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
The arrival of December is marked by an average high-temperature of a still warm 26.8°C (80.2°F), bearing a close resemblance to November. Hornsby observes an average nighttime temperature of 17.7°C (63.9°F) during December.Humidity
The average relative humidity in December in Hornsby, Australia, is 70%.Rainfall
In Hornsby, in December, it is raining for 14.8 days, with typically 42mm (1.65") of accumulated precipitation. In Hornsby, during the entire year, the rain falls for 151.2 days and collects up to 570mm (22.44") of precipitation.Daylight
With an average of 14h and 18min of daylight, December has the longest days of the year in Hornsby, Australia.On the first day of December, 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
In Hornsby, the average sunshine in December is 9.6h.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 ordinary individuals.Note: In December, the maximum UV index of 6 translates into these guidelines:
Implement preventive steps and embrace sun safety standards. Protection from skin and eye distress is compulsory. Stay in the shade and avoid direct Sun exposure from 10 a.m. to 4 p.m., a period when UV radiation is particularly strong, noting that parasols or canopies may not offer total sun protection. Wearing sunglasses with both UVA and UVB protection effectively reduces sun-induced eye damage.
Published by: Weather Atlas | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
What is the temperature in December in Hornsby?
What is the average humidity in December in Hornsby?
How much does it rain in Hornsby in December?
When are the longest days in Hornsby?
How many hours of daylight does Hornsby have in December?
What time are sunrise and sunset in December in Hornsby?
How long on average sun shines in December in Hornsby?
When is the highest UV index in Hornsby?
What is the UV index reading in December in Hornsby?
Average temperature in December
Hornsby, Australia
- Average high temperature in December: 26.8°C
The warmest month (with the highest average high temperature) is January (28.2°C).
The month with the lowest average high temperature is July (16.7°C).
- Average low temperature in December: 17.7°C
The month with the highest average low temperature is January (19.3°C).
The coldest month (with the lowest average low temperature) is July (8.9°C).
Average pressure in December
Hornsby, 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
Hornsby, Australia
- Average wind speed in December: 12.1km/h
The windiest months (with the highest average wind speed) are January, August, September and December (12.1km/h).
The calmest month (with the lowest average wind speed) is April (10.6km/h).
Average humidity in December
Hornsby, Australia
- Average humidity in December: 70%
The month with the highest relative humidity is June (75%).
The months with the lowest relative humidity are August and September (66%).
Average rainfall in December
Hornsby, Australia
- Average rainfall in December: 42mm
The wettest month (with the highest rainfall) is February (89mm).
The driest months (with the least rainfall) are July and September (30mm).
Average rainfall days in December
Hornsby, Australia
- Average rainfall days in December: 14.8 days
The month with the highest number of rainy days is January (16.3 days).
The month with the least rainy days is May (8.5 days).
Average daylight in December /
Average sunshine in December
Hornsby, Australia
- Average daylight in December: 14h and 2min
The month with the longest days is December (Average daylight: 14h and 18min).
The month with the shortest days is June (Average daylight: 10h and 0min).
- Average sunshine in December: 9h and 4min
The month with the most sunshine is November (Average sunshine: 9h and 42min).
The month with the least sunshine is June (Average sunshine: 5h and 54min).
Average sunshine days in December
Hornsby, Australia
- Average sunshine days in December: 13.4 days
The month with the most sunshine days is August (19.8 days).
The month with the least sunshine days is February (10.6 days).
Average UV index in December
Hornsby, 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
Hornsby, Australia
- Average cloud cover in December: 38
The month with the most cloud cover is February (Cloud cover 43).
The month with the least cloud cover is August (Cloud cover 24).
Average visibility in December
Hornsby, Australia
- Average visibility in December: 9km
The months with the highest visibility are February, March, April, May, June, July, August, September and October (10km).
The months with the lowest visibility are January, November and December (9km).
