The Dalles
Oregon, USA
Long-term weather forecast
Long-term weather forecast

December weather forecast and climate
The Dalles, OR

December, the first month of the winter, in The Dalles, is also a wintry month, with average temperature ranging between max 42.1°F (5.6°C) and min 30°F (-1.1°C).

Temperature

In The Dalles, the average high-temperature in December marginally drops, from a fresh 50°F (10°C) in November, to a wintry 42.1°F (5.6°C). The average low-temperature, in The Dalles, is 30°F (-1.1°C).

Rainfall

The wettest months in The Dalles are January and December, with an average 2.6" (66mm) of rainfall.

Daylight

December has the shortest days of the year in The Dalles, Oregon, with an average of 8.8h of daylight.

Sunshine

December has the least sunshine of the year, with an average of 2h of sunshine.

UV index

January, November and December, with an average maximum UV index of 1, are months with the lowest UV index. A UV Index reading of 2, and below, represents a minimal health vulnerability from unsafe exposure to the UV radiation for ordinary individuals.
In December, the average maximum UV index of 1 translate into the following recommendations:
People with sensitive skin, children, and babies should always be protected from prolonged sun exposure. The solar radiation is most powerful near the mid-day, so the exposure to the direct Sun should be reduced accordingly. 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.

What is the temperature in December in The Dalles?

The average high-temperature, in December, in The Dalles, Oregon, is 42.1°F (5.6°C), while the average low-temperature is 30°F (-1.1°C).

How much does it rain in The Dalles in December?

In The Dalles, in December, it is raining for 14 days, with typically 2.6" (66mm) of accumulated precipitation.

What is the rainiest month in The Dalles?

Months with the most rainfall in The Dalles, Oregon, are January and December, with an average 2.6" (66mm) of precipitation.

What is the month with the shortest days in The Dalles?

The month with the shortest days in The Dalles is December, with an average of 8.8h of daylight.

How many hours of daylight does The Dalles have in December?

The average length of the day in December in The Dalles, Oregon, is 8.8h.

What is the month with the least sunshine in The Dalles?

The month with the least sunshine is December, with an average of 2h of sunshine.

How long on average sun shines in December in The Dalles?

The average sunshine in December is 2h.

What is the month with the lowest UV index in The Dalles?

January, November and December, with an average maximum UV index of 1, are months with the lowest UV index in The Dalles, Oregon.

What is the UV index intensity in December in The Dalles?

The average daily maximum UV index in December in The Dalles is 1. A UV Index reading of 2, and below, represents a low health threat from unsafe exposure to the Sun's UV rays.
Average temperature in December - The Dalles, OR
  • Average high temperature in December: 42°F

Warmest months (with the highest average high temperature) are July and August (88°F).
The month with the lowest average high temperature is January (41°F).

  • Average low temperature in December: 30°F

Months with the highest average low temperature are July and August (61°F).
Coldest months (with the lowest average low temperature) are January and December (30°F).

Average rainfall in December - The Dalles, OR
  • Average rainfall in December: 2.6"

Wettest months (with the highest rainfall) are January and December (2.6").
The driest month (with the lowest rainfall) is July (0.2").

Average rainfall days in December - The Dalles, OR
  • Average rainfall days in December: 14 days

The month with the highest number of rainy days is December (14 days).
The month with the lowest number of rainy days is July (3 days).

Average daylight in December / Average sunshine in December - The Dalles, OR
  • Average daylight in December: 8.8h

The month with the longest days is June (Average daylight: 15.6h).
The month with shortest days is December (Average daylight: 8.8h).

  • Average sunshine in December: 2h

The month with most sunshine is July (Average sunshine: 12h).
The month with least sunshine is December (Average sunshine: 2h).

Average UV index in December - The Dalles, OR
  • Average UV index in December: 1

The month with the highest UV index is July (UV index 8).
Months with the lowest UV index are January, November and December (UV index 1).