December weather forecast
Sidoarjo, Indonesia

December, the first month of the summer in Sidoarjo, is also a hot month, with an average temperature fluctuating between 31.1°C (88°F) and 26.3°C (79.3°F).

Temperature

As November transitions into December, Sidoarjo records an average high-temperature of a still tropical 31.1°C (88°F), showing a gentle shift from the preceding month. In Sidoarjo, the nocturnal temperatures throughout December show a marginal dip from the daytime averages, settling at a moderately hot 26.3°C (79.3°F).

Heat index

During December, the heat index is calculated to be a torrid 39°C (102.2°F). Additional precautions are required to avert heat cramps and heat exhaustion. Persistent activity may culminate in heatstroke.
The metrics for the heat index are tailored for both shady environments and light winds. The heat index may scale up by 15 Fahrenheit (8 Celsius) degrees with direct sun exposure.
Note: The heat index, also known as 'apparent temperature' or 'real feel', is derived by integrating air temperature with the existing relative humidity to express the perceived warmth. The individual's experience of temperature can be shaped by numerous aspects such as metabolic variations, physical exertion, and attire. When exposed to direct sunlight, it's possible for the heat index to increase by as much as 15 Fahrenheit (8 Celsius) degrees. Heat index values are quite important for babies and toddlers. Children often fail to understand the importance of rest and rehydration. Thirst is a late manifestation of dehydration - hence, it is crucial to stay hydrated, especially during ongoing physical activities.
To cool down, the human body relies on perspiration, a process where excessive heat is eliminated as sweat evaporates. In the presence of elevated relative humidity, the evaporation rate decreases. This reduction leads to increased body heat retention compared to conditions of dry air. Heat disorders may be on the horizon when body temperatures rise from inadequate heat management.

Humidity

In Sidoarjo, the average relative humidity in December is 74%.

Rainfall

In Sidoarjo, Indonesia, in December, during 24.7 rainfall days, 103mm (4.06") of precipitation is typically accumulated. Throughout the year, there are 188.4 rainfall days, and 840mm (33.07") of precipitation is accumulated.

Daylight

With an average of 12h and 30min of daylight, December has the longest days of the year in Sidoarjo.
On the first day of December, sunrise is at 05:02 and sunset at 17:34. On the last day of the month, sunrise is at 05:15 and sunset at 17:48 WIB.

Sunshine

In December, the average sunshine is 8.6h.

UV index

The months with the highest UV index in Sidoarjo are January through December, with an average maximum UV index of 7. January through December, with an average maximum UV index of 7, are months with the lowest UV index. A UV Index of 6 to 7 symbolizes a high health hazard from exposure to the Sun's UV rays for average individuals.
Note: In December, a daily UV index of 7 turns into the following recommendations:
Sidestep overexposure. Individuals with fair complexions risk burning in fewer than 20 minutes. Limit your exposure to the sun's UV radiation, which is strongest between 10 a.m. and 4 p.m., and note that parasols or canopies may not provide full sun protection. Sunglasses that ward off UVA and UVB rays play a pivotal role in reducing solar eye damage.