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
Iaçu experiences a transition to a still hot 31.6°C (88.9°F) in average high-temperatures with the arrival of December, not greatly differing from November's 31.3°C (88.3°F). Iaçu, in December, observes a steady average low-temperature of 20.7°C (69.3°F).Heat index
The average heat index in December is computed to be a blistering 40°C (104°F). Ensure extra safety measures, heat exhaustion and heat cramps are likely. Continuous activity might result in heatstroke.Evaluating the heat index requires understanding its values in the shade and with gentle winds. Heat index values may rise by up to 15 Fahrenheit (8 Celsius) degrees when exposed to direct sunlight.
Note: The heat index, also known as 'apparent temperature' or 'real feel', gauges the sensation of temperature factoring in the air's moisture content. Physical activity, clothing, and metabolic variations are additional factors that impact an individual's perception of temperature. Under direct sun rays, the felt temperature might be heightened, with the heat index increasing by 15 Fahrenheit (8 Celsius) degrees. Heat index values are particularly relevant to children. Young ones often disregard the necessity to rest and hydrate. Thirst usually indicates advanced dehydration - hence, it is key to stay hydrated, particularly during ongoing physical activities.
The physiological response of the human body to excess warmth is to perspire, thereby cooling itself through sweat evaporation. During high air temperature and humidity (high heat index), the process of perspiration is hindered, intensifying the sensation of heat. Overheating can ensue when the body accumulates more heat than it can release, and dehydration severity may vary.
Humidity
In Iaçu, the average relative humidity in December is 72%.Rainfall
December is the month with the most rainfall. Rain falls for 15.1 days and accumulates 80mm (3.15") of precipitation.Daylight
December has the longest days of the year, with an average of 12h and 54min of daylight.On the first day of December, sunrise is at 05:05 and sunset at 17:54. On the last day of the month, sunrise is at 05:18 and sunset at 18:10 -03.
Sunshine
The average sunshine in December in Iaçu is 7.9h.UV index
In Iaçu, the average daily maximum UV index in December is 6. A UV Index reading of 6 to 7 represents a high health vulnerability from exposure to the Sun's UV rays for ordinary individuals.Note: In December, the maximum UV index of 6 transforms into these recommendations:
Resist extreme sun exposure. Guarding against solar damage is essential. Remember that the sun's UV radiation is strongest between 10 a.m. and 4 p.m. Make an effort to avoid direct sun exposure during these hours. In bright sunlight, prioritize sunglasses that grant protection from UVA and UVB radiation.
Published by: Weather Atlas | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
How hot is December?
What is the average humidity in December?
What is the rainiest month?
How much does it rain in December?
When are the longest days?
What is the average length of the day in December?
When are sunrise and sunset in December?
How long on average sun shines in December?
What is the UV index reading in December?
Average temperature in December
Iaçu, Brazil
- Average high temperature in December: 31.6°C
The warmest month (with the highest average high temperature) is March (32.4°C).
The month with the lowest average high temperature is July (27.3°C).
- Average low temperature in December: 20.7°C
The month with the highest average low temperature is November (21.2°C).
The coldest months (with the lowest average low temperature) are July and August (17.8°C).
Average pressure in December
Iaçu, Brazil
- Average pressure in December: 1012.9mbar
The month with the highest atmospheric pressure is July (1019.1mbar).
The month with the lowest atmospheric pressure is December (1012.9mbar).
Average wind speed in December
Iaçu, Brazil
- Average wind speed in December: 11.4km/h
The windiest month (with the highest average wind speed) is October (14.5km/h).
The calmest month (with the lowest average wind speed) is April (9.6km/h).
Average humidity in December
Iaçu, Brazil
- Average humidity in December: 72%
The month with the highest relative humidity is May (78%).
The month with the lowest relative humidity is October (68%).
Average rainfall in December
Iaçu, Brazil
- Average rainfall in December: 80mm
The wettest month (with the highest rainfall) is December (80mm).
The driest month (with the least rainfall) is September (10mm).
Average rainfall days in December
Iaçu, Brazil
- Average rainfall days in December: 15.1 days
The month with the highest number of rainy days is April (18.6 days).
The month with the least rainy days is August (12.8 days).
Average daylight in December /
Average sunshine in December
Iaçu, Brazil
- Average daylight in December: 12h and 5min
The month with the longest days is December (Average daylight: 12h and 54min).
The month with the shortest days is June (Average daylight: 11h and 24min).
- Average sunshine in December: 7h and 5min
The month with the most sunshine is February (Average sunshine: 8h and 48min).
The month with the least sunshine is July (Average sunshine: 4h and 30min).
Average sunshine days in December
Iaçu, Brazil
- Average sunshine days in December: 12.8 days
The month with the most sunshine days is August (13.1 days).
The months with the least sunshine days are April and November (9 days).
Average UV index in December
Iaçu, Brazil
- Average UV index in December: 6
The months with the highest UV index are January, February and October (UV index 7).
The month with the lowest UV index is June (UV index 5).
Average cloud cover in December
Iaçu, Brazil
- Average cloud cover in December: 48
The month with the most cloud cover is May (Cloud cover 58).
The month with the least cloud cover is September (Cloud cover 45).
Average visibility in December
Iaçu, Brazil
- Average visibility in December: 9km
The months with the highest visibility are September, October and November (10km).
The months with the lowest visibility are January, April, May, June and July (8km).
