January weather forecast
Iyo, Japan

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Weather in January

January, the same as December, in Iyo, Japan, is a frosty winter month, with temperature in the range of an average high of 8°C (46.4°F) and an average low of 2.9°C (37.2°F).

Temperature

The month of January, characterized by an average high of 8°C (46.4°F) and a low of 2.9°C (37.2°F), is recognized as the coldest.

Humidity

January through March, with an average relative humidity of 72%, are the least humid months in Iyo.

Rainfall

January is the month with the least rainfall in Iyo. Rain falls for 8.3 days and accumulates 24mm (0.94") of precipitation.

Snowfall

January, February and December are months with snowfall in Iyo, Japan. In Iyo, during January, snow falls for 1.3 days and regularly aggregates up to 4mm (0.16") of snow. Throughout the year, in Iyo, Japan, there are 3.4 snowfall days, and 13mm (0.51") of snow is accumulated.

Sea temperature

In January, the average sea temperature is 15.8°C (60.4°F).
Note: Swimming in 15.8°C (60.4°F) is not a pleasurable activity for the majority of people. Breathing becomes increasingly challenging as water temperature descends from 21°C (69.8°F) to 15°C (59°F).

Daylight

The average length of the day in January in Iyo is 10h and 12min.
On the first day of January, sunrise is at 07:13 and sunset at 17:10. On the last day of the month, sunrise is at 07:06 and sunset at 17:38 JST.

Sunshine

January has the least sunshine of the year in Iyo, with an average of 5.2h of sunshine.

UV index

January and December, with an average maximum UV index of 2, are months with the lowest UV index. A UV Index of 2, and less, symbolizes a minimal health hazard from unsafe exposure to UV radiation for the ordinary person.
Note: The maximum UV index of 2 during January leads to these instructions:
Extended sunlight exposure does not pose significant problems for most people, except for children, infants, and people with fair skin who always need shielding. The Sun's radiation is especially intense around midday; try to stay in shade during this period. Sun-protective clothing, a long-sleeved shirt and pants, a wide-brimmed hat, and UVA and UVB-blocking sunglasses are particularly helpful in blocking UV radiation's harmful effects. Mind you! Snow reflection can increase the intensity of the Sun's UV radiation nearly twofold.
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Frequently asked questions

What part of the year is the coldest in Iyo?

January brings the lowest temperatures in Iyo, with an average high of 8°C (46.4°F) and an average low of 2.9°C (37.2°F).

What is the average January temperature in Iyo?

An average high-temperature, in January, in Iyo, is 8°C (46.4°F) and the average low-temperature is 2.9°C (37.2°F).

What is the least humid month in Iyo?

The months with the lowest humidity are January through March, with an average relative humidity of 72%.

What is the average humidity in January in Iyo?

In January, the average relative humidity in Iyo is 72%.

What is the driest month in Iyo?

The month with the least rainfall in Iyo is January, when the rain falls for 8.3 days and typically collects 24mm (0.94") of precipitation.

How much does it rain in Iyo in January?

In January, in Iyo, the rain falls for 8.3 days. Throughout January, 24mm (0.94") of precipitation is accumulated.

How much does it snow in Iyo in January?

In January, in Iyo, Japan, it is snowing for 1.3 days. Throughout January, 4mm (0.16") of snow is accumulated.

What is the sea temperature in January in Iyo?

In Iyo, Japan, in January, the average water temperature is 15.8°C (60.4°F). For most, swimming in 15.8°C (60.4°F) is not an enjoyable activity. Furthermore, controlling your breathing becomes progressively more difficult as the water temperature decreases from 21°C (69.8°F) to 15°C (59°F).

What is the average length of the day in January in Iyo?

In Iyo, the average day length in January is 10h and 12min.

When are sunrise and sunset in January in Iyo?

On the first day of January in Iyo, Japan, sunrise is at 07:13 and sunset at 17:10. On the last day of the month, sunrise is at 07:06 and sunset at 17:38 JST.

What is the month with the least sunshine in Iyo?

The month with the least sunshine in Iyo is January, with an average of 5.2h of sunshine.

How long on average sun shines in January in Iyo?

The average sunshine duration in January is 5.2h.

When is the lowest UV index in Iyo?

The months with the lowest UV index are January and December, with an average maximum UV index of 2.

What is the UV index reading in January in Iyo?

The average daily maximum UV index in January in Iyo, Japan, is 2. A UV Index of 2, and less, symbolizes a low health risk from exposure to the Sun's UV radiation.
Average humidity
Average rainfall days
Average snowfall days
Average daylight
Average sunshine
Average sunshine days
Average UV index
Average cloud cover

Average temperature in January
Iyo, Japan

Average temperature in January - Iyo, Japan
  • Average high temperature in January: 8°C

The warmest month (with the highest average high temperature) is August (29.2°C).
The month with the lowest average high temperature is January (8°C).

  • Average low temperature in January: 2.9°C

The month with the highest average low temperature is August (23.4°C).
The coldest month (with the lowest average low temperature) is January (2.9°C).

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Average pressure in January
Iyo, Japan

Average pressure in January - Iyo, Japan
  • Average pressure in January: 1021mbar

The month with the highest atmospheric pressure is January (1021mbar).
The month with the lowest atmospheric pressure is June (1008.4mbar).

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Average wind speed in January
Iyo, Japan

Average wind speed in January - Iyo, Japan
  • Average wind speed in January: 12.2km/h

The windiest month (with the highest average wind speed) is January (12.2km/h).
The calmest month (with the lowest average wind speed) is June (6.6km/h).

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Average humidity in January
Iyo, Japan

Average humidity in January - Iyo, Japan
  • Average humidity in January: 72%

The month with the highest relative humidity is July (84%).
The months with the lowest relative humidity are January, February and March (72%).

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Average rainfall in January
Iyo, Japan

Average rainfall in January - Iyo, Japan
  • Average rainfall in January: 24mm

The wettest month (with the highest rainfall) is June (149mm).
The driest month (with the least rainfall) is January (24mm).

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Average rainfall days in January
Iyo, Japan

Average rainfall days in January - Iyo, Japan
  • Average rainfall days in January: 8.3 days

The month with the highest number of rainy days is July (21.3 days).
The month with the least rainy days is January (8.3 days).

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Average snowfall in January
Iyo, Japan

Average snowfall in January - Iyo, Japan
  • Average snowfall in January: 4mm

The month with the highest snowfall is December (6mm).
The months with the least snowfall are March, April, May, June, July, August, September, October and November (0mm).

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Average snowfall days in January
Iyo, Japan

Average snowfall days in January - Iyo, Japan
  • Average snowfall days in January: 1.3 days

The month with the highest number of snowfall days is January (1.3 days).
The months with the least snowfall days are April, May, June, July, August, September, October and November (0 days).

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Average sea temperature in January
Iyo, Japan

Average sea temperature in January - Iyo, Japan
  • Average sea temperature in January: 15.8°C

The best month for swimming (with the highest average sea temperature) is August (27.2°C).
The coldest month (with the lowest average sea temperature) is February (14.7°C).

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Average daylight in January /
Average sunshine in January
Iyo, Japan

Average daylight in January / Average sunshine in January - Iyo, Japan
  • Average daylight in January: 10h and 1min

The month with the longest days is June (Average daylight: 14h and 24min).
The month with the shortest days is December (Average daylight: 10h and 0min).

  • Average sunshine in January: 5h and 1min

The month with the most sunshine is August (Average sunshine: 10h and 48min).
The month with the least sunshine is January (Average sunshine: 5h and 12min).

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Average sunshine days in January
Iyo, Japan

Average sunshine days in January - Iyo, Japan
  • Average sunshine days in January: 20.3 days

The month with the most sunshine days is January (20.3 days).
The month with the least sunshine days is August (6.4 days).

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Average UV index in January
Iyo, Japan

Average UV index in January - Iyo, Japan
  • Average UV index in January: 2

The month with the highest UV index is July (UV index 7).
The months with the lowest UV index are January and December (UV index 2).

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Average cloud cover in January
Iyo, Japan

Average cloud cover in January - Iyo, Japan
  • Average cloud cover in January: 43

The month with the most cloud cover is January (Cloud cover 43).
The month with the least cloud cover is August (Cloud cover 30).

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Average visibility in January
Iyo, Japan

Average visibility in January - Iyo, Japan
  • Average visibility in January: 10km

The months with the highest visibility are January, February, March, August, September, October, November and December (10km).
The months with the lowest visibility are April, May, June and July (9km).

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Iyo, Japan

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