December weather forecast
Nānākuli, HI

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Weather in December

The weather in December in Nānākuli witnesses the staggering transformation from warm to colder months. The transition is gradual yet significant enough to be noticed by every resident. Rolling in with a drop in temperature, the lowest for the year at 71.8°F (22.1°C), December marks the beginning of the decline in temperature. Heading towards the new year, the temperature continues to stay low, providing a fresh and cool backdrop for the year-ending celebrations.

Temperature

December's arrival registers an average high-temperature of a still moderately hot 76.6°F (24.8°C), closely aligning with the temperature of the previous month. Nighttime readings in Nānākuli during December register a minimal drop from daytime highs, averaging at a pleasant 71.8°F (22.1°C).

Humidity

The most humid month is December, with an average relative humidity of 76%.

Rainfall

In Nānākuli, in December, during 15.5 rainfall days, 1.46" (37mm) of precipitation is typically accumulated. Throughout the year, in Nānākuli, there are 196.3 rainfall days, and 14.72" (374mm) of precipitation is accumulated.

Ocean temperature

In Nānākuli, the average seawater temperature in December is 77.4°F (25.2°C).
Note: For water activities like swimming, diving, and more, temperatures ranging between 77°F (25°C) and 84.2°F (29°C) offer superior comfort and enjoyment for lengthy durations.

Daylight

The month with the shortest days is December, with an average of 10h and 54min of daylight.
On the first day of December in Nānākuli, sunrise is at 6:54 am and sunset at 5:49 pm. On the last day of the month, sunrise is at 7:10 am and sunset at 6:01 pm HST.

Sunshine

In December, the average sunshine is 6.7h.

UV index

January through May, October through December, with an average maximum UV index of 6, are months with the lowest UV index in Nānākuli. A UV Index estimate of 6 to 7 represents a high health risk from unprotected exposure to Sun's UV rays for the average person.
Note: The maximum UV index, 6 during December, leads to the following recommendations:
Take precautions against overexposure. Protection against sun damage is needed. Between 10 a.m. and 4 p.m., the Sun emits the most powerful UV radiation. Limit direct exposure to the Sun during these hours. During bright days, sunglasses that offer UVA and UVB defense are recommended. Attention! The reflection of both water and sand can increase the intensity of UV rays.
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Frequently asked questions

What is the average December temperature in Nānākuli?

In December, the average high-temperature and low-temperature are 76.6°F (24.8°C) and 71.8°F (22.1°C) respectively. In October, the average heat index (a.k.a. 'felt air temperature', 'real feel'), which combines air temperature and relative humidity, is evaluated at 86°F (30°C).

What is the most humid month in Nānākuli?

December is the most humid month, with an average relative humidity of 76%.

What is the average humidity in December in Nānākuli?

In December, the average relative humidity in Nānākuli is 76%.

How many days does it rain in December in Nānākuli?

In December, the rain falls for 15.5 days. Throughout December, 1.46" (37mm) of precipitation is accumulated.

What is the water temperature in December in Nānākuli?

In Nānākuli, in December, the average water temperature is 77.4°F (25.2°C). For swimming, diving, and other water activities, temperatures between 77°F (25°C) and 84.2°F (29°C) are perceived as very enjoyable and pleasurable for prolonged periods without feeling uncomfortable.

What is the month with the shortest days in Nānākuli?

With an average of 10h and 54min of daylight, December has the shortest days of the year in Nānākuli, Hawaii.

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

The average day length in December in Nānākuli, Hawaii, is 10h and 52min.

When are sunrise and sunset in December in Nānākuli?

On the first day of December, sunrise is at 6:54 am and sunset at 5:49 pm. On the last day of the month, sunrise is at 7:10 am and sunset at 6:01 pm HST.

How long on average sun shines in December in Nānākuli?

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

What is the month with the lowest UV index in Nānākuli?

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

What is the UV index reading in December in Nānākuli?

In December, the average daily maximum UV index in Nānākuli, Hawaii, is 6. A UV Index value of 6 to 7 symbolizes a high hazard to health from unsafe exposure to Sun's UV rays.
Average humidity
Average rainfall days
Average daylight
Average sunshine
Average sunshine days
Average UV index
Average cloud cover
Average visibility

Average temperature in December
Nānākuli, HI

Average temperature in December - Nānākuli, HI
  • Average high temperature in December: 76.6°F

The warmest months (with the highest average high temperature) are August and September (81.7°F).
The month with the lowest average high temperature is February (75°F).

  • Average low temperature in December: 71.8°F

The months with the highest average low temperature are August and September (75.9°F).
The coldest month (with the lowest average low temperature) is February (69.1°F).

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Average pressure in December
Nānākuli, HI

Average pressure in December - Nānākuli, HI
  • Average pressure in December: 30"Hg

The month with the highest atmospheric pressure is April (30.06"Hg).
The months with the lowest atmospheric pressure are September and October (29.97"Hg).

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Average wind speed in December
Nānākuli, HI

Average wind speed in December - Nānākuli, HI
  • Average wind speed in December: 9.7mph

The windiest month (with the highest average wind speed) is July (11.6mph).
The calmest month (with the lowest average wind speed) is October (8.8mph).

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Average humidity in December
Nānākuli, HI

Average humidity in December - Nānākuli, HI
  • Average humidity in December: 76%

The month with the highest relative humidity is December (76%).
The months with the lowest relative humidity are January, April, May, June, August, September, October and November (74%).

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Average rainfall in December
Nānākuli, HI

Average rainfall in December - Nānākuli, HI
  • Average rainfall in December: 1.46"

The wettest month (with the highest rainfall) is March (1.81").
The driest month (with the least rainfall) is July (0.67").

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Average rainfall days in December
Nānākuli, HI

Average rainfall days in December - Nānākuli, HI
  • Average rainfall days in December: 15.5 days

The month with the highest number of rainy days is September (18.9 days).
The month with the least rainy days is January (13.8 days).

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Average sea temperature in December
Nānākuli, HI

Average sea temperature in December - Nānākuli, HI
  • Average sea temperature in December: 77.3°F

The best month for swimming (with the highest average sea temperature) is September (80.6°F).
The coldest month (with the lowest average sea temperature) is March (75.7°F).

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

Average daylight in December / Average sunshine in December - Nānākuli, HI
  • Average daylight in December: 10h and 5min

The month with the longest days is June (Average daylight: 13h and 24min).
The month with the shortest days is December (Average daylight: 10h and 54min).

  • Average sunshine in December: 6h and 4min

The month with the most sunshine is June (Average sunshine: 10h and 48min).
The month with the least sunshine is November (Average sunshine: 6h and 36min).

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Average sunshine days in December
Nānākuli, HI

Average sunshine days in December - Nānākuli, HI
  • Average sunshine days in December: 8.8 days

The month with the most sunshine days is January (11.8 days).
The month with the least sunshine days is November (6.4 days).

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Average UV index in December
Nānākuli, HI

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

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

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Average cloud cover in December
Nānākuli, HI

Average cloud cover in December - Nānākuli, HI
  • Average cloud cover in December: 34

The month with the most cloud cover is March (Cloud cover 38).
The months with the least cloud cover are January and September (Cloud cover 32).

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Average visibility in December
Nānākuli, HI

Average visibility in December - Nānākuli, HI
  • Average visibility in December: 6mi

The months with the highest visibility are January, February, March, April, May, June, July, August, September, October, November and December (6mi).
The months with the lowest visibility are January, February, March, April, May, June, July, August, September, October, November and December (6mi).

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Nānākuli, Hawaii, USA

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