December weather forecastNarellan, Australia
December
Weather in December
The first month of the summer, December, is also a moderately hot month in Narellan, Australia, with an average temperature fluctuating between 16.5°C (61.7°F) and 27.4°C (81.3°F).Temperature
Transitioning into December, Narellan experiences an average high-temperature of a still warm 27.4°C (81.3°F), marking a minor shift from the preceding month. During December, the nighttime temperature averages to a comfortable 16.5°C (61.7°F).Heat index
Throughout December, the heat index is calculated to be 29°C (84.2°F). A sense of exhaustion might occur with extended exposure and activity, potentially causing heat cramps.Heat index specifics point out values are for conditions of shade and a slight breeze. The heat index could see an increase by 15 Fahrenheit (8 Celsius) degrees under direct sunshine.
Note: The heat index, also known as 'feels like' or 'apparent temperature', is calculated by taking the relative humidity value for a specific location and factoring it into the air temperature reading. This impact is subjective, influenced by the person's physical activity and individual heat perception, affected by factors including wind, attire, and metabolic differences. It is essential to realize that direct sunlight can escalate the perceived temperature, increasing the heat index by 15 Fahrenheit (8 Celsius) degrees. Heat index values are especially crucial for babies and toddlers. 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
The average relative humidity in December in Narellan is 69%.Rainfall
In Narellan, in December, it is raining for 12.6 days, with typically 37mm (1.46") of accumulated precipitation. Throughout the year, there are 137.9 rainfall days, and 502mm (19.76") of precipitation is accumulated.Daylight
December has the longest days of the year in Narellan, with an average of 14h and 24min of daylight.On the first day of December, sunrise is at 5:38 am and sunset at 7:53 pm. On the last day of the month, sunrise is at 5:48 am and sunset at 8:11 pm AEDT.
Sunshine
In December, the average sunshine in Narellan is 9.7h.UV index
January, February and December, with an average maximum UV index of 6, are months with the highest UV index in Narellan. A UV Index of 6 to 7 symbolizes a high threat to health from unsafe exposure to UV radiation for the average person.Note: A daily high UV index of 6 in December leads to these guidelines:
Enforce precautions and stick to sun safety measures. Preservation from skin and eye damage is essential. UV radiation from the Sun is most intense between 10 a.m. and 4 p.m. Try to avoid direct sunlight during this period. Select sunglasses that boast both UVA and UVB protection to limit the adverse effects of the sun on the eyes.
Published by: Weather Atlas | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in December
Narellan, Australia
- Average high temperature in December: 27.4°C
The warmest month (with the highest average high temperature) is January (28.7°C).
The months with the lowest average high temperature are June and July (16.3°C).
- Average low temperature in December: 16.5°C
The month with the highest average low temperature is January (18.3°C).
The coldest month (with the lowest average low temperature) is July (7.6°C).
Average pressure in December
Narellan, 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 (1012.8mbar).
Average wind speed in December
Narellan, Australia
- Average wind speed in December: 9.7km/h
The windiest months (with the highest average wind speed) are August and September (10.2km/h).
The calmest month (with the lowest average wind speed) is April (8.6km/h).
Average humidity in December
Narellan, Australia
- Average humidity in December: 69%
The month with the highest relative humidity is June (77%).
The months with the lowest relative humidity are August and September (67%).
Average rainfall in December
Narellan, Australia
- Average rainfall in December: 37mm
The wettest month (with the highest rainfall) is February (84mm).
The driest month (with the least rainfall) is May (24mm).
Average rainfall days in December
Narellan, Australia
- Average rainfall days in December: 12.6 days
The month with the highest number of rainy days is January (15.4 days).
The month with the least rainy days is August (7.8 days).
Average daylight in December /
Average sunshine in December
Narellan, 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 42min
The month with the most sunshine is November (Average sunshine: 9h and 48min).
The month with the least sunshine is June (Average sunshine: 6h and 0min).
Average sunshine days in December
Narellan, Australia
- Average sunshine days in December: 14.4 days
The month with the most sunshine days is August (21.7 days).
The month with the least sunshine days is February (10.6 days).
Average UV index in December
Narellan, 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 April, May, June, July, August and September (UV index 4).
Average cloud cover in December
Narellan, 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 23).
Average visibility in December
Narellan, Australia
- Average visibility in December: 9km
The months with the highest visibility are June and August (10km).
The months with the lowest visibility are January, February, March, April, May, July, September, October, November and December (9km).
