December weather forecast
John Day, OR

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, the first month of the winter in John Day, is still a cold month, with an average temperature varying between 33.4°F (0.8°C) and 19.6°F (-6.9°C).

Temperature

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

Humidity

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

Rainfall

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

Snowfall

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

Daylight

December has the shortest days of the year in John Day, with an average of 8h and 55min of daylight.
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

In John Day, the average sunshine in December is 5.3h.

UV index

The months with the lowest UV index in John Day, Oregon, are January through March, October through December, with an average maximum UV index of 2. A UV Index estimate of 2, and below, represents a minimal health vulnerability from unprotected exposure to Sun's UV rays for the average person.
Note: The average daily UV index of 2 in December transform into the following instructions:
For the majority, extended sun exposure is not of great concern. Infants and people with sensitive skin must always be protected. The Sun's most intense and consequently most harmful UV radiation during midday hours should be decreased by minimizing exposure and seeking shade. Sun-protective clothing, a long-sleeved shirt and pants, a wide-brimmed hat, and UVA and UVB-blocking sunglasses are particularly helpful in blocking UV radiation's harmful effects. Caution! The reflection of snow can nearly double the intensity of the Sun's UV radiation.
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FAQ

What is the coldest month in John Day?

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

What is the average humidity in December in John Day?

The average relative humidity in December in John Day, Oregon, is 84%.

How much does it rain in John Day in December?

In John Day, Oregon, during December, the rain falls for 11.1 days and regularly aggregates up to 2.24" (57mm) of precipitation.

How much does it snow in John Day in December?

In December, it is snowing for 14.5 days. Throughout December, 8.31" (211mm) of snow is accumulated.

What is the month with the shortest days in John Day?

The month with the shortest days in John Day is December, with an average of 8h and 55min of daylight.

What is the average length of the day in December in John Day?

The average day length in December in John Day, Oregon, is 8h and 55min.

What time 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 long on average sun shines in December in John Day?

In John Day, the average sunshine duration in December is 5.3h.

When is the lowest UV index in John Day?

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

What is the UV index reading in December in John Day?

In December, the average daily maximum UV index in John Day, Oregon, is 2. A UV Index reading of 2, and below, represents 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).

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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).

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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).

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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%).

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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").

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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).

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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").

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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).

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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 55min

The month with the longest days is June (Average daylight: 15h and 29min).
The month with the shortest days is December (Average daylight: 8h and 55min).

  • Average sunshine in December: 5h and 18min

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).

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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).

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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).

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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).

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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).

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