December weather forecastSantarém, Brazil
December
Weather in December
December, the first month of the summer in Santarém, is still a tropical month, with temperature in the range of an average high of 32°C (89.6°F) and an average low of 24.8°C (76.6°F).Temperature
The beginning of December records an average high-temperature of a still tropical 32°C (89.6°F), almost echoing the conditions of the previous month. The nighttime temperature in Santarém dips to a warm 24.8°C (76.6°F) on average during December.Heat index
December's heat index is evaluated at a blisteringly hot 41°C (105.8°F). Ensure extra safety steps, heat exhaustion and heat cramps are likely. Long activity might lead to heatstroke.Be advised, the heat index considers values for conditions in shade and with a light breeze. Direct sunlight has the potential to heighten heat index values by 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'feels like' or 'apparent temperature', reflects the feeling of heat when considering both air temperature and humidity. The individual's experience of temperature can be shaped by numerous aspects such as metabolic variations, physical exertion, and attire. In the direct sunlight, the weather's impact can be amplified, possibly boosting the heat index by up to 15 Fahrenheit (8 Celsius) degrees. Heat index values are extremely significant for children. Children often overlook the necessity for resting and fluid replenishment. Thirst is a late sign of dehydration - thus, it is critical to stay hydrated, especially during extended periods of physical activities.
Evaporating sweat, an outcome of perspiration, is key in assisting the human body to moderate its temperature. In conditions of both high temperature and humidity (a high heat index), sweating is limited and the perception of heat is enhanced. When body temperature rises due to an imbalance in heat gain, there's a potential for dehydration and overheating.
Humidity
In December, the average relative humidity is 72%.Rainfall
In Santarém, in December, during 23.5 rainfall days, 187mm (7.36") of precipitation is typically accumulated. Throughout the year, in Santarém, there are 259.2 rainfall days, and 2234mm (87.95") of precipitation is accumulated.Daylight
December has the longest days of the year in Santarém, with an average of 12h and 18min of daylight.On the first day of the month, sunrise is at 06:20 and sunset at 18:35. On the last day of December, in Santarém, sunrise is at 06:34 and sunset at 18:49 -03.
Sunshine
In Santarém, Brazil, the average sunshine in December is 8.2h.UV index
The months with the highest UV index in Santarém are January, April through December, with an average maximum UV index of 7. A UV Index value of 6 to 7 symbolizes a high health vulnerability from unprotected exposure to Sun's UV rays for ordinary individuals.Note: The maximum UV index of 7 during December leads to these instructions:
Take precautions against overexposure. Protection against sun damage is needed. Stay in the shade and limit sun exposure from 10 a.m. to 4 p.m., when UV radiation is most potent. Keep in mind that shade structures like parasols or canopies do not offer full protection. By wearing a generously brimmed hat, you can cut UV radiation exposure significantly.
Published by: Weather Atlas | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in December
Santarém, Brazil
- Average high temperature in December: 32°C
The warmest month (with the highest average high temperature) is October (34.5°C).
The month with the lowest average high temperature is April (29.3°C).
- Average low temperature in December: 24.8°C
The months with the highest average low temperature are October and November (25.8°C).
The coldest month (with the lowest average low temperature) is July (23.6°C).
Average pressure in December
Santarém, Brazil
- Average pressure in December: 1009.3mbar
The months with the highest atmospheric pressure are June and July (1012.5mbar).
The month with the lowest atmospheric pressure is November (1008.3mbar).
Average wind speed in December
Santarém, Brazil
- Average wind speed in December: 8.4km/h
The windiest months (with the highest average wind speed) are September and December (8.4km/h).
The calmest months (with the lowest average wind speed) are April and May (6.9km/h).
Average humidity in December
Santarém, Brazil
- Average humidity in December: 72%
The month with the highest relative humidity is April (86%).
The month with the lowest relative humidity is September (63%).
Average rainfall in December
Santarém, Brazil
- Average rainfall in December: 187mm
The wettest month (with the highest rainfall) is April (372mm).
The driest month (with the least rainfall) is August (32mm).
Average rainfall days in December
Santarém, Brazil
- Average rainfall days in December: 23.5 days
The month with the highest number of rainy days is May (29.2 days).
The month with the least rainy days is August (10.8 days).
Average daylight in December /
Average sunshine in December
Santarém, Brazil
- Average daylight in December: 12h and 18min
The month with the longest days is December (Average daylight: 12h and 18min).
The month with the shortest days is June (Average daylight: 12h and 0min).
- Average sunshine in December: 8h and 12min
The month with the most sunshine is September (Average sunshine: 9h and 48min).
The month with the least sunshine is February (Average sunshine: 6h and 42min).
Average sunshine days in December
Santarém, Brazil
- Average sunshine days in December: 6.5 days
The month with the most sunshine days is August (17.5 days).
The month with the least sunshine days is April (1.1 days).
Average UV index in December
Santarém, Brazil
- Average UV index in December: 7
The months with the highest UV index are January, April, May, June, July, August, September, October, November and December (UV index 7).
The months with the lowest UV index are February and March (UV index 6).
Average cloud cover in December
Santarém, Brazil
- Average cloud cover in December: 42
The month with the most cloud cover is February (Cloud cover 53).
The months with the least cloud cover are August and September (Cloud cover 21).
Average visibility in December
Santarém, Brazil
- Average visibility in December: 9km
The months with the highest visibility are July, August, September, October and November (10km).
The months with the lowest visibility are March, April and May (8km).
