January weather forecastJember, Indonesia

Weather in January

In Jember, Indonesia, January typically begins the year with an elevated level of humidity, setting the atmospheric tone for the month. Rainfall averages at 252mm (9.92"), making it the third-highest in terms of precipitation. During this time, the skies tend to be cloudier and the visibility slightly reduced. This pattern results in extended periods of overcast conditions, making it an ideal time for indoor activities. As January proceeds, a slight increase in daylight duration is observed, ushering in longer sunny periods.

Temperature

January's advent notes a subtle adjustment in average high-temperature to a moderately hot 29.9°C (85.8°F) from December. During January, the average low-temperature in Jember is a still warm 23.2°C (73.8°F).

Heat index

In January, the heat index is estimated at a very hot 38°C (100.4°F). Special measures are necessary to avoid heat cramps and heat exhaustion. Persistent activity could result in heatstroke.
It is essential to grasp that the heat index's numbers are for shade and light wind settings. In the presence of direct sunshine, the heat index could be augmented by 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'felt air temperature' or 'apparent temperature', reflects the blend of air temperature and relative humidity to give a temperature impression. This effect is personal, influenced by the individual's physical activity and heat sensitivity, shaped by factors including wind, attire, and metabolic variations. Direct sun rays can make one feel hotter, potentially raising the heat index by 15 Fahrenheit (8 Celsius) degrees. Heat index values are primarily vital for children. Children regularly disregard the necessity to rest and replenish fluids. Thirst is a late symptom of dehydration - thus, maintaining hydration, particularly during long-lasting physical activities, is essential.
Normally, the human body cools itself through perspiration, which removes excessive heat by evaporating sweat. When there is an excess of moisture in the atmosphere, the efficiency of the evaporation process is lessened, leading to less efficient body cooling and a sensation of overheating. Potential thermal conditions emerge as the body's heat gain outpaces its cooling mechanisms.

Humidity

The average relative humidity in January is 83%.

Rainfall

In Jember, during January, the rain falls for 30.5 days and regularly aggregates up to 252mm (9.92") of precipitation. In Jember, during the entire year, the rain falls for 247.8 days and collects up to 1536mm (60.47") of precipitation.

Daylight

In Jember, the average length of the day in January is 12h and 32min.
On the first day of the month, sunrise is at 05:10 and sunset at 17:46. On the last day of January, sunrise is at 05:24 and sunset at 17:52 WIB.

Sunshine

The month with the least sunshine is January, with an average of 6.9h of sunshine.

UV index

January and March, with an average maximum UV index of 6, are months with the lowest UV index in Jember. A UV Index reading of 6 to 7 represents a high health risk from exposure to the Sun's UV rays for ordinary individuals.
Note: In January, the average maximum UV index of 6 translates into the following recommendations:
Implement precautions and maintain sun safety methods. Avoidance of sunburn is demanded. Avoid direct Sun exposure and stay in the shade between 10 a.m. and 4 p.m., a time when UV radiation is most intense, noting that not all shade structures offer full protection. Limit sun-induced ocular harm with sunglasses that feature UVA and UVB filtration.