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
December is the coldest month, with the temperature often reaching an average high of 34.3°F (1.3°C) and an average low of 22.1°F (-5.5°C).Humidity
In Harper, the average relative humidity in December is 79%.Rainfall
In Harper, in December, it is raining for 5.2 days, with typically 0.35" (9mm) of accumulated precipitation. In Harper, during the entire year, the rain falls for 57 days and collects up to 2.99" (76mm) of precipitation.Snowfall
Months with snowfall are January through April, November and December. December is the month with the most snowfall. Snow falls for 6.1 days and accumulates 1.77" (45mm) of snow.Daylight
With an average of 9h and 0min of daylight, December has the shortest days of the year.On the first day of December, sunrise is at 8:05 am and sunset at 5:14 pm. On the last day of the month, sunrise is at 8:24 am and sunset at 5:23 pm MST.
Sunshine
The month with the least sunshine is December, with an average of 5.2h of 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 of 2, and less, symbolizes a low threat to health from unsafe exposure to UV radiation for the ordinary person.Note: The maximum UV index of 2 during December leads to these instructions:
It is important to always shield children, babies, and individuals with sensitive skin from prolonged exposure to the sun. Considering the strength of solar radiation at midday, one should avoid direct Sun exposure. For optimum UV protection, wear sun-resistant attire complemented with a hat and quality shades. On your guard! Snow's reflection can almost double the intensity of the Sun's UV radiation.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
What time of the year is the coldest in Harper?
How cold is it in December?
What is the average humidity in December?
How much does it rain in December?
What is the snowiest month?
How many days does it snow in December?
What is the month with the shortest days?
How many hours of daylight does Harper have in December?
What time are sunrise and sunset in December?
What is the month with the least sunshine?
How many hours of sunshine does Harper have in December?
What is the month with the lowest UV index in Harper?
How high is the UV index in December?
Average temperature in December
Harper, OR
- Average high temperature in December: 34.3°F
The warmest month (with the highest average high temperature) is July (91°F).
The month with the lowest average high temperature is December (34.3°F).
- Average low temperature in December: 22.1°F
The month with the highest average low temperature is August (63.5°F).
The coldest months (with the lowest average low temperature) are January and December (22.1°F).
Average pressure in December
Harper, OR
- Average pressure in December: 30.2"Hg
The month with the highest atmospheric pressure is January (30.24"Hg).
The month with the lowest atmospheric pressure is August (29.92"Hg).
Average wind speed in December
Harper, OR
- Average wind speed in December: 4.3mph
The windiest month (with the highest average wind speed) is April (7.1mph).
The calmest month (with the lowest average wind speed) is January (3.9mph).
Average humidity in December
Harper, OR
- Average humidity in December: 79%
The month with the highest relative humidity is January (83%).
The months with the lowest relative humidity are July and August (28%).
Average rainfall in December
Harper, OR
- Average rainfall in December: 0.35"
The wettest months (with the highest rainfall) are March and May (0.39").
The driest months (with the least rainfall) are July and August (0.08").
Average rainfall days in December
Harper, OR
- Average rainfall days in December: 5.2 days
The month with the highest number of rainy days is March (8.4 days).
The month with the least rainy days is August (2.3 days).
Average snowfall in December
Harper, OR
- Average snowfall in December: 1.77"
The month with the highest snowfall is December (1.77").
The months with the least snowfall are May, June, July, August, September and October (0").
Average snowfall days in December
Harper, 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, September and October (0 days).
Average daylight in December /
Average sunshine in December
Harper, OR
- Average daylight in December: 9h and 0min
The month with the longest days is June (Average daylight: 15h and 24min).
The month with the shortest days is December (Average daylight: 9h and 0min).
- Average sunshine in December: 5h and 1min
The month with the most sunshine is July (Average sunshine: 12h and 6min).
The month with the least sunshine is December (Average sunshine: 5h and 12min).
Average sunshine days in December
Harper, OR
- Average sunshine days in December: 21.7 days
The month with the most sunshine days is July (26.8 days).
The month with the least sunshine days is March (20.1 days).
Average UV index in December
Harper, 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
Harper, OR
- Average cloud cover in December: 43
The months with the most cloud cover are January and December (Cloud cover 43).
The months with the least cloud cover are July and August (Cloud cover 8).
Average visibility in December
Harper, OR
- Average visibility in December: 5mi
The months with the highest visibility are March, April, May, June, July, August, September, October and November (6mi).
The months with the lowest visibility are January, February and December (5mi).
Harper, Oregon, USA
Weather forecast for your location
2. Allow the app to use your location