December weather forecastRianápolis, Brazil
December
Weather in December
December, the first month of the summer in Rianápolis, is still a warm month, with an average temperature fluctuating between 19.3°C (66.7°F) and 27.2°C (81°F).Temperature
In December, Rianápolis's weather conditions record an average high-temperature of a still warm 27.2°C (81°F), demonstrating little divergence from the preceding month. Throughout December nights, Rianápolis registers an average low-temperature of 19.3°C (66.7°F).Heat index
For most parts of December, the heat index is appraised at a tropical 31°C (87.8°F). Continuing activity during long-lasting exposure might induce tiredness and result in heat cramps.The metrics for the heat index are tailored for both shady environments and light winds. Direct sunlight can cause a surge in the heat index by 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'felt air temperature' or 'real feel', is an amalgamation of air temperature and humidity to express the equivalent perceived temperature. The impact of temperature is individual, as people's perception of weather may change based on their body mass, height, and physical activity. Given the impact of direct sunlight, it's noteworthy that the felt temperature can rise by 15 Fahrenheit (8 Celsius) degrees. Heat index values are primarily vital for children. Young people are generally more susceptible than adults because they perspire less. Furthermore, their proportionally larger skin surface to their petite bodies and the increased heat output from their actions add to the risk.
Humidity
The average relative humidity in December in Rianápolis is 85%.Rainfall
In Rianápolis, Brazil, during December, the rain falls for 29.3 days and regularly aggregates up to 242mm (9.53") of precipitation. In Rianápolis, during the entire year, the rain falls for 219.6 days and collects up to 1537mm (60.51") of precipitation.Daylight
The month with the longest days in Rianápolis is December, with an average of 13h and 0min of daylight.On the first day of the month, sunrise is at 05:37 and sunset at 18:36. On the last day of December, in Rianápolis, sunrise is at 05:50 and sunset at 18:52 -03.
Sunshine
The month with the least sunshine is December, with an average of 6.9h of sunshine.UV index
February and December, with an average maximum UV index of 5, are months with the lowest UV index. A UV Index value of 3 to 5 symbolizes a medium vulnerability from unsafe exposure to UV radiation for ordinary individuals.Note: In December, the UV index of 5 transforms into the following advice:
Preventative actions are necessary - The mandate to avoid skin and eye damage is in place. Solar radiation peaks around mid-day, so it's wise to limit exposure to the Sun at this time. Equip yourself with UVA and UVB-filtering sunglasses on clear, sunny days.
Published by: Weather Atlas | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in December
Rianápolis, Brazil
- Average high temperature in December: 27.2°C
The warmest month (with the highest average high temperature) is September (33.5°C).
The month with the lowest average high temperature is January (27°C).
- Average low temperature in December: 19.3°C
The month with the highest average low temperature is October (21°C).
The coldest month (with the lowest average low temperature) is July (16.1°C).
Average pressure in December
Rianápolis, Brazil
- Average pressure in December: 1011.4mbar
The month with the highest atmospheric pressure is July (1017mbar).
The month with the lowest atmospheric pressure is November (1011mbar).
Average wind speed in December
Rianápolis, Brazil
- Average wind speed in December: 5.9km/h
The windiest month (with the highest average wind speed) is August (8.3km/h).
The calmest month (with the lowest average wind speed) is March (5.2km/h).
Average humidity in December
Rianápolis, Brazil
- Average humidity in December: 85%
The month with the highest relative humidity is March (88%).
The month with the lowest relative humidity is September (40%).
Average rainfall in December
Rianápolis, Brazil
- Average rainfall in December: 242mm
The wettest month (with the highest rainfall) is November (266mm).
The driest month (with the least rainfall) is July (1mm).
Average rainfall days in December
Rianápolis, Brazil
- Average rainfall days in December: 29.3 days
The months with the highest number of rainy days are January and December (29.3 days).
The month with the least rainy days is August (1.3 days).
Average daylight in December /
Average sunshine in December
Rianápolis, Brazil
- Average daylight in December: 13h and 0min
The month with the longest days is December (Average daylight: 13h and 0min).
The month with the shortest days is June (Average daylight: 11h and 12min).
- Average sunshine in December: 6h and 54min
The months with the most sunshine are July and August (Average sunshine: 9h and 54min).
The month with the least sunshine is December (Average sunshine: 6h and 54min).
Average sunshine days in December
Rianápolis, Brazil
- Average sunshine days in December: 1.5 days
The month with the most sunshine days is August (29 days).
The months with the least sunshine days are February and November (0.7 days).
Average UV index in December
Rianápolis, Brazil
- Average UV index in December: 5
The months with the highest UV index are August and September (UV index 7).
The months with the lowest UV index are February and December (UV index 5).
Average cloud cover in December
Rianápolis, Brazil
- Average cloud cover in December: 56
The month with the most cloud cover is December (Cloud cover 56).
The months with the least cloud cover are July and August (Cloud cover 11).
Average visibility in December
Rianápolis, Brazil
- Average visibility in December: 8km
The months with the highest visibility are June, July, August and September (10km).
The months with the lowest visibility are January, February and March (7km).
