Contents
- Weather in January
- Frequently asked questions
- Average temperature in January
- Average pressure in January
- Average wind speed in January
- Average humidity in January
- Average rainfall in January
- Average rainfall days in January
- Average daylight in January
- Average sunshine in January
- Average sunshine days in January
- Average UV index in January
- Average cloud cover in January
- Average visibility in January
January
Weather in January
Temperature
Hiriwadunna experiences its coldest period in January and December, averaging a high-temperature of 29.3°C (84.7°F).Heat index
The heat index for January is appraised at a sweltering 36°C (96.8°F). More protective measures are required - heat exhaustion and heat cramps are likely. Heatstroke may follow lengthy activity.Take into consideration that the heat index values are calculated for shade and light wind conditions. A rise in the heat index by 15 Fahrenheit (8 Celsius) degrees may result from direct sunlight exposure.
Note: The heat index, also known as 'felt air temperature' or 'real feel', is a metric representing the sensation of warmth when air temperature and moisture come together. This effect tends to be personal, with the weather perception differing among individuals due to variations in body mass, height, and exertion. Direct sun rays can make one feel hotter, potentially raising the heat index by 15 Fahrenheit (8 Celsius) degrees. Heat index values are highly critical to babies and toddlers. Young ones are generally more prone to risk than adults due to their reduced ability to sweat. Their large skin surface area relative to their diminutive bodies and elevated heat production from their activities further enhance this risk.
In the face of high temperatures, the human body's reflex is to perspire, leveraging sweat evaporation for cooling. Under conditions of high temperature and humidity (enhanced heat index), sweat production is compromised, exacerbating the sensation of warmth. Overheating and dehydration threats arise when heat gain goes beyond what the body can comfortably shed.
Humidity
In Hiriwadunna, Sri Lanka, the average relative humidity in January is 82%.Rainfall
In Hiriwadunna, in January, during 16 rainfall days, 42mm (1.65") of precipitation is typically accumulated. Throughout the year, in Hiriwadunna, there are 196.8 rainfall days, and 943mm (37.13") of precipitation is accumulated.Daylight
In January, the average length of the day is 11h and 43min.On the first day of January in Hiriwadunna, sunrise is at 06:20 and sunset at 18:00. On the last day of the month, sunrise is at 06:26 and sunset at 18:13 +0530.
Sunshine
The average sunshine in January is 7.4h.UV index
The months with the lowest UV index in Hiriwadunna are January, November and December, with an average maximum UV index of 6. A UV Index estimate of 6 to 7 represents a high health risk from exposure to the Sun's UV rays for the average person.Note: A daily high UV index of 6 in January leads to these guidelines:
Act on precautions and pay attention to sun safety recommendations. Avoidance of sunburn is obligatory. Avoid exposure to the Sun and try to stay in the shade between 10 a.m. and 4 p.m., when UV radiation is most potent, but be aware that parasols or canopies may not offer full protection. During bright days, sunglasses that offer UVA and UVB defense are recommended.
Published by: Weather Atlas | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
What is the coldest month in Hiriwadunna?
How hot is January in Hiriwadunna?
What is the average humidity in January in Hiriwadunna?
How much does it rain in Hiriwadunna in January?
What is the average length of the day in January in Hiriwadunna?
When is the sunrise / sunset in January in Hiriwadunna?
How long on average sun shines in January in Hiriwadunna?
When is the lowest UV index in Hiriwadunna?
How high is the UV index in January in Hiriwadunna?
Average temperature in January
Hiriwadunna, Sri Lanka
- Average high temperature in January: 29.3°C
The warmest month (with the highest average high temperature) is April (34.9°C).
The months with the lowest average high temperature are January and December (29.3°C).
- Average low temperature in January: 20°C
The month with the highest average low temperature is June (24.8°C).
The coldest months (with the lowest average low temperature) are January and February (20°C).
Average pressure in January
Hiriwadunna, Sri Lanka
- Average pressure in January: 1012mbar
The month with the highest atmospheric pressure is January (1012mbar).
The month with the lowest atmospheric pressure is June (1007.5mbar).
Average wind speed in January
Hiriwadunna, Sri Lanka
- Average wind speed in January: 9.9km/h
The windiest month (with the highest average wind speed) is June (23.8km/h).
The calmest month (with the lowest average wind speed) is April (7.1km/h).
Average humidity in January
Hiriwadunna, Sri Lanka
- Average humidity in January: 82%
The month with the highest relative humidity is December (84%).
The months with the lowest relative humidity are June, July, August and September (67%).
Average rainfall in January
Hiriwadunna, Sri Lanka
- Average rainfall in January: 42mm
The wettest month (with the highest rainfall) is October (214mm).
The driest month (with the least rainfall) is June (15mm).
Average rainfall days in January
Hiriwadunna, Sri Lanka
- Average rainfall days in January: 16 days
The month with the highest number of rainy days is November (24.1 days).
The month with the least rainy days is June (7.8 days).
Average daylight in January /
Average sunshine in January
Hiriwadunna, Sri Lanka
- Average daylight in January: 11h and 4min
The month with the longest days is June (Average daylight: 12h and 36min).
The month with the shortest days is December (Average daylight: 11h and 42min).
- Average sunshine in January: 7h and 2min
The month with the most sunshine is June (Average sunshine: 11h and 18min).
The month with the least sunshine is December (Average sunshine: 4h and 54min).
Average sunshine days in January
Hiriwadunna, Sri Lanka
- Average sunshine days in January: 11.7 days
The month with the most sunshine days is July (16 days).
The month with the least sunshine days is November (4.2 days).
Average UV index in January
Hiriwadunna, Sri Lanka
- Average UV index in January: 6
The months with the highest UV index are February, March, April, May, June, July, August, September and October (UV index 7).
The months with the lowest UV index are January, November and December (UV index 6).
Average cloud cover in January
Hiriwadunna, Sri Lanka
- Average cloud cover in January: 49
The month with the most cloud cover is December (Cloud cover 56).
The month with the least cloud cover is May (Cloud cover 26).
Average visibility in January
Hiriwadunna, Sri Lanka
- Average visibility in January: 7km
The months with the highest visibility are May, June, July, August and September (10km).
The months with the lowest visibility are January and December (7km).
