December weather forecast
Bukit Mertajam, Malaysia

In December, Bukit Mertajam is characterized by a decrease in rainfall from November's hefty 169mm (6.65") to December's 122mm (4.8"). The city commemorates the end of the monsoon season as rainfall decreases, paving the way for cheerier days. The weather takes a cool turn, particularly during nights while maintaining its overall warm and humid disposition during daytime. Sunshine is slightly scarce making the days seem shorter. The sea temperatures take a slight dip making sea swimming a cooler experience as the year ends.

Temperature

In Bukit Mertajam, the lowest temperatures are generally noted in December, averaging a high of 30.6°C (87.1°F) and a low of 23.4°C (74.1°F).

Heat index

For most parts of December, the heat index is estimated at a blistering 41°C (105.8°F). More protective measures are required - heat exhaustion and heat cramps are likely. Heatstroke may follow lengthy activity.
Heat index's context suggests values are appropriate for shady areas and slight breezes. 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', is a metric representing the sensation of warmth when air temperature and moisture come together. The impact of weather on an individual can be subjective, affected by the person's activity and heat perception, which can vary due to elements including wind, clothing, and metabolic differences. By being directly under the sun, it's possible for the felt temperature to increase by 15 Fahrenheit (8 Celsius) degrees. Heat index values are particularly meaningful for babies and toddlers. Children often miss understanding the importance of rest and rehydration. Thirst usually appears late during dehydration - therefore, maintaining hydration, particularly during long physical activities, is essential.
In the face of high temperatures, the human body's reflex is to perspire, leveraging sweat evaporation for cooling. With an abundance of moisture present in the air, the process of evaporation becomes less effective, and the body fails to cool down as it should, leading to the sensation of overheating. The body is at risk of dehydration and related complications when it fails to shed excessive heat.

Humidity

The months with the highest humidity in Bukit Mertajam, Malaysia, are November and December, with an average relative humidity of 83%.

Rainfall

In Bukit Mertajam, during December, the rain falls for 27.4 days and regularly aggregates up to 122mm (4.8") of precipitation. In Bukit Mertajam, during the entire year, the rain falls for 294.8 days and collects up to 1325mm (52.17") of precipitation.

Sea temperature

In Bukit Mertajam, in December, the average water temperature is 29°C (84.2°F).
Note: Water temperatures between 25°C (77°F) and 29°C (84.2°F) are regarded as very warm, ensuring all water activities are pleasurable for extended periods without feeling uneasy.

Daylight

With an average of 11h and 48min of daylight, December has the shortest days of the year in Bukit Mertajam.
On the first day of the month, sunrise is at 7:12 am and sunset at 7:02 pm. On the last day of December, sunrise is at 7:26 am and sunset at 7:15 pm +08.

Sunshine

In Bukit Mertajam, the average sunshine in December is 7.9h.

UV index

November and December, with an average maximum UV index of 6, are months with the lowest UV index in Bukit Mertajam. A UV Index reading of 6 to 7 represents a high health vulnerability from exposure to the Sun's UV rays for the average person.
Note: The UV index of 6 during December translates into the following guidance:
Inhibit overexposure. Warding off sun damage is of utmost importance. Remember that the sun's UV radiation is strongest between 10 a.m. and 4 p.m. Make an effort to avoid direct sun exposure during these hours. Limit sun-induced ocular harm with sunglasses that feature UVA and UVB filtration. Be cautious! Sand and water surfaces make the Sun's UV rays more potent.