December weather forecast and climate
Hana, HI

Weather in December

The first month of the winter, December, is still a warm month in Hana, Hawaii, with average temperature fluctuating between 72°F (22.2°C) and 74.5°F (23.6°C).

Temperature

In December, the average high-temperature is relatively the same as in November - a still moderately hot 74.5°F (23.6°C). In December, the average low-temperature is 72°F (22.2°C).

Humidity

In Hana, the average relative humidity in December is 77%.

Rainfall

In Hana, it is raining for 13.8 days, with typically 1.5" (38mm) of accumulated precipitation. Throughout the year, there are 136.7 rainfall days, and 13.94" (354mm) of precipitation is accumulated.

Snowfall

In Hana, Hawaii, snow does not fall in January through August, October through December.

Ocean temperature

In Hana, in December, the average water temperature is 76.6°F (24.8°C).
Note: A person's cold intolerance, with sunshine, wind, and air temperature, are essential factors for enjoying swimming in 76.6°F (24.8°C) water. (FYI: The Olympic swimming competition requires a water temperature between 77°F (25°C) and 82.4°F (28°C).)

Daylight

December has the shortest days of the year, with an average of 10.9h of daylight.

Sunshine

December has the least sunshine of the year in Hana, with an average of 6.7h of sunshine.

UV index

January through August, October through December, with an average maximum UV index of 6, are months with the lowest UV index in Hana. A UV Index of 6 to 7 symbolizes a high health hazard from unprotected exposure to the Sun's UV rays for the average person.
Note: The average daily UV index of 6 in December transform into the following instructions:
Take precautions and utilize sun safety practices. Protection against the skin and eye damage is required. Seek shade and minimize exposure to direct Sun in a period between 10 a.m. and 4 p.m. when UV radiation is most intense; keep in mind that shade structures like parasols or canopies do not provide perfect sun protection. 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. Beware! The strength of the UV rays is significantly increased by the reflection of the water and sand.
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FAQ

What is the average humidity in December in Hana?

The average relative humidity in December in Hana is 77%.

How many days does it rain in December in Hana?

In December, in Hana, the rain falls for 13.8 days. Throughout December, 1.5" (38mm) of precipitation is accumulated.

When it does not snow in Hana?

January through August, October through December are months without snowfall in Hana, Hawaii.

What is the water temperature in December in Hana?

In Hana, the average seawater temperature in December is 76.6°F (24.8°C). For individuals prone to feeling cold, swimming in 73.4°F (23°C) is still regarded as intolerable. A wetsuit is not a necessity, but sunshine, wind, and air temperature are essential factors for relishing swimming at 76.6°F (24.8°C).

What is the month with the shortest days in Hana?

The month with the shortest days in Hana is December, with an average of 10.9h of daylight.

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

In December, the average length of the day is 10.9h.

What is the month with the least sunshine in Hana?

December has the least sunshine of the year in Hana, with an average of 6.7h of sunshine.

How long on average sun shines in December in Hana?

In December, the average sunshine in Hana, Hawaii, is 6.7h.

When is the lowest UV index in Hana?

January through August, October through December, with an average maximum UV index of 6, are months with the lowest UV index.

How high is the UV index in December in Hana?

In December, the average daily maximum UV index in Hana is 6. A UV Index value of 6 to 7 symbolizes a high hazard to health from the exposure to the Sun's UV radiation.

Average temperature in December
Hana, HI

Average temperature in December - Hana, HI
  • Average high temperature in December: 23.6°C

The warmest month (with the highest average high temperature) is September (26.1°C).
The month with the lowest average high temperature is March (22.7°C).

  • Average low temperature in December: 22.2°C

The month with the highest average low temperature is September (24.5°C).
The coldest month (with the lowest average low temperature) is March (21°C).

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Average pressure in December
Hana, HI

Average pressure in December - Hana, HI
  • Average pressure in December: 1015.8mbar

The month with the highest atmospheric pressure is April (1017.8mbar).
The month with the lowest atmospheric pressure is October (1014.9mbar).

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Average wind speed in December
Hana, HI

Average wind speed in December - Hana, HI
  • Average wind speed in December: 19.9km/h

The windiest month (with the highest average wind speed) is June (23.2km/h).
The calmest month (with the lowest average wind speed) is January (17.6km/h).

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Average humidity in December
Hana, HI

Average humidity in December - Hana, HI
  • Average humidity in December: 77%

Months with the highest relative humidity are July and August (78%).
Months with the lowest relative humidity are January and February (76%).

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Average rainfall in December
Hana, HI

Average rainfall in December - Hana, HI
  • Average rainfall in December: 38mm

The wettest month (with the highest rainfall) is October (55mm).
The driest month (with the least rainfall) is September (11mm).

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Average rainfall days in December
Hana, HI

Average rainfall days in December - Hana, HI
  • Average rainfall days in December: 13.8 days

The month with the highest number of rainy days is March (14.1 days).
The month with the least rainy days is September (8.1 days).

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Average snowfall days in December
Hana, HI

Average snowfall days in December - Hana, HI
  • Average snowfall days in December: 0 days

The month with the highest number of snowfall days is September (0.1 days).
Months with the least snowfall days are January, February, March, April, May, June, July, August, October, November and December (0 days).

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Average sea temperature in December
Hana, HI

Average sea temperature in December - Hana, HI
  • Average sea temperature in December: 24.8°C

The best month for swimming (with the highest average sea temperature) is September (26.3°C).
The coldest month (with the lowest average sea temperature) is March (24.1°C).

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Average daylight in December /
Average sunshine in December
Hana, HI

Average daylight in December / Average sunshine in December - Hana, HI
  • Average daylight in December: 10.9h

The month with the longest days is June (Average daylight: 13.4h).
The month with the shortest days is December (Average daylight: 10.9h).

  • Average sunshine in December: 6.7h

Months with the most sunshine are June and July (Average sunshine: 11.3h).
The month with the least sunshine is December (Average sunshine: 6.7h).

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Average sunshine days in December
Hana, HI

Average sunshine days in December - Hana, HI
  • Average sunshine days in December: 13.3 days

The month with the most sunshine days is January (16.8 days).
The month with the least sunshine days is November (11.2 days).

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Average UV index in December
Hana, HI

Average UV index in December - Hana, HI
  • Average UV index in December: 6

The month with the highest UV index is September (UV index 7).
Months with the lowest UV index are January, February, March, April, May, June, July, August, October, November and December (UV index 6).

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Average cloud cover in December
Hana, HI

Average cloud cover in December - Hana, HI
  • Average cloud cover in December: 29

The month with the most cloud cover is March (Cloud cover 33).
The month with the least cloud cover is September (Cloud cover 23).

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Average visibility in December
Hana, HI

Average visibility in December - Hana, HI
  • Average visibility in December: 10km

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

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