December weather forecastChatan, Japan
December
Weather in December
The first month of the winter, December, is also an agreeable month in Chatan, Japan, with an average temperature ranging between min 18.6°C (65.5°F) and max 20.5°C (68.9°F).Temperature
With the arrival of December, Chatan experiences a modest decline in average high-temperatures, transitioning from a warm 23.9°C (75°F) in November to a pleasant 20.5°C (68.9°F). During the month of December, Chatan identifies an average nighttime low-temperature of 18.6°C (65.5°F), slightly lower than its daytime counterpart.Humidity
In December, the average relative humidity in Chatan is 73%.Rainfall
In Chatan, in December, during 18.5 rainfall days, 68mm (2.68") of precipitation is typically accumulated. In Chatan, Japan, during the entire year, the rain falls for 215.5 days and collects up to 1300mm (51.18") of precipitation.Sea temperature
In Chatan, in December, the average water temperature is 23.7°C (74.7°F).Note: Factor in your tolerance to cold, the sunshine, the wind, and the air's warmth, and a swim in 23.7°C (74.7°F) might be tempting. It is interesting to note that Olympians compete in 25°C (77°F) to 28°C (82.4°F) water temperatures.
Daylight
The month with the shortest days in Chatan, Japan, is December, with an average of 10h and 30min of daylight.On the first day of the month, sunrise is at 06:59 and sunset at 17:36. On the last day of December, in Chatan, sunrise is at 07:16 and sunset at 17:47 JST.
Sunshine
In Chatan, the average sunshine in December is 4.4h.UV index
December is the month with the lowest UV index in Chatan, with an average maximum UV index of 4. A UV Index estimate of 3 to 5 represents a medium vulnerability from unprotected exposure to Sun's UV rays for the average person.Note: The maximum daily UV index, 4 in December, converts into the following recommendations:
Take measures. Individuals with light skin might experience burns in under 30 minutes. Avoiding direct sunlight during midday hours helps reduce the risk from intense UV radiation. Prioritize a wide-brim hat for comprehensive sun defense for your face, neck, eyes, and ears. Take note! Sand and water reflections strengthen the Sun's UV exposure.
Published by: Weather Atlas | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in December
Chatan, Japan
- Average high temperature in December: 20.5°C
The warmest month (with the highest average high temperature) is August (29.5°C).
The month with the lowest average high temperature is January (18.8°C).
- Average low temperature in December: 18.6°C
The month with the highest average low temperature is August (28.2°C).
The coldest month (with the lowest average low temperature) is January (16.8°C).
Average pressure in December
Chatan, Japan
- Average pressure in December: 1019.9mbar
The month with the highest atmospheric pressure is January (1020.9mbar).
The month with the lowest atmospheric pressure is August (1006.6mbar).
Average wind speed in December
Chatan, Japan
- Average wind speed in December: 27.6km/h
The windiest month (with the highest average wind speed) is December (27.6km/h).
The calmest month (with the lowest average wind speed) is May (19.5km/h).
Average humidity in December
Chatan, Japan
- Average humidity in December: 73%
The month with the highest relative humidity is June (86%).
The month with the lowest relative humidity is January (72%).
Average rainfall in December
Chatan, Japan
- Average rainfall in December: 68mm
The wettest month (with the highest rainfall) is June (198mm).
The driest months (with the least rainfall) are January and February (53mm).
Average rainfall days in December
Chatan, Japan
- Average rainfall days in December: 18.5 days
The month with the highest number of rainy days is October (19.7 days).
The month with the least rainy days is July (16.1 days).
Average sea temperature in December
Chatan, Japan
- Average sea temperature in December: 23.7°C
The best month for swimming (with the highest average sea temperature) is August (28.7°C).
The coldest month (with the lowest average sea temperature) is February (20.9°C).
Average daylight in December /
Average sunshine in December
Chatan, Japan
- Average daylight in December: 10h and 30min
The month with the longest days is June (Average daylight: 13h and 48min).
The month with the shortest days is December (Average daylight: 10h and 30min).
- Average sunshine in December: 4h and 24min
The month with the most sunshine is July (Average sunshine: 10h and 30min).
The month with the least sunshine is January (Average sunshine: 4h and 18min).
Average sunshine days in December
Chatan, Japan
- Average sunshine days in December: 9.1 days
The month with the most sunshine days is July (12.6 days).
The month with the least sunshine days is September (7.1 days).
Average UV index in December
Chatan, Japan
- Average UV index in December: 4
The months with the highest UV index are June, July, August and September (UV index 7).
The month with the lowest UV index is December (UV index 4).
Average cloud cover in December
Chatan, Japan
- Average cloud cover in December: 57
The month with the most cloud cover is January (Cloud cover 63).
The month with the least cloud cover is July (Cloud cover 34).
Average visibility in December
Chatan, Japan
- Average visibility in December: 10km
The months with the highest visibility are January, February, March, April, May, June, July, August, September, October, November and December (10km).
The months with the lowest visibility are January, February, March, April, May, June, July, August, September, October, November and December (10km).
