January invites locals and visitors alike to enjoy its warm climate in
Nuku'alofa,
Tonga. The temperature often fluctuates between a high of 29.4°C (84.9°F) and a low of 23.4°C (74.1°F). The shift to
February bears minimal change in temperature but more distinct alterations could be felt in terms of precipitation. January stands out with the most sum of sunshine hours. Humidity and UV index also remain relatively high, necessitating ample hydration and sun protection.
Temperature
Nuku'alofa ushers in January with an average high-temperature of a still moderately hot 29.4°C (84.9°F), showing a close resemblance to the previous month. Throughout the month of January, Nuku'alofa witnesses an average temperature of 23.4°C (74.1°F).
Heat index
The heat index for January is calculated to be a fiery hot 35°C (95°F). Greater safety measures are needed, risk of heat exhaustion and heat cramps is high. Continuous activity might trigger heatstroke.
Evaluating the heat index requires understanding its values in the shade and with gentle winds. With direct sunlight, the heat index could increase by 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'real feel' or 'apparent temperature', binds temperature metrics with humidity values to give a sense of the actual warmth. Additional elements encompassing metabolic differences, the degree of physical activity, and attire can impact the individual's perception of temperature. Realize that direct exposure to sunlight can augment the felt heat, leading to a potential increase in the heat index by 15 Fahrenheit (8 Celsius) degrees. Heat index values hold particular significance for children. Youngsters often neglect the necessity for rest and hydration. Thirst is a sign of advancing dehydration - thus the importance of maintaining hydration, specifically during long-lasting physical activities.
The primary way humans combat excessive warmth is by perspiring, letting sweat evaporate and cool the body. Under high air temperature and humidity (high heat index) conditions, perspiration is limited, and the perception of heat is increased. Temperature imbalances caused by excessive heat retention can trigger heat-related maladies.
Humidity
The average relative humidity in January in Nuku'alofa is 77%.
Rainfall
In Nuku'alofa, in January, during 17 rainfall days, 174mm (6.85") of precipitation is typically accumulated. Throughout the year, in Nuku'alofa, there are 180 rainfall days, and 1721mm (67.76") of precipitation is accumulated.
Sea temperature
In Nuku'alofa, in January, the average water temperature is 27.7°C (81.9°F).
Note: Between 25°C (77°F) and 29°C (84.2°F), water temperature is typically considered very warm and pleasurable by everyone. Water activities at these temperatures are enjoyable for extended periods without discomfort.
Daylight
In January, the average length of the day in Nuku'alofa, Tonga, is 13h and 14min.
On the first day of the month, sunrise is at 06:02 and sunset at 19:26. On the last day of January, sunrise is at 06:22 and sunset at 19:25 +13.
Sunshine
January and
March, with an average of 18h of sunshine, are months with the most sunshine in Nuku'alofa.
UV index
The months with the highest UV index are January through March,
November and
December, with an average maximum UV index of 12. A UV Index estimate of 11, and higher, represents an ultimate health vulnerability from exposure to the Sun's UV radiation for average individuals.
Note: The maximum UV index of 12 during January leads to these instructions:
Take all required precautions, as unprotected skin and eyes can burn in minutes. Stay in the shade and limit direct Sun exposure from 10 a.m. to 4 p.m., a time when UV radiation is particularly strong. Remember, however, that shade structures may not provide complete protection. It's wise to wear UVA and UVB-blocking sunglasses when the sun shines brightly. After a swim or an outdoor workout, generously apply and reapply a broad-spectrum SPF 30+ sunscreen. Stay aware! UV radiation is magnified when reflecting off sand and water.