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

The coldest time of the year is December, with temperatures averaging a high of 33.4°F (0.8°C) and a low of 19.6°F (-6.9°C).

Humidity

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

Rainfall

In December, the rain falls for 11.1 days. Throughout December, 2.24" (57mm) of precipitation is accumulated. In John Day, during the entire year, the rain falls for 127.7 days and collects up to 17.09" (434mm) of precipitation.

Snowfall

January through May, September through December are months with snowfall. In John Day, in December, during 14.5 snowfall days, 8.31" (211mm) of snow is typically accumulated. Throughout the year, there are 62.5 snowfall days, and 39.17" (995mm) of snow is accumulated.

Daylight

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

Sunshine

In December, the average sunshine is 5.3h.

UV index

The months with the lowest UV index are January through March, October through December, with an average maximum UV index of 2. A UV Index of 2, and less, symbolizes a low threat to health from unprotected exposure to Sun's UV rays for the ordinary person.
Note: The maximum UV index, 2 during December, leads to the following recommendations:
Although the majority can endure up to an hour in the sun without burns, children always require sun protection. The solar radiation is most powerful near the mid-day, so the exposure to the direct Sun should be reduced accordingly. Wearing sunglasses with both UVA and UVB protection effectively reduces sun-induced eye damage. Take precaution! The reflection from snow can almost double the UV radiation of the Sun.
Updated: Jul 26, 2024
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate

Frequently asked questions

What is the coldest month in John Day?

December, with average temperatures reaching a high of 33.4°F (0.8°C) and a low of 19.6°F (-6.9°C), is the coldest month.

How cold is it in John Day in December?

An average high-temperature, in December, in John Day, is 33.4°F (0.8°C) and the average low-temperature is 19.6°F (-6.9°C). The average heat index (a.k.a. 'real feel', 'feels like'), which calculates the temperature value influenced by the moisture in the air, in August is computed to be 80.6°F (27°C).

What is the average humidity in December?

The average relative humidity in December is 84%.

How many days does it rain in December in John Day?

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

How many days does it snow in December?

In John Day, during December, snow falls for 14.5 days and regularly aggregates up to 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?

In December, the average day length is 8h and 55min.

When is the sunrise / sunset in December?

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.

How long on average sun shines in December?

In December, the average sunshine duration 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?

In December, the average daily maximum UV index is 2. A UV Index of 2, and less, symbolizes a minimal hazard to health 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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