December weather forecast
Richland, OR

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Weather in December

December, the first month of the winter in Richland, is also a subzero cold month, with temperature in the range of an average low of 18.5°F (-7.5°C) and an average high of 30.7°F (-0.7°C).

Temperature

With an average high-temperature of 30.7°F (-0.7°C) and an average low-temperature of 18.5°F (-7.5°C), December is the coldest month.

Humidity

In December, the average relative humidity is 86%.

Rainfall

The month with the most rainfall is December, when the rain falls for 8.6 days and typically aggregates up to 1.77" (45mm) of precipitation.

Snowfall

January through May, October through December are months with snowfall in Richland, Oregon. The month with the most snowfall is December, when snow falls for 14.7 days and typically aggregates up to 10.59" (269mm) of snow.

Daylight

December has the shortest days of the year, with an average of 8h and 54min of daylight.
On the first day of the month, sunrise is at 7:06 am and sunset at 4:09 pm. On the last day of December, sunrise is at 7:25 am and sunset at 4:18 pm PST.

Sunshine

In December, the average sunshine in Richland is 5.1h.

UV index

The average daily maximum UV index in December in Richland is 2. A UV Index value of 2, and less, symbolizes a low threat to health from exposure to the Sun's UV rays for ordinary individuals.
Note: In December, the maximum UV index of 2 suggests these recommendations:
While sun exposure does not greatly affect most, individuals with fair skin, babies, and children always need vigilant safeguarding. The solar radiation is most powerful near the mid-day, so the exposure to the direct Sun should be reduced accordingly. Prioritize a wide-brim hat for comprehensive sun defense for your face, neck, eyes, and ears. Stay alert! Snow's reflective properties can almost double the UV radiation from the Sun.
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Frequently asked questions

What is the coldest month in Richland?

Richland's coldest weather arrives in December, when temperatures average a high of 30.7°F (-0.7°C) and a low of 18.5°F (-7.5°C).

How cold is December in Richland?

In December, in Richland, the average high-temperature is 30.7°F (-0.7°C), and the average low-temperature is 18.5°F (-7.5°C). The average heat index (a.k.a. 'real feel', 'felt air temperature'), which takes the relative humidity and factors it into the air temperature reading, in August is estimated at 80.6°F (27°C).

What is the average humidity in December in Richland?

The average relative humidity in December in Richland is 86%.

What is the wettest month in Richland?

The month with the most rainfall in Richland, Oregon, is December, when the rain falls for 8.6 days and typically aggregates up to 1.77" (45mm) of precipitation.

How much does it rain in Richland in December?

In Richland, Oregon, during December, the rain falls for 8.6 days and regularly aggregates up to 1.77" (45mm) of precipitation.

What is the snowiest month in Richland?

The month with the most snowfall is December, when snow falls for 14.7 days and typically aggregates up to 10.59" (269mm) of snow.

How much does it snow in Richland in December?

In Richland, in December, during 14.7 snowfall days, 10.59" (269mm) of snow is typically accumulated.

What is the month with the shortest days in Richland?

December has the shortest days of the year in Richland, Oregon, with an average of 8h and 54min of daylight.

What is the average length of the day in December in Richland?

In Richland, Oregon, the average day length in December is 8h and 52min.

When is the sunrise / sunset in December in Richland?

On the first day of December in Richland, Oregon, sunrise is at 7:06 am and sunset at 4:09 pm. On the last day of the month, sunrise is at 7:25 am and sunset at 4:18 pm PST.

How long on average sun shines in December in Richland?

In December, the average sunshine duration in Richland is 5.1h.

How high is the UV index in December in Richland?

In December, the average daily maximum UV index in Richland, Oregon, is 2. A UV Index value of 2, and less, symbolizes a low health risk from unsafe exposure to Sun's UV rays.
Average humidity
Average rainfall days
Average snowfall days
Average daylight
Average sunshine
Average sunshine days
Average UV index
Average cloud cover
Average visibility

Average temperature in December
Richland, OR

Average temperature in December - Richland, OR
  • Average high temperature in December: 30.7°F

The warmest month (with the highest average high temperature) is July (81.7°F).
The month with the lowest average high temperature is December (30.7°F).

  • Average low temperature in December: 18.5°F

The month with the highest average low temperature is August (53.8°F).
The coldest month (with the lowest average low temperature) is December (18.5°F).

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Average pressure in December
Richland, OR

Average pressure in December - Richland, OR
  • Average pressure in December: 30.19"Hg

The month with the highest atmospheric pressure is January (30.22"Hg).
The month with the lowest atmospheric pressure is August (29.92"Hg).

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Average wind speed in December
Richland, OR

Average wind speed in December - Richland, OR
  • Average wind speed in December: 5.8mph

The windiest month (with the highest average wind speed) is April (6.2mph).
The calmest months (with the lowest average wind speed) are September and October (5.4mph).

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Average humidity in December
Richland, OR

Average humidity in December - Richland, OR
  • Average humidity in December: 86%

The month with the highest relative humidity is January (88%).
The month with the lowest relative humidity is August (40%).

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Average rainfall in December
Richland, OR

Average rainfall in December - Richland, OR
  • Average rainfall in December: 1.77"

The wettest month (with the highest rainfall) is December (1.77").
The driest month (with the least rainfall) is August (0.31").

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Average rainfall days in December
Richland, OR

Average rainfall days in December - Richland, OR
  • Average rainfall days in December: 8.6 days

The month with the highest number of rainy days is March (15.6 days).
The month with the least rainy days is August (4.4 days).

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Average snowfall in December
Richland, OR

Average snowfall in December - Richland, OR
  • Average snowfall in December: 10.59"

The month with the highest snowfall is December (10.59").
The months with the least snowfall are June, July, August and September (0").

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Average snowfall days in December
Richland, OR

Average snowfall days in December - Richland, OR
  • Average snowfall days in December: 14.7 days

The month with the highest number of snowfall days is December (14.7 days).
The months with the least snowfall days are June, July and August (0 days).

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Average daylight in December /
Average sunshine in December
Richland, OR

Average daylight in December / Average sunshine in December - Richland, OR
  • Average daylight in December: 8h and 5min

The month with the longest days is June (Average daylight: 15h and 30min).
The month with the shortest days is December (Average daylight: 8h and 54min).

  • Average sunshine in December: 5h and 1min

The month with the most sunshine is August (Average sunshine: 12h and 6min).
The month with the least sunshine is January (Average sunshine: 4h and 48min).

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Average sunshine days in December
Richland, OR

Average sunshine days in December - Richland, OR
  • Average sunshine days in December: 13.9 days

The month with the most sunshine days is July (22.7 days).
The months with the least sunshine days are February and March (11.3 days).

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Average UV index in December
Richland, OR

Average UV index in December - Richland, OR
  • Average UV index in December: 2

The month with the highest UV index is July (UV index 6).
The month with the lowest UV index is January (UV index 1).

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Average cloud cover in December
Richland, OR

Average cloud cover in December - Richland, OR
  • Average cloud cover in December: 47

The month with the most cloud cover is February (Cloud cover 50).
The months with the least cloud cover are July and August (Cloud cover 9).

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Average visibility in December
Richland, OR

Average visibility in December - Richland, OR
  • Average visibility in December: 4mi

The months with the highest visibility are April, May, June, July, August, September, October and November (6mi).
The months with the lowest visibility are January, February and December (4mi).

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Richland, Oregon, USA

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