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
Weather in December
Temperature
December's arrival comes with a decrease in the average high-temperature, moving from a refreshing 14.8°C (58.6°F) in November to a frosty 9.4°C (48.9°F). Niihama registers a subtle dip to an average of 4.5°C (40.1°F) during the nights of December.Humidity
In Niihama, the average relative humidity in December is 74%.Rainfall
In Niihama, in December, it is raining for 13.6 days, with typically 63mm (2.48") of accumulated precipitation. In Niihama, during the entire year, the rain falls for 191.4 days and collects up to 1183mm (46.57") of precipitation.Snowfall
January through March and December are months with snowfall in Niihama. December is the first month it typically snows in Niihama. Throughout December, in the average 4.5 snowfall days, it receives 23mm (0.91") of snow. Throughout the year, in Niihama, there are 17.2 snowfall days, and 106mm (4.17") of snow is accumulated.Sea temperature
In Niihama, Japan, the average seawater temperature in December is 19.2°C (66.6°F).Note: Most people do not find swimming enjoyable in water of 19.2°C (66.6°F). The task of controlling breathing becomes tougher as the temperature drops 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 December, sunrise is at 06:54 and sunset at 16:57. On the last day of the month, sunrise is at 07:11 and sunset at 17:07 JST.
Sunshine
January and December, with an average of 5.6h of sunshine, are months with the least sunshine.UV index
January and December, with an average maximum UV index of 2, are months with the lowest UV index. A UV Index estimate of 2, and below, represents a minimal health vulnerability from exposure to the Sun's UV radiation for average individuals.Note: A maximum daily UV index of 2 during December morphs into the following directions:
Apart from children, who require continuous protection, most can endure sun exposure for up to an hour without experiencing burns. The Sun is at its harshest during midday; protect yourself by staying in shaded areas and minimizing exposure. Enhance your sun protection with tightly woven, yet airy clothing. Mind you! Snow reflection can increase the intensity of the Sun's UV radiation nearly twofold.
Frequently asked questions
What is the usual temperature for Niihama in December?
What is the average humidity in December in Niihama?
How much does it rain in Niihama in December?
When does it start to snow in Niihama?
What is the sea water temperature in December in Niihama?
What is the month with the shortest days in Niihama?
How many hours of daylight does Niihama have in December?
When is the sunrise / sunset in December in Niihama?
What are the months with the least sunshine in Niihama?
How long on average sun shines in December in Niihama?
What are the months with the lowest UV index in Niihama?
What is the UV index reading in December in Niihama?
Average temperature in December
Niihama, Japan
- Average high temperature in December: 9.4°C
The warmest month (with the highest average high temperature) is August (28.6°C).
The month with the lowest average high temperature is January (7.3°C).
- Average low temperature in December: 4.5°C
The month with the highest average low temperature is August (23.4°C).
The coldest month (with the lowest average low temperature) is January (2°C).
Average pressure in December
Niihama, Japan
- Average pressure in December: 1020.3mbar
The month with the highest atmospheric pressure is January (1020.7mbar).
The month with the lowest atmospheric pressure is June (1008.5mbar).
Average wind speed in December
Niihama, Japan
- Average wind speed in December: 11.3km/h
The windiest month (with the highest average wind speed) is January (11.4km/h).
The calmest month (with the lowest average wind speed) is June (6km/h).
Average humidity in December
Niihama, Japan
- Average humidity in December: 74%
The month with the highest relative humidity is July (84%).
The month with the lowest relative humidity is March (72%).
Average rainfall in December
Niihama, Japan
- Average rainfall in December: 63mm
The wettest month (with the highest rainfall) is July (187mm).
The driest month (with the least rainfall) is January (46mm).
Average rainfall days in December
Niihama, Japan
- Average rainfall days in December: 13.6 days
The month with the highest number of rainy days is July (23.9 days).
The month with the least rainy days is January (11.3 days).
Average snowfall in December
Niihama, Japan
- Average snowfall in December: 23mm
The month with the highest snowfall is February (40mm).
The months with the least snowfall are April, May, June, July, August, September, October and November (0mm).
Average snowfall days in December
Niihama, Japan
- Average snowfall days in December: 4.5 days
The month with the highest number of snowfall days is January (6.6 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
Niihama, Japan
- Average sea temperature in December: 19.2°C
The best month for swimming (with the highest average sea temperature) is August (27.5°C).
The coldest months (with the lowest average sea temperature) are February and March (15.8°C).
Average daylight in December /
Average sunshine in December
Niihama, 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: 5h and 4min
The month with the most sunshine is August (Average sunshine: 10h and 42min).
The months with the least sunshine are January and December (Average sunshine: 5h and 36min).
Average sunshine days in December
Niihama, Japan
- Average sunshine days in December: 11.9 days
The month with the most sunshine days is May (15.1 days).
The month with the least sunshine days is July (3.8 days).
Average UV index in December
Niihama, Japan
- Average UV index in December: 2
The month with the highest UV index is July (UV index 7).
The months with the lowest UV index are January and December (UV index 2).
Average cloud cover in December
Niihama, Japan
- Average cloud cover in December: 39
The month with the most cloud cover is June (Cloud cover 41).
The months with the least cloud cover are May and August (Cloud cover 31).
Average visibility in December
Niihama, Japan
- Average visibility in December: 10km
The months with the highest visibility are August, September, October, November and December (10km).
The months with the lowest visibility are January, February, March, April, May, June and July (9km).
Niihama, Japan
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