Iyo
Japan
Long-term weather forecast
Long-term weather forecast

December weather forecast and climate
Iyo, Japan

Sea temperature

In December, the average sea temperature in Iyo, Japan, is 18.3°C (64.9°F).
Note: For most, swimming in 18.3°C (64.9°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).

Daylight

The month with the shortest days is December, with an average of 9.9h of daylight.

How cold is the water in December in Iyo?

In December, the average sea temperature in Iyo is 18.3°C (64.9°F). Swimming in 18.3°C (64.9°F) is not enjoyable for the majority. Controlling breathing becomes progressively more difficult as surface water temperature decreases below 21°C (69.8°F).

What is the month with the shortest days in Iyo?

The month with the shortest days in Iyo is December, with an average of 9.9h of daylight.

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

The average length of the day in December in Iyo is 9.9h.
Average sea temperature in December - Iyo, Japan
  • Average sea temperature in December: 18.3°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).

Average daylight in December - Iyo, Japan
  • Average daylight in December: 9.9h

The month with the longest days is June (Average daylight: 14.4h).
The month with shortest days is December (Average daylight: 9.9h).