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 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
A minor decrease in the average high-temperature is observed during December, shifting from a comfortable 17.1°C (62.8°F) in November to a cool 12.5°C (54.5°F). During the month of December, Koyasu's average nighttime temperature closely mirrors its daytime counterpart, at a frosty 8.4°C (47.1°F).Humidity
The average relative humidity in December is 64%.Rainfall
February and December are months with the least rain in Koyasu when the rain falls for 8.7 days and typically aggregates up to 39mm (1.54") of rain.Snowfall
In Koyasu, Japan, snow does not fall in April through December.Daylight
With an average of 9h and 48min of daylight, December has the shortest days of the year.On the first day of December in Koyasu, sunrise is at 06:33 and sunset at 16:30. On the last day of the month, sunrise is at 06:51 and sunset at 16:40 JST.
Sunshine
The average sunshine in December in Koyasu is 6.1h.UV index
The months with the lowest UV index are January, February and December, with an average maximum UV index of 3. A UV Index of 3 to 5 symbolizes a moderate health risk from exposure to the Sun's UV rays for average individuals.Note: In December, the maximum UV index of 3 translates into these guidelines:
Prioritize safety - The need to safeguard skin and eyes from harm is emphasized. Considering the strength of solar radiation at midday, one should avoid direct Sun exposure. To cut down UV radiation exposure by about half, sport a wide-brim hat.
Published by: Weather Atlas | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
What is the temperature in December in Koyasu?
What is the average humidity in December in Koyasu?
What is the driest month in Koyasu?
How much does it rain in Koyasu in December?
When it does not snow in Koyasu?
Does it snow in Koyasu in December?
What is the month with the shortest days in Koyasu?
What is the average length of the day in December in Koyasu?
What time are sunrise and sunset in December in Koyasu?
How many hours of sunshine does Koyasu have in December?
What is the month with the lowest UV index in Koyasu?
How high is the UV index in December in Koyasu?
Average temperature in December
Koyasu, Japan
- Average high temperature in December: 12.5°C
The warmest month (with the highest average high temperature) is August (28.8°C).
The month with the lowest average high temperature is January (9.8°C).
- Average low temperature in December: 8.4°C
The month with the highest average low temperature is August (25.3°C).
The coldest month (with the lowest average low temperature) is January (5.3°C).
Average pressure in December
Koyasu, Japan
- Average pressure in December: 1016.2mbar
The month with the highest atmospheric pressure is November (1017.9mbar).
The month with the lowest atmospheric pressure is June (1009.1mbar).
Average wind speed in December
Koyasu, Japan
- Average wind speed in December: 19.1km/h
The windiest month (with the highest average wind speed) is March (20.8km/h).
The calmest month (with the lowest average wind speed) is June (15.9km/h).
Average humidity in December
Koyasu, Japan
- Average humidity in December: 64%
The month with the highest relative humidity is July (83%).
The month with the lowest relative humidity is January (61%).
Average rainfall in December
Koyasu, Japan
- Average rainfall in December: 39mm
The wettest month (with the highest rainfall) is September (125mm).
The driest months (with the least rainfall) are February and December (39mm).
Average rainfall days in December
Koyasu, Japan
- Average rainfall days in December: 8.7 days
The month with the highest number of rainy days is June (16.5 days).
The month with the least rainy days is January (6.5 days).
Average snowfall in December
Koyasu, Japan
- Average snowfall in December: 0mm
The month with the highest snowfall is February (10mm).
The months with the least snowfall are April, May, June, July, August, September, October, November and December (0mm).
Average snowfall days in December
Koyasu, Japan
- Average snowfall days in December: 0 days
The month with the highest number of snowfall days is February (0.5 days).
The months with the least snowfall days are April, May, June, July, August, September, October, November and December (0 days).
Average daylight in December /
Average sunshine in December
Koyasu, Japan
- Average daylight in December: 9h and 5min
The month with the longest days is June (Average daylight: 14h and 30min).
The month with the shortest days is December (Average daylight: 9h and 48min).
- Average sunshine in December: 6h and 1min
The month with the most sunshine is August (Average sunshine: 10h and 42min).
The month with the least sunshine is February (Average sunshine: 5h and 30min).
Average sunshine days in December
Koyasu, Japan
- Average sunshine days in December: 21.3 days
The month with the most sunshine days is January (23.2 days).
The month with the least sunshine days is September (11.2 days).
Average UV index in December
Koyasu, Japan
- Average UV index in December: 3
The month with the highest UV index is July (UV index 7).
The months with the lowest UV index are January, February and December (UV index 3).
Average cloud cover in December
Koyasu, Japan
- Average cloud cover in December: 31
The months with the most cloud cover are March, June and October (Cloud cover 43).
The month with the least cloud cover is August (Cloud cover 29).
Average visibility in December
Koyasu, 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).
