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
Castle Hill's average high-temperature marks a still warm 27.7°C (81.9°F) with the advent of December, closely mirroring that of the preceding month. Throughout December, the temperature tends to fall to a consistent average low of 17.1°C (62.8°F).Heat index
December's average heat index is evaluated at a hot 30°C (86°F). Continuous activity in exposure could lead to a feeling of fatigue and heat cramps.It is essential to grasp that the heat index's numbers are for shade and light wind settings. When under direct sunshine, the heat index may be elevated by 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'apparent temperature' or 'felt air temperature', blends air temperature and moisture content to represent the felt temperature to humans. Physical activity, clothing, and metabolic variations are additional factors that impact an individual's perception of temperature. Direct sunlight can potentially raise the heat index by 15 Fahrenheit (8 Celsius) degrees, so it's crucial to consider. Heat index values hold great significance to children. Children often fail to recognize the requirement to rest and rehydrate. Thirst, being a late symptom of dehydration, underlines the importance of maintaining hydration, especially during ongoing physical activities.
Humidity
In Castle Hill, the average relative humidity in December is 68%.Rainfall
In Castle Hill, during December, the rain falls for 14 days and regularly aggregates up to 36mm (1.42") of precipitation. In Castle Hill, during the entire year, the rain falls for 149.1 days and collects up to 546mm (21.5") of precipitation.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 5:38 am and sunset at 7:51 pm. On the last day of December, sunrise is at 5:48 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 in Castle Hill.UV index
January, February, November and December, with an average maximum UV index of 6, are months with the highest UV index in Castle Hill. A UV Index of 6 to 7 symbolizes a high threat to health from exposure to the Sun's UV rays for average individuals.Note: In December, the maximum UV index of 6 translates into these guidelines:
Dodge overexposure. Fair-skinned people can get singed in less than 20 minutes. Limit direct sun exposure especially between 10 a.m. and 4 p.m., when UV radiation is at its peak. However, keep in mind that shade structures may not provide full sun protection. Prioritize a wide-brim hat for comprehensive sun defense for your face, neck, eyes, and ears.
Published by: Weather Atlas | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
What are the temperatures in Castle Hill in December?
What is the average humidity in December in Castle Hill?
How much does it rain in Castle Hill in December?
When are the longest days in Castle Hill?
What is the average length of the day in December in Castle Hill?
What time are sunrise and sunset in December in Castle Hill?
What are the months with the most sunshine in Castle Hill?
How long on average sun shines in December in Castle Hill?
When is the highest UV index in Castle Hill?
How high is the UV index in December in Castle Hill?
Average temperature in December
Castle Hill, 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
Castle Hill, 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
Castle Hill, 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
Castle Hill, 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
Castle Hill, 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
Castle Hill, 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
Castle Hill, 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: 10h and 0min).
- Average sunshine in December: 9h and 2min
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
Castle Hill, 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
Castle Hill, 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
Castle Hill, 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
Castle Hill, 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).
