December weather forecastEwa, HI
December
Weather in December
The first month of the winter, December, is still a warm month in Ewa, Hawaii, with an average temperature fluctuating between 76.6°F (24.8°C) and 71.8°F (22.1°C).Temperature
Upon the onset of December, Ewa witnesses an average high-temperature of a still moderately hot 76.6°F (24.8°C), showing a close resemblance to the prior month. Ewa reports an average low-temperature of 71.8°F (22.1°C) during the subtly cooler December nights.Humidity
December is the most humid month in Ewa, with an average relative humidity of 76%.Rainfall
In Ewa, in December, it is raining for 14.5 days, with typically 1.38" (35mm) of accumulated precipitation. Throughout the year, there are 172.2 rainfall days, and 12.72" (323mm) of precipitation is accumulated.Daylight
December has the shortest days of the year, with an average of 10h and 54min of daylight.On the first day of December, sunrise is at 6:53 am and sunset at 5:49 pm. On the last day of the month, sunrise is at 7:09 am and sunset at 6:01 pm HST.
Sunshine
The average sunshine in December is 6.8h.UV index
The months with the lowest UV index are January through May, October through December, with an average maximum UV index of 6. A UV Index reading of 6 to 7 represents a high health risk from unprotected exposure to Sun's UV rays for the ordinary person.Note: A daily high UV index of 6 in December leads to these guidelines:
Embrace precautions and observe sun safety norms. Evasion of sunburn is a necessity. Seek shade and limit direct Sun exposure between 10 a.m. and 4 p.m., when UV radiation is at its peak, but be aware that not all shade structures provide complete sun protection. Select sunglasses that boast both UVA and UVB protection to limit the adverse effects of the sun on the eyes.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in December
Ewa, HI
- Average high temperature in December: 76.6°F
The warmest months (with the highest average high temperature) are August and September (81.5°F).
The month with the lowest average high temperature is February (74.8°F).
- Average low temperature in December: 71.8°F
The months with the highest average low temperature are August and September (76.3°F).
The coldest month (with the lowest average low temperature) is February (69.4°F).
Average pressure in December
Ewa, HI
- Average pressure in December: 29.99"Hg
The months with the highest atmospheric pressure are March and April (30.05"Hg).
The months with the lowest atmospheric pressure are September and October (29.97"Hg).
Average wind speed in December
Ewa, HI
- Average wind speed in December: 10mph
The windiest month (with the highest average wind speed) is July (11.9mph).
The calmest months (with the lowest average wind speed) are January and October (9.1mph).
Average humidity in December
Ewa, 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%).
Average rainfall in December
Ewa, HI
- Average rainfall in December: 1.38"
The wettest month (with the highest rainfall) is March (1.77").
The driest month (with the least rainfall) is July (0.43").
Average rainfall days in December
Ewa, HI
- Average rainfall days in December: 14.5 days
The month with the highest number of rainy days is March (18.1 days).
The month with the least rainy days is July (11.3 days).
Average daylight in December /
Average sunshine in December
Ewa, HI
- Average daylight in December: 10h and 54min
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 48min
The month with the most sunshine is June (Average sunshine: 11h and 0min).
The month with the least sunshine is November (Average sunshine: 6h and 42min).
Average sunshine days in December
Ewa, HI
- Average sunshine days in December: 10.5 days
The months with the most sunshine days are July and August (15.3 days).
The month with the least sunshine days is March (6.8 days).
Average UV index in December
Ewa, 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).
Average cloud cover in December
Ewa, HI
- Average cloud cover in December: 33
The month with the most cloud cover is March (Cloud cover 37).
The month with the least cloud cover is September (Cloud cover 30).
Average visibility in December
Ewa, 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).
