Contents
- Weather in December
- Frequently asked questions
- Average temperature in December
- Average pressure in December
- Average wind speed in December
- Average humidity in December
- Average rainfall in December
- Average rainfall days in December
- Average sea temperature in December
- Average daylight in December
- Average sunshine in December
- Average sunshine days in December
- Average UV index in December
- Average cloud cover in December
- Average visibility in December
Weather in December
Temperature
December commences with an average high-temperature of a still warm 76.6°F (24.8°C), showing little deviation from November's 78.8°F (26°C). Haleiwa's evenings during December maintain an average temperature of 71.2°F (21.8°C), aligning closely with the daytime temperatures.Humidity
February and December, with an average relative humidity of 76%, are the most humid months.Rainfall
In Haleiwa, during December, the rain falls for 14.5 days and regularly aggregates up to 1.06" (27mm) of precipitation. Throughout the year, there are 190.2 rainfall days, and 11.65" (296mm) of precipitation is accumulated.Ocean temperature
In Haleiwa, the average seawater temperature in December is 76.6°F (24.8°C).Note: If cold is not your friend, swimming at 76.6°F (24.8°C) might be daunting. But the right mix of sunshine, wind, and external temperature can make a difference. Although wetsuits are not essential, they can enhance the swimming experience.
Daylight
With an average of 10h and 48min of daylight, December has the shortest days of the year.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.
Sunshine
The average sunshine in December in Haleiwa is 6.3h.UV index
January through June, August, October through December, with an average maximum UV index of 6, are months with the lowest UV index in Haleiwa. A UV Index reading of 6 to 7 represents a high threat to health from unsafe exposure to UV radiation for average individuals.Note: In December, a regular UV index of 6 translates into these guidelines:
Exercise precautions and adapt sun safety practices. Defence against skin and eye affliction is paramount. Avoid direct Sun exposure and stay in the shade between 10 a.m. and 4 p.m., a time when UV radiation is most intense, noting that not all shade structures offer full protection. During bright days, sunglasses that offer UVA and UVB defense are recommended. Take note! Sand and water reflections strengthen the Sun's UV exposure.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
What are December temperatures in Haleiwa?
What are the most humid months in Haleiwa?
What is the average humidity in December in Haleiwa?
How many days does it rain in December in Haleiwa?
What is the water temperature in December in Haleiwa?
What is the month with the shortest days in Haleiwa?
What is the average length of the day in December in Haleiwa?
When is the sunrise / sunset in December in Haleiwa?
How long on average sun shines in December in Haleiwa?
What is the month with the lowest UV index in Haleiwa?
What is the UV index reading in December in Haleiwa?
Average temperature in December
Haleiwa, HI
- Average high temperature in December: 76.6°F
The warmest month (with the highest average high temperature) is September (81.7°F).
The month with the lowest average high temperature is February (75°F).
- Average low temperature in December: 71.2°F
The months with the highest average low temperature are August and September (75.7°F).
The coldest month (with the lowest average low temperature) is February (68.5°F).
Average pressure in December
Haleiwa, HI
- Average pressure in December: 30"Hg
The month with the highest atmospheric pressure is April (30.06"Hg).
The month with the lowest atmospheric pressure is October (29.97"Hg).
Average wind speed in December
Haleiwa, 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 January (9mph).
Average humidity in December
Haleiwa, HI
- Average humidity in December: 76%
The months with the highest relative humidity are February and December (76%).
The months with the lowest relative humidity are May and September (74%).
Average rainfall in December
Haleiwa, HI
- Average rainfall in December: 1.06"
The wettest months (with the highest rainfall) are February and October (1.34").
The driest month (with the least rainfall) is July (0.63").
Average rainfall days in December
Haleiwa, HI
- Average rainfall days in December: 14.5 days
The month with the highest number of rainy days is March (17.7 days).
The month with the least rainy days is January (12.5 days).
Average sea temperature in December
Haleiwa, HI
- Average sea temperature in December: 76.6°F
The best month for swimming (with the highest average sea temperature) is September (80.2°F).
The coldest month (with the lowest average sea temperature) is March (75.2°F).
Average daylight in December /
Average sunshine in December
Haleiwa, 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 48min).
- Average sunshine in December: 6h and 2min
The month with the most sunshine is June (Average sunshine: 9h and 54min).
The month with the least sunshine is November (Average sunshine: 6h and 12min).
Average sunshine days in December
Haleiwa, HI
- Average sunshine days in December: 10.4 days
The month with the most sunshine days is January (12.9 days).
The month with the least sunshine days is September (6.5 days).
Average UV index in December
Haleiwa, HI
- Average UV index in December: 6
The months with the highest UV index are July and September (UV index 7).
The months with the lowest UV index are January, February, March, April, May, June, August, October, November and December (UV index 6).
Average cloud cover in December
Haleiwa, HI
- Average cloud cover in December: 40
The month with the most cloud cover is March (Cloud cover 44).
The months with the least cloud cover are January and September (Cloud cover 37).
Average visibility in December
Haleiwa, 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).
Haleiwa, Hawaii, USA
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