December weather forecast
Granite, OR

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Weather in December

December, the first month of the winter in Granite, is still a freezing cold month, with an average temperature fluctuating between 18.5°F (-7.5°C) and 30.7°F (-0.7°C).

Temperature

Granite's December weather, marked by an average high temperature of 30.7°F (-0.7°C) and an average low temperature of 18.5°F (-7.5°C), is the coldest in the year.

Humidity

In Granite, the average relative humidity in December is 86%.

Rainfall

December is the month with the most rainfall. Rain falls for 8.6 days and accumulates 1.77" (45mm) of precipitation.

Snowfall

Months with snowfall are January through May, October through December. December is the month with the most snowfall. Snow falls for 14.7 days and accumulates 10.59" (269mm) of snow.

Daylight

The month with the shortest days is December, with an average of 8h and 54min of daylight.
On the first day of the month, sunrise is at 7:11 am and sunset at 4:14 pm. On the last day of December, sunrise is at 7:31 am and sunset at 4:22 pm PST.

Sunshine

In Granite, the average sunshine in December is 5.1h.

UV index

The average daily maximum UV index in December is 2. A UV Index estimate of 2, and below, represents a low threat to health from exposure to the Sun's UV rays for the ordinary person.
Note: A typical high UV index of 2 in December suggests the following recommendations:
Long-term sun exposure is typically not a concern for most. However, those with sensitive skin, infants, and children must always have protection. UV radiation is strongest from the Sun during midday; protect yourself by staying in shaded areas. On bright days sunglasses that block both UVA and UVB rays should be worn. A hat with a wide brim is extremely helpful, as it can prevent roughly 50% of UV radiation from reaching the eyes. Caution! The reflection of snow can nearly double the intensity of the Sun's UV radiation.
Updated: Jul 22, 2024
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate

Frequently asked questions

What is the coldest month?

December is the month when Granite, Oregon, experiences its coldest temperatures, averaging a high of 30.7°F (-0.7°C) and a low of 18.5°F (-7.5°C).

How cold is December?

Granite in December has an average high-temperature of 30.7°F (-0.7°C) and an average low-temperature of 18.5°F (-7.5°C). The average heat index (a.k.a. 'felt air temperature', 'feels like'), which factors the actual air temperature with the relative humidity, in August is evaluated at 80.6°F (27°C).

What is the average humidity in December?

In Granite, the average relative humidity in December is 86%.

What is the wettest month?

December is the month with the most rainfall. Rain falls for 8.6 days and accumulates 1.77" (45mm) of precipitation.

How many days does it rain in December?

In December, the rain falls for 8.6 days. Throughout December, 1.77" (45mm) of precipitation is accumulated.

When does it snow the most?

December is the month with the most snowfall. Snow falls for 14.7 days and accumulates 10.59" (269mm) of snow.

How many days does it snow in December?

In Granite, during December, snow falls for 14.7 days and regularly aggregates up to 10.59" (269mm) 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.

How many hours of daylight does Granite have in December?

In December, the average day length is 8h and 52min.

When are sunrise and sunset in December?

In December, on the first day of the month, sunrise is at 7:11 am and sunset at 4:14 pm. On the last day of the month, sunrise is at 7:31 am and sunset at 4:22 pm PST.

How long on average sun shines in December?

The average sunshine duration in December in Granite is 5.1h.

What is the UV index intensity in December?

In Granite, the average daily maximum UV index in December is 2. A UV Index reading of 2, and below, represents a low health threat from unprotected exposure to UV radiation.
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
Granite, OR

Average temperature in December - Granite, OR
  • Average high temperature in December: 30.7°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 (30.7°F).

  • Average low temperature in December: 18.5°F

The month with the highest average low temperature is August (53.8°F).
The coldest month (with the lowest average low temperature) is December (18.5°F).

Average pressure in December
Granite, OR

Average pressure in December - Granite, 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 (29.92"Hg).

Average wind speed in December
Granite, OR

Average wind speed in December - Granite, 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 September and October (5.4mph).

Average humidity in December
Granite, OR

Average humidity in December - Granite, OR
  • Average humidity in December: 86%

The month with the highest relative humidity is January (88%).
The month with the lowest relative humidity is August (40%).

Average rainfall in December
Granite, OR

Average rainfall in December - Granite, OR
  • Average rainfall in December: 1.77"

The wettest month (with the highest rainfall) is December (1.77").
The driest month (with the least rainfall) is August (0.31").

Average rainfall days in December
Granite, OR

Average rainfall days in December - Granite, OR
  • Average rainfall days in December: 8.6 days

The month with the highest number of rainy days is March (15.6 days).
The month with the least rainy days is August (4.4 days).

Average snowfall in December
Granite, OR

Average snowfall in December - Granite, OR
  • Average snowfall in December: 10.59"

The month with the highest snowfall is December (10.59").
The months with the least snowfall are June, July, August and September (0").

Average snowfall days in December
Granite, OR

Average snowfall days in December - Granite, OR
  • Average snowfall days in December: 14.7 days

The month with the highest number of snowfall days is December (14.7 days).
The months with the least snowfall days are June, July and August (0 days).

Average daylight in December /
Average sunshine in December
Granite, OR

Average daylight in December / Average sunshine in December - Granite, 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 1min

The month with the most sunshine is August (Average sunshine: 12h and 6min).
The month with the least sunshine is January (Average sunshine: 4h and 48min).

Average sunshine days in December
Granite, OR

Average sunshine days in December - Granite, OR
  • Average sunshine days in December: 13.9 days

The month with the most sunshine days is July (22.7 days).
The months with the least sunshine days are February and March (11.3 days).

Average UV index in December
Granite, OR

Average UV index in December - Granite, OR
  • Average UV index in December: 2

The month with the highest UV index is July (UV index 6).
The month with the lowest UV index is January (UV index 1).

Average cloud cover in December
Granite, OR

Average cloud cover in December - Granite, OR
  • Average cloud cover in December: 47

The month with the most cloud cover is February (Cloud cover 50).
The months with the least cloud cover are July and August (Cloud cover 9).

Average visibility in December
Granite, OR

Average visibility in December - Granite, OR
  • Average visibility in December: 4mi

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

Granite, Oregon, USA

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