Hermiston
Oregon, USA
Long-term weather forecast
Long-term weather forecast

December weather forecast and climate
Hermiston, OR

The first month of the winter, December, is still a cold month in Hermiston, Oregon, with average temperature fluctuating between 41.7°F (5.4°C) and 26.4°F (-3.1°C).

Temperature

In December, the average high-temperature drops, from a fresh 50.7°F (10.4°C) in November, to a cold 41.7°F (5.4°C). The average low-temperature, in December, is 26.4°F (-3.1°C).

Rainfall

Months with the most rainfall are January and December, with an average 1.2" (31mm) of precipitation.

Snowfall

January through March, November and December are months with snowfall. During December, Hermiston regularly aggregates up to 2.4" (61mm) of snow. In Hermiston, during the entire year, snow aggregates up to 11.2" (284.6mm).

Daylight

December has the shortest days of the year in Hermiston, Oregon, with an average of 8.7h of daylight.

What is the temperature in December in Hermiston?

In Hermiston, in December, the average high-temperature is 41.7°F (5.4°C), and the average low-temperature is 26.4°F (-3.1°C).

How many days does it rain in December in Hermiston?

In December, in Hermiston, the rain falls for 11 days. Throughout December, 1.2" (31mm) of precipitation is accumulated.

What is the rainiest month in Hermiston?

The wettest months in Hermiston, Oregon, are January and December, with an average 1.2" (31mm) of rainfall.

How much does it snow in Hermiston in December?

Throughout December, in Hermiston, 2.4" (61mm) of snow is accumulated.

What is the month with the shortest days in Hermiston?

December has the shortest days of the year, with an average of 8.7h of daylight.

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

The average length of the day in December is 8.7h.
Average temperature in December - Hermiston, OR
  • Average high temperature in December: 41.8°F

The warmest month (with the highest average high temperature) is July (90.4°F).
The month with the lowest average high temperature is January (39.9°F).

  • Average low temperature in December: 26.5°F

The month with the highest average low temperature is July (57.1°F).
The coldest month (with the lowest average low temperature) is January (23.6°F).

Average rainfall in December - Hermiston, OR
  • Average rainfall in December: 1.2"

Wettest months (with the highest rainfall) are January, November and December (1.2").
The driest month (with the lowest rainfall) is July (0.2").

Average rainfall days in December - Hermiston, OR
  • Average rainfall days in December: 11 days

The month with the highest number of rainy days is December (11 days).
Months with the lowest number of rainy days are July and August (2 days).

Average snowfall in December - Hermiston, OR
  • Average snowfall in December: 2.4"

The month with the highest snowfall is January (5").
Months with the lowest snowfall are April, May, June, July, August, September and October (0").

Average daylight in December - Hermiston, OR
  • Average daylight in December: 8.7h

The month with the longest days is June (Average daylight: 15.7h).
The month with shortest days is December (Average daylight: 8.7h).