December weather forecast
Kumamoto, Japan

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Weather in December

As the year winds down, December brings winter to Kumamoto with a substantial dip in temperature, as the city alternates between a high of 10.4°C (50.7°F) and a low of 4.4°C (39.9°F). Along with a substantial drop in sea temperature, the colder weather is quite observable. Though snowfall is less frequent compared to January, a light flurry isn't uncommon towards the month's end. Despite fewer daylight hours, clear visibility enhances the city's aesthetic appeal.

Temperature

Kumamoto's progression into December includes a drop in the average high-temperature, from a refreshing 16.5°C (61.7°F) in November to a fresh 10.4°C (50.7°F). During the month of December, an average temperature of 4.4°C (39.9°F) is noted during the nights.

Humidity

The average relative humidity in December is 75%.

Rainfall

In Kumamoto, in December, it is raining for 12.1 days, with typically 49mm (1.93") of accumulated precipitation. Throughout the year, there are 179.9 rainfall days, and 1028mm (40.47") of precipitation is accumulated.

Snowfall

Months with snowfall in Kumamoto are January through March and December. December is the first month it typically snows in Kumamoto, Japan. Throughout December, in the average 1.6 snowfall days, it receives 13mm (0.51") of snow. Throughout the year, there are 7 snowfall days, and 38mm (1.5") of snow is accumulated.

Sea temperature

In Kumamoto, the average seawater temperature in December is 21°C (69.8°F).
Note: Swimming is not a pleasant activity for most individuals in 21°C (69.8°F). Breathing becomes increasingly challenging to control as the water temperature dips from 21°C (69.8°F) to 15°C (59°F).

Daylight

December has the shortest days of the year, with an average of 10h and 0min of daylight.
On the first day of the month, sunrise is at 07:01 and sunset at 17:10. On the last day of December, in Kumamoto, sunrise is at 07:19 and sunset at 17:21 JST.

Sunshine

In December, the average sunshine in Kumamoto is 5.3h.

UV index

January and December, with an average maximum UV index of 2, are months with the lowest UV index. A UV Index of 2, and less, symbolizes a low health risk from unprotected exposure to Sun's UV rays for the average person.
Note: The UV index of 2 during December leads to these advisories:
While most people can stay under the sun for an hour without burning, children must always be guarded against sun exposure. For health reasons, it's advisable to reduce direct sun exposure during peak hours around midday. Stay sun-safe with clothing that is both closely woven and worn loosely. Keep in mind! Snow's reflective quality can nearly double the intensity of the Sun's UV radiation.

Frequently asked questions

What is the average December temperature in Kumamoto?

In December, the average high-temperature and low-temperature in Kumamoto, Japan, are 10.4°C (50.7°F) and 4.4°C (39.9°F) respectively. In August, the average heat index (a.k.a. 'real feel', 'felt air temperature'), which factors the actual air temperature with the relative humidity, is computed to be 38°C (100.4°F).

What is the average humidity in December in Kumamoto?

The average relative humidity in December is 75%.

How much does it rain in Kumamoto in December?

In Kumamoto, Japan, in December, during 12.1 rainfall days, 49mm (1.93") of precipitation is typically accumulated.

When does it start to snow in Kumamoto?

December is the first month it typically snows. Throughout December, in the average 1.6 snowfall days, it receives 13mm (0.51") of snow.

What is the sea temperature in December in Kumamoto?

In December, the average sea temperature in Kumamoto is 21°C (69.8°F). For swimming, a surface water temperature of 21°C (69.8°F) is not enjoyable for the majority. It is not considered safe, as controlling breathing becomes progressively more difficult as water temperature decreases below 21°C (69.8°F).

What is the month with the shortest days in Kumamoto?

With an average of 10h and 0min of daylight, December has the shortest days of the year in Kumamoto, Japan.

How many hours of daylight does Kumamoto have in December?

In December, the average day length in Kumamoto, Japan, is 10h and 2min.

What time are sunrise and sunset in December in Kumamoto?

In December, on the first day of the month, sunrise is at 07:01 and sunset at 17:10. On the last day of the month, in Kumamoto, sunrise is at 07:19 and sunset at 17:21 JST.

How many hours of sunshine does Kumamoto have in December?

In Kumamoto, the average sunshine duration in December is 5.3h.

When is the lowest UV index in Kumamoto?

The months with the lowest UV index are January and December, with an average maximum UV index of 2.

What is the UV index reading in December in Kumamoto?

In December, the average daily maximum UV index in Kumamoto, Japan, is 2. A UV Index reading of 2, and below, represents a low health threat from unsafe exposure to Sun's UV rays.
Average humidity
Average rainfall days
Average snowfall days
Average daylight
Average sunshine
Average sunshine days
Average UV index
Average cloud cover

Average temperature in December
Kumamoto, Japan

Average temperature in December - Kumamoto, Japan
  • Average high temperature in December: 10.4°C

The warmest month (with the highest average high temperature) is August (30.4°C).
The month with the lowest average high temperature is January (8.3°C).

  • Average low temperature in December: 4.4°C

The month with the highest average low temperature is August (23.3°C).
The coldest month (with the lowest average low temperature) is January (1.7°C).

Average pressure in December
Kumamoto, Japan

Average pressure in December - Kumamoto, Japan
  • Average pressure in December: 1021.2mbar

The month with the highest atmospheric pressure is January (1021.8mbar).
The month with the lowest atmospheric pressure is June (1008.2mbar).

Average wind speed in December
Kumamoto, Japan

Average wind speed in December - Kumamoto, Japan
  • Average wind speed in December: 8.1km/h

The windiest month (with the highest average wind speed) is March (8.7km/h).
The calmest month (with the lowest average wind speed) is June (7km/h).

Average humidity in December
Kumamoto, Japan

Average humidity in December - Kumamoto, Japan
  • Average humidity in December: 75%

The month with the highest relative humidity is July (83%).
The months with the lowest relative humidity are March and April (72%).

Average rainfall in December
Kumamoto, Japan

Average rainfall in December - Kumamoto, Japan
  • Average rainfall in December: 49mm

The wettest month (with the highest rainfall) is June (216mm).
The driest month (with the least rainfall) is January (36mm).

Average rainfall days in December
Kumamoto, Japan

Average rainfall days in December - Kumamoto, Japan
  • Average rainfall days in December: 12.1 days

The month with the highest number of rainy days is July (23.4 days).
The month with the least rainy days is January (10.5 days).

Average snowfall in December
Kumamoto, Japan

Average snowfall in December - Kumamoto, Japan
  • Average snowfall in December: 13mm

The month with the highest snowfall is January (16mm).
The months with the least snowfall are April, May, June, July, August, September, October and November (0mm).

Average snowfall days in December
Kumamoto, Japan

Average snowfall days in December - Kumamoto, Japan
  • Average snowfall days in December: 1.6 days

The month with the highest number of snowfall days is January (3.3 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
Kumamoto, Japan

Average sea temperature in December - Kumamoto, Japan
  • Average sea temperature in December: 21°C

The best month for swimming (with the highest average sea temperature) is August (28°C).
The coldest months (with the lowest average sea temperature) are February and March (18°C).

Average daylight in December /
Average sunshine in December
Kumamoto, Japan

Average daylight in December / Average sunshine in December - Kumamoto, Japan
  • Average daylight in December: 10h and 0min

The month with the longest days is June (Average daylight: 14h and 18min).
The month with the shortest days is December (Average daylight: 10h and 0min).

  • Average sunshine in December: 5h and 2min

The month with the most sunshine is August (Average sunshine: 10h and 30min).
The month with the least sunshine is January (Average sunshine: 5h and 6min).

Average sunshine days in December
Kumamoto, Japan

Average sunshine days in December - Kumamoto, Japan
  • Average sunshine days in December: 16 days

The month with the most sunshine days is October (18.1 days).
The month with the least sunshine days is July (4.9 days).

Average UV index in December
Kumamoto, Japan

Average UV index in December - Kumamoto, 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
Kumamoto, Japan

Average cloud cover in December - Kumamoto, Japan
  • Average cloud cover in December: 41

The month with the most cloud cover is June (Cloud cover 50).
The month with the least cloud cover is October (Cloud cover 31).

Average visibility in December
Kumamoto, Japan

Average visibility in December - Kumamoto, Japan
  • Average visibility in December: 9km

The month with the highest visibility is November (10km).
The months with the lowest visibility are June and July (8km).

Kumamoto, Japan

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