December signifies the culmination of the year, bringing a return of early year weather patterns to
Goiânia. The city experiences a rise in rainfall to 268mm (10.55") which is spread over 19 days, marking it as the wettest month alongside
January. As the year closes, daylight stretches to 13.1 hours, yet with only 5.6 hours of sunshine. December also brings back the high humidity levels experienced at the start of the year. Moving forward to January, anticipate similar weather conditions with warmth, rain, and high humidity.
Temperature
December's arrival in Goiânia brings an average high-temperature of a still warm 28.9°C (84°F), slightly deviating from
November's 29.7°C (85.5°F). Goiânia's nighttime temperature in December falls to an average of 19.7°C (67.5°F).
Heat index
Throughout December, the heat index is computed to be a hot 34°C (93.2°F). Special measures are necessary to avoid heat cramps and heat exhaustion. Persistent activity could result in heatstroke.
Heat index evaluations are typically in the context of light winds and shaded environments. A direct sunlight exposure may boost the heat index by 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'real feel' or 'feels like', embodies the combination of air temperature and moisture content to illustrate perceived heat. Additional elements including metabolic differences, the level of physical activity, and attire have a role in shaping the individual's temperature perception. Consider the sun's direct rays and their impact; they can potentially increase the heat index by 15 Fahrenheit (8 Celsius) degrees. Heat index values are highly important for children. Young children typically face greater hazards than adults because they do not sweat as much. Their larger skin surface in comparison to their little bodies and the high heat production from their active nature compounds their vulnerability.
Humidity
February and December, with an average relative humidity of 76%, are the most humid months in Goiânia,
Brazil.
Rainfall
December is the month with the most rainfall. Rain falls for 19 days and accumulates 268mm (10.55") of precipitation.
Daylight
The month with the longest days is December, with an average of 13h and 6min of daylight.
On the first day of the month, sunrise is at 05:34 and sunset at 18:37. On the last day of December, in Goiânia, sunrise is at 05:47 and sunset at 18:53 -03.
Sunshine
The months with the least sunshine are February and December, with an average of 5.6h of sunshine.