Contents
- Weather in January
- Frequently asked questions
- Average temperature in January
- Average pressure in January
- Average wind speed in January
- Average humidity in January
- Average rainfall in January
- Average rainfall days in January
- Average snowfall in January
- Average snowfall days in January
- Average daylight in January
- Average sunshine in January
- Average sunshine days in January
- Average UV index in January
- Average cloud cover in January
- Average visibility in January
January
Weather in January
Temperature
January is the month that records the lowest temperatures, with averages ranging from a high of -3.8°C (25.2°F) to a low of -8.3°C (17.1°F).Humidity
January and February, with an average relative humidity of 89%, are the most humid months.Rainfall
In Iwanai, in January, it is raining for 3.4 days, with typically 70mm (2.76") of accumulated precipitation. Throughout the year, there are 157.1 rainfall days, and 887mm (34.92") of precipitation is accumulated.Snowfall
January through May, October through December are months with snowfall. In Iwanai, in January, snow falls for 28.3 days, with typically accumulated 493mm (19.41") of snow. In Iwanai, Japan, during the entire year, snow falls for 120.8 days and aggregates up to 2288mm (90.08") of snow.Daylight
In January, the average length of the day is 9h and 26min.On the first day of January, sunrise is at 07:09 and sunset at 16:13. On the last day of the month, sunrise is at 06:54 and sunset at 16:47 JST.
Sunshine
January has the least sunshine of the year, with an average of 1.4h of sunshine.UV index
January through March, November and December, with an average maximum UV index of 1, are months with the lowest UV index. A UV Index reading of 2, and below, represents a minimal health hazard from exposure to the Sun's UV radiation for average individuals.Note: In January, a daily maximum UV index of 1 leads to the following instructions:
Infants, children, and people with sensitive skin should always have protection against lengthy periods of sun exposure. Midday is when the Sun's radiation is strongest; avoid prolonged exposure during this time. Combat UV radiation's detrimental effects with sun-safe clothing and UV-blocking eyewear. 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
What time of the year is the coldest?
How cold is January?
What are the most humid months?
What is the average humidity in January?
How much does it rain in January?
How much does it snow in January?
How many hours of daylight does Iwanai have in January?
What time are sunrise and sunset in January?
What is the month with the least sunshine?
How long on average sun shines in January?
What is the month with the lowest UV index?
How high is the UV index in January?
Average temperature in January
Iwanai, Japan
- Average high temperature in January: -3.8°C
The warmest month (with the highest average high temperature) is August (23.3°C).
The month with the lowest average high temperature is January (-3.8°C).
- Average low temperature in January: -8.3°C
The month with the highest average low temperature is August (16.1°C).
The coldest month (with the lowest average low temperature) is February (-8.9°C).
Average pressure in January
Iwanai, Japan
- Average pressure in January: 1013.7mbar
The month with the highest atmospheric pressure is November (1016.4mbar).
The month with the lowest atmospheric pressure is July (1008.4mbar).
Average wind speed in January
Iwanai, Japan
- Average wind speed in January: 14.1km/h
The windiest month (with the highest average wind speed) is December (14.5km/h).
The calmest month (with the lowest average wind speed) is August (8km/h).
Average humidity in January
Iwanai, Japan
- Average humidity in January: 89%
The months with the highest relative humidity are January and February (89%).
The month with the lowest relative humidity is April (79%).
Average rainfall in January
Iwanai, Japan
- Average rainfall in January: 70mm
The wettest month (with the highest rainfall) is August (105mm).
The driest month (with the least rainfall) is April (52mm).
Average rainfall days in January
Iwanai, Japan
- Average rainfall days in January: 3.4 days
The month with the highest number of rainy days is August (19.1 days).
The month with the least rainy days is January (3.4 days).
Average snowfall in January
Iwanai, Japan
- Average snowfall in January: 493mm
The month with the highest snowfall is December (598mm).
The months with the least snowfall are June, July, August and September (0mm).
Average snowfall days in January
Iwanai, Japan
- Average snowfall days in January: 28.3 days
The month with the highest number of snowfall days is January (28.3 days).
The months with the least snowfall days are June, July, August and September (0 days).
Average daylight in January /
Average sunshine in January
Iwanai, Japan
- Average daylight in January: 9h and 2min
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 January: 1h and 2min
The months with the most sunshine are May and August (Average sunshine: 8h and 24min).
The month with the least sunshine is January (Average sunshine: 1h and 24min).
Average sunshine days in January
Iwanai, Japan
- Average sunshine days in January: 2.7 days
The month with the most sunshine days is May (13.3 days).
The month with the least sunshine days is January (2.7 days).
Average UV index in January
Iwanai, Japan
- Average UV index in January: 1
The months with the highest UV index are July and August (UV index 5).
The months with the lowest UV index are January, February, March, November and December (UV index 1).
Average cloud cover in January
Iwanai, Japan
- Average cloud cover in January: 86
The month with the most cloud cover is January (Cloud cover 86).
The month with the least cloud cover is September (Cloud cover 43).
Average visibility in January
Iwanai, Japan
- Average visibility in January: 7km
The months with the highest visibility are April, May and October (9km).
The months with the lowest visibility are January, February, July, August and December (7km).
