Contents
- Weather in December
- Frequently asked questions
- Average temperature in December
- Average pressure in December
- Average wind speed in December
- Average humidity in December
- Average rainfall in December
- Average rainfall days in December
- Average snowfall in December
- Average snowfall days in December
- Average sea temperature in December
- Average daylight in December
- Average sunshine in December
- Average sunshine days in December
- Average UV index in December
- Average cloud cover in December
- Average visibility in December
December
Weather in December
Temperature
The arrival of December corresponds with a shift in temperature, down from a refreshing 16.5°C (61.7°F) in November to a cool 10.8°C (51.4°F). Kosai observes an average low-temperature of 6.3°C (43.3°F) during the slightly cooler nights of December.Humidity
In December, the average relative humidity is 70%.Rainfall
In Kosai, in December, it is raining for 10.3 days, with typically 37mm (1.46") of accumulated precipitation. Throughout the year, there are 163.7 rainfall days, and 1017mm (40.04") of precipitation is accumulated.Snowfall
Months with snowfall in Kosai are January, February and December. December is the first month it typically snows. Throughout December, in the average 0.5 snowfall days, it receives 1mm (0.04") of snow. Throughout the year, in Kosai, there are 2.5 snowfall days, and 4mm (0.16") of snow is accumulated.Sea temperature
In Kosai, the average seawater temperature in December is 17.4°C (63.3°F).Note: For most individuals, swimming in 17.4°C (63.3°F) is not a pleasant experience. The difficulty in managing breathing increases as the temperature decreases from 21°C (69.8°F) to 15°C (59°F).
Daylight
December has the shortest days of the year, with an average of 9h and 54min of daylight.On the first day of the month, sunrise is at 06:38 and sunset at 16:39. On the last day of December, sunrise is at 06:56 and sunset at 16:48 JST.
Sunshine
In Kosai, the average sunshine in December is 6.2h.UV index
The average daily maximum UV index in December is 3. A UV Index value of 3 to 5 symbolizes a moderate health risk from unsafe exposure to UV radiation for ordinary individuals.Note: The maximum UV index, 3 during December, leads to the following recommendations:
Take necessary precautions - Suggestions to elude sunburn are provided. The mid-day Sun emits the most powerful UV radiation, so seek shade and minimize exposure. Sun-protective clothing, a long-sleeved shirt and pants, a wide-brimmed hat, and UVA and UVB-blocking sunglasses are particularly helpful in blocking UV radiation's harmful effects. Alert! The snow's reflection can amplify the UV radiation of the Sun nearly twice.
Published by: Weather Atlas | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
What is the average December temperature in Kosai?
What is the average humidity in December?
How many days does it rain in December?
When does it start to snow?
What is the sea water temperature in December?
What is the month with the shortest days?
How many hours of daylight does Kosai have in December?
When is the sunrise / sunset in December?
How many hours of sunshine does Kosai have in December?
What is the UV index reading in December?
Average temperature in December
Kosai, Japan
- Average high temperature in December: 10.8°C
The warmest month (with the highest average high temperature) is August (29.1°C).
The month with the lowest average high temperature is January (8.4°C).
- Average low temperature in December: 6.3°C
The month with the highest average low temperature is August (24.8°C).
The coldest month (with the lowest average low temperature) is January (3.5°C).
Average pressure in December
Kosai, Japan
- Average pressure in December: 1017.9mbar
The month with the highest atmospheric pressure is November (1018.7mbar).
The month with the lowest atmospheric pressure is June (1009.1mbar).
Average wind speed in December
Kosai, Japan
- Average wind speed in December: 23.1km/h
The windiest month (with the highest average wind speed) is January (24.2km/h).
The calmest months (with the lowest average wind speed) are July and August (12.8km/h).
Average humidity in December
Kosai, Japan
- Average humidity in December: 70%
The month with the highest relative humidity is July (83%).
The months with the lowest relative humidity are January and February (67%).
Average rainfall in December
Kosai, Japan
- Average rainfall in December: 37mm
The wettest month (with the highest rainfall) is July (190mm).
The driest month (with the least rainfall) is January (27mm).
Average rainfall days in December
Kosai, Japan
- Average rainfall days in December: 10.3 days
The month with the highest number of rainy days is July (20.6 days).
The month with the least rainy days is January (7.5 days).
Average snowfall in December
Kosai, Japan
- Average snowfall in December: 1mm
The month with the highest snowfall is February (2mm).
The months with the least snowfall are March, April, May, June, July, August, September, October and November (0mm).
Average snowfall days in December
Kosai, Japan
- Average snowfall days in December: 0.5 days
The month with the highest number of snowfall days is February (0.9 days).
The months with the least snowfall days are April, May, June, July, August, September, October and November (0 days).
Average sea temperature in December
Kosai, Japan
- Average sea temperature in December: 17.4°C
The best month for swimming (with the highest average sea temperature) is August (26.8°C).
The coldest month (with the lowest average sea temperature) is March (15.1°C).
Average daylight in December /
Average sunshine in December
Kosai, Japan
- Average daylight in December: 9h and 5min
The month with the longest days is June (Average daylight: 14h and 24min).
The month with the shortest days is December (Average daylight: 9h and 54min).
- Average sunshine in December: 6h and 1min
The month with the most sunshine is August (Average sunshine: 10h and 48min).
The month with the least sunshine is February (Average sunshine: 5h and 54min).
Average sunshine days in December
Kosai, Japan
- Average sunshine days in December: 17.3 days
The month with the most sunshine days is January (19.9 days).
The month with the least sunshine days is July (8.7 days).
Average UV index in December
Kosai, Japan
- Average UV index in December: 3
The months with the highest UV index are July and August (UV index 7).
The month with the lowest UV index is January (UV index 2).
Average cloud cover in December
Kosai, Japan
- Average cloud cover in December: 30
The month with the most cloud cover is June (Cloud cover 43).
The month with the least cloud cover is January (Cloud cover 28).
Average visibility in December
Kosai, Japan
- Average visibility in December: 10km
The months with the highest visibility are January, February, March, April, May, June, August, September, October, November and December (10km).
The month with the lowest visibility is July (9km).
