December weather forecast
Grangeville, ID

Weather in December

The first month of the winter, December, is still a cold month in Grangeville, Idaho, with temperature in the range of an average high of 33.6°F (0.9°C) and an average low of 21.7°F (-5.7°C).

Temperature

The coldest month is December, with an average high-temperature of 33.6°F (0.9°C) and an average low-temperature of 21.7°F (-5.7°C).

Humidity

In December, the average relative humidity in Grangeville is 87%.

Rainfall

In December, the rain falls for 9.1 days. Throughout December, 2.2" (56mm) of precipitation is accumulated. In Grangeville, during the entire year, the rain falls for 146.2 days and collects up to 23.35" (593mm) of precipitation.

Snowfall

January through May, September through December are months with snowfall in Grangeville. In December, in Grangeville, it is snowing for 16.9 days. Throughout December, 12.8" (325mm) of snow is accumulated. Throughout the year, in Grangeville, there are 80.3 snowfall days, and 60.47" (1536mm) of snow is accumulated.

Daylight

The month with the shortest days in Grangeville, Idaho, is December, with an average of 8h and 43min of daylight.
On the first day of December, sunrise is at 7:05 am and sunset at 4:01 pm. On the last day of the month, sunrise is at 7:26 am and sunset at 4:09 pm PST.

Sunshine

The average sunshine in December is 4.9h.

UV index

The average daily maximum UV index in December in Grangeville, Idaho, is 2. A UV Index reading of 2, and below, represents a low threat to health 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:
Most people can stay in the Sun for up to 1 hour without burning, apart from children that always must be protected from sun exposure. The solar radiation is most powerful near the mid-day, so the exposure to the direct Sun should be reduced accordingly. 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.
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FAQ

What is the coldest month in Grangeville?

With an average high-temperature of 33.6°F (0.9°C) and an average low-temperature of 21.7°F (-5.7°C), December is the coldest month in Grangeville, Idaho.

What is the temperature in December in Grangeville?

In December, in Grangeville, Idaho, the average high-temperature is 33.6°F (0.9°C), and the average low-temperature is 21.7°F (-5.7°C). The average heat index (a.k.a. 'felt air temperature', 'feels like'), which represents the influence of relative humidity on air temperature, in August is calculated to be 82.4°F (28°C).

What is the average humidity in December in Grangeville?

The average relative humidity in December is 87%.

How many days does it rain in December in Grangeville?

In Grangeville, in December, during 9.1 rainfall days, 2.2" (56mm) of precipitation is typically accumulated.

How much does it snow in Grangeville in December?

In Grangeville, Idaho, in December, snow falls for 16.9 days, with typically accumulated 12.8" (325mm) of snow.

What is the month with the shortest days in Grangeville?

With an average of 8h and 43min of daylight, December has the shortest days of the year in Grangeville.

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

In December, the average day length is 8h and 43min.

When is the sunrise / sunset in December in Grangeville?

In December, on the first day of the month, sunrise is at 7:05 am and sunset at 4:01 pm. On the last day of the month, in Grangeville, Idaho, sunrise is at 7:26 am and sunset at 4:09 pm PST.

How many hours of sunshine does Grangeville have in December?

In December, the average sunshine duration in Grangeville is 4.9h.

What is the UV index reading in December in Grangeville?

In Grangeville, the average daily maximum UV index in December is 2. A UV Index reading of 2, and below, represents a low health risk 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
Grangeville, ID

Average temperature in December - Grangeville, ID
  • Average high temperature in December: 33.6°F

The warmest month (with the highest average high temperature) is August (82.6°F).
The month with the lowest average high temperature is December (33.6°F).

  • Average low temperature in December: 21.7°F

The month with the highest average low temperature is August (53.2°F).
The coldest month (with the lowest average low temperature) is December (21.7°F).

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Average pressure in December
Grangeville, ID

Average pressure in December - Grangeville, ID
  • Average pressure in December: 30.19"Hg

The month with the highest atmospheric pressure is January (30.21"Hg).
The months with the lowest atmospheric pressure are June and August (29.94"Hg).

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Average wind speed in December
Grangeville, ID

Average wind speed in December - Grangeville, ID
  • Average wind speed in December: 4.8mph

The windiest months (with the highest average wind speed) are January and November (4.9mph).
The calmest month (with the lowest average wind speed) is August (3.8mph).

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Average humidity in December
Grangeville, ID

Average humidity in December - Grangeville, ID
  • Average humidity in December: 87%

The month with the highest relative humidity is January (88%).
The month with the lowest relative humidity is August (47%).

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Average rainfall in December
Grangeville, ID

Average rainfall in December - Grangeville, ID
  • Average rainfall in December: 2.2"

The wettest month (with the highest rainfall) is April (2.91").
The driest month (with the least rainfall) is July (0.59").

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Average rainfall days in December
Grangeville, ID

Average rainfall days in December - Grangeville, ID
  • Average rainfall days in December: 9.1 days

The month with the highest number of rainy days is April (19.3 days).
The month with the least rainy days is August (6.8 days).

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Average snowfall in December
Grangeville, ID

Average snowfall in December - Grangeville, ID
  • Average snowfall in December: 12.8"

The month with the highest snowfall is February (12.95").
The months with the least snowfall are June, July and August (0").

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Average snowfall days in December
Grangeville, ID

Average snowfall days in December - Grangeville, ID
  • Average snowfall days in December: 16.9 days

The month with the highest number of snowfall days is December (16.9 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
Grangeville, ID

Average daylight in December / Average sunshine in December - Grangeville, ID
  • Average daylight in December: 8h and 43min

The month with the longest days is June (Average daylight: 15h and 41min).
The month with the shortest days is December (Average daylight: 8h and 43min).

  • Average sunshine in December: 4h and 54min

The month with the most sunshine is August (Average sunshine: 11h and 54min).
The month with the least sunshine is January (Average sunshine: 4h and 48min).

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Average sunshine days in December
Grangeville, ID

Average sunshine days in December - Grangeville, ID
  • Average sunshine days in December: 11.5 days

The month with the most sunshine days is August (22.2 days).
The month with the least sunshine days is March (7.5 days).

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Average UV index in December
Grangeville, ID

Average UV index in December - Grangeville, ID
  • 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 February (UV index 1).

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Average cloud cover in December
Grangeville, ID

Average cloud cover in December - Grangeville, ID
  • Average cloud cover in December: 50

The month with the most cloud cover is February (Cloud cover 53).
The month with the least cloud cover is August (Cloud cover 13).

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Average visibility in December
Grangeville, ID

Average visibility in December - Grangeville, ID
  • Average visibility in December: 4mi

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

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