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
Weather in December
Temperature
December ushers in a minute temperature change, with average high-temperatures reducing from November's comfortable 17°C (62.6°F) to a fresh 12.3°C (54.1°F). Sanmu nights in December witness a mild cool down to an average temperature of 7.9°C (46.2°F).Humidity
The average relative humidity in December is 65%.Rainfall
In Sanmu, during December, the rain falls for 11.3 days and regularly aggregates up to 54mm (2.13") of precipitation. Throughout the year, in Sanmu, there are 173.1 rainfall days, and 1019mm (40.12") of precipitation is accumulated.Snowfall
In Sanmu, snow does not fall in March through December.Daylight
December has the shortest days of the year, with an average of 9h and 48min of daylight.On the first day of the month, sunrise is at 06:29 and sunset at 16:25. On the last day of December, sunrise is at 06:47 and sunset at 16:35 JST.
Sunshine
In Sanmu, the average sunshine in December is 5.8h.UV index
January through March and December, with an average maximum UV index of 3, are months with the lowest UV index. A UV Index reading of 3 to 5 represents a moderate threat to health from unprotected exposure to Sun's UV rays for the ordinary person.Note: An average maximum UV index of 3 in December leads to these recommendations:
Adopt protective measures - It is advised to guard against sun damage. The Sun's most harmful UV rays are emitted around midday; avoid staying outdoors for long during this time. A wide-brim hat offers excellent sun protection for the eyes, ears, face, and neck. Sunglasses with UVA and UVB protection significantly reduce eye damage from sun exposure.
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Data Sources | Weather Forecasting & Climate
Frequently asked questions
What is the average December temperature in Sanmu?
What is the average humidity in December in Sanmu?
How many days does it rain in December in Sanmu?
When it does not snow in Sanmu?
Does it snow in Sanmu in December?
What is the month with the shortest days in Sanmu?
How many hours of daylight does Sanmu have in December?
When is the sunrise / sunset in December in Sanmu?
How many hours of sunshine does Sanmu have in December?
When is the lowest UV index in Sanmu?
What is the UV index reading in December in Sanmu?
Average temperature in December
Sanmu, Japan
- Average high temperature in December: 12.3°C
The warmest month (with the highest average high temperature) is August (29.6°C).
The month with the lowest average high temperature is January (9.5°C).
- Average low temperature in December: 7.9°C
The month with the highest average low temperature is August (25°C).
The coldest month (with the lowest average low temperature) is January (5°C).
Average pressure in December
Sanmu, Japan
- Average pressure in December: 1015.8mbar
The month with the highest atmospheric pressure is November (1017.8mbar).
The month with the lowest atmospheric pressure is June (1009.2mbar).
Average wind speed in December
Sanmu, Japan
- Average wind speed in December: 17.3km/h
The windiest month (with the highest average wind speed) is March (19.4km/h).
The calmest month (with the lowest average wind speed) is June (14.5km/h).
Average humidity in December
Sanmu, Japan
- Average humidity in December: 65%
The month with the highest relative humidity is July (83%).
The month with the lowest relative humidity is January (61%).
Average rainfall in December
Sanmu, Japan
- Average rainfall in December: 54mm
The wettest month (with the highest rainfall) is October (132mm).
The driest month (with the least rainfall) is January (48mm).
Average rainfall days in December
Sanmu, Japan
- Average rainfall days in December: 11.3 days
The month with the highest number of rainy days is June (17.8 days).
The month with the least rainy days is January (8.3 days).
Average snowfall in December
Sanmu, Japan
- Average snowfall in December: 0mm
The month with the highest snowfall is February (12mm).
The months with the least snowfall are March, April, May, June, July, August, September, October, November and December (0mm).
Average snowfall days in December
Sanmu, Japan
- Average snowfall days in December: 0 days
The month with the highest number of snowfall days is February (1.2 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
Sanmu, 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: 5h and 5min
The month with the most sunshine is August (Average sunshine: 10h and 18min).
The month with the least sunshine is February (Average sunshine: 5h and 12min).
Average sunshine days in December
Sanmu, Japan
- Average sunshine days in December: 18.2 days
The month with the most sunshine days is January (21.3 days).
The month with the least sunshine days is June (10 days).
Average UV index in December
Sanmu, 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, March and December (UV index 3).
Average cloud cover in December
Sanmu, Japan
- Average cloud cover in December: 35
The months with the most cloud cover are March, June and October (Cloud cover 47).
The months with the least cloud cover are January and August (Cloud cover 33).
Average visibility in December
Sanmu, 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).
Sanmu, Japan
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