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 snowfall in December
- Average snowfall days 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
Helix's December weather, marked by an average high temperature of 38.3°F (3.5°C) and an average low temperature of 27.9°F (-2.3°C), is the coldest in the year.Humidity
The average relative humidity in December is 78%.Rainfall
December is the month with the most rainfall. Rain falls for 13.3 days and accumulates 1.5" (38mm) of precipitation.Snowfall
Months with snowfall are January through April, September, November and December. In Helix, in December, snow falls for 6.1 days, with typically accumulated 2.76" (70mm) of snow. Throughout the year, there are 19.8 snowfall days, and 10.16" (258mm) of snow is accumulated.Daylight
December has the shortest days of the year in Helix, with an average of 8h and 42min of daylight.On the first day of the month, sunrise is at 7:16 am and sunset at 4:11 pm. On the last day of December, in Helix, sunrise is at 7:35 am and sunset at 4:20 pm PST.
Sunshine
January and December, with an average of 5.4h of sunshine, are months with the least sunshine.UV index
January, February, November and December, with an average maximum UV index of 2, are months with the lowest UV index. A UV Index estimate of 2, and below, represents a minimal health vulnerability from unprotected exposure to Sun's UV rays for the ordinary person.Note: The daily high UV index of 2 during December translates into the following recommendations:
Prolonged exposure to sunlight rarely troubles the majority, but constant protection is vital for babies, children, and fair-skinned people. Avoiding the Sun during its peak radiation time around midday is a healthy practice. Stay sun-safe with clothing that is both closely woven and worn loosely. Be advised! The UV radiation from the Sun can be almost doubled due to the reflective properties of snow.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
What time of the year is the coldest?
How cold is December?
What is the average humidity in December?
What is the rainiest month?
How much does it rain in December?
How many days does it snow in December?
What is the month with the shortest days?
How many hours of daylight does Helix have in December?
When are sunrise and sunset in December?
What are the months with the least sunshine?
How long on average sun shines in December?
What is the month with the lowest UV index?
What is the UV index reading in December?
Average temperature in December
Helix, OR
- Average high temperature in December: 38.3°F
The warmest month (with the highest average high temperature) is July (86.5°F).
The month with the lowest average high temperature is December (38.3°F).
- Average low temperature in December: 27.9°F
The month with the highest average low temperature is August (63.1°F).
The coldest month (with the lowest average low temperature) is December (27.9°F).
Average pressure in December
Helix, OR
- Average pressure in December: 30.17"Hg
The month with the highest atmospheric pressure is January (30.19"Hg).
The month with the lowest atmospheric pressure is August (29.91"Hg).
Average wind speed in December
Helix, OR
- Average wind speed in December: 6.2mph
The windiest month (with the highest average wind speed) is April (8.5mph).
The calmest month (with the lowest average wind speed) is December (6.2mph).
Average humidity in December
Helix, OR
- Average humidity in December: 78%
The month with the highest relative humidity is January (79%).
The months with the lowest relative humidity are July and August (37%).
Average rainfall in December
Helix, OR
- Average rainfall in December: 1.5"
The wettest month (with the highest rainfall) is December (1.5").
The driest month (with the least rainfall) is July (0.2").
Average rainfall days in December
Helix, OR
- Average rainfall days in December: 13.3 days
The month with the highest number of rainy days is March (15.9 days).
The month with the least rainy days is August (3.7 days).
Average snowfall in December
Helix, OR
- Average snowfall in December: 2.76"
The month with the highest snowfall is February (3.74").
The months with the least snowfall are May, June, July, August and October (0").
Average snowfall days in December
Helix, OR
- Average snowfall days in December: 6.1 days
The month with the highest number of snowfall days is December (6.1 days).
The months with the least snowfall days are May, June, July, August and October (0 days).
Average daylight in December /
Average sunshine in December
Helix, OR
- Average daylight in December: 8h and 4min
The month with the longest days is June (Average daylight: 15h and 42min).
The month with the shortest days is December (Average daylight: 8h and 42min).
- Average sunshine in December: 5h and 2min
The month with the most sunshine is August (Average sunshine: 12h and 6min).
The months with the least sunshine are January and December (Average sunshine: 5h and 24min).
Average sunshine days in December
Helix, OR
- Average sunshine days in December: 13.8 days
The month with the most sunshine days is July (25.1 days).
The month with the least sunshine days is February (12.4 days).
Average UV index in December
Helix, OR
- Average UV index in December: 2
The month with the highest UV index is July (UV index 7).
The months with the lowest UV index are January, February, November and December (UV index 2).
Average cloud cover in December
Helix, OR
- Average cloud cover in December: 44
The month with the most cloud cover is December (Cloud cover 44).
The months with the least cloud cover are July and August (Cloud cover 9).
Average visibility in December
Helix, OR
- 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).
Helix, Oregon, USA
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