December weather forecast
John Day, OR

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The iconic Painted Hills in the famous John Day Fossil Beds National Monument, Oregon
The iconic Painted Hills in the famous John Day Fossil Beds National Monument, Oregon

Weather in December

December in John Day, Oregon is characterized by a full-fledged winter. The weather element that makes this month exceptional is the most pronounced quantity of snowfall at 8.31" (211mm). The weather remains cold, often with freezing mornings and nights. This period offers many festive outdoor activities such as ice skating and snowball fights. Finally, the year ends with light winds and fluffy snow, bringing joy to holiday celebrations.

Temperature

With its high average temperature of 33.4°F (0.8°C) and a low of 19.6°F (-6.9°C), December is regarded as the coldest month.

Humidity

In December, the average relative humidity is 84%.

Rainfall

In December, in John Day, the rain falls for 11.1 days. Throughout December, 2.24" (57mm) of precipitation is accumulated. Throughout the year, there are 127.7 rainfall days, and 17.09" (434mm) of precipitation is accumulated.

Snowfall

January through May, September through December are months with snowfall. In John Day, during December, snow falls for 14.5 days and regularly aggregates up to 8.31" (211mm) of snow. In John Day, during the entire year, snow falls for 62.5 days and aggregates up to 39.17" (995mm) of snow.

Daylight

With an average of 8h and 54min of daylight, December has the shortest days of the year.
On the first day of December, sunrise is at 7:12 am and sunset at 4:17 pm. On the last day of the month, sunrise is at 7:31 am and sunset at 4:26 pm PST.

Sunshine

The average sunshine in December is 5.3h.

UV index

January through March, October through 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 low threat to health from unsafe exposure to UV radiation for average individuals.
Note: The daily high UV index of 2 in December translates into this advice:
Unlike children, who always need sun protection, most individuals can remain in the sun for up to an hour without getting burnt. Given the potency of the midday Sun's UV radiation, one should avoid prolonged exposure. Tightly woven clothing, when worn loosely, shields effectively against the Sun. Be careful! The Sun's UV radiation can nearly be doubled by the reflective quality of snow.

Frequently asked questions

What time of the year is the coldest?

December brings the lowest temperatures, with an average high of 33.4°F (0.8°C) and an average low of 19.6°F (-6.9°C).

How cold is it in John Day in December?

The average high-temperature and low-temperature during December are 33.4°F (0.8°C) and 19.6°F (-6.9°C) respectively. The average heat index (a.k.a. 'real feel', 'feels like'), which takes the relative humidity and factors it into the air temperature reading, in August is appraised at 80.6°F (27°C).

What is the average humidity in December?

In John Day, the average relative humidity in December is 84%.

How many days does it rain in December?

In John Day, in December, during 11.1 rainfall days, 2.24" (57mm) of precipitation is typically accumulated.

How much does it snow in John Day in December?

In John Day, in December, snow falls for 14.5 days, with typically accumulated 8.31" (211mm) of snow.

What is the month with the shortest days?

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

What is the average length of the day in December?

The average day length in December is 8h and 55min.

When are sunrise and sunset in December in John Day?

In December, on the first day of the month, sunrise is at 7:12 am and sunset at 4:17 pm. On the last day of the month, sunrise is at 7:31 am and sunset at 4:26 pm PST.

How many hours of sunshine does John Day have in December?

The average sunshine duration in December is 5.3h.

What are the months with the lowest UV index?

January through March, October through December, with an average maximum UV index of 2, are months with the lowest UV index.

What is the UV index intensity in December?

In John Day, the average daily maximum UV index in December is 2. A UV Index reading of 2, and below, represents a minimal health vulnerability 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
John Day, OR

Average temperature in December - John Day, OR
  • Average high temperature in December: 33.4°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 (33.4°F).

  • Average low temperature in December: 19.6°F

The month with the highest average low temperature is August (49.6°F).
The coldest month (with the lowest average low temperature) is December (19.6°F).

Average pressure in December
John Day, OR

Average pressure in December - John Day, 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 (29.93"Hg).

Average wind speed in December
John Day, OR

Average wind speed in December - John Day, 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 August and September (5mph).

Average humidity in December
John Day, OR

Average humidity in December - John Day, OR
  • Average humidity in December: 84%

The month with the highest relative humidity is February (85%).
The month with the lowest relative humidity is August (42%).

Average rainfall in December
John Day, OR

Average rainfall in December - John Day, OR
  • Average rainfall in December: 2.24"

The wettest month (with the highest rainfall) is February (2.28").
The driest month (with the least rainfall) is July (0.24").

Average rainfall days in December
John Day, OR

Average rainfall days in December - John Day, OR
  • Average rainfall days in December: 11.1 days

The month with the highest number of rainy days is March (17.3 days).
The month with the least rainy days is August (3.3 days).

Average snowfall in December
John Day, OR

Average snowfall in December - John Day, OR
  • Average snowfall in December: 8.31"

The month with the highest snowfall is February (10.31").
The months with the least snowfall are June, July and August (0").

Average snowfall days in December
John Day, OR

Average snowfall days in December - John Day, OR
  • Average snowfall days in December: 14.5 days

The month with the highest number of snowfall days is December (14.5 days).
The months with the least snowfall days are June, July and August (0 days).

Average daylight in December /
Average sunshine in December
John Day, OR

Average daylight in December / Average sunshine in December - John Day, 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 2min

The month with the most sunshine is August (Average sunshine: 12h and 6min).
The months with the least sunshine are January and February (Average sunshine: 5h and 12min).

Average sunshine days in December
John Day, OR

Average sunshine days in December - John Day, OR
  • Average sunshine days in December: 11.4 days

The month with the most sunshine days is July (24.9 days).
The month with the least sunshine days is February (9 days).

Average UV index in December
John Day, OR

Average UV index in December - John Day, OR
  • Average UV index in December: 2

The month with the highest UV index is July (UV index 6).
The months with the lowest UV index are January, February, March, October, November and December (UV index 2).

Average cloud cover in December
John Day, OR

Average cloud cover in December - John Day, OR
  • Average cloud cover in December: 47

The month with the most cloud cover is February (Cloud cover 49).
The months with the least cloud cover are July and August (Cloud cover 9).

Average visibility in December
John Day, OR

Average visibility in December - John Day, OR
  • Average visibility in December: 4mi

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

John Day, Oregon, USA

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