December weather forecastIshikari, Japan

December

Weather in December

December, the first month of the winter in Ishikari, is still a freezing cold month, with an average temperature ranging between min -4.7°C (23.5°F) and max -0.4°C (31.3°F).

Temperature

A subtle decrease in the average high-temperature marks December, falling from November's chilly 6.1°C (43°F) to a freezing cold -0.4°C (31.3°F). Nights in December cool down in Ishikari, indicating a minor disparity from daytime highs with an average low-temperature of -4.7°C (23.5°F).

Humidity

In December, the average relative humidity is 84%.

Rainfall

In December, the rain falls for 9.7 days. Throughout December, 84mm (3.31") of precipitation is accumulated. In Ishikari, during the entire year, the rain falls for 169.9 days and collects up to 854mm (33.62") of precipitation.

Snowfall

Months with snowfall are January through May, October through December. In Ishikari, during December, snow falls for 23.7 days and regularly aggregates up to 345mm (13.58") of snow. In Ishikari, Japan, during the entire year, snow falls for 111.1 days and aggregates up to 1455mm (57.28") of snow.

Sea temperature

In December, the average sea temperature is 8.8°C (47.8°F).
Note: Dipping into 8.8°C (47.8°F) below 10°C (50°F) needs protective wear, or you'd face cold shock and breathing issues swiftly. Meanwhile, a slight swim around 13°C (55.4°F) feels cold to the bone.

Daylight

The month with the shortest days in Ishikari is December, with an average of 9h and 6min of daylight.
On the first day of December, sunrise is at 06:46 and sunset at 16:00. On the last day of the month, sunrise is at 07:06 and sunset at 16:09 JST.

Sunshine

In Ishikari, the average sunshine in December is 2.4h.

UV index

The months with the lowest UV index in Ishikari are January, February, November and December, with an average maximum UV index of 1. A UV Index reading of 2, and below, represents a low threat to health from unprotected exposure to Sun's UV rays for the ordinary person.
Note: The UV index of 1 during December leads to these advisories:
Children must always have sun protection, unlike most people, who can tolerate up to an hour in the sun without any burns. The solar radiation is most powerful near the mid-day, so the exposure to the direct Sun should be reduced accordingly. Employ a hat with a wide brim for robust protection, cutting UV exposure by half. Heads up! The UV radiation from the Sun can almost be doubled by snow reflection.

Updated: Jan 31, 2024
Published by: Weather Atlas | About Us
Data Sources | Weather Forecasting & Climate

Frequently asked questions

The average high-temperature, in December, in Ishikari, is -0.4°C (31.3°F), while the average low-temperature is -4.7°C (23.5°F).

The average relative humidity in December is 84%.

In Ishikari, in December, during 9.7 rainfall days, 84mm (3.31") of precipitation is typically accumulated.

In Ishikari, Japan, in December, snow falls for 23.7 days, with typically accumulated 345mm (13.58") of snow.

In December, the average sea temperature in Ishikari is 8.8°C (47.8°F). Swimming in 8.8°C (47.8°F) is considered life-threatening. Even a few minutes in 13°C (55.4°F) water is uncomfortable, and swimming below 10°C (50°F) may cause total loss of breathing control and cold shock, depending on a person's physique.

With an average of 9h and 6min of daylight, December has the shortest days of the year in Ishikari, Japan.

The average day length in December in Ishikari, Japan, is 9h and 4min.

On the first day of December in Ishikari, Japan, sunrise is at 06:46 and sunset at 16:00. On the last day of the month, sunrise is at 07:06 and sunset at 16:09 JST.

In December, the average sunshine duration in Ishikari, Japan, is 2.4h.

January, February, November and December, with an average maximum UV index of 1, are months with the lowest UV index.

In Ishikari, Japan, the average daily maximum UV index in December is 1. A UV Index of 2, and less, symbolizes a low health risk from exposure to Sun's UV rays.

Today

Tomorrow

Long-term

Year J F M A M J J A S O N December

Nov

December

Jan

Average high temperature

6.1°C

-0.4°C

-2.8°C

Average low temperature

Average pressure

Average wind speed

Average max. wind speed

16.9km/h

18.6km/h

16.7km/h

Average wind speed gusts

Average humidity

Average rainfall

Average rainfall days

Average snowfall

Average snowfall days

23.7

27.6

Average sea temperature

Average daylight

Average sunshine

Average sunshine days

5.5

2.2

2.5

Average UV index

Average cloud cover

Average visibility

Average temperature in December
Ishikari, Japan

Average high temperature in December: -0.4°C

The warmest month (with the highest average high temperature) is August (23.7°C).
The month with the lowest average high temperature is January (-2.8°C).

Average low temperature in December: -4.7°C

The month with the highest average low temperature is August (17°C).
The coldest month (with the lowest average low temperature) is February (-8.5°C).

Average pressure in December
Ishikari, Japan

Average pressure in December: 1012.9mbar

The month with the highest atmospheric pressure is November (1016mbar).
The month with the lowest atmospheric pressure is July (1008.5mbar).

Average wind speed in December
Ishikari, Japan

Average wind speed in December: 16.9km/h

The windiest month (with the highest average wind speed) is December (16.9km/h).
The calmest months (with the lowest average wind speed) are July and August (10.1km/h).

Average humidity in December
Ishikari, Japan

Average humidity in December: 84%

The months with the highest relative humidity are January and July (87%).
The months with the lowest relative humidity are April and October (77%).

Average rainfall in December
Ishikari, Japan

Average rainfall in December: 84mm

The wettest month (with the highest rainfall) is August (123mm).
The driest month (with the least rainfall) is April (45mm).

Average rainfall days in December
Ishikari, Japan

Average rainfall days in December: 9.7 days

The month with the highest number of rainy days is July (19.9 days).
The month with the least rainy days is January (4.5 days).

Average snowfall in December
Ishikari, Japan

Average snowfall in December: 345mm

The month with the highest snowfall is January (377mm).
The months with the least snowfall are June, July, August and September (0mm).

Average snowfall days in December
Ishikari, Japan

Average snowfall days in December: 23.7 days

The month with the highest number of snowfall days is January (27.6 days).
The months with the least snowfall days are June, July, August and September (0 days).

Average sea temperature in December
Ishikari, Japan

Average sea temperature in December: 8.8°C

The best month for swimming (with the highest average sea temperature) is August (21.6°C).
The coldest months (with the lowest average sea temperature) are February and March (5.3°C).

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

Average daylight in December: 9h and 6min

The month with the longest days is June (Average daylight: 15h and 18min).
The month with the shortest days is December (Average daylight: 9h and 6min).

Average sunshine in December: 2h and 24min

The months with the most sunshine are May and August (Average sunshine: 9h and 0min).
The month with the least sunshine is January (Average sunshine: 2h and 0min).

Average sunshine days in December
Ishikari, Japan

Average sunshine days in December: 2.2 days

The month with the most sunshine days is May (12.1 days).
The month with the least sunshine days is December (2.2 days).

Average UV index in December
Ishikari, Japan

Average UV index in December: 1

The month with the highest UV index is July (UV index 6).
The months with the lowest UV index are January, February, November and December (UV index 1).