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
The shift from November to December corresponds with a decrease in the average high-temperature, down to a subzero cold -1.3°C (29.7°F) from a wintry 5.5°C (41.9°F). The low-temperature average for Iwamizawa during December stands at -6.5°C (20.3°F).Humidity
In December, the average relative humidity in Iwamizawa is 88%.Rainfall
In Iwamizawa, in December, it is raining for 8.7 days, with typically 73mm (2.87") of accumulated precipitation. In Iwamizawa, during the entire year, the rain falls for 162.3 days and collects up to 769mm (30.28") of precipitation.Snowfall
January through May, October through December are months with snowfall in Iwamizawa. The month with the most snowfall in Iwamizawa is December, when snow falls for 25.1 days and typically aggregates up to 394mm (15.51") of snow.Daylight
With an average of 9h and 6min of daylight, December has the shortest days of the year in Iwamizawa.On the first day of the month, sunrise is at 06:45 and sunset at 15:58. On the last day of December, sunrise is at 07:04 and sunset at 16:07 JST.
Sunshine
The average sunshine in December in Iwamizawa is 2.7h.UV index
The months with the lowest UV index in Iwamizawa, Japan, are January, February, November and December, with an average maximum UV index of 1. A UV Index estimate of 2, and below, represents a low health risk from unsafe exposure to UV radiation for the average person.Note: A maximum high UV index of 1 in December translates into the following recommendations:
Most individuals can handle sun exposure for up to an hour without burning, but children must always be shielded from sun exposure. When the Sun is at its strongest around midday, find shade and limit exposure. Wearing a wide-brim hat can block approximately 50% of UV radiation, protecting the eyes. Be prepared! The intensity of the Sun's UV radiation can be amplified nearly double due to snow reflection.
Frequently asked questions
How cold is it in Iwamizawa in December?
What is the average humidity in December in Iwamizawa?
How many days does it rain in December in Iwamizawa?
What is the snowiest month in Iwamizawa?
How much does it snow in Iwamizawa in December?
What is the month with the shortest days in Iwamizawa?
How many hours of daylight does Iwamizawa have in December?
When is the sunrise / sunset in December in Iwamizawa?
How long on average sun shines in December in Iwamizawa?
What is the month with the lowest UV index in Iwamizawa?
What is the UV index intensity in December in Iwamizawa?
Average temperature in December
Iwamizawa, Japan
- Average high temperature in December: -1.3°C
The warmest month (with the highest average high temperature) is August (24.2°C).
The month with the lowest average high temperature is January (-3.7°C).
- Average low temperature in December: -6.5°C
The month with the highest average low temperature is August (15.8°C).
The coldest month (with the lowest average low temperature) is February (-10.6°C).
Average pressure in December
Iwamizawa, Japan
- Average pressure in December: 1012.8mbar
The month with the highest atmospheric pressure is November (1016mbar).
The month with the lowest atmospheric pressure is July (1008.7mbar).
Average wind speed in December
Iwamizawa, Japan
- Average wind speed in December: 11.8km/h
The windiest month (with the highest average wind speed) is April (12.1km/h).
The calmest month (with the lowest average wind speed) is August (8.2km/h).
Average humidity in December
Iwamizawa, Japan
- Average humidity in December: 88%
The month with the highest relative humidity is January (91%).
The month with the lowest relative humidity is May (77%).
Average rainfall in December
Iwamizawa, Japan
- Average rainfall in December: 73mm
The wettest month (with the highest rainfall) is August (118mm).
The driest months (with the least rainfall) are February and April (44mm).
Average rainfall days in December
Iwamizawa, Japan
- Average rainfall days in December: 8.7 days
The month with the highest number of rainy days is July (19.8 days).
The month with the least rainy days is February (5.1 days).
Average snowfall in December
Iwamizawa, Japan
- Average snowfall in December: 394mm
The month with the highest snowfall is December (394mm).
The months with the least snowfall are June, July, August and September (0mm).
Average snowfall days in December
Iwamizawa, Japan
- Average snowfall days in December: 25.1 days
The month with the highest number of snowfall days is January (25.8 days).
The months with the least snowfall days are June, July, August and September (0 days).
Average daylight in December /
Average sunshine in December
Iwamizawa, Japan
- Average daylight in December: 9h and 1min
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 4min
The month with the most sunshine is May (Average sunshine: 8h and 48min).
The month with the least sunshine is January (Average sunshine: 2h and 24min).
Average sunshine days in December
Iwamizawa, Japan
- Average sunshine days in December: 3 days
The month with the most sunshine days is May (13.8 days).
The month with the least sunshine days is December (3 days).
Average UV index in December
Iwamizawa, 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).
Average cloud cover in December
Iwamizawa, Japan
- Average cloud cover in December: 73
The month with the most cloud cover is January (Cloud cover 77).
The month with the least cloud cover is September (Cloud cover 41).
Average visibility in December
Iwamizawa, Japan
- Average visibility in December: 7km
The months with the highest visibility are April, May and October (9km).
The month with the lowest visibility is January (6km).
Iwamizawa, Japan
Weather forecast for your location
2. Allow the app to use your location
