safety and UV-resistant eyewear.
Published by: Weather Atlas | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in December
Thornleigh, Australia
- Average high temperature in December: 27.7°C
The warmest month (with the highest average high temperature) is January (29.2°C).
The month with the lowest average high temperature is June (16.8°C).
- Average low temperature in December: 17.1°C
The month with the highest average low temperature is January (18.8°C).
The coldest month (with the lowest average low temperature) is July (8.1°C).
Average pressure in December
Thornleigh, Australia
- Average pressure in December: 1013.3mbar
The month with the highest atmospheric pressure is June (1021mbar).
The month with the lowest atmospheric pressure is January (1012.9mbar).
Average wind speed in December
Thornleigh, Australia
- Average wind speed in December: 10.2km/h
The windiest month (with the highest average wind speed) is December (10.2km/h).
The calmest month (with the lowest average wind speed) is April (8.8km/h).
Average humidity in December
Thornleigh, Australia
- Average humidity in December: 68%
The month with the highest relative humidity is June (76%).
The month with the lowest relative humidity is September (65%).
Average rainfall in December
Thornleigh, Australia
- Average rainfall in December: 36mm
The wettest month (with the highest rainfall) is February (87mm).
The driest month (with the least rainfall) is May (27mm).
Average rainfall days in December
Thornleigh, Australia
- Average rainfall days in December: 14 days
The month with the highest number of rainy days is March (17.6 days).
The month with the least rainy days is August (7.9 days).
Average daylight in December /
Average sunshine in December
Thornleigh, 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: 10h and 0min).
- Average sunshine in December: 9h and 24min
The months with the most sunshine are November and December (Average sunshine: 9h and 24min).
The month with the least sunshine is June (Average sunshine: 5h and 48min).
Average sunshine days in December
Thornleigh, Australia
- Average sunshine days in December: 14.2 days
The month with the most sunshine days is August (21 days).
The month with the least sunshine days is February (10.4 days).
Average UV index in December
Thornleigh, 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 May, June, July, August and September (UV index 4).
Average cloud cover in December
Thornleigh, Australia
- Average cloud cover in December: 40
The month with the most cloud cover is February (Cloud cover 46).
The month with the least cloud cover is August (Cloud cover 25).
Average visibility in December
Thornleigh, 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).
