December weather forecastNaalehu, HI
December
Weather in December
As winter sets in, Naalehu, unlike many other regions, escapes any harsh drops in temperature, maintaining the average around 70.5°F (21.4°C). Despite the slight increase in rainfall to 1.3" (33mm), the rest of the weather conditions, including wind speed, daylight hours, and UV Index, largely remain consistent with November. The month provides an impressive display of Hawaiian winter, retaining a balance between sunshine and rain, whilst maintaining a pleasantly cooler environment.Temperature
The arrival of December brings an average high-temperature of a still agreeable 70.5°F (21.4°C), nearly identical to November's 71.8°F (22.1°C). Nights during December maintain a steady temperature, averaging at an enjoyable 66.6°F (19.2°C).Humidity
In Naalehu, the average relative humidity in December is 76%.Rainfall
In December, the rain falls for 15.6 days. Throughout December, 1.3" (33mm) of precipitation is accumulated. In Naalehu, during the entire year, the rain falls for 216.1 days and collects up to 16.57" (421mm) of precipitation.Daylight
The month with the shortest days is December, with an average of 11h and 0min of daylight.On the first day of the month, sunrise is at 6:39 am and sunset at 5:43 pm. On the last day of December, sunrise is at 6:55 am and sunset at 5:55 pm HST.
Sunshine
November and December, with an average of 7.3h of sunshine, are months with the least sunshine.UV index
The months with the lowest UV index are January through April, November and December, with an average maximum UV index of 5. A UV Index reading of 3 to 5 represents a medium vulnerability from unprotected exposure to Sun's UV rays for the ordinary person.Note: A daily high UV index of 5 in December leads to these guidelines:
Act with care - The suggestion to avoid sunburn is emphasized. Direct exposure to the Sun's intense radiation around midday should be avoided for health reasons. Your best bet for sun defense on the face, eyes, and neck is a hat with a wide brim.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in December
Naalehu, HI
- Average high temperature in December: 70.5°F
The warmest months (with the highest average high temperature) are August and October (73.2°F).
The month with the lowest average high temperature is February (68.9°F).
- Average low temperature in December: 66.6°F
The month with the highest average low temperature is October (70°F).
The coldest month (with the lowest average low temperature) is March (64.8°F).
Average pressure in December
Naalehu, HI
- Average pressure in December: 29.98"Hg
The month with the highest atmospheric pressure is April (30.04"Hg).
The months with the lowest atmospheric pressure are September and October (29.96"Hg).
Average wind speed in December
Naalehu, HI
- Average wind speed in December: 5.3mph
The windiest month (with the highest average wind speed) is May (6.3mph).
The calmest month (with the lowest average wind speed) is December (5.3mph).
Average humidity in December
Naalehu, HI
- Average humidity in December: 76%
The months with the highest relative humidity are June, July, August and September (81%).
The month with the lowest relative humidity is February (73%).
Average rainfall in December
Naalehu, HI
- Average rainfall in December: 1.3"
The wettest month (with the highest rainfall) is September (1.81").
The driest month (with the least rainfall) is January (0.75").
Average rainfall days in December
Naalehu, HI
- Average rainfall days in December: 15.6 days
The month with the highest number of rainy days is August (21.8 days).
The month with the least rainy days is January (10.8 days).
Average daylight in December /
Average sunshine in December
Naalehu, HI
- Average daylight in December: 11h and 0min
The month with the longest days is June (Average daylight: 13h and 18min).
The month with the shortest days is December (Average daylight: 11h and 0min).
- Average sunshine in December: 7h and 18min
The month with the most sunshine is May (Average sunshine: 10h and 42min).
The months with the least sunshine are November and December (Average sunshine: 7h and 18min).
Average sunshine days in December
Naalehu, HI
- Average sunshine days in December: 8.3 days
The month with the most sunshine days is January (12.7 days).
The month with the least sunshine days is May (3.2 days).
Average UV index in December
Naalehu, HI
- Average UV index in December: 5
The months with the highest UV index are May, June, July, August, September and October (UV index 6).
The months with the lowest UV index are January, February, March, April, November and December (UV index 5).
Average cloud cover in December
Naalehu, HI
- Average cloud cover in December: 18
The month with the most cloud cover is June (Cloud cover 31).
The month with the least cloud cover is January (Cloud cover 15).
Average visibility in December
Naalehu, 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).
