January weather forecastJoetsu, Japan
January
Weather in January
January, like December, in Joetsu, Japan, is a wintry winter month, with an average temperature ranging between max 2.8°C (37°F) and min -1.6°C (29.1°F).Temperature
January, having an average high-temperature of 2.8°C (37°F) and an average low-temperature of -1.6°C (29.1°F), is the coldest month.Humidity
January is the most humid month, with an average relative humidity of 84%.Rainfall
In Joetsu, in January, during 14.3 rainfall days, 139mm (5.47") of precipitation is typically accumulated. Throughout the year, there are 200.6 rainfall days, and 1190mm (46.85") of precipitation is accumulated.Snowfall
Months with snowfall are January through April, November and December. The month with the most snowfall in Joetsu, Japan, is January, when snow falls for 17.4 days and typically aggregates up to 466mm (18.35") of snow.Sea temperature
In Joetsu, in January, the average water temperature is 12.5°C (54.5°F).Note: Engaging in a swim in 12.5°C (54.5°F) can threaten life. Brief exposure to 13°C (55.4°F) waters is uneasy, and submersion below 10°C (50°F) can lead to cold shock and disrupted breathing patterns, varying by individual.
Daylight
The average length of the day in January in Joetsu is 9h and 56min.On the first day of January, sunrise is at 07:00 and sunset at 16:39. On the last day of the month, sunrise is at 06:51 and sunset at 17:09 JST.
Sunshine
January has the least sunshine of the year, with an average of 2.7h of sunshine.UV index
The months with the lowest UV index are January and December, with an average maximum UV index of 1. A UV Index estimate of 2, and below, represents a minimal health hazard from exposure to the Sun's UV radiation for the ordinary person.Note: The UV index of 1 during January leads to these advisories:
While sun exposure does not greatly affect most, individuals with fair skin, babies, and children always need vigilant safeguarding. Direct Sun exposure should be minimized especially during midday when radiation is most intense. A hat with a broad brim is indispensable, filtering out up to half of UV rays. Take careful note! The UV radiation of the Sun can be nearly doubled by snow reflection.
Published by: Weather Atlas | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in January
Joetsu, Japan
- Average high temperature in January: 2.8°C
The warmest month (with the highest average high temperature) is August (27.8°C).
The month with the lowest average high temperature is January (2.8°C).
- Average low temperature in January: -1.6°C
The month with the highest average low temperature is August (20.9°C).
The coldest month (with the lowest average low temperature) is February (-1.9°C).
Average pressure in January
Joetsu, Japan
- Average pressure in January: 1017.9mbar
The month with the highest atmospheric pressure is November (1019.2mbar).
The month with the lowest atmospheric pressure is June (1009.2mbar).
Average wind speed in January
Joetsu, Japan
- Average wind speed in January: 15.4km/h
The windiest months (with the highest average wind speed) are January and December (15.4km/h).
The calmest months (with the lowest average wind speed) are July and August (7.7km/h).
Average humidity in January
Joetsu, Japan
- Average humidity in January: 84%
The month with the highest relative humidity is January (84%).
The month with the lowest relative humidity is May (74%).
Average rainfall in January
Joetsu, Japan
- Average rainfall in January: 139mm
The wettest month (with the highest rainfall) is July (142mm).
The driest month (with the least rainfall) is May (57mm).
Average rainfall days in January
Joetsu, Japan
- Average rainfall days in January: 14.3 days
The month with the highest number of rainy days is July (21.6 days).
The month with the least rainy days is February (10.3 days).
Average snowfall in January
Joetsu, Japan
- Average snowfall in January: 466mm
The month with the highest snowfall is January (466mm).
The months with the least snowfall are May, June, July, August, September and October (0mm).
Average snowfall days in January
Joetsu, Japan
- Average snowfall days in January: 17.4 days
The month with the highest number of snowfall days is January (17.4 days).
The months with the least snowfall days are May, June, July, August, September and October (0 days).
Average sea temperature in January
Joetsu, Japan
- Average sea temperature in January: 12.5°C
The best month for swimming (with the highest average sea temperature) is August (27°C).
The coldest month (with the lowest average sea temperature) is March (10.3°C).
Average daylight in January /
Average sunshine in January
Joetsu, Japan
- Average daylight in January: 9h and 54min
The month with the longest days is June (Average daylight: 14h and 42min).
The month with the shortest days is December (Average daylight: 9h and 42min).
- Average sunshine in January: 2h and 42min
The month with the most sunshine is August (Average sunshine: 10h and 18min).
The month with the least sunshine is January (Average sunshine: 2h and 42min).
Average sunshine days in January
Joetsu, Japan
- Average sunshine days in January: 4.3 days
The month with the most sunshine days is May (15.1 days).
The month with the least sunshine days is January (4.3 days).
Average UV index in January
Joetsu, Japan
- Average UV index in January: 1
The months with the highest UV index are June, July and August (UV index 6).
The months with the lowest UV index are January and December (UV index 1).
Average cloud cover in January
Joetsu, Japan
- Average cloud cover in January: 74
The month with the most cloud cover is January (Cloud cover 74).
The month with the least cloud cover is May (Cloud cover 35).
Average visibility in January
Joetsu, Japan
- Average visibility in January: 8km
The months with the highest visibility are October and November (10km).
The month with the lowest visibility is January (8km).
