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
Harper experiences its lowest temperatures in December, with an average peak of 34.3°F (1.3°C) and a low of 22.1°F (-5.5°C).Humidity
In December, the average relative humidity in Harper, Oregon, is 79%.Rainfall
In Harper, during December, the rain falls for 5.2 days and regularly aggregates up to 0.35" (9mm) of 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 in Harper are January through April, November and December. The month with the most snowfall is December, when snow falls for 6.1 days and typically aggregates up to 1.77" (45mm) of snow.Daylight
December has the shortest days of the year, with an average of 9h and 0min of daylight.On the first day of the month, sunrise is at 8:05 am and sunset at 5:14 pm. On the last day of December, in Harper, 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
The months with the lowest UV index are January, February, November and December, with an average maximum UV index of 2. A UV Index of 2, and less, symbolizes a minimal health vulnerability from exposure to the Sun's UV radiation for the average person.Note: In December, the maximum UV index of 2 suggests these recommendations:
Extended exposure to the sun should always be avoided by children, infants, and those with sensitive skin. Direct Sun exposure should be minimized especially during midday when radiation is most intense. Experience reduced UV exposure by about half when donning a wide-brim hat. Be on the lookout! Nearly twofold UV radiation from the Sun can be reflected by snow.
Frequently asked questions
What are the coldest months in Harper?
How cold is December in Harper?
What is the average humidity in December in Harper?
How much does it rain in Harper in December?
When does it snow the most in Harper?
How many days does it snow in December in Harper?
What is the month with the shortest days in Harper?
How many hours of daylight does Harper have in December?
When is the sunrise / sunset in December in Harper?
What is the month with the least sunshine in Harper?
How long on average sun shines in December in Harper?
When is the lowest UV index in Harper?
What is the UV index intensity in December in Harper?
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
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