December weather forecastIwanuma, Japan
December
Weather in December
The first month of the winter, December, is also a frosty month in Iwanuma, Japan, with an average temperature varying between 6.6°C (43.9°F) and 1.9°C (35.4°F).Temperature
December's arrival corresponds with a decrease in average high-temperatures, from November's fresh 12.5°C (54.5°F) to a frosty 6.6°C (43.9°F). Iwanuma encounters a small divergence from daytime high temperatures, averaging a low-temperature of 1.9°C (35.4°F) during December nights.Humidity
In Iwanuma, Japan, the average relative humidity in December is 75%.Rainfall
In Iwanuma, during December, the rain falls for 9.3 days and regularly aggregates up to 28mm (1.1") of precipitation. Throughout the year, in Iwanuma, there are 141.6 rainfall days, and 753mm (29.65") of precipitation is accumulated.Snowfall
Months with snowfall are January through April and December. December is the first month it typically snows in Iwanuma. Throughout December, in the average 3.2 snowfall days, it receives 20mm (0.79") of snow. Throughout the year, in Iwanuma, Japan, there are 19.2 snowfall days, and 203mm (7.99") of snow is accumulated.Daylight
With an average of 9h and 36min of daylight, December has the shortest days of the year.On the first day of the month, sunrise is at 06:34 and sunset at 16:17. On the last day of December, in Iwanuma, sunrise is at 06:52 and sunset at 16:26 JST.
Sunshine
In December, the average sunshine is 5.6h.UV index
January through March and December, with an average maximum UV index of 2, are months with the lowest UV index. A UV Index value of 2, and less, symbolizes a minimal health vulnerability from unprotected exposure to Sun's UV rays for the average person.Note: In December, a daily maximum UV index of 2 leads to the following instructions:
Despite the majority tolerating prolonged sun exposure, those with sensitive skin, infants, and children demand continual protection. The Sun's most intense and consequently most harmful UV radiation during midday hours should be decreased by minimizing exposure and seeking shade. On days when the sun blazes, arm yourself with sunglasses that block UVA and UVB radiation. Be aware! The reflective nature of snow can magnify the Sun's UV radiation almost twofold.
Published by: Weather Atlas | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in December
Iwanuma, Japan
- Average high temperature in December: 6.6°C
The warmest month (with the highest average high temperature) is August (27.6°C).
The month with the lowest average high temperature is January (3.6°C).
- Average low temperature in December: 1.9°C
The month with the highest average low temperature is August (21.5°C).
The coldest month (with the lowest average low temperature) is February (-1.2°C).
Average pressure in December
Iwanuma, Japan
- Average pressure in December: 1016.3mbar
The month with the highest atmospheric pressure is November (1018.7mbar).
The month with the lowest atmospheric pressure is June (1009.3mbar).
Average wind speed in December
Iwanuma, Japan
- Average wind speed in December: 15km/h
The windiest month (with the highest average wind speed) is January (15.4km/h).
The calmest month (with the lowest average wind speed) is July (8.4km/h).
Average humidity in December
Iwanuma, Japan
- Average humidity in December: 75%
The month with the highest relative humidity is July (84%).
The month with the lowest relative humidity is April (72%).
Average rainfall in December
Iwanuma, Japan
- Average rainfall in December: 28mm
The wettest month (with the highest rainfall) is July (118mm).
The driest month (with the least rainfall) is February (22mm).
Average rainfall days in December
Iwanuma, Japan
- Average rainfall days in December: 9.3 days
The month with the highest number of rainy days is July (19.6 days).
The month with the least rainy days is February (6.1 days).
Average snowfall in December
Iwanuma, Japan
- Average snowfall in December: 20mm
The month with the highest snowfall is January (67mm).
The months with the least snowfall are May, June, July, August, September, October and November (0mm).
Average snowfall days in December
Iwanuma, Japan
- Average snowfall days in December: 3.2 days
The month with the highest number of snowfall days is January (7 days).
The months with the least snowfall days are May, June, July, August, September, October and November (0 days).
Average daylight in December /
Average sunshine in December
Iwanuma, Japan
- Average daylight in December: 9h and 36min
The month with the longest days is June (Average daylight: 14h and 48min).
The month with the shortest days is December (Average daylight: 9h and 36min).
- Average sunshine in December: 5h and 36min
The month with the most sunshine is May (Average sunshine: 9h and 36min).
The months with the least sunshine are January and February (Average sunshine: 5h and 6min).
Average sunshine days in December
Iwanuma, Japan
- Average sunshine days in December: 18.3 days
The month with the most sunshine days is November (20.2 days).
The month with the least sunshine days is July (8.6 days).
Average UV index in December
Iwanuma, Japan
- Average UV index in December: 2
The months with the highest UV index are July and August (UV index 6).
The months with the lowest UV index are January, February, March and December (UV index 2).
Average cloud cover in December
Iwanuma, Japan
- Average cloud cover in December: 43
The month with the most cloud cover is July (Cloud cover 48).
The month with the least cloud cover is May (Cloud cover 35).
Average visibility in December
Iwanuma, Japan
- Average visibility in December: 10km
The months with the highest visibility are January, February, March, October, November and December (10km).
The months with the lowest visibility are April, May, June, July, August and September (9km).
