December weather forecastSão Mateus, Brazil
December weather for São Mateus, Brazil: The first month of the summer, December, is still a warm month in São Mateus, Brazil, with an average temperature ranging between max 28.9°C (84°F) and min 22.8°C (73°F). The month with the longest days in São Mateus, Brazil, is December, with an average of 13h and 12min of daylight.
December
Weather in December
The first month of the summer, December, is still a warm month in São Mateus, Brazil, with an average temperature ranging between max 28.9°C (84°F) and min 22.8°C (73°F).Temperature
In December, São Mateus's weather conditions record an average high-temperature of a still moderately hot 28.9°C (84°F), demonstrating little divergence from the preceding month. Nightly temperatures in São Mateus drop to an average low of 22.8°C (73°F) in December.Heat index
The heat index value for December is appraised at a torrid 35°C (95°F). Take additional safety steps, risk of heat exhaustion and heat cramps is notable. Prolonged activity may cause heatstroke.Keep in mind the heat index values are meant for areas in shade and with light wind. Exposure to the sun directly might heighten the heat index by 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'feels like' or 'felt air temperature', gives an indication of how one might feel in terms of heat after considering humidity. The effect is personal, with varied weather perceptions among individuals due to differences in body mass, stature, and physical activity. It is essential to be conscious of the fact that direct sunlight can intensify the felt heat, leading to an elevation in the heat index by 15 Fahrenheit (8 Celsius) degrees. Heat index values are primarily vital for children. Kids are usually more vulnerable than adults, given their lesser sweating ability. Along with their larger skin surface relative to their small stature and the excess heat due to their activity, their risk is amplified.
The human body normally cools itself by perspiration, as evaporated sweat carries heat away from the body. An increase in relative humidity disrupts body cooling by slowing the evaporation rate, thereby reducing the rate at which the body cools and amplifying the sense of heat. Heat absorption that surpasses the body's shedding capability can lead to overheating and varying levels of dehydration.
Humidity
March, April, June, November and December, with an average relative humidity of 82%, are the most humid months.Rainfall
The month with the most rainfall is December, when the rain falls for 20 days and typically aggregates up to 143mm (5.63") of precipitation.Daylight
December has the longest days of the year in São Mateus, Brazil, with an average of 13h and 12min of daylight.On the first day of the month, sunrise is at 04:53 and sunset at 18:03. On the last day of December, in São Mateus, sunrise is at 05:05 and sunset at 18:19 -03.
Sunshine
The average sunshine in December in São Mateus is 8.5h.UV index
The months with the highest UV index are January through March and December, with an average maximum UV index of 7. A UV Index value of 6 to 7 symbolizes a high health risk from unsafe exposure to UV radiation for the average person.Note: In December, the maximum UV index of 7 suggests this advice:
Implement precautions and maintain sun safety methods. Avoidance of sunburn is demanded. The hours from 10 a.m. to 4 p.m. have the most intense UV radiation. As much as possible, limit direct sun exposure during this period. For holistic sun protection encompassing the eyes, ears, face, and neck, a wide-brim hat is key.
Published by: Weather Atlas | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in December
São Mateus, Brazil
- Average high temperature in December: 28.9°C
The warmest month (with the highest average high temperature) is February (30.1°C).
The month with the lowest average high temperature is July (25.7°C).
- Average low temperature in December: 22.8°C
The month with the highest average low temperature is February (23.2°C).
The coldest month (with the lowest average low temperature) is July (19.2°C).
Average pressure in December
São Mateus, Brazil
- Average pressure in December: 1012.8mbar
The month with the highest atmospheric pressure is July (1020.5mbar).
The month with the lowest atmospheric pressure is December (1012.8mbar).
Average wind speed in December
São Mateus, Brazil
- Average wind speed in December: 12.3km/h
The windiest month (with the highest average wind speed) is October (13.2km/h).
The calmest month (with the lowest average wind speed) is April (9.7km/h).
Average humidity in December
São Mateus, Brazil
- Average humidity in December: 82%
The months with the highest relative humidity are March, April, June, November and December (82%).
The month with the lowest relative humidity is September (76%).
Average rainfall in December
São Mateus, Brazil
- Average rainfall in December: 143mm
The wettest month (with the highest rainfall) is December (143mm).
The driest month (with the least rainfall) is September (17mm).
Average rainfall days in December
São Mateus, Brazil
- Average rainfall days in December: 20 days
The month with the highest number of rainy days is March (20.7 days).
The month with the least rainy days is September (11.1 days).
Average daylight in December /
Average sunshine in December
São Mateus, Brazil
- Average daylight in December: 13h and 12min
The month with the longest days is December (Average daylight: 13h and 12min).
The month with the shortest days is June (Average daylight: 11h and 0min).
- Average sunshine in December: 8h and 30min
The month with the most sunshine is February (Average sunshine: 9h and 0min).
The month with the least sunshine is October (Average sunshine: 7h and 0min).
Average sunshine days in December
São Mateus, Brazil
- Average sunshine days in December: 9.2 days
The month with the most sunshine days is May (15.9 days).
The month with the least sunshine days is March (7.8 days).
Average UV index in December
São Mateus, Brazil
- Average UV index in December: 7
The months with the highest UV index are January, February, March and December (UV index 7).
The months with the lowest UV index are April, May, June, July, August, September, October and November (UV index 6).
Average cloud cover in December
São Mateus, Brazil
- Average cloud cover in December: 44
The month with the most cloud cover is November (Cloud cover 52).
The month with the least cloud cover is February (Cloud cover 32).
Average visibility in December
São Mateus, Brazil
- Average visibility in December: 9km
The months with the highest visibility are February, August, September and October (10km).
The months with the lowest visibility are January, March, April, May, June, July, November and December (9km).
