January weather forecast
Caldera, Costa Rica

January is a hot winter month in Caldera, Costa Rica, with an average temperature ranging between min 21.9°C (71.4°F) and max 30.8°C (87.4°F).

Temperature

January's beginning signals an average high-temperature of a tropical 30.8°C (87.4°F), barely different from December's 29.7°C (85.5°F). In Caldera, an average low-temperature of 21.9°C (71.4°F) is recorded during January nights.

Heat index

During January, the heat index is appraised at a fiery hot 36°C (96.8°F). Incorporate additional preventive steps, heat exhaustion and heat cramps are possible. Long-lasting activity may cause heatstroke.
Heat index's context suggests values are appropriate for shady areas and slight breezes. Exposure to direct sunshine can increase heat index values by up to 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'felt air temperature' or 'real feel', reflects the blend of air temperature and relative humidity to give a temperature impression. A person's impression of weather can be swayed by numerous aspects, among them metabolic variations, pregnancy, and activity levels. Taking into account that direct sunlight can boost the heat effect, the heat index may rise by up to 15 Fahrenheit (8 Celsius) degrees. Heat index values are primarily vital for children. Typically, children face more danger than adults as they usually perspire less. Their larger skin surface relative to their small bodies and increased heat output from their activities enhance their risk.
The natural method the human body uses to remove excess heat is by perspiring and letting sweat evaporate. An increase in relative humidity disrupts body cooling by slowing the evaporation rate, thereby reducing the rate at which the body cools and amplifying the sense of heat. Exceeding the body's heat disposal threshold results in a rise in body temperature and potential thermal disorders.

Humidity

In January, the average relative humidity in Caldera, Costa Rica, is 68%.

Rainfall

In January, in Caldera, the rain falls for 3.8 days. Throughout January, 4mm (0.16") of precipitation is accumulated. Throughout the year, there are 218.6 rainfall days, and 1456mm (57.32") of precipitation is accumulated.

Daylight

In Caldera, the average length of the day in January is 11h and 37min.
On the first day of the month, sunrise is at 05:55 and sunset at 17:29. On the last day of January, in Caldera, sunrise is at 06:01 and sunset at 17:43 CST.

Sunshine

The average sunshine in January is 8.3h.

UV index

January through September and December, with an average maximum UV index of 7, are months with the highest UV index in Caldera. A UV Index reading of 6 to 7 represents a high health vulnerability from unprotected exposure to Sun's UV rays for the average person.
Note: The maximum daily UV index of 7 in January interprets into the following recommendations:
Inhibit overexposure. Warding off sun damage is of utmost importance. Avoid direct sunlight between the hours of 10 a.m. and 4 p.m., when UV radiation is at its peak. Keep in mind that shade structures may not provide complete protection. Shield yourself from the harmful effects of UV radiation with sun-protective attire, a hat, and quality sunglasses.