December weather forecastKoshihara, Japan
December
Weather in December
December, the first month of the winter in Koshihara, is also an agreeable month, with an average temperature fluctuating between 20.6°C (69.1°F) and 18.8°C (65.8°F).Temperature
The arrival of December is marked by a minor reduction in average high-temperature, sliding from a moderately hot 23.9°C (75°F) in November to an agreeable 20.6°C (69.1°F). In Koshihara, December nights maintain a consistent temperature, with an average low of 18.8°C (65.8°F).Humidity
The average relative humidity in December is 73%.Rainfall
In Koshihara, during December, the rain falls for 21.2 days and regularly aggregates up to 81mm (3.19") of precipitation. In Koshihara, during the entire year, the rain falls for 227.4 days and collects up to 1405mm (55.31") of precipitation.Daylight
December has the shortest days of the year in Koshihara, 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 Koshihara, sunrise is at 07:16 and sunset at 17:48 JST.
Sunshine
In December, the average sunshine is 4.4h.UV index
The month with the lowest UV index in Koshihara is December, with an average maximum UV index of 4. A UV Index value of 3 to 5 symbolizes a medium vulnerability from unsafe exposure to UV radiation for the ordinary person.Note: A typical high UV index of 4 in December suggests the following recommendations:
Take necessary precautions - Suggestions to elude sunburn are provided. The midday Sun can be dangerous due to its intense radiation; always find shade and reduce exposure. In bright sunlight, prioritize sunglasses that grant protection from UVA and UVB radiation.
Published by: Weather Atlas | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in December
Koshihara, Japan
- Average high temperature in December: 20.6°C
The warmest month (with the highest average high temperature) is August (29.4°C).
The month with the lowest average high temperature is January (18.9°C).
- Average low temperature in December: 18.8°C
The month with the highest average low temperature is August (28.3°C).
The coldest month (with the lowest average low temperature) is January (17°C).
Average pressure in December
Koshihara, Japan
- Average pressure in December: 1019.8mbar
The month with the highest atmospheric pressure is January (1020.8mbar).
The month with the lowest atmospheric pressure is August (1006.6mbar).
Average wind speed in December
Koshihara, Japan
- Average wind speed in December: 28.4km/h
The windiest month (with the highest average wind speed) is December (28.4km/h).
The calmest month (with the lowest average wind speed) is May (20.1km/h).
Average humidity in December
Koshihara, 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
Koshihara, Japan
- Average rainfall in December: 81mm
The wettest month (with the highest rainfall) is June (201mm).
The driest month (with the least rainfall) is February (59mm).
Average rainfall days in December
Koshihara, Japan
- Average rainfall days in December: 21.2 days
The month with the highest number of rainy days is June (21.5 days).
The month with the least rainy days is July (16.4 days).
Average daylight in December /
Average sunshine in December
Koshihara, Japan
- Average daylight in December: 10h and 30min
The month with the longest days is June (Average daylight: 13h and 42min).
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
Koshihara, Japan
- Average sunshine days in December: 5.7 days
The month with the most sunshine days is July (11.9 days).
The month with the least sunshine days is December (5.7 days).
Average UV index in December
Koshihara, 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
Koshihara, Japan
- Average cloud cover in December: 58
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
Koshihara, 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).
